Service

Workshop Manual
Audi A4 2008 ➤
Electrical system
Edition 12.2009

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Service Department. Technical Information

 Service
List of Workshop Manual Repair GroupsList of Workshop Manual
Repair GroupsList of Workshop Manual Repair Groups

Repair Group
27 - Starter, current supply, CCS
90 - Gauges, instruments
92 - Windscreen wash/wipe system
94 - Lights, bulbs, switches - exterior
96 - Lights, bulbs, switches - interior
97 - Wiring

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Technical information should always be available to the foremen and mechanics, because their
careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and
safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a
matter of course, be observed.

All rights reserved.

No reproduction without prior agreement from publisher.

Copyright © 2010 Audi AG, Ingolstadt A005A401420

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Contents

27 - Starter, current supply, CCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1 Contact corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1 Battery - general notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2 Maintenance-free batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.3 Exploded view of battery - saloon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.4 Exploded view of battery -Protected Avantby copyright.
. . . . . .Copying
. . . . for
. .private
. . . or. .commercial
. . . . . .purposes,
. . . . . in. part
. . .or. in. whole,
. . . .is.not
..... 4
2.5 Disconnecting and connecting permittedbattery . . . . by
unless authorised . .AUDI
. . .AG.
. . AUDI
. . . AG
. . does
. . .not
. .guarantee
. . . . . or. .accept
. . . any
. . liability
....... 5
2.6 Removing and installing earth cable with battery monitor control unit J367 . . . . . . . . . . . . 7
with respect to the correctness of information in this document. Copyright by AUDI AG.

2.7 Removing and installing battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.8 Checking battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9 Charging battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.10 Preparations before charging battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.11 Preparations for back-up power supply of battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.12 Removing and installing battery isolation igniter N253 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Start/stop system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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3.1 Safety precautions for vehicles with start/stop system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Exploded view of start/stop system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3 Removing and installing voltage stabiliser J532 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Exploded view of alternator without sliding bushes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Removing and installing alternator - vehicles with 1.8 ltr. and 2.0 ltr. TFSI engine . . . . . . 18
4.3 Removing and installing alternator - vehicles with 3.0 ltr. TFSI and 3.2 ltr. FSI engine . . . . 20
4.4 Exploded view of alternator with sliding bushes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.5 Removing and installing alternator - vehicles with 2.0 ltr. TDI engine . . . . . . . . . . . . . . . . 23
4.6 Removing and installing alternator - vehicles with 2.7 ltr. and 3.0 ltr. TDI engine without
auxiliary heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.7 Removing and installing alternator - vehicles with 2.7 ltr. and 3.0 ltr. TDI engine with auxiliary
heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.8 Removing and installing alternator - vehicles with 2.7 ltr. and 3.0 ltr. TDI engine with dual
clutch gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5 Checking and servicing alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.1 Checking alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.2 Servicing alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6 Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1 Exploded view of starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.2 Removing and installing starter - vehicles with 1.8 ltr. and 2.0 ltr. TFSI engine . . . . . . . . . . 45
6.3 Removing and installing starter - vehicles with 3.0 ltr. TFSI and 3.2 ltr. FSI engine . . . . . . 46
6.4 Removing and installing starter - vehicles with 2.0 ltr. TDI engine . . . . . . . . . . . . . . . . . . . . 48
6.5 Removing and installing starter - vehicles with 2.7 ltr. and 3.0 ltr. TDI engine . . . . . . . . . . 50
6.6 Removing and installing starter - vehicles with 2.7 ltr. and 3.0 ltr. TDI engine with dual clutch
gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7 Cruise control system (CCS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

90 - Gauges, instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
1 Contact corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2 Instrument cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2.1 Exploded view of instrument cluster and radio-controlled clock receiver . . . . . . . . . . . . . . 55
2.2 Removing and installing instrument cluster with control unit in dash panel insert J285 . . 56
2.3 Pin assignment at multi-pin connector on instrument cluster . . . . . . . . . . . . . . . . . . . . . . . . 58
2.4 Pin assignment at fuel gauge sender G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.5 Pin assignment at fuel gauge sender 2 G169 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.6 Pin assignment at coolant temperature sender G62 - FSI engines . . . . . . . . . . . . . . . . . . 59

Contents i
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.7 Pin assignment at coolant temperature senders G62 / G83 - TDI engines . . . . . . . . . . . . 60
2.8 Removing and installing ambient temperature sensor G17 . . . . . . . . . . . . . . . . . . . . . . . . 60
2.9 Removing and installing radio-controlled clock receiver J489 . . . . . . . . . . . . . . . . . . . . . . 61
3 Cigarette lighter, electric socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3.1 Exploded view of cigarette lighter, 12 V socket and 230 V socket . . . . . . . . . . . . . . . . . . . . 62
3.2 Removing and installing cigarette lighter illumination bulb L28 . . . . . . . . . . . . . . . . . . . . . . 63
3.3 Removing and installing cigarette lighter U1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.4 Removing and installing socket illumination bulb L42 ( 12 V socket U5 ) . . . . . . . . . . . . . . 65
3.5 Removing and installing 12 V socket 2 U18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
3.6 Removing and installing socket illumination bulb L42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
3.7 Removing and installing AC/DC converter with socket, 12 V - 230 V U13 . . . . . . . . . . . . 69
3.8 Removing and installing 12 V socket 3 U19 - saloon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
3.9 Removing and installing 12 V socket 3 U19 - Avant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3.10 Renewing 12 V socket 3 U19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4 Horns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.1 Exploded view of horns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.2 Removing and installing horns H2 / H7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
5 Data bus diagnostic interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
5.1 Exploded view of data bus diagnostic interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

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5.2 Data bus diagnostic interface J533 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
5.3 Removing and installing data bus diagnostic interface J533 . . . . . . . . . . . . . . . . . . . . . . . . 74
5.4 Connector at data bus diagnostic interface J533 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

92 - Windscreen wash/wipe system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

1 Contact corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
2 Overview of windscreen wiper and washer system / headlight washer system . . . . . . . . . . 79
3 Windscreen wiper system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3.1 Exploded view of windscreen wiper system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3.2 Moving windscreen wipers to service position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3.3 Renewing wiper blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
3.4 Removing and installing wiper arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
3.5 Adjusting wiper arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
3.6 Removing and installing wiper motor V with wiper motor control unit J400 . . . . . . . . . . . . 84
3.7 Renewing wiper motor V with wiper motor control unit J400 . . . . . . . . . . . . . . . . . . . . . . . . 86
4 Windscreen washer system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
4.1 Exploded view of washer fluid reservoir, washer fluid hoses, washer jets . . . . . . . . . . . . . . 87
4.2 Removing and installing filler neck for washer fluid reservoir . . . . . . . . . . . . . . . . . . . . . . . . 88
4.3 Removing and installing washer fluid reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4.4 Removing and installing washer fluid level sender G33 . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.5 Removing and installing washer pump V5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
4.6 Removing and installing washer jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
4.7 Adjusting washer jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
5 Overview of rear window wiper and washer system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
6 Rear window wiper and washer system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
6.1 Exploded view of rear window wiper and rear window wiper motor . . . . . . . . . . . . . . . . . . 95
6.2 Renewing wiper blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
6.3 Removing and installing wiper arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
6.4 Adjusting wiper arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
6.5 Removing and installing rear window wiper motor V12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
6.6
ProtectedRemoving and installing
by copyright. Copying rubber seal
for private or commercial purposes,. in
. .part
. .or. in. whole,
. . . . is. not
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
6.7 with respect
Exploded view of washer fluid reservoir, washer
to the correctness of information in this document. Copyright by AUDI AG.fluid hoses, washer jets . . . . . . . . . . . . . . 98
6.8 Removing and installing washer pump V5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
6.9 Removing and installing washer jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
6.10 Adjusting washer jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

ii Contents
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.11 Removing and installing washer fluid reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

7 Headlight washer system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
7.1 Exploded view of washer fluid reservoir, washer fluid hoses, washer jets . . . . . . . . . . . . . . 102
7.2 Removing and installing headlight washer system pump V11 . . . . . . . . . . . . . . . . . . . . . . 102
7.3 Removing and installing headlight washer jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
7.4 Adjusting washer jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
7.5 Removing and installing washer fluid reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
8 Washer fluid hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

94 - Lights, bulbs, switches - exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

1 Contact corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
2 Halogen headlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
2.1 Exploded view of halogen headlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
2.2 Removing and installing headlight housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
2.3 Removing and installing mounting for headlight housing . . . . . . . . . . . . . . . . . . . . . . . . . . 112
2.4 Renewing headlight dipped beam bulb M29 / M31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
2.5 Renewing headlight main beam bulb M30 / M32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
2.6 Protected
Renewing daytime running light bulb (front) L174 / L175 . . . . . . . . . . . . . . . . . . . . . . . . . .
by copyright. Copying for private or commercial purposes, in part or in whole, is not
114
2.7 permitted
Renewing side light bulbAG.M1AUDI/AGM3 . . guarantee
. . . . . .or. accept
. . . . any
. . liability
............................. 115

cardiagn.com
unless authorised by AUDI does not
2.8 Renewing front side marker light bulb M33 / M34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
with respect to the correctness of information in this document. Copyright by AUDI AG.
117
2.9 Renewing front turn signal bulb M5 / M7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
2.10 Removing and installing left headlight range control motor V48 . . . . . . . . . . . . . . . . . . . . 118
2.11 Removing and installing right headlight range control motor V49 . . . . . . . . . . . . . . . . . . . . 120
2.12 Adjusting headlights from right-hand traffic to left-hand traffic . . . . . . . . . . . . . . . . . . . . . . 120
2.13 Adjusting headlights from left-hand traffic to right-hand traffic . . . . . . . . . . . . . . . . . . . . . . 121
3 Bi-xenon gas discharge headlights with adaptive light . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
3.1 Safety precautions when handling gas discharge bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . 123
3.2 Exploded view of bi-xenon gas discharge headlight with adaptive light . . . . . . . . . . . . . . . . 123
3.3 Removing and installing headlight housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
3.4 Removing and installing mounting for headlight housing . . . . . . . . . . . . . . . . . . . . . . . . . . 128
3.5 Renewing gas discharge bulb L13 / L14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
3.6 Renewing LED module for daytime running light and side light L176 / L177 . . . . . . . . . . 129
3.7 Renewing front side marker light bulb M33 / M34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
3.8 Removing and installing dip beam screen V294 / V295 . . . . . . . . . . . . . . . . . . . . . . . . . . 130
3.9 Renewing front turn signal bulb M5 / M7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
3.10 Removing and installing left/right gas discharge bulb control unit J343 / J344 . . . . . . . . . . 130
3.11 Removing and installing LED module for daytime running lights and side lights L176 / L177
...................................................................... 131
3.12 Removing and installing output module for headlight J667 / J668 . . . . . . . . . . . . . . . . . . 132
3.13 Removing and installing dynamic cornering light control motor V318 / V319 . . . . . . . . . . 133
3.14 Removing and installing headlight range control motor V48 / V49 . . . . . . . . . . . . . . . . . . 133
3.15 Converting headlights for driving on the left or right side of the road . . . . . . . . . . . . . . . . . . 135
4 Automatic headlight range control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
4.1 Overview of automatic headlight range control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
4.2 Removing and installing control unit J431 , J745 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
5 Fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
5.1 Exploded view of fog light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
5.2 Removing and installing fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
5.3 Renewing fog light bulb L22 / L23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
6 Checking and adjusting headlight settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
6.1 Requirements for checking and adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
6.2 Adjusting headlights - rest-of-the-world vehicles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
6.3 Adjusting headlights - USA vehicles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
6.4 Adjusting fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
6.5 Adjusting additional headlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Contents iii
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7 Turn signal repeaters - vehicles up to 05.2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

7.1 Exploded view of exterior mirror turn signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
7.2 Removing and installing exterior mirror turn signal bulb L131 / L132 . . . . . . . . . . . . . . . . 146
8 Turn signal repeaters - vehicles from 06.2009 onwards . . . . . . . . . . . . . . . . . . . . . . . . . . 148
8.1 Exploded view of exterior mirror turn signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
8.2 Removing and installing exterior mirror turn signal bulb L131 / L132 . . . . . . . . . . . . . . . . 149
9 Tail lights - saloon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.1 Exploded view of outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.2 Removing and installing outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.3 Removing and installing bulb holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.4 Renewing rear side marker light bulb M37 / M38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.5 Exploded view of inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
9.6 Removing and installing inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
9.7 Removing and installing bulb holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
10 LED tail lights - saloon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
10.1 Exploded view of outer tail light cluster - rest-of-the-world vehicles . . . . . . . . . . . . . . . . . . 157
10.2 Removing and installing outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
10.3 Removing and installing bulb holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

cardiagn.com
10.4 Exploded view of inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
10.5 Removing and installing inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
10.6 Removing and installing rear fog light bulb L46 / L47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
10.7 Removing and installing reversing light bulb M16 / M17 . . . . . . . . . . . . . . . . . . . . . . . . . . 161
11 Tail lights - Avant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
11.1 Exploded view of outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
11.2 Removing and installing outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
11.3 Removing and installing bulb holder
Protected by copyright. . .private
Copying for . . . .or.commercial
. . . . . . purposes,
. . . . . .in .part
. . or. in. .whole,
. . . is. not
............. 164
11.4 Renewing rear side marker
permitted light bulb
unless authorised M37AG./ AUDI
by AUDI M38AG does . . .not
. .guarantee
. . . . . or. .accept
. . . .any . .liability
.............. 164
with respect to the correctness of information in this document. Copyright by AUDI AG.
11.5 Exploded view of inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
11.6 Removing and installing inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
11.7 Removing and installing bulb holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
12 LED tail lights - Avant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
12.1 Exploded view of outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
12.2 Removing and installing outer tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
12.3 Removing and installing bulb holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
12.4 Renewing rear side marker light bulb M37 / M38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
12.5 Exploded view of inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
12.6 Removing and installing inner tail light cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
12.7 Removing and installing rear fog light bulb L46 / L47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
13 Exterior lights (rear) - saloon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
13.1 Exploded view of high-level brake light and number plate light . . . . . . . . . . . . . . . . . . . . . . 173
13.2 Removing and installing high-level brake light bulb M25 . . . . . . . . . . . . . . . . . . . . . . . . . . 174
13.3 Removing and installing number plate light X4 / X5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
14 Exterior lights (rear) - Avant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
14.1 Exploded view of high-level brake light and number plate light . . . . . . . . . . . . . . . . . . . . . . 175
14.2 Removing and installing high-level brake light bulb M25 . . . . . . . . . . . . . . . . . . . . . . . . . . 175
14.3 Preparing high-level brake light for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
14.4 Removing and installing number plate light X4 / X5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
15 Steering column switch module and electronic ignition lock . . . . . . . . . . . . . . . . . . . . . . . . 178
15.1 Exploded view of steering column switch module, electronic ignition lock . . . . . . . . . . . . . . 178
15.2 Removing and installing steering column switch module . . . . . . . . . . . . . . . . . . . . . . . . . . 179
15.3 Removing and installing steering column electronics control unit J527 . . . . . . . . . . . . . . 179
15.4 Pin assignment on steering column electronics control unit J527 . . . . . . . . . . . . . . . . . . . . 181
15.5 Removing and installing turn signal switch E2 , cruise control system switch E45 , intermittent
wiper switch E22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

iv Contents
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

15.6 Removing and installing entry and start authorisation switch E415 . . . . . . . . . . . . . . . . . . 184
15.7 Pin assignment at entry and start authorisation switch E415 . . . . . . . . . . . . . . . . . . . . . . 186
16 Parking aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
16.1 Overview of parking aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
16.2 Removing and installing parking aid control unit J446 - vehicles without towing bracket . . 188
16.3 Removing and installing parking aid control unit J446 - vehicles with towing bracket . . . . 189
16.4 Removing and installing front parking aid warning buzzer H22 - 8-channel parking aid . . 190
16.5 Removing and installing rear parking aid warning buzzer H15 . . . . . . . . . . . . . . . . . . . . . . 190
16.6 Removing and installing front parking aid senders G252 / G253 / G254 / G255 - saloon and
Avant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
16.7 Removing and installing front parking aid senders G252 / G253 / G254 / G255 - allroad . . 191
16.8 Removing and installing rear parking aid senders G203 / G204 / G205 / G206 . . . . . . . . 192

96 - Lights, bulbs, switches - interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

1 Contact corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
2 Lights and switches in dash panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
2.1 Overview of lights and switches in dash panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
2.2 Removing and installing dash panel vent illumination bulb (left and right) L67 / L69 . . . . 196
2.3 Removing and installing switch and instrument illumination regulator E20 . . . . . . . . . . . . 196

cardiagn.com
2.4 Removing and installing rear fog light button E314 , fog light button E315 . . . . . . . . . . . . 196
2.5 Removing and installing light switch E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
2.6 Removing and installing headlight range control regulator E102 . . . . . . . . . . . . . . . . . . . . 198
2.7 Removing and installing hazard warning lights button E229 . . . . . . . . . . . . . . . . . . . . . . . . 198
2.8 Removing and installing warning lamp for airbag deactivated on front passenger side K145
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
2.9 Removing and installing switch panel in dash panel - vehicles equipped with MMI
convenience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
2.10 Removing and installing heated driver seat regulator E94 / heated front passenger seat
regulator E95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
2.11 Removing and installing Valet parkingProtected buttonbyE536 copyright. .Copying
. . . . for
. .private
. . . .or.commercial
. . . . . . purposes,
. . . . . .in .part
. . or. in. .whole,
200is not
2.12 Removing and installing glove compartment light W6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
2.13 Removing and installing glove compartment light switch E26 . . . . . . . . . . . . . . . . . . . . . . 202
2.14 Removing and installing front left footwell illumination bulb L151 / front right footwell
illumination bulb L152 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
3 Lights and switches in front doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
3.1 Overview of lights and switches in front doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
3.2 Removing and installing mirror adjustment switch E43 / E168 . . . . . . . . . . . . . . . . . . . . . . 204
3.3 Removing and installing window regulator switches E512 / E107 . . . . . . . . . . . . . . . . . . 205
3.4 Removing and installing driver side interior locking switch E150 / front passenger side interior
locking switch E198 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
3.5 Removing and installing driver seat memory operating unit E97 . . . . . . . . . . . . . . . . . . . . 206
3.6 Removing and installing rear lid remote release switch E188 . . . . . . . . . . . . . . . . . . . . . . 206
3.7 Removing and installing door opener illumination bulb L108 / L109 . . . . . . . . . . . . . . . . . . 207
3.8 Removing and installing central locking deadlock function warning lamp -SAFE- K133 . . 207
3.9 Removing and installing door contact switch F2 / F3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
3.10 Removing and installing front entry light W31 / W32 and door warning lamp W30 / W36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
4 Lights and switches in rear doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
4.1 Overview of lights and switches in rear doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
4.2 Removing and installing window regulator switches E52 / E54 . . . . . . . . . . . . . . . . . . . . 211
4.3 Removing and installing rear left interior locking switch E273 / rear right interior locking switch
E274 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
4.4 Removing and installing door opener illumination bulb L110 / L111 . . . . . . . . . . . . . . . . . . 212
4.5 Removing and installing door contact switch (rear) F10 / F11 . . . . . . . . . . . . . . . . . . . . . . 212
4.6 Removing and installing rear entry light W33 / W34 and rear door warning lamp W37 / W38
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
5 Lights and switches in centre console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

Contents v
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5.1 Overview of lights and switches in centre console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

5.2 Removing and installing electromechanical parking brake button E538 , auto-hold button
E540 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
5.3 Removing and installing entry and start authorisation button E408 . . . . . . . . . . . . . . . . . . 215
5.4 Removing and installing start/stop operation button E693 . . . . . . . . . . . . . . . . . . . . . . . . 216
5.5 Removing and installing selector lever position display Y26 with selector lever display
illumination bulb L101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
5.6 Removing and installing switch panel in centre console - vehicles equipped with MMI
basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
5.7 Heated rear seat switches with regulator E128 / E129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
6 Lights and switches in front seats, luggage compartment . . . . . . . . . . . . . . . . . . . . . . . . . . 218
6.1 Overview of lights and switches in front seats, luggage compartment . . . . . . . . . . . . . . . . 218
6.2 Removing and installing footwell light (rear) W45 / W46 . . . . . . . . . . . . . . . . . . . . . . . . . . 219
6.3 Removing and installing luggage compartment light W3 - saloon . . . . . . . . . . . . . . . . . . . . 219
6.4 Removing and installing luggage compartment light W18 / W3 / W61 - Avant . . . . . . . . . . 220
6.5 Removing and installing rear lid contact switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
6.6 Removing and installing button to close rear lid in luggage compartment E406 - Avant . . 221
7 Lights and switches in roof trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
7.1 Overview of lights and switches in roof trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

cardiagn.com
7.2 Removing and installing vanity mirror light bulb L31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
7.3 Removing and installing contact switch for vanity mirror F147 / F148 . . . . . . . . . . . . . . . . 223
7.4 Removing and installing interior light/reading light (front) . . . . . . . . . . . . . . . . . . . . . . . . . . 224
7.5 Renewing bulbs for front interior light W1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
7.6 Renewing reading light bulbs (front) W13 / W19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
7.7 Removing and installing sliding sunroof adjustment regulator E139 . . . . . . . . . . . . . . . . . . 226
7.8 Removing and installing LED for background lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
7.9 Removing and installing garage door operation control unit J530 . . . . . . . . . . . . . . . . . . 226
7.10 Removing and installing garage door operating unit E284 . . . . . . . . . . . . . . . . . . . . . . . . 227
7.11 Removing and installing rear interior light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
7.12 Renewing bulb for rear interior light W47 / W48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
7.13 Removing and installing interior light/reading light (rear) . . . . . . . . . . . . . . . . . . . . . . . . . . 228
7.14 Renewing bulb for rear interior light/reading light W47 / W48 . . . . . . . . . . . . . . . . . . . . . . 229
8 Components on interior mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
8.1 Exploded view of main beam assist system, humidity sender and lane departure warning
system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
8.2 Removing and installing humidity sender G355 - vehicles without main beam assist . . . . 231
8.3 Removing and installing humidity sender G355 - vehicles with main beam assist . . . . . . 232
9 Entry and start authorisation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
9.1 Overview of entry and start authorisation system . . AUDI
. . . AG
. . does
. . . not
. . guarantee
. . . . . .or.accept
. . . .any
. .liability
....... 235
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG.
9.2 Overview of keyless entry system . .the. .correctness
with respect to . . . . . .of. information
. . . . . . in. this
. . .document.
. . . . . Copyright
. . . . . .by. AUDI
. . . AG.
........ 236
9.3 Exploded view of exterior door handle for keyless entry system . . . . . . . . . . . . . . . . . . . . 238
9.4 Removing and installing contact sensor for front left/front right exterior door handle G605 /
G606 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
9.5 Removing and installing touch sensor for rear exterior door handle G417 / G418 . . . . . . 240
9.6 Removing and installing interior aerial 1 for entry and start authorisation R138 . . . . . . . . 241
9.7 Removing and installing left aerial for entry and start authorisation R200 . . . . . . . . . . . . 241
9.8 Removing and installing luggage compartment aerial for entry and start authorisation R137
...................................................................... 242
10 Ultrasonic interior monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
10.1 Overview of ultrasonic interior monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
10.2 Removing and installing interior monitoring switch E183 / alarm system off switch E217
........................................................................ 244
10.3 Removing and installing anti-theft alarm sensor G578 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
10.4 Removing and installing alarm horn H12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
11 Lane change assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
11.1 Overview of lane change assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

vi Contents
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11.2 Removing and installing button for lane change assist E530 . . . . . . . . . . . . . . . . . . . . . . 248
11.3 Removing and installing lane change assist warning lamp in exterior mirror K233 / K234 -
vehicles up to 05.2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
11.4 Removing and installing lane change assist warning lamp in exterior mirror K233 / K234 -
vehicles from 06.2009 onwards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
11.5 Removing and installing lane change assist control unit J769 / J770 . . . . . . . . . . . . . . . . 251
11.6 Calibrating lane change assist - test equipment layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
11.7 Calibrating lane change assist control unit J769 / J770 . . . . . . . . . . . . . . . . . . . . . . . . . . 252
12 Towing bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
12.1 Socket for towing bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
12.2 Removing and installing trailer detector control unit J345 . . . . . . . . . . . . . . . . . . . . . . . . . . 258

97 - Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
1 Contact corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
2 Relay carriers, fuse carriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
2.1 Overview of engine compartment electronics box, wiring junction, battery fuse holder . . . . 260
2.2 Removing and installing engine compartment electronics box . . . . . . . . . . . . . . . . . . . . . . 262
2.3 Removing and installing suppression filter C24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
2.4 Removing and installing fuse holder B SB in engine compartment electronics box . . . . . . 264

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2.5 Removing and installing fuse carrier in engine compartment electronics box . . . . . . . . . . 266
2.6 Removing and installing terminal 30 wiring junction 2 TV22 . . . . . . . . . . . . . . . . . . . . . . . . 267
2.7 Unplugging door separating connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
2.8 Removing and installing fuse holder A SA in luggage compartment . . . . . . . . . . . . . . . . . . 268
3 Relay carriers, fuse carriers (vehicle interior) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
3.1 Overview of relay carrier/fuse carrier (dash panel), relay carrier/fuse carrier (A-pillar) . . . . 270
3.2 Removing and installing fuse holder C SC with fuse carrier in dash panel (left-side) . . . . 271
3.3 Removing and installing fuse carrier in dash panel (left-side) . . . . . . . . . . . . . . . . . . . . . . 272
3.4 Removing and installing 3-position relay and fuse carrier . . . . . . . . . . . . . . . . . . . . . . . . . . 273
3.5 Removing and installing 4-position relay and fuse carrier with screw connection . . . . . . . . 274
3.6 Removing and installing onboard supply control unit J519 . . . . . . . . . . . . . . . . . . . . . . . . 275
3.7 Removing and installing mounting for relay and fuse carrier with onboard supply control unit
J519 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
3.8 Removing and installing 6-position connector point, A-pillar, driver's side . . . . . . . . . . . . . . 278
3.9 Removing and installing CAN isolating connector (interior) T46i . . . . . . . . . . . . . . . . . . . . 279
3.10 Removing and installing mounting for CAN isolating connector (interior) T46i . . . . . . . . . . 279
3.11 Removing and installing fuse holder D SD with fuse carrier in dash panel (right-side) . . . . 280
3.12 Removing and installing fuse carrier in dash panel (right-side) . . . . . . . . . . . . . . . . . . . . . . 281
3.13 Removing and installing CAN isolating connector (dash panel) T46s . . . . . . . . . . . . . . . . 281
3.14 Removing and installing mounting for CAN isolating connector (dash panel) T46s . . . . . . 282
3.15 Removing and installing 6-position connector point, A-pillar, passenger's side . . . . . . . . . . 283
4 Relay carriers, fuse carriers (luggage compartment) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
4.1 Overview of relay and fuse carrier (luggage compartment), control units . . . . . . . . . . . . . . 284
4.2 Removing and installing convenience system central control unit J393 . . . . . . . . . . . . . . 286
4.3 Removing and installing fuse holder F SF in luggage compartment (right-side) . . . . . . . . 287
4.4 Removing and installing fuse carrier in luggage compartment (right-side) . . . . . . . . . . . . 287
4.5 Removing and installing special vehicle control unit J608 . . . . . . . . . . . . . . . . . . . . . . . . 288
5 Repairing wiring harnesses and electrical connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
6 Repairing connector housings and electrical connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 291
7 ReleasingProtected
and dismantling connector housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
by copyright. Copying for private or commercial purposes, in part or in whole, is not
292
8 Cleaning contact surfaces with
permitted unless authorised contact
by AUDI AG. AUDI surface cleaning
AG does not guaranteeset VAS
or accept any6410
liability . . . . . . . . . . . . . . 293
with respect to the correctness of information in this document. Copyright by AUDI AG.
9 Repairing aerial wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
10 Fibre optic cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
11 Vehicle diagnostic, testing and information systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

Contents vii
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

viii Contents
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

27 – Starter, current supply, CCS

1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers, etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
Furthermore, rubber components or plastic components and ad‐
hesives are made of non-conductive material.
Always fit new components if you are not sure that the old com‐
ponents are suitable ⇒ Electronic parts catalogue .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Note: permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ We recommend the use of genuine replacement parts only;
they have been tested and are compatible with aluminium.
♦ We recommend using Audi Genuine Accessories.
♦ Damage resulting from contact corrosion is not covered by

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warranty.

1. Contact corrosion 1
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2 Battery
Observe notes on contact corrosion ⇒ page 1 .

2.1 Battery - general notes

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 27 :
♦ Safety measures and procedures to be followed
♦ Warnings and safety procedures when handling lead-acid bat‐
teries

2.2 Maintenance-free batteries

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 27 :
♦ Battery with “magic eye”
♦ Checking battery with “magic eye”
♦ Central gas venting system

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♦ Battery terminal screw connection
♦ Visual inspection of battery
♦ Checking colour indicator (electrolyte level in battery) - batter‐
ies with “magic eye”
♦ Checking electrolyte level in battery

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.3 Exploded view of battery - saloon

1 - Battery
❑ In luggage compart‐
ment in spare wheel well
❑ Removing and installing
⇒ page 8
2 - Bolt
3 - Nut
❑ 6 Nm
4 - Fuse holder A -SA-
❑ Disconnecting and con‐
necting
⇒ “2.7 Removing and in‐
stalling battery”,
page 8
❑ Removing and installing
⇒ page 268 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
5 - Cover for positive
with terminal
respect to the correctness of information in this document. Copyright by AUDI AG.

6 - Retainer
❑ For cover for tool kit
7 - Bolt
❑ 18 Nm
8 - Mounting
❑ For tool kit
9 - Cover
❑ For tool kit
10 - Nut
❑ For cover for tool kit
❑ 4 Nm
11 - Bolt
❑ 18 Nm
12 - Cover for negative terminal
13 - Nut
❑ 6 Nm
14 - Earth cable with battery monitor control unit -J367-
❑ Disconnecting and connecting ⇒ page 5
❑ Removing and installing ⇒ page 7
15 - Bolt
16 - Nut
❑ 20 Nm
17 - Hose for central gas venting system
18 - Bolt
❑ 18 Nm
19 - Retainer plate

2. Battery 3
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.4 Exploded view of battery - Avant

1 - Subwoofer
❑ Removing and installing
⇒ Rep. Gr. 91
2 - Retainer plate
3 - Battery
❑ In luggage compart‐
ment in spare wheel well
❑ Removing and installing
⇒ page 8
4 - Bolt
5 - Nut
❑ 6 Nm
6 - Fuse holder A -SA-
❑ Disconnecting and con‐
necting

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⇒ “2.7 Removing and in‐
stalling battery”,
page 8
❑ Removing and installing
⇒ page 268
7 - Cover for positive terminal
8 - Bolt
❑ 18 Nm
9 - Mounting
❑ For jack
10 - Temporary spare wheel
❑ Depending on equip‐
ment
11 - Nut
❑ For temporary spare
wheel
❑ 4 Nm
12 - Retainer
❑ For temporary spare wheel
13 - Bolt
❑ 18Protected
Nm by copyright. Copying for private or commercial purposes, in part or in whole, is not
14 - Cover with
for respect
negative terminalof information in this document. Copyright by AUDI AG.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
to the correctness

15 - Nut
❑ 6 Nm
16 - Earth cable with battery monitor control unit -J367-
❑ Disconnecting and connecting ⇒ page 5
❑ Removing and installing ⇒ page 7
17 - Bolt
18 - Nut
❑ 20 Nm

4 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

19 - Hose for central gas venting system

20 - Bolt
❑ 18 Nm

2.5 Disconnecting and connecting battery

Caution

Risk of accident.
♦ Contrary to the following description, the battery must be
disconnected with the ignition SWITCHED ON when
working on pyrotechnic components (e.g. airbags, belt
tensioners) ⇒ Rep. Gr. 69 .
Vehicles with TDI engine (SCR)
♦ After the ignition is switched off, the reducing agent is au‐
tomatically drawn back into the active tank for reducing
agent from the metering line going to the injector for re‐
ducing agent -N474- .

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♦ Before working in this area, you must therefore wait until
the reducing agent has been completely drawn out of the
metering line; this can take up to 10 minutes after the ig‐
nition has been switched off.
♦ For the same reason, it is important to wait until the re‐
ducing agent has been drawn back (i.e. 10 minutes) be‐
fore disconnecting the battery.

Disconnecting
– Switch off ignition and take out ignition key.
Saloon:
– Lift luggage compartment floor panel by handle and hook han‐
dle onto rear lid seal.
– Remove nut -1- and detach cover -2- for tool kit.

Avant:
– Take out luggage compartment floor -2-.
– Unscrew nut -1- and take out temporary spare wheel -3- (if
fitted).

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Battery 5
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Cover for negative terminal (version 1):

– Lift up cover -1- over negative terminal slightly -arrow-.
– Slacken off nut several turns and disconnect battery clamp
-2- of earth cable from battery terminal.

Cover for negative terminal (version 2):

– Open cover -1- over negative battery terminal.
– Slacken off nut -3- several turns and disconnect battery clamp
-2- of earth cable from battery terminal.

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Connecting
• Tightening torque: Saloon ⇒ page 3 , Avant ⇒ page 4 .
– Unplug electrical connector -2- at battery monitor control unit
-J367- -item 1-.
– When connecting battery, attach battery clamp of earth cable
to negative battery terminal “–” by hand and tighten nut -3-.
– Reconnect connector at battery monitor control unit -J367- .
The following measures are required after re-connecting the bat‐
tery:
♦ Activate automatic open/close function of electric window reg‐
ulators - see ⇒ Owner's Manual .
♦ Interrogate fault memories of all control units and erase “Low
voltage” fault display ⇒ Vehicle diagnosis, testing and infor‐
mation system VAS 5051.

Note

After reconnecting the voltage supply, it is possible that the ESP

warning lamp will not go out until the vehicle has been driven
several metres.

6 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.6 Removing and installing earth cable with

battery monitor control unit -J367-
Removing
– Switch off ignition and take out ignition key.

Caution

Vehicles with TDI engine (SCR)

♦ After the ignition is switched off, the reducing agent is au‐
tomatically drawn back into the active tank for reducing
agent from the metering line going to the injector for re‐
ducing agent -N474- .
♦ Before working in this area, you must therefore wait until
the reducing agent has been completely drawn out of the
metering line; this can take up to 10 minutes after the ig‐
nition has been switched off.
♦ For the same reason, it is important to wait until the re‐
ducing agent has been drawn back (i.e. 10 minutes) be‐
fore disconnecting the battery.

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Saloon:
– Lift luggage compartment floor panel and hook onto body.
– Remove nut -1- and detach cover -2- for tool kit.
– Remove mounting for tool kit.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Avant:
– Take out luggage compartment floor -2-.
– Unscrew nut -1- and take out temporary spare wheel -3- (if
fitted).
– If fitted, remove subwoofer ⇒ Rep. Gr. 91 .

2. Battery 7
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Cover for negative terminal (version 1):

– Lift up cover -2- over negative terminal slightly -arrow-.
– Slacken off nut several turns and disconnect battery clamp
-1- of earth cable from battery terminal.
– Unplug electrical connector -3-.
– Remove nut -6- and detach earth cable -5- with battery monitor
control unit -J367- -item 4-.

Cover for negative terminal (version 2):

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– Open cover -2- over negative battery terminal.
– Slacken off nut several turns and disconnect battery clamp
-1- of earth cable from battery terminal.
– Unplug electrical connector -3-.
– Remove nut -6- and detach earth cable -5- with battery monitor
control unit -J367- -item 4-.
Installing
• Tightening torque: Saloon ⇒ page 3 , Avant ⇒ page 4 .
Installation is carried out in the reverse order; note the following:
– Connect battery ⇒ page 6 .
– If fitted, install subwoofer ⇒ Rep. Gr. 91 .

2.7 Removing and installing battery

Removing
– Switch off ignition and take out ignition key.

Caution

Vehicles with TDI engine (SCR)

♦ After the ignition is switched off, the reducing agent is au‐
tomatically drawn back into the active tank for reducing
agentProtected
from the metering
by copyright. line
Copying goingor to
for private the injector
commercial purposes,for re‐or in whole, is not
in part
ducing agentunless
permitted -N474- . by AUDI AG. AUDI AG does not guarantee or accept any liability
authorised
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Before working in this area, you must therefore wait until
the reducing agent has been completely drawn out of the
metering line; this can take up to 10 minutes after the ig‐
nition has been switched off.
♦ For the same reason, it is important to wait until the re‐
ducing agent has been drawn back (i.e. 10 minutes) be‐
fore disconnecting the battery.

8 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Saloon:
– Lift luggage compartment floor panel and hook onto body.
– Remove nut -1- and detach cover -2- for tool kit.

Avant:
– Take out luggage compartment floor -2-.
– Unscrew nut -1- and take out temporary spare wheel -3- (if
fitted).

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Cover for negative terminal (version 1):
– Remove mounting -3- for tool kit.
– Remove bolts -arrows A-.
– Remove retainer -2- for cover over tool kit.
– Release the retaining clips -arrows B- using a screwdriver and
remove the cover -1- for the negative terminal.
– Connect battery charger to provide back-up power supply ⇒
Electrical system; General information; Rep. Gr. 27 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Battery 9
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Cover for negative terminal (version 2):

– If fitted, remove subwoofer -1- ⇒ Rep. Gr. 91 .
– Remove mounting -2- for tool kit.
– Remove bolts -arrows-.
– Remove retainer -4- for temporary spare wheel.
– Connect battery charger to provide back-up power supply ⇒
Electrical system; General information; Rep. Gr. 27 .

All vehicles (continued):

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– Loosen nut -4- a few turns and disconnect battery clamp of
earth cable from battery terminal.
– Open cover -3- over positive battery terminal.
– Loosen nut -2- several turns and disconnect battery clamp of
positive cable together with fuse holder A -SA- from battery
terminal.
– Pull off hose -5- for central gas venting system.
– Remove bolt -6- on battery retainer plate -7-.
– Pull battery -1- out of battery retainer.
– Lift battery out of luggage compartment.

WARNING

Observe environmental requirements.

♦ When disposing of used batteries, always observe the re‐
quired disposal procedures for batteries and sulphuric
acid ⇒ Electrical system; General information; Rep. Gr.
27 .

Installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• Tightening torque: Saloon ⇒ page 3 , Avant
permitted ⇒ pageby4AUDI
unless authorised . AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

♦ Only install maintenance-free batteries with the specifications

“TL82506” (from December 1997 onwards) and
“VW75073” (from August 2001 onwards).
♦ Batteries from the Audi parts range feature a base strip adapt‐
er for matching to different retainer flanges. The battery oper‐
ating instructions give details of when and how to use the base
strip adapter.

10 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Insert battery in battery mounting; the battery base strip must

engage in the retainer flanges of the battery mounting
-arrow-.
• It should no longer be possible to move the battery.

– Place battery retainer plate -7- in position.

• Lug on battery retainer plate must engage in recess on battery
base strip.
– Tighten bolt -6- for battery retainer plate.
– Connect hose -5- for central gas venting system. Observe
notes in ⇒ Electrical system; General information; Rep. Gr.
27 .

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Connect up battery -1- in the following sequence with ignition and
electrical equipment switched off:
– First connect battery clamp -2- of positive cable by hand to
positive battery terminal “+” and tighten nut.
– Close cover -3- over positive battery terminal.

Note

Disregard -item 4-.

– Unplug electrical connector -2- at battery monitor control unit

-J367- -item 1-.
– When connecting battery, attach battery clamp of earth cable
to negative battery terminal “–” by hand and tighten nut -3-.
– Reconnect connector at battery monitor control unit -J367- .
– After installation, check that battery is securely attached ⇒
Electrical system; General information; Rep. Gr. 27 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Battery 11
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Cover for negative terminal (version 1):

– Press cover -1- for negative terminal onto battery.
All vehicles (continued):
– Fit retainer -2- and tighten bolts -arrows A-.
– After renewing the battery, it must be adapted in “Guided Fault
Finding” or “Guided Functions” mode ⇒ Vehicle diagnosis,
testing and information system VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code
19 Data bus diagnostic interface J533
A Adapting battery after renewing
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
The following measures are required after re-connecting the bat‐

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tery:
♦ Activate automatic open/close function of electric window reg‐
ulators - see ⇒ Owner's Manual .
♦ Interrogate fault memories of all control units and erase “Low
voltage” fault display ⇒ Vehicle diagnosis, testing and infor‐
mation system VAS 5051.

Note

After reconnecting the voltage supply, it is possible that the ESP

warning lamp will not go out until the vehicle has been driven
several metres.

2.8 Checking battery

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 27 :
♦ Battery test with diagnostic systems -VAS 5051B- , -
VAS 5052- and -VAS 5053-
♦ Measuring no-load voltage - vehicles with battery monitor con‐
trol unit -J367- or energy management control unit -J644-

2.9 Charging battery

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr.Protected
27 : by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
♦ Charging battery with battery charger -VAS 5095A- , -VAS
with respect to the correctness of information in this document. Copyright by AUDI AG.

5900- , -VAS 5903- or -VAS 5904-

♦ Totally discharged battery
♦ Back-up power supply of battery via battery charger -VAS
5095A- , -VAS 5900- , -VAS 5903- or -VAS 5904-

12 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.10 Preparations before charging battery

Procedure

WARNING

Risk of explosion due to a discharged battery with “magic eye”.

♦ The battery must NOT be checked or charged if the indi‐
cator of the “magic eye” is colourless or yellow. Do NOT
boost start the vehicle. There is a risk of explosion when
checking or charging the battery or boost starting the ve‐
hicle. The battery must be renewed.

Before connecting battery charger, it is necessary to perform the

following steps:

Note

Wherever possible, the battery should be installed in the vehicle

and connected while it is charged. Otherwise, the charging cur‐

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rent will not be taken into account in the capacity calculation of
battery monitor control unit -J367- .

– Switch off ignitionProtected

and all electrical equipment; then take out
by copyright. Copying for private or commercial purposes, in part or in whole, is not

ignition key.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Vehicles up to 05.2008:
– Unclip plenum chamber cover -2- and detach.

Note

Disregard -items 1, 3- and -arrow-.

Vehicles from 06.2008 onwards:

– Lift off cover -1- at handle -arrow-.

2. Battery 13
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All vehicles (continued):

– Release catch -arrow A- and open cover -arrow B-.

– Connect red clamp “+” of battery charger to remote positive

terminal -1- and black clamp “–” to earth terminal -2-.
– Plug in mains connector of battery charger and switch on bat‐
tery charger ⇒ Electrical system; General information; Rep.
Gr. 27 .
– Leave rear lid open during charging.

cardiagn.com
2.11 Preparations for back-up power supply
of battery
Procedure
Vehicles up to 05.2008:
– Unclip plenum chamber cover -2- and detach.

Note

Disregard -items 1, 3- and -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

14 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Vehicles from 06.2008 onwards:

– Lift off cover -1- at handle -arrow-.

All vehicles (continued):

– Release catch -arrow A- and open cover -arrow B-.

cardiagn.com
– Connect red clamp “+” of battery charger to remote positive
terminal -1- and black clamp “–” to earth terminal -2-.
– Plug in mains connector of battery charger and switch on bat‐
tery charger ⇒ Electrical system; General information; Rep.
Gr. 27 .

2.12 Removing and installing battery isola‐

tion igniter -N253-
If battery isolation igniter -N253- is defective or has tripped, renew
battery isolation igniter -N253- ⇒ Rep. Gr. 69 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Battery 15
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3 Start/stop system

3.1 Safety precautions for vehicles with

start/stop system

Caution

Risk of injury due to automatic engine start.

♦ On vehicles with activated start/stop system (this is indi‐
cated by a message in the instrument cluster display), the
engine may start automatically on demand.
♦ Therefore it is important to ensure that the start/stop sys‐
tem is deactivated when performing repairs (switch off
ignition, if required switch on ignition again).
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

3.2 Exploded view of start/stop system

permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
1 - Voltage stabiliser -J532-
❑ Removing and installing
⇒ page 17
2 - Nut
❑ 3 Nm
3 - Nut
❑ 3 Nm
4 - Cover/ multimedia system
operating unit -E380-
5 - Start/stop operation button
-E693-
❑ Removing and installing
⇒ page 216
6 - Nut
❑ 3 Nm
7 - Bracket
❑ For voltage stabiliser -
J532-
8 - Electrical connector

16 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.3 Removing and installing voltage stabil‐

iser -J532-
Removing
– Switch off ignition and take out ignition key.
Saloon:
– Lift luggage compartment floor panel and hook onto body.
– Unscrew nut and take out temporary spare wheel (if fitted).
– If fitted, remove subwoofer ⇒ Rep. Gr. 91 .
Avant:
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Remove spare
with respect wheel well
to the correctness lining ⇒
of information Rep.
in this Gr. Copyright
document. 70 . by AUDI AG.
All vehicles (continued):
– Unplug electrical connector -2-.
– Release retaining tabs -3- and -4- and pull voltage stabiliser -
J532- -item 1- out of mounting -arrow A-.
Installing

cardiagn.com
Installation is carried out in the reverse order; note the following:
– Install subwoofer ⇒ Rep. Gr. 91 .
– Install spare wheel well lining ⇒ Rep. Gr. 70 .

3. Start/stop system 17
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4 Alternator
Observe notes on contact corrosion ⇒ page 1 .

4.1 Exploded view of alternator without sliding bushes

1 - Bolts
❑ 23 Nm
2 - Alternator
❑ Removing and instal‐
ling:
♦ Vehicles with 1.8 ltr. and
2.0 ltr. TFSI engine
⇒ page 18
♦ Vehicles with 3.0 ltr. TFSI
and 3.2 ltr. FSI engine
⇒ page 20
3 - Electrical connector

cardiagn.com
4 - Terminal 30/B+
5 - Cap
6 - Nut
❑ 16 Nm

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4.2 Removing and installing alternator - ve‐

hicles with 1.8 ltr. and 2.0 ltr. TFSI en‐
gine
Special tools and workshop equipment required

18 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Locking tool -T40098-

Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .

Caution

Risk of breakage if the poly V-belt runs in the opposite direction

cardiagn.com
when refitted.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
♦ Before removing, mark direction of operation of poly V-belt
with respect to the correctness of information in this document. Copyright by AUDI AG.
with chalk or felt-tipped pen in preparation for re-installa‐
tion.

– To loosen poly V-belt, pivot tensioner for poly V-belt in direc‐

tion of -arrow- and lock in place using locking pin -T40098- .
– Take off poly V-belt.

– Unscrew bolts (top and bottom) -arrows- and pivot the alter‐
nator forwards.

– Unplug electrical connector -1-.

– Unscrew terminal 30/B+ -item 2-.
– Take out alternator.

4. Alternator 19
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torques ⇒ page 18
Installation is carried out in the reverse order; note the following:
– Fit poly V-belt onto pulleys in the following sequence:
1- Crankshaft
2- Coolant pump
3- Tensioner for poly V-belt
4- Alternator
5- Power steering pump
6- Air conditioner compressor
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Note with respect to the correctness of information in this document. Copyright by AUDI AG.

When installing poly V-belt, make sure it is properly seated on

pulleys.

cardiagn.com
– Connect battery. Steps required ⇒ page 6 .
– Start engine and check that belt runs properly.

4.3 Removing and installing alternator - ve‐

hicles with 3.0 ltr. TFSI and 3.2 ltr. FSI
engine
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove front noise insulation (release fasteners -1- and -2-).

20 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bolt -1- and nut -3-.

– Detach strut -2- for lock carrier (right-side).

Caution

Risk of breakage if the poly V-belt runs in the opposite direction

when refitted.
♦ Before removing, mark direction of operation of poly V-belt
with chalk or felt-tipped pen in preparation for re-installa‐

cardiagn.com
tion.

– To slacken poly V-belt turn tensioner in direction of -arrow-.

– Remove poly V-belt from alternator pulley.
– Release pressure from tensioner.

Vehicles with automatic gearbox:

Note

Observe rules for cleanliness when working on automatic gear‐

box ⇒ Rep. Gr. 00 .

– Remove bolt -arrow- for ATF pipes.

– Slacken nut -1- on bracket for electrical wiring several turns.

Note

Disregard -item 2-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Alternator 21
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Drain coolant ⇒ Rep. Gr. 19 .

– Lift retaining clip and remove coolant hose -2- from radiator.

Note

Disregard -item 1-.

– Move coolant hose clear to one side and upwards.

All vehicles (continued):

– Unplug electrical connector at oil level and oil temperature
sender -G266- and move clear wiring harness at alternator.
– Unscrew bolts -arrows- and detach alternator.
– Unplug electrical connector -1-.
– Unscrew terminal 30/B+ -item 2-.

cardiagn.com
Installing
• Tightening torques ⇒ page 18
Installation is carried out in the reverse order; note the following:
Vehicles with automatic gearbox:
– Secure ATF pipes ⇒ Rep. Gr. 37 .
– Fill up with coolant ⇒ Rep. Gr. 19 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
All vehicles (continued): permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Attach strut for lock carrier (right-side) ⇒ Rep. Gr. 50 .

– Fit poly V-belt onto pulleys in the following sequence:
1- Alternator
2- Idler roller
3- Coolant pump
4- Power steering pump
5- Air conditioner compressor
6- Tensioner for poly V-belt
7- Crankshaft

Note

When installing poly V-belt, make sure it is properly seated on

pulleys.

– Connect battery. Steps required ⇒ page 6 .

– Start engine and check that belt runs properly.

22 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4.4 Exploded view of alternator with sliding bushes

1 - Bolts
❑ 23 Nm
2 - Alternator
❑ Removing and instal‐
ling:
♦ Vehicles with 2.0 ltr. TDI
engine ⇒ page 23 .
♦ Vehicles with 2.7 ltr. and
3.0 ltr. TDI engine without
auxiliary heater
⇒ page 26
♦ Vehicles with 2.7 ltr. and
3.0 ltr. TDI engine with aux‐
iliary heater ⇒ page 31
♦ Vehicles with 2.7 ltr. and
3.0 ltr. TDI engine with dual

cardiagn.com
clutch gearbox
⇒ page 37
3 - Sliding bush
❑ Ensure that bushes
slide freely, as the
clamping pressure of a
stiff bush will be insuffi‐
cient even when the cor‐
rect tightening torque is
applied
4 - Electrical connector
5 - Nut
❑ 16 Nm
6 - Cap
7 - Terminal 30/B+

4.5 Removing and installing alternator - ve‐

hicles
Protected by copyright. Copying forwith 2.0
private or ltr. TDI
commercial engine
purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Special tools and workshop equipment required
with respect to the correctness of information in this document. Copyright by AUDI AG.

♦ Locking tool -T40098-

4. Alternator 23
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Detach engine cover panel -arrows-.

– Unfasten retaining clips -arrows- and remove toothed belt cov‐

er (top).

cardiagn.com
Caution

Risk of breakage if the poly V-belt runs in the opposite direction

when refitted.
♦ Before removing, mark direction of operation of poly V-belt
with chalk or felt-tipped pen in preparation for re-installa‐
tion.

– To slacken poly V-belt turn tensioner in direction of -arrow-.

– Remove poly V-belt from alternator pulley.
– Secure tensioner with locking tool -T40098- .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Release hose clip -2- and detach air hose -3- from throttle
valve module -J338- .
– Remove bolt -1-.

24 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unscrew nut -3- and unplug electrical connector -1-.

– Detach continued coolant circulation pump -V51- -item 2- with
retainer and move clear to one side (with coolant hoses at‐
tached).

– Unscrew centre hex stud -2- and pull coolant pipe -1- (with
hoses connected) in direction of -arrow-.

cardiagn.com
– Unscrew terminal 30/B+ -item 1-.
– Unplug electrical connector -2-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Alternator 25
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unscrew bolts -arrows-.

Note

♦ If alternator sticks in retainer, screw bolt back in again down

to the last 2 turns.
♦ Tap carefully on bolt heads with flat side of hammer to release
threaded bushes of alternator mount.

– Pull coolant pipe to one side and detach alternator -1-.

Installing
• Tightening torque ⇒ page 23
Installation is carried out in the reverse order; note the following:
– To facilitate positioning of alternator, drive back bushes for
securing bolts slightly.

Note

cardiagn.com
Stiff alternator mount bushes must be freed; otherwise the clamp‐
ing force of the bush will not be adequate even when the bolts are
tightened to the correct torque.

– Fit poly V-belt onto pulleys in the following sequence.

1- Vibration damper
2- Air conditioner compressor
3- Power steering pump
4- Idler roller
5- Tensioner
6- Alternator

Note

When installing poly V-belt, make sure it is properly seated on

pulleys.

– Connect battery. Steps required ⇒ page 6 .

– Start engine and check that belt runs properly.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
4.6 Removing and installing alternator - ve‐
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

hicles with 2.7 ltr. and 3.0 ltr. TDI engine

with respect to the correctness of information in this document. Copyright by AUDI AG.

without auxiliary heater

Special tools and workshop equipment required

26 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Socket Torx T 60 -T40087-

Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Detach engine cover panel -arrows-.

cardiagn.com
– Remove air duct -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -1- at air mass meter -G70- .

– Remove bolt -3- and move clear exhaust gas pressure sensor
1 -G450- -item 4- at air pipe.
– Move clear electrical connector -2- for temperature sender af‐
ter particulate filter -G527- at air pipe.
– Remove air intake hose with air mass meter -G70- . To do so,
release hose clip -5- and clamps -arrows-.

4. Alternator 27
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Disconnect vacuum line -1-.

– Detach air cleaner (bottom section) and unplug electrical con‐
nector -2- on back at air filter bypass flap valve -N275- .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove bolts -2- and -3-.

cardiagn.com
– Detach air pipe from air hose (release hose clip -1-).
– Remove front right wheel.
– Detach front section of front right wheel housing liner and
press to rear ⇒ Rep. Gr. 66 .

– Remove front noise insulation panels (release fasteners -1-

and -2-).

Note

Disregard -items 3 and 4-.

28 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Vehicles with gear oil cooling: Remove bolt -arrow- for ATF
pipes.

– Slacken nut -1- on bracket for electrical wiring several turns.

Note

Disregard -item 2-.

cardiagn.com
– Detach air hose from air pipe (right-side) and move clear to
one side (release hose clip -arrow-).

Caution

Risk of breakage if the poly V-belt runs in the opposite direction

when refitted.
♦ Before removing, mark direction of operation of poly V-belt
with chalk or felt-tipped pen in preparation for re-installa‐
tion.

– To slacken poly V-belt, pivot tensioner in direction of -arrow-

using 60 mm Torx socket -T40087- .
– Remove poly V-belt from alternator pulley.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Alternator 29
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unscrew bolts -arrows- for alternator approx. 6 turns.

– Tap carefully on bolt heads with a hammer to release bushes
securing alternator.
– Remove bolts completely.

– Detach alternator from retainer.

– Unscrew terminal 30/B+ -item 1-.
– Unplug electrical connector -2-.
– Remove alternator downwards.
Installing
• Tightening torque ⇒ page 23

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Installation is carried out in the reverse order; note the following:
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– To facilitate positioning of alternator, drive back sliding bushes

for securing bolts slightly.

Note

Stiff alternator mount bushes must be freed; otherwise the clamp‐

ing force of the bush will not be adequate even when the bolts are
tightened to the correct torque.

– Vehicles with gear oil cooling: secure ATF pipes ⇒ Rep. Gr.
37 .
– Install air pipe (right-side) ⇒ Rep. Gr. 21 .

30 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Fit poly V-belt onto pulleys in the following sequence.

1- Alternator
2- Idler roller
3- Idler roller
4- Coolant pump
5- Idler roller (depending on version)
6- Power steering pump
7- Air conditioner compressor
8- Tensioner for poly V-belt
9- Crankshaft

Note
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
When installing poly V-belt, make sure it is properly seated
permitted on
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
pulleys. with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
– Connect battery. Steps required ⇒ page 6 .
– Start engine and check that belt runs properly.

4.7 Removing and installing alternator - ve‐

hicles with 2.7 ltr. and 3.0 ltr. TDI engine
with auxiliary heater
Special tools and workshop equipment required
♦ Hose clamps up to 25 mm -3094-

♦ Socket Torx T 60 -T40087-

4. Alternator 31
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Detach engine cover panel -arrows-.

– Remove air duct -arrow-.

cardiagn.com
– Unplug electrical connector -1- at air mass meter -G70- .
– Remove bolt -3- and move clear exhaust gas pressure sensor
1 -G450- -item 4- at air pipe.
– Move clear electrical connector -2- for temperature sender af‐
ter particulate filter -G527- at air pipe.
– Remove air intake hose with air mass meter -G70- . To do so,
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

release hose clipwith

-5- andtoclamps -arrows-.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
respect the correctness of information in this document. Copyright by AUDI AG.

32 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Disconnect vacuum line -1-.

– Detach air cleaner (bottom section) and unplug electrical con‐
nector -2- on back at air filter bypass flap valve -N275- .

– Remove plenum chamber partition panel ⇒ Rep. Gr. 50 .

cardiagn.com
– Remove bolts -2- and -3-.
– Detach air pipe from air hose (release hose clip -1-).

– Pinch off coolant hoses -1- and -2- with hose clamps up to 25
mm -3094- .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Alternator 33
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove front right wheel.

– Detach front section of front right wheel housing liner and
press to rear ⇒ Rep. Gr. 66 .
– Remove front noise insulation panels (release fasteners -1-
and -2-).

Note

Disregard -items 3 and 4-.

– Remove nut -1- at rubber bush.

cardiagn.com
– Unscrew nut at clamp -3- and detach exhaust pipe -2- at si‐
lencer.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove bolt -1- and nut -3-.

– Detach strut -2- for lock carrier (right-side).

34 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bolts -2-.

– Remove bolt -4-, disengage retainer bracket -3- and detach.
– Detach retainer for circulation pump -V55- -item 1-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Vehicles with gear oil cooling: Remove bolt -arrow- for ATF

cardiagn.com
pipes.

– Disconnect coolant hose -2- using hose clamps up to 25 mm

-3094- .
– Detach coolant hose from coolant pipe -1-.

– Slacken nut -1- on bracket for electrical wiring several turns.

Note

Disregard -item 2-.

4. Alternator 35
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Detach air hose from air pipe (right-side) and move clear to
one side (release hose clip -arrow-).

Caution

Risk of breakage if the poly V-belt runs in the opposite direction

when refitted.
♦ Before removing, mark direction of operation of poly V-belt
with chalk or felt-tipped pen in preparation for re-installa‐

cardiagn.com
tion.

– To slacken poly V-belt, pivot tensioner in direction ofProtected

-arrow- by copyright. Copying for private or commercial purposes, in part or in whole, is not

using 60 mm Torx socket -T40087- .

permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove poly V-belt from alternator pulley.

– Unscrew bolts -arrows- for alternator approx. 6 turns.

– Tap carefully on bolt heads with a hammer to release bushes
securing alternator.
– Remove bolts completely.

Note

♦ If necessary, unplug electrical connector -1- for radiator fan;

to do so, slide locking element to rear -arrow- and press down
release mechanism.
♦ Move clear electrical wiring so that it will not be damaged when
removing alternator.

36 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Detach alternator from retainer.

– Unscrew terminal 30/B+ -item 1-.
– Unplug electrical connector -2-.
– Take out alternator towards right.
Installing
• Tightening torque ⇒ page 23
Installation is carried out in the reverse order; note the following:
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Note

Stiff alternator mount bushes must be freed; otherwise the clamp‐

ing force of the bush will not be adequate even when the bolts are
tightened to the correct torque.

– To facilitate positioning of alternator, drive back sliding bushes

for securing bolts slightly.
– Install retainer for circulation pump -V55- ⇒ Rep. Gr. 82 .

cardiagn.com
– Install circulation pump -V55- ⇒ Rep. Gr. 82 .
– Vehicles with gear oil cooling: secure ATF pipes ⇒ Rep. Gr.
37 .
– Install air pipe (right-side) ⇒ Rep. Gr. 21 .
– Install plenum chamber partition panel ⇒ Rep. Gr. 50 .
– Fill up with coolant ⇒ Rep. Gr. 19 .

– Fit poly V-belt onto pulleys in the following sequence.

1- Alternator
2- Idler roller
3- Idler roller
4- Coolant pump
5- Idler roller (depending on version)
6- Power steering pump
7- Air conditioner compressor
8- Tensioner for poly V-belt
9- Crankshaft

Note

When installing poly V-belt, make sure it is properly seated on

pulleys.

– Connect battery. Steps required ⇒ page 6 .

– Start engine and check that belt runs properly.

4.8 Removing and installing alternator - ve‐

hicles with 2.7 ltr. and 3.0 ltr. TDI engine
with dual clutch gearbox
Special tools and workshop equipment required

4. Alternator 37
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Socket Torx T 60 -T40087-

Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Detach engine cover panel -arrows-.

cardiagn.com
– Remove air duct -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -1- at air mass meter -G70- .

– Remove bolt -3- and move clear exhaust gas pressure sen‐
sor 1 -G450- -item 4- at air pipe.
– Move clear electrical connector -2- for temperature sender af‐
ter particulate filter -G527- at air pipe.
– Remove air intake hose with air mass meter -G70- . To do so,
release hose clip -5- and clamps -arrows-.

38 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Disconnect vacuum line -1-.

– Detach air cleaner (bottom section) and unplug electrical con‐
nector -2- on back at air filter bypass flap valve -N275- .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove bolts -2- and -3-.

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– Detach air pipe from air hose (release hose clip -1-).

– Remove front right wheel.

– Detach front section of front right wheel housing liner and
press to rear ⇒ Rep. Gr. 66 .
– Remove front noise insulation -1- ⇒ Rep. Gr. 66 .

4. Alternator 39
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bolt -1- and nut -3-.

– Detach strut -2- for lock carrier (right-side).

– Remove bolt -arrow- for ATF pipes.

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– Cut open cable tie -3-.
– Unscrew nut -2- and detach earth cable at longitudinal mem‐
ber.
– Remove nut -1- and detach bracket with wiring harness from
subframe.

– Detach air hose from air pipe (right-side) and move clear to
one side (release hose clip -arrow-).

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

40 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Caution

Risk of breakage if the poly V-belt runs in the opposite direction

when refitted.
♦ Before removing, mark direction of operation of poly V-belt
with chalk or felt-tipped pen in preparation for re-installa‐
tion.

– To slacken poly V-belt, pivot tensioner in clockwise direction

-arrow- using socket Torx T 60 -T40087- .
– Remove poly V-belt from alternator pulley and release ten‐
sioner.

– Unscrew bolts -arrows- for alternator approx. 6 turns.

– Tap carefully on bolt heads with a hammer to release bushes
securing alternator.
– Remove bolts completely.

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Detach alternator from retainer.

– Unscrew terminal 30/B+ -item 1-.
– Unplug electrical connector -2-.

4. Alternator 41
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove alternator -1- towards right side from between wiring

harness -2- and ATF pipes -3-.
Installing
• Tightening torque ⇒ page 23
Installation is carried out in the reverse order; note the following:

Note

Stiff alternator mount bushes must be freed; otherwise the clamp‐

ing force of the bush will not be adequate even when the bolts are
tightened to the correct torque.

– To facilitate positioning of alternator, drive back sliding bushes

for securing bolts slightly.
– Secure ATF pipes ⇒ Rep. Gr. 34 .
– Install air pipe (right-side) ⇒ Rep. Gr. 21 .

– Fit poly V-belt onto pulleys in the following sequence:

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1- Alternator
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
2- Idler roller permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
3- Idler roller
4- Coolant pump
5- Idler roller (depending on version)
6- Power steering pump
7- Air conditioner compressor
8- Poly V-belt tensioner
9- Vibration damper

Note

When installing poly V-belt, make sure it is properly seated on

pulleys.

– Connect battery. Steps required ⇒ page 6 .

– Start engine and check that poly V-belt runs properly.

42 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5 Checking and servicing alternator

5.1 Checking alternator

Checking alternator is performed in “Guided Fault Finding” se‐
lecting “Body/Electrical system / 27 - Starter, current supply/
electrical components / C- Alternator, checking” ⇒ Vehicle diag‐
nosis, testing and information system VAS 5051.

5.2 Servicing alternator

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 27 :
♦ Bosch alternator from 2007 onwards - exploded view
♦ Removing and installing voltage regulator - Bosch alternator
from 2007 onwards
♦ Checking carbon brushes - all
Protected by types
copyright. of Bosch
Copying alternators
for private or commercial from
purposes, in part or in whole, is not
2001 onwards permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Valeo alternator from 2001 onwards - exploded view

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♦ Removing and installing voltage regulator - Valeo alternator
from 2007 onwards
♦ Checking carbon brushes - Valeo alternator from 2007 on‐
wards
♦ Removing and installing poly V-belt pulley without free-wheel
♦ Removing and installing poly V-belt pulley with free-wheel

5. Checking and servicing alternator 43

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6 Starter
Observe notes on contact corrosion ⇒ page 1 .

6.1 Exploded view of starter

1 - Bolt
❑ Tightening torque:
♦ Vehicles with manual gear‐
box ⇒ Rep. Gr. 34
♦ Vehicles with automatic
gearbox ⇒ Rep. Gr. 37
♦ Vehicles with dual clutch
gearbox ⇒ Rep. Gr. 34
2 - Spacer sleeve
❑ Only on vehicles with 4-
cyl. engine
3 - Starter

cardiagn.com
❑ Removing and instal‐
ling:
♦ Vehicles with 1.8 ltr. and
2.0 ltr. TFSI engine
⇒ page 45
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
♦ Vehicles withunless
permitted 3.0 authorised
ltr. TFSIby AUDI AG. AUDI AG does not guarantee or accept any liability
and 3.2 with
ltr. respect
FSI engine
to the correctness of information in this document. Copyright by AUDI AG.
⇒ page 46
♦ Vehicles with 2.0 ltr. TDI
engine ⇒ page 48 .
♦ Vehicles with 2.7 ltr. and
3.0 ltr. TDI engine
⇒ page 50
♦ Vehicles with 2.7 ltr. and
3.0 ltr. TDI engine with dual
clutch gearbox
⇒ page 51
4 - Terminal B+
5 - Nut
❑ 15 Nm
6 - Electrical connector
7 - Bolt
❑ Tightening torque:
♦ Vehicles with manual gearbox ⇒ Rep. Gr. 34
♦ Vehicles with automatic gearbox ⇒ Rep. Gr. 37
♦ Vehicles with dual clutch gearbox ⇒ Rep. Gr. 34

44 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.2 Removing and installing starter - vehi‐

cles with 1.8 ltr. and 2.0 ltr. TFSI engine
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove engine mounting (right-side) ⇒ Rep. Gr. 10 .
– Remove nut -1- and move earth cable clear at engine support.
– Remove bolts -arrows- and detach engine support (right-side).

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
– Remove bolt -1- for retainer -2- for wiring harness.

– Unplug connector -3- by sliding locking element to rear and

pressing down release catch.
– Unscrew wire -2- at starter.
– Unscrew bolts -1- and -4- and remove starter.

Note

-Item 1- is accessible from above.

6. Starter 45
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torques ⇒ page 44
Installation is carried out in the reverse order; note the following:
– On vehicles with automatic gearbox and 2.0 ltr. FSI engine,
check wether locking part -1- is properly inserted in starter
opening before installing starter.
• The locking part must align with the starter opening -2-
-arrow-.

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Caution

Risk of damage to starter.

♦ To tighten bolt -2-, spacer sleeve -arrow- must be inserted
between starter and gearbox. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install engine support and engine mounting (right-side) ⇒
Rep. Gr. 10 .
– Connect battery. Steps required ⇒ page 6 .

6.3 Removing and installing starter - vehi‐

cles with 3.0 ltr. TFSI and 3.2 ltr. FSI
engine
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove noise insulation panels (release fasteners
-1, 2, 3, 4-).

Note

Disregard -arrow-.

Vehicles with manual gearbox / multitronic gearbox:

– Remove plenum chamber partition panel ⇒ Rep. Gr. 50 .
– Remove front silencer (right-side) ⇒ Rep. Gr. 26 .

46 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unscrew nuts -arrows- and bolt -1- and press catalytic con‐
verter (right-side) towards right.

Note

Fitting location is shown with engine removed for illustration pur‐

poses.

All vehicles (continued):

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Remove engine mounting (right-side) ⇒ Rep. Gr. 10 .unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
permitted
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Remove nut -1- and move earth cable clear at engine support.
– Remove bolts -arrows- and detach engine support (right-side).

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– Unplug connector -3- by sliding locking element to rear and
pressing down release catch.
– Unscrew wire -2- at starter.
– Unscrew bolts -1- and -4- and remove starter.

Note

-Item 1- is accessible from above.

6. Starter 47
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torques ⇒ page 44
Installation is carried out in the reverse order; note the following:
– On vehicles with automatic gearbox and 3.2 ltr. FSI engine,
check wether locking part -1- is properly inserted in starter
opening before installing starter.
• The locking part must align with the starter opening -2-
-arrow-.
– Install engine support and engine mounting (right-side)
Protected ⇒ for private or commercial purposes, in part or in whole, is not
by copyright. Copying
Rep. Gr. 10 . permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Vehicles with manual gearbox / multitronic gearbox:
– Install catalytic converter (right-side) ⇒ Rep. Gr. 26 .

Note

Exhaust manifold must be removed to renew gasket for exhaust

manifold ⇒ Rep. Gr. 26 .

cardiagn.com
– Install front silencer (right-side) ⇒ Rep. Gr. 26 .
– Install plenum chamber partition panel ⇒ Rep. Gr. 50 .
All vehicles (continued):
– Connect battery. Steps required ⇒ page 6 .

6.4 Removing and installing starter - vehi‐

cles with 2.0 ltr. TDI engine
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove engine mounting (right-side) ⇒ Rep. Gr. 10 .
– Remove bolts -1- and -2- and detach turbocharger support.

48 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove nut -1- and move earth cable clear at engine support.
– Remove bolts -arrows- and detach engine support (right-side).

– Remove bolt -1- for retainer -2- for wiring harness.

cardiagn.com
– Unplug connector -3- by sliding locking element to rear and
pressing down release catch.
– Unscrew wire -2- by
Protected atcopyright.
starter.Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Remove bolts -4-.
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unscrew bolt -1- from gearbox side using long extension.

– Detach starter.

6. Starter 49
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torques ⇒ page 44
Installation is carried out in the reverse order; note the following:

Caution

Risk of damage to starter.

♦ To tighten bolt -2-, spacer sleeve -arrow- must be inserted
between starter and gearbox.

– Install engine support and engine mounting (right-side) ⇒

Rep. Gr. 10 .
– Connect battery. Steps required ⇒ page 6 .

6.5 Removing and installing starter - vehi‐

cles with 2.7 ltr. and 3.0 ltr. TDI engine
Removing

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– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove front exhaust pipe ⇒ Rep. Gr. 26 .
– Remove alternator: vehicles without auxiliary heater
⇒ page 26 ; vehicles with auxiliary heater ⇒ page 31 .
– Remove engine mounting (right-side) ⇒ Rep. Gr. 10 .
– Remove bolts -1- and -2-.
– Press bottom right coolant pipe to one side.

Note

Disregard -item 3-.

– Remove nut -1- and move earth cable clear at engine support.
– Remove bolts -arrows- and detach engine support (right-side).

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

50 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug connector -3- by sliding locking element to rear and

pressing down release catch.
– Unscrew wire -2- at starter.
– Unscrew bolts -1- and -4- and remove starter.

Note

-Item 1- is accessible from above.

Installing
• Tightening torques ⇒ page 44
Installation is carried out in the reverse order; note the following:
– On vehicles with automatic gearbox and 3.0 ltr. TDI engine,
check wether locking part -1- is properly inserted in starter
opening before installing starter.

cardiagn.com
• The locking part must align with the starter opening -2-
-arrow-.
– Install engine support and engine mounting (right-side) ⇒
Rep. Gr. 10 .
– Install bottom right coolant pipe ⇒ Rep. Gr. 19 .
– Install alternator: vehicles without auxiliary heater
⇒ page 26 ; vehicles with auxiliary heater ⇒ page 31 .
– Install diesel particulate filter ⇒ Rep. Gr. 26 .
– Connect battery. Steps required ⇒ page 6 .

6.6 Removing and installing starter - vehi‐

cles with 2.7 ltr. and 3.0 ltr. TDI engine
with dual clutch gearbox Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Removing with respect to the correctness of information in this document. Copyright by AUDI AG.

– With ignition switched off, disconnect earth cable at battery

⇒ page 5 .
– Remove front exhaust pipe ⇒ Rep. Gr. 26 .
– Remove alternator ⇒ page 37 .
– Remove engine mounting (right-side) ⇒ Rep. Gr. 10 .
– Remove bolts -1- and -2-.
– Press bottom right coolant pipe to one side.

Note

Disregard -item 3-.

6. Starter 51
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove nut -1- and move earth cable clear at engine support.
– Remove bolts -arrows- and detach engine support (right-side).

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove bolts -1- and -4-.

Note

-Item 1- is accessible from below.

– Unplug connector -3- by sliding locking element to rear and

cardiagn.com
pressing down release catch.
– Unscrew wire -2- at starter.
– Detach starter.

Installing
• Tightening torques ⇒ page 44
Installation is carried out in the reverse order; note the following:
– On vehicles with 3.0 ltr. TDI engine, check wether locking part
-1- is properly inserted in starter opening before installing
starter.
• The locking part must align with the starter opening -2-
-arrow-.
– Install engine support and engine mounting (right-side) ⇒
Rep. Gr. 10 .
– Install bottom right coolant pipe ⇒ Rep. Gr. 19 .
– Install alternator ⇒ page 37 .
– Install front exhaust pipe ⇒ Rep. Gr. 26 .
– Connect battery. Steps required ⇒ page 6 .

52 Rep. Gr.27 - Starter, current supply, CCS

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7 Cruise control system (CCS)

The following description is given in ⇒ Electrical system; General
information; Rep. Gr. 27 :
♦ Activating/deactivating cruise control system

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com

7. Cruise control system (CCS) 53

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

90 – Gauges, instruments
1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers, etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
Furthermore, rubber components or plastic components and ad‐
hesives are made of non-conductive material.
Always fit new components if you are not sure that the old com‐
ponents are suitable ⇒ Electronic parts catalogue .
Note:
♦ We recommend the use of genuine replacement parts only;
they have been tested and are compatible with aluminium.
♦ We recommend using Audi Genuine Accessories.
♦ Damage resulting from contact corrosion is not covered by

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warranty.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

54 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2 Instrument cluster
Observe notes on contact corrosion ⇒ page 54 .

Note

All warning lamps in instrument cluster are fitted with light-emitting

diodes. Instrument cluster must be renewed in the event of warn‐
ing lamp failure.

2.1 Exploded view of instrument cluster and radio-controlled clock receiver

1 - Oil level and oil temperature

sender -G266-
❑ Removing and installing
⇒ Rep. Gr. 17
2 - Oil pressure switch -F1-
❑ Removing and installing

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⇒ Rep. Gr. 17
3 - Electrical connector
❑ For data bus diagnostic
interface -J533-
4 - Data bus diagnostic inter‐
face -J533-
❑ Exploded view
⇒ page 74
5 - Bolt
❑ Tightening torque
⇒ page 74
6 - Connector for fibre optic ca‐
ble
❑ Cover with protective
cap for wiring harness
connector -VAS
6223/9- .
7 - Instrument cluster
❑ With control unit in dash
panel insert -J285- Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ Removing and installing with respect to the correctness of information in this document. Copyright by AUDI AG.
⇒ page 56
❑ Assignment of contacts
at multi-pin connectors
⇒ page 58
8 - Electrical connector
❑ For instrument cluster
9 - Bolt
❑ 2.5 Nm
10 - Trim cover
❑ Removing and installing ⇒ Rep. Gr. 68
11 - Bolt
❑ 2.5 Nm

2. Instrument cluster 55
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

12 - Bolt
❑ 2.5 Nm
13 - Fuel gauge sender -G-
❑ Pin assignment ⇒ page 58
❑ Removing and installing ⇒ Rep. Gr. 20
14 - Fuel gauge sender 2 -G169-
❑ Pin assignment ⇒ page 59
❑ Removing and installing ⇒ Rep. Gr. 20
15 - Radio-controlled clock receiver -J489-
❑ Removing and installing ⇒ page 61
16 - Bolt
❑ 2.5 Nm
17 - Bolt
❑ 2.5 Nm Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
18 - Electrical connector permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ For radio-controlled clock receiver -J489-

cardiagn.com
19 - Washer fluid level sender -G33-
❑ Removing and installing ⇒ page 90
20 - Brake pad wear sender
❑ Front left -G34-
❑ Removing and installing ⇒ Rep. Gr. 46
21 - Brake fluid level warning contact -F34-
❑ Removing and installing ⇒ Rep. Gr. 47
22 - Coolant shortage indicator switch -F66-
23 - Electrical connector
❑ For ambient temperature sensor -G17-
24 - Ambient temperature sensor -G17-
❑ Removing and installing ⇒ page 60

2.2 Removing and installing instrument

cluster with control unit in dash panel in‐
sert -J285-

Note

♦ The instrument cluster must not be dismantled.

♦ Removal of instrument cluster does not involve taking out
steering wheel.

Removing
– When renewing instrument cluster with control unit in dash
panel insert -J285- select “Replacement” function for appro‐
priate control unit in “Guided Fault Finding” or “Guided Func‐
tions” ⇒ Vehicle diagnosis, testing and information system
VAS 5051.
– Select function or path:
Vehicle brand

56 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Engine code
17 Dash panel insert J285
17 Control unit replacement (Repair Group 90)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
– Move steering wheel down and to rear as far as possible,
making use of full range of steering column adjuster.
– Switch off ignition and take out ignition key.
– Pull off trim cover ⇒ Rep. Gr. 68 .
– Place trim cover on steering column trim (top).
– Remove dash panel vent (left-side) ⇒ Rep. Gr. 70 .
– Remove cover for MMI screen ⇒ Rep. Gr. 70 .
– Remove bolts -arrows-.
– Pull out instrument cluster -1- until it makes contact with steer‐
ing wheel.
– Unplug electrical connector.

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– Unplug electrical connector by releasing catch -1- and moving
retaining clip in direction of -arrow-.
– Remove instrument cluster towards driver's side between
steering wheel and dash panel.
Installing
• Tightening torque ⇒ page 55
Installation is carried out in the reverse order; note the following:
– Continue to follow the instructions on the display of the vehicle
diagnostic tester for a new instrument cluster.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Instrument cluster 57
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.3 Pin assignment at multi-pin connector

on instrument cluster
32-pin connector, grey
1- Not used
2- CAN bus (screening) wake-up wire
3- CAN bus (Low) wake-up wire
4- CAN bus (High) wake-up wire
5- Sender earth for fuel gauge sender -G- - pin 2
6- Fuel gauge sender -G- - pin 4
7- Fuel gauge sender -G- - pin 3
8- Switch panel
9- Fuel gauge sender 2 -G169- - Pin 2
10 - Fuel gauge sender 2 -G169- - Pin 1
11 - Not used

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12 - Not used
13 - Not used
14 - Not used
15 - Not used
16 - Not used
17 - Not used
18 - Not used
19 - Not used
20 - Check button
21 - Not used
22 - Not used
23 - Radio-controlled clock 5V
24 - Radio-controlled clock signal
25 - Oil level
26 - Not used
27 - Not used
28 - Not used
29 - Terminal 31
30 - Terminal 31
31 - Terminal 30 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
32 - Terminal 30 with respect to the correctness of information in this document. Copyright by AUDI AG.

2.4 Pin assignment at fuel gauge sender -G-

– Unplug 5-pin connector at sealing flange of fuel tank; Proce‐
dure ⇒ Rep. Gr. 20 ; Checking fuel gauge sender -G- .

58 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Assignment of 5-pin connector at fuel gauge sender -G-

1- Switched positive for fuel system pressurisation pump -G6-
2- Wiring between fuel gauge sender -G- and instrument clus‐
ter (sender earth) - Pin 5
3- Wiring between fuel gauge sender -G- and instrument clus‐
ter (fuel gauge) - Pin 7
4- Wiring between fuel gauge sender -G- and instrument clus‐
ter (fuel gauge) - Pin 6
5- Earth for fuel system pressurisation pump -G6-

Note

On vehicles with FSI or TFSI engine, pins -2, 3 and 4- are looped
through the fuel pump control unit -J538- .

2.5 Pin assignment at fuel gauge sender 2 -

G169-

cardiagn.com
– Unplug 2-pin connector at flange on fuel tank; Procedure ⇒
Rep. Gr. 20 ; Checking fuel gauge sender 2 -G169- .
Pin assignment for 2-pin connector at fuel gauge sender 2 -G169-
1- Wiring between fuel gauge sender 2 -G169- and instrument
cluster (sender earth) - Pin 10
2- Wiring between fuel gauge sender 2 -G169- and instrument
cluster (fuel gauge) - Pin 9

2.6 Pin assignment at coolant temperature

sender -G62- - FSI engines
Preparations
– Unplug 2-pin connector at coolant temperature sender -G62- ;
Procedure ⇒ Rep. Gr. 19 ; Removing and installing coolant
temperature sender -G62- (do not remove sender).
Pin assignment for Protected
2-pin connector at coolant
by copyright. Copying temperature
for private senderin part or in whole, is not
or commercial purposes,
-G62- permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
1- Sender earth
2- Wiring connection from coolant temperature sender -G62-
to engine control unit

2. Instrument cluster 59
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.7 Pin assignment at coolant temperature

senders -G62- / -G83- - TDI engines
Preparations
– Unplug 2-pin connector at coolant temperature sender -G62- ;
Procedure ⇒ Rep. Gr. 19 ; Removing and installing coolant
temperature sender -G62- (do not remove sender).
– Unplug 2-pin connector at radiator outlet coolant temperature
sender -G83- ; Procedure ⇒ Rep. Gr. 19 ; Removing and
installing radiator outlet coolant temperature sender -G83- (do
not remove sender).
Pin assignment for 2-pin connector at coolant temperature sender
-G62-
1- Sender earth
2- Wiring connection from coolant temperature sender -G62-
to engine control unit

cardiagn.com
Pin assignment for 2-pin connector on radiator outlet coolant tem‐
perature sender -G83-
1- Sender earth
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
2- Wiring connection from radiator outlet coolant
permitted unlesstemperature
authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
sender -G83- to engine control unit with respect to the correctness of information in this document. Copyright by AUDI AG.

2.8 Removing and installing ambient tem‐

perature sensor -G17-
Removing
– Remove bolts -1, 2, 3, 5- for fasteners.
– Lift cover -4- on lock carrier -arrow- and detach from radiator
grille.

60 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -1-.

– Carefully compress retaining clips -arrow- and lift ambient
temperature sensor -G17- -item 2- out of retainer.
Installing
Installation is carried out in the reverse order; note the following:
– Install lock carrier cover at radiator grille ⇒ Rep. Gr. 63 .

2.9 Removing and installing radio-control‐

led clock receiver -J489-
Removing
– Remove rear bumper cover ⇒ Rep. Gr. 63 .
– Remove bolts -arrows- and detach radio-controlled clock re‐
ceiver -J489- -item 2-.

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– Unplug electrical connector -1- at radio-controlled clock re‐
ceiver -J489- .
Installing
• Tightening torque ⇒ page 55
Installation is carried out in the reverse order; note the following:
– Install rear bumper cover ⇒ Rep. Gr. 63 .
Lane change assist control unit -J769- / -J770- must be recali‐
brated whenever bumper cover has been removed
⇒ “11.6 Calibrating lane changeProtected
assistby- copyright.
test equipment layout”,
Copying for private or commercial purposes, in part or in whole, is not
page 251 . permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Instrument cluster 61
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3 Cigarette lighter, electric socket

3.1 Exploded view of cigarette lighter, 12 V socket and 230 V socket

1 - Mounting
❑ For cigarette lighter -U1-
2 - Cigarette lighter -U1-
❑ Removing and installing
⇒ page 63
3 - Cigarette lighter
4 - Cigarette lighter illumination
bulb -L28-
❑ Removing and installing
⇒ page 63 unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted

5 - Centre console
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
6 - Socket illumination bulb -
L42-
❑ For 12 V socket -U5-
❑ Removing and installing
⇒ page 65
7 - 12 V socket -U5-
❑ Removing and installing
⇒ “3.4 Removing and in‐
stalling socket illumina‐
tion bulb L42 ( 12 V
socket U5 )”, page 65
8 - Mounting with cover
❑ For 12 V socket 3 -U19-
(Avant)
9 - Luggage compartment side
trim (right-side)
10 - Nut
❑ 2 Nm
11 - 12 V socket 3 -U19-
(Avant)
❑ Removing and installing ⇒ page 70
❑ Renewing ⇒ page 70
12 - Nut
❑ 2 Nm
13 - Mounting with cover
❑ For 12 V socket 3 -U19- (saloon)
14 - 12 V socket 3 -U19- (saloon)
❑ Removing and installing ⇒ page 69
❑ Renewing ⇒ page 70
15 - Socket illumination bulb -L42-
❑ For 12 V socket 2 -U18-
❑ Removing and installing ⇒ page 69

62 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

16 - Centre console (rear)

17 - Mounting
❑ With 12 V socket 2 -U18- or 230 volt socket for AC/DC converter with socket, 12 V - 230 V -U13- (de‐
pending on equipment version)
18 - 12 V socket 2 -U18-
❑ Removing and installing ⇒ page 67

Tightening torque for AC/DC converter with socket, 12 V - 230 V

-U13-
– Tighten bolts -arrows- to 1.4 Nm.

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3.2 Removing and installing cigarette lighter
illumination bulb -L28-
Removing
– Remove front ashtray ⇒ Rep. Gr. 68 .
– Pry off cover -1- from top of cigarette Protected
lighter by illumination bulb
copyright. Copying for private or commercial purposes, in part or in whole, is not
-L28- -arrows-. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Using a small screwdriver -1-, carefully pry cigarette lighter

illumination bulb -L28- -item 3- off cigarette lighter -U1-
-item 2- in direction of -arrow-.
Installing
Installation is carried out in the reverse order; note the following:
– Install front ashtray ⇒ Rep. Gr. 68 .

3.3 Removing and installing cigarette lighter

-U1-
Special tools and workshop equipment required

3. Cigarette lighter, electric socket 63

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Puller -T40148-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Removing
– Remove cigarette lighter illumination bulb -L28- ⇒ page 63 .
– Release tabs -2- on puller -T40148- must engage in recesses
in cigarette lighter -U1- -item 3- -arrow-; for this purpose, push
threaded rod -1- downwards as far as stop.

cardiagn.com
– Insert puller -T40148- into cigarette lighter -U1- -item 1- as far
as stop.
– Turn knurled wheel -2- on puller -T40148- clockwise as far as
stop.

• The piston -2- moves upwards and the release tabs -1- on
puller -T40148- spread apart -arrows-.
– Use puller -T40148- to pull cigarette lighter out of illuminated
ring.

64 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Release retaining clips in direction of -arrows-.

– Take cigarette lighter with illuminated ring -1- out of ashtray
(front) -2-.
Installing
Installation is carried out in the reverse order; note the following:

Caution

Risk of injury.
♦ After detaching puller -T40148- check that retaining tabs
for lighter are not bent.
♦ If retaining tabs are bent they must be bent back to prevent
lighter from ejecting.

– Detach support -1- from puller -T40148- .

– Push piston downwards and hold in this position.

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– Turn knurled wheel -4- on puller -T40148- anti-clockwise
-arrow-; this will open release tabs -2- on cigarette lighter -U1-
-item 3- and puller -T40148- can be removed.
– Press illuminated ring for cigarette lighter into mounting until
retaining clip engages.
• Illuminated ring can only be fitted in one position into mounting.

3.4 Removing and installing socket illumi‐

nation bulb -L42- ( 12 V socket -U5- )
Special tools and workshop equipment required
♦ Puller -T40148-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3. Cigarette lighter, electric socket 65

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Vehicles equipped with MMI basic: Remove cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Remove multime‐
dia system operating unit -E380- ⇒ Rep. Gr. 91 .
– Unclip electrical connection -2- from holder.
– Unplug electrical connector -1- and attach a long cord to it.

Note

The cord has to be attached to the connector so that the electrical

wire for the 12 V socket -3- can be pulled through again towards
the front without having to remove the centre console.

– Release tabs -2- on puller -T40148- must engage in recesses

in 12 V socket -U5- -item 3- -arrow-; for this purpose, push
threaded rod -1- downwards as far as stop.

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– Open cover -1- of 12 V socket -U5- and hold in this position.
– Insert puller -T40148- into 12 V socket -U5- as far as stop.
– Turn knurled wheel -2- on puller -T40148- clockwise as far as
stop.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

66 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

• The piston -2- moves upwards and the release tabs -1- on
puller -T40148- spread apart -arrows-.
– Use puller -T40148- to pull 12 V socket -U5- out of illuminated
ring with socket illumination bulb -L42- .
– Unplug electrical connector.

– Release retaining clips in direction of -arrows-.

– Take illuminated ring -1- with socket illumination bulb -L42- out
of storage compartment -2- in centre console.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Installing
Installation is carried out in the reverse order; note the following:
– Detach support -1- from puller -T40148- .
– Push piston downwards and hold in this position.
– Turn knurled wheel -4- on puller -T40148- anti-clockwise
-arrow-; this will open release tabs -2- on 12 V socket -U5-
-item 3- and puller -T40148- can be removed.
– Vehicles equipped with MMI basic: Install cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Install multimedia
system operating unit -E380- ⇒ Rep. Gr. 91 .

3.5 Removing and installing 12 V socket 2 -

U18-
Special tools and workshop equipment required
♦ Puller -T40148-

3. Cigarette lighter, electric socket 67

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Release tabs -2- on puller -T40148- must engage in recesses
in 12 V socket -3- -arrow-; for this purpose, push threaded rod
-1- downwards as far as stop.

– Open cover -2- of 12 V socket and hold in this position.

– Insert puller -T40148- into 12 V socket -3- as far as stop.
– Turn knurled wheel -1- on puller -T40148- clockwise as far as
stop.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

• The piston -2- moves upwards and the release tabs -1- on
puller -T40148- spread apart -arrows-.
– Use puller -T40148- to pull 12 V socket out of illuminated ring
with socket illumination bulb -L42- .
– Unplug electrical connector.

Installing
Installation is carried out in the reverse order; note the following:
– Detach support -1- from puller -T40148- .
– Push piston downwards and hold in this position.
– Turn knurled wheel -4- on puller -T40148- anti-clockwise
-arrow-; this will open release tabs -2- on 12 V socket -3- and
puller -T40148- can be removed.

68 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.6 Removing and installing socket illumi‐

nation bulb -L42-
– Remove 12 V socket ⇒ page 67 .
– Release retaining clips in direction of -arrows-.
– Take illuminated ring -1- with socket illumination bulb -L42- out
of rear trim panel -2- for centre console.
Installing
Installation is carried out in the reverse order; note the following:
– Illuminated ring can only be fitted in one position into mounting.
– Install 12 V socket ⇒ page 67 .

3.7 Removing and installing AC/DC con‐

verter with socket, 12 V - 230 V -U13-
Removing
– Remove centre console ⇒ Rep. Gr. 68 .

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– Remove cup holder ⇒ Rep. Gr. 68 .
– Remove bolts -arrows-.
– Pull AC/DC converter with socket, 12 V - 230 V -U13-
-item 1- downwards off cup holder -2-.
Installing
• Tightening torque ⇒ page 63
Installation is carried out in the reverse order; note the following:
– Install cup holder ⇒ Rep. Gr. 68 .
– Install centre console ⇒ Rep. Gr. 68 .

3.8 Removing and installing 12 V socket 3 -

U19- - saloon
Removing
– Switch off ignition and take out ignition key.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Open cover -4- in luggage compartment side trim (right-side)
with respect to the correctness of information in this document. Copyright by AUDI AG.

-arrow-.
– Unplug electrical connector -3-.
– Unscrew nut -1-.
– Remove 12 volt socket 3 -U19- -item 2- from cover of luggage
compartment side trim (right-side).
Installing
• Tightening torque ⇒ page 62
Install in reverse order.

3. Cigarette lighter, electric socket 69

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.9 Removing and installing 12 V socket 3 -

U19- - Avant
Removing
– Switch off ignition and take out ignition key.
– Open cover -4- in luggage compartment side trim (right-side)
-arrow-.
– Unplug electrical connector -3-.
– Unscrew nut -1-.
– Remove 12 volt socket 3 -U19- -item 2- from cover of luggage
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
compartment side trim (right-side). with respect to the correctness of information in this document. Copyright by AUDI AG.
Installing
• Tightening torque ⇒ page 62
Install in reverse order.

cardiagn.com
3.10 Renewing 12 V socket 3 -U19-
Special tools and workshop equipment required
♦ Puller -T40148-

Removing
– Open cover in luggage compartment side trim (right-side).
– Unplug electrical connector.
– Release tabs -2- on puller -T40148- must engage in recesses
in 12 V socket 3 -U19- -item 3- -arrow-; for this purpose, push
threaded rod -1- downwards as far as stop.

70 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Open cover of mounting -2- and hold in this position.

– Insert puller -T40148- into 12 V socket 3 -U19- -item 3- as far
as stop.
– Turn knurled wheel -1- on puller -T40148- clockwise as far as
stop.

• The piston -2- moves upwards and the release tabs -1- on
puller -T40148- spread apart -arrows-.
– Remove 12 V socket 3 -U19- from mounting.

cardiagn.com
Installing
Installation is carried out in the reverse order; note the following:
– Detach support -1- from puller -T40148- .
– Push piston downwards and hold in this position.
– Turn knurled wheel -4- on puller -T40148- anti-clockwise
-arrow-; this willProtected
open by release
copyright.tabs -2-
Copying for on 12orVcommercial
private socketpurposes,
3 -U19-in part or in whole, is not
-item 3- and puller -T40148-
permitted can be
unless authorised removed.
by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3. Cigarette lighter, electric socket 71

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4 Horns
Observe notes on contact corrosion ⇒ page 54 .

4.1 Exploded view of horns

1 - Impact bar
❑ With bracket for horn
2 - Nut
❑ 9 Nm
3 - Bass horn -H7-
❑ Removing and installing
⇒ page 73
4 - Treble horn -H2-
❑ Removing and installing
⇒ page 73
5 - Nut

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❑ 9 Nm

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

72 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4.2 Removing and installing horns -H2- / -

H7-
Removing
– Switch off ignition and take out ignition key.
– Remove relevant front wheel housing liner ⇒ Rep. Gr. 66 .
– Remove nut -2-.
– Remove horn -3- from bracket.
– Unplug electrical connector -1-.
Installing
• Tightening torque ⇒ page 72
Installation is carried out in the reverse order; note the following:
– Install front wheel housing liner ⇒ Rep. Gr. 66 .

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Horns 73
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5 Data bus diagnostic interface

5.1 Exploded view of data bus diagnostic interface

1 - Electrical connector
❑ For data bus diagnostic
interface -J533-
2 - Data bus diagnostic inter‐
face -J533-
❑ Removing and installing
⇒ page 74
3 - Bolt
❑ 3 Nm
4 - Connector for fibre optic ca‐
ble
❑ Cover with protective

cardiagn.com
cap for wiring harness
connector -VAS
6223/9- .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

5.2 Data bus diagnostic interface -J533-

♦ The data bus diagnostic interface -J533- interlinks the various
CAN bus systems in the vehicle.
♦ For example, it transfers data from the engine control unit
(powertrain CAN bus) to the instrument cluster (instrument
cluster CAN bus).
♦ Fault finding is performed via “Guided Fault Finding” ⇒ Vehicle
diagnosis, testing and information system VAS 5051.
♦ Repair of CAN bus wiring ⇒ Electrical system; General infor‐
mation; Rep. Gr. 97 .

5.3 Removing and installing data bus diag‐

nostic interface -J533-
Special tools and workshop equipment required

74 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Protective cap for cable connector -VAS 6223/9- from light

conductor wiring repair set -VAS 6223-

Removing
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:

cardiagn.com
Vehicle brand
Engine code
19 Data bus diagnostic interface J533 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
19 Control unit replacement (Repair Group
with 90)
respect to the correctness of information in this document. Copyright by AUDI AG.

– Continue to follow the instructions on the display of the vehicle

diagnostic tester.
– Switch off ignition and take out ignition key.
– Remove glove box ⇒ Rep. Gr. 68 .
– Remove bolt -2-.
– Take data bus diagnostic interface -J533- -item 3- out of re‐
tainer -arrow-.
– Unplug electrical connector -4-.
– Unplug connector for fibre optic cable -1-.

5. Data bus diagnostic interface 75

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Seal open connector plug -2- of fibre optic cable with protective
cap for cable connector -VAS 6223/9- -item 1-.

Note

Protective cap prevents contamination of or mechanical damage

to end face of fibre optic cable which would impair light transmis‐
sion.

Installing
• Tightening torque ⇒ page 74
Installation is carried out in the reverse order; note the following:
– Install glove box ⇒ Rep. Gr. 68 .
– Continue to follow the instructions on the display of the vehicle
diagnostic tester for a new data bus diagnostic interface -
J533- .

5.4 Connector at data bus diagnostic inter‐

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face -J533-
Connection for optical MOST bus (fibre optic cable) -item A-
1- Input
2- Output

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

76 Rep. Gr.90 - Gauges, instruments

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Multi-pin connector, 20-pin -item B-

1- Battery + (terminal 30)
2- LIN 1
3- Screening (ACC-Rel.)
4- Screening (electronic steering column lock)
5- CAN bus Low (convenience)
6- CAN bus Low (drive)
7- CAN bus Low (extended)
8- CAN bus Low (instrument cluster)
9- CAN Bus Low (diagnosis)
10 - Screening (MOST diagnosis)
11 - Earth – (terminal 31)
12 - LIN 2
13 - Instrument cluster wake-up

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14 - Terminal 15
15 - CAN bus High (convenience)
16 - CAN bus High (drive)
17 - CAN bus High (extended)
18 - CAN bus High (instrument cluster)
19 - CAN bus High (diagnosis)
20 - Screening
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

5. Data bus diagnostic interface 77

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

92 – Windscreen wash/wipe system

1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers, etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
Furthermore, rubber components or plastic components and ad‐
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

hesives are made of non-conductive material.

permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Always fit new components if you are not sure that the old com‐
ponents are suitable ⇒ Electronic parts catalogue .
Note:
♦ We recommend the use of genuine replacement parts only;
they have been tested and are compatible with aluminium.
♦ We recommend using Audi Genuine Accessories.
♦ Damage resulting from contact corrosion is not covered by

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warranty.

78 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2 Overview of windscreen wiper and washer system / headlight washer

system

1 - Headlight washer jet

❑ Exploded view
⇒ page 102
❑ Removing and installing
⇒ page 103
2 - Washer jet
❑ Exploded view
⇒ page 87
❑ Removing and installing
⇒ page 92
3 - Wiper arm
❑ Exploded view
⇒ page 80
❑ Removing and installing

cardiagn.com
⇒ page 82
4 - Wiper motor -V-
❑ With wiper motor control
unit -J400- Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ Exploded view with respect to the correctness of information in this document. Copyright by AUDI AG.
⇒ page 80
❑ Removing and installing
⇒ page 84
5 - Rain and light sensor -
G397-
❑ Removing and installing
⇒ Rep. Gr. 64
6 - Grommet
❑ For washer fluid hose in
bonnet
7 - Washer fluid reservoir
❑ Exploded view
⇒ page 87
❑ Removing and installing ⇒ page 89
8 - Filler neck
❑ For washer fluid reservoir
❑ Exploded view ⇒ page 87
❑ Removing and installing ⇒ page 88

2. Overview of windscreen wiper and washer system / headlight washer system 79

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3 Windscreen wiper system

Observe notes on contact corrosion ⇒ page 78 .

3.1 Exploded view of windscreen wiper system

1 - Bolt
❑ Tightening sequence
⇒ page 81
2 - Wiper motor -V-
❑ With wiper motor control
unit -J400-
❑ Removing and installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
⇒ page 84 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
3 - Bolt
❑ Tightening sequence
⇒ page 81
4 - Nut

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❑ 17 Nm
5 - Cap
6 - Wiper arm, passenger's
side (LHD)
❑ Different length ⇒ Elec‐
tronic parts catalogue
❑ Removing and installing
⇒ page 82
❑ Adjusting ⇒ page 83
7 - Wiper blade, passenger's
side (LHD)
❑ Different length ⇒ Elec‐
tronic parts catalogue
❑ Renewing ⇒ page 82
8 - Wiper blade, driver's side
(LHD)
❑ Different length ⇒ Elec‐
tronic parts catalogue
❑ Renewing ⇒ page 82
9 - Wiper arm, driver's side (LHD)
❑ Different length ⇒ Electronic parts catalogue
❑ Removing and installing ⇒ page 82
❑ Adjusting ⇒ page 83
10 - Cap
11 - Nut
❑ 17 Nm
12 - Bolt
❑ Tightening sequence ⇒ page 81
13 - Water drain channel

80 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Wiper motor -V- - tightening torque and tightening sequence

– Tighten bolts in the sequence -1, 2, 3- in 2 stages as follows:
1. Screw in by hand as far as stop.
2. Tighten to 8 Nm.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3.2 Moving windscreen wipers to service

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position

Note

The bonnet must be completely closed if the wiper motor needs

to be run during repair work (the voltage supply to the wiper motor
is cut off when the bonnet is open).

– At sub-zero temperatures, first check that the wiper blades are

not frozen onto the glass.
– Switch on ignition.
– Activate menu option: Windscreen wipers “on” via multimedia
system operating unit ⇒ Owner's Manual .
• The wipers will run to the “service position”.
– Switch off ignition.

Caution

The bonnet can be damaged if the wipers are allowed to run

back to the park position.
♦ Do not move the vehicle when the wiper arms are lifted up
off the windscreen.
♦ The wipers automatically run back to the park position
when the wiper switch is operated or when road speed
exceeds 6 km/h.

3. Windscreen wiper system 81

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.3 Renewing wiper blade

Removing
– Move windscreen wipers to service position ⇒ page 81 .
– Lift wiper arm off windscreen.
– Press retaining clip -arrow A-.
– Slide wiper blade -1- off wiper arm -2- -arrow B-.
– Remove wiper blade.
Installing

Caution

Risk of damage to body.

♦ The wiper blades for driver's and front passenger's side
have different lengths.

Installation is carried out in the reverse order; note the following:

cardiagn.com
– Guide wiper blade -1- into wiper arm -2- in parallel position
-arrow-. Make sure that retaining clip on wiper blade is heard
to engage in wiper arm when fitting wiper blade.
– The wipers will run back from the “service position” when you
operate the wiper switch or when road speed exceeds 6 km/
h.

3.4 Removing and installing wiper arms

Special tools and workshop equipment required
♦ Tool kit for wiper arms -T10369-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Removing

Note

If the wiper motor needs to be run during repair work, the bonnet
must be closed (voltage supply to wiper motor is cut off when
bonnet is open).

82 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Move windscreen wipers to service position ⇒ page 81 .

– Switch off ignition and take out ignition key.
– Pry cover caps -arrows- off wiper arms -1- with a screwdriver.
– Loosen nuts -2- several turns.

cardiagn.com
– Apply puller -T10369/1- at wiper arm -1- as shown in illustra‐
tion.
– Apply thrust piece -2- at wiper shaft.
– Turn bolt -3- clockwise until wiper arm is clear of wiper shaft.
– Remove nuts completely and detach wiper arms.
Installing

Caution

Risk of damage to body.

♦ The wiper arms for driver's and front passenger's side
have different lengths.

Installation is carried out in the reverse order; note the following:

– Adjust wiper arms ⇒ page 83 .

3.5 Adjusting wiper arms

Procedure

Note

If the wiper motor needs to be run during repair work, the bonnet
must be closed (voltage supply to wiper motor is cut off when
bonnet is open).

– Remove wiper arms ⇒ page 82 .

– Switch on ignition. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Operate “touch-wipe function”with
and allow
respect wiper
to the motor
correctness to move
of information in this document. Copyright by AUDI AG.
to end position.

3. Windscreen wiper system 83

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Note

♦ Every second time the wiper motor is switched off it runs back
slightly after reaching the end position, which turns the lip of
the wiper blade in the opposite direction.
♦ The wiper motor moves the wiper arms down beyond their end
position and then back up slightly. This slightly raised position
must not be used when aligning the wiper crank.
♦ You must use the end setting at which the wiper motor moves
directly to its park position
Protected (without
by copyright. Copyingreturning). Operatepurposes,
for private or commercial the in part or in whole, is not
“touch-wipe function”
permittedagain as necessary.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Switch off ignition.

– Attach wiper arm with fitted wiper blade to wiper shaft and po‐
sition wiper blade on windscreen as follows:
• Dimension -a- = 0 + 10 mm
• Dimension -b- = 7 + 10 mm

cardiagn.com
Note

Dimensions indicate distance between tips of wiper blades and

cowl panel trim at bottom edge of windscreen.

– Tighten nuts -2- for wiper arms -1-.

• Tightening torque ⇒ page 80
– Switch on ignition.
– Operate “touch-wipe function” and allow wiper arms to move
to end position.
– Switch off ignition.
– Check setting of wiper arms again. Correct as necessary.
– Press cover caps -arrows- onto wiper arms.

3.6 Removing and installing wiper motor -V-

with wiper motor control unit -J400-
Special tools and workshop equipment required

84 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal lever -80 - 200-

Removing
– Remove wiper arms ⇒ page 82 .
Vehicles up to 05.2008:
– Detach seal -arrow-.
– Unclip plenum chamber covers -1 ... 3- and detach.

cardiagn.com
Vehicles from 06.2008 onwards:
– Remove bolts -3-.
– Unclip retaining clips -2- from retainer and detach plenum
chamber cover -1-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3. Windscreen wiper system 85

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All vehicles (continued):

– Pull off retaining clips -2- -arrow A-.

Caution

Risk of damage to cowl panel trim.

♦ Apply a small quantity of soap solution to the transition
between the windscreen and cowl panel trim. Then, start‐
ing at the edge of windscreen, carefully pull the cowl panel
trim -1- vertically up and out of retainer at windscreen
-arrows B-.

– Detach cowl panel trim -1-. To do so, carefully pull cowl panel
trim off retainer at windscreen -arrows B-.

– Unplug electrical connector -2-.

– Pull water drain channel -3- off linkage -arrow A-.
– Remove bolts -4, 5, 6-.

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– Rotate wiper frame -1- upwards -arrow B- together with link‐
age and wiper motor, and remove from plenum chamber
towards front of vehicle.
Installing
• Tightening torque ⇒ page 81
Installation is carried out in the reverse order; note the following:
– Fit wiper motor with wiper frame in vehicle.
– Tighten bolts ⇒ page 81 .
– Attach water drain channel to wiper motor.
– Adjust wiper arms ⇒ page 83 .

3.7 Renewing wiper motor -V- with wiper

motor control unit
Protected -J400-
by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Procedure with respect to the correctness of information in this document. Copyright by AUDI AG.

– When renewing control unit select “Replacement” function for

appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code
09 Electronic central electrics J519
J400 Replacement (Repair Group 92)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.

86 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4 Windscreen washer system

Observe notes on contact corrosion ⇒ page 78 .

4.1 Exploded view of washer fluid reservoir, washer fluid hoses, washer jets

1 - Bolt
❑ Tightening sequence
⇒ page 88
2 - O-ring
❑ Renew if damaged
3 - Sealing grommet
❑ Renew if damaged
4 - Filler neck
❑ For washer fluid reser‐
voir
❑ Removing and installing
⇒ page 88

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5 - Support ring
6 - Nut
❑ Bolt connection with
body brace
❑ Tightening torque ⇒
Rep. Gr. 40
7 - Cap
❑ For filler neck
8 - Washer fluid hose
❑ For windscreen washer
system
9 - Right washer jet
❑ With right washer jet
heater
Protected element
by copyright. -Z21-
Copying for private or commercial purposes, in part or in whole, is not
(depending
permitted on version)
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ Removing and installing
⇒ page 92
❑ Adjusting ⇒ page 92
10 - Left washer jet
❑ With left washer jet heater element -Z20- (depending on version)
❑ Removing and installing ⇒ page 92
❑ Adjusting ⇒ page 92
11 - Washer fluid reservoir
❑ Removing and installing ⇒ page 89
12 - Headlight washer system pump -V11-
13 - Sealing grommet
14 - Washer fluid hose
❑ For headlight washer system
15 - Retaining ring
❑ For washer pump -V5-

4. Windscreen washer system 87

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

16 - Washer pump -V5-

❑ Removing and installing ⇒ page 91
17 - Sealing grommet
18 - Bolt
❑ Tightening sequence ⇒ page 88
19 - Sealing grommet
20 - Washer fluid level sender -G33-
❑ Removing and installing ⇒ page 90

Washer fluid reservoir - tightening torque and tightening se‐

quence
– Tighten bolts for washer fluid reservoirProtected
in thebysequence shown:
copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
1. Tighten bolts -3- to 7 Nm. with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Tighten bolts -4- to 7 Nm.

cardiagn.com
4.2 Removing and installing filler neck for
washer fluid reservoir
Removing
Vehicles up to 05.2008:
– Detach seal -arrow- in section of filler neck for washer fluid
reservoir.
– Unclip plenum chamber cover -3- and detach.

Note

Disregard -items 1 and 2-.

88 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Vehicles from 06.2008 onwards:

– Remove bolts -3-.
– Unclip retaining clips -2- from retainer and detach plenum
chamber cover -1-.

All vehicles (continued):

cardiagn.com
– Unscrew nut -1- and swivel filler neck for washer fluid reservoir
slightly towards rear -arrow A-.
– Detach filler neck -2- with filler pipe from washer fluid reservoir
and remove through opening in body -arrow B-.

Installing
• Tightening torque ⇒ page 87
Installation is carried out in the reverse order; note the following:
– Slide sealing grommet -2- onto filler pipe for filler neck -1- as
far as stop.
• Lug must engage in recess in filler pipe -arrows-.
– Insert filler neck in washer fluid reservoir.

Note

Make sure that the O-ring in the washer fluid reservoir does not
become pinched when inserting.

4.3 Removing and installing washer fluid

reservoir
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Special tools and workshop equipment required
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Drip tray
Removing
– Switch off ignition and take out ignition key.
– Remove filler neck for washer fluid reservoir ⇒ page 88 .
– Remove front wheel (left-side).

4. Windscreen washer system 89

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .

– Place drip tray under washer fluid reservoir.
– Pull release tab and detach hose connector -1- from washer
fluid hose -3- for headlight washer system.
– Cut through cable ties -2- and -4-.
– Detach plastic wedge -5-.

– Unplug electrical connectors -7- and -8-.

– Release retaining clip and disconnect washer fluid hoses from
washer pump -9- for windscreen washer system.
– Detach wiring harness -2- from retainers on washer fluid res‐
ervoir.

cardiagn.com
– Remove bolts -1- and -3-.
– Pull washer fluid reservoir forwards slightly.
– Unplug electrical connector -5-.
– Detach washer fluid hose -6- for headlight washer system and
wiring harness -4- from retainers on washer fluid reservoir.
– Detach washer fluid reservoir.

Installing
• Tightening torque and tightening sequence ⇒ page 88 .
– When installing washer fluid reservoir, make sure that locating
lug -1- engages in recess -2- on wing panel.
Installation is carried out in the reverse order; note the following:
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Install front wheel housing liner (left-side) ⇒ Rep. Gr. unless
permitted 66 . authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install filler neck for washer fluid reservoir ⇒ page 88 .

4.4 Removing and installing washer fluid

level sender -G33-
Special tools and workshop equipment required
♦ Drip tray

90 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Switch off ignition and take out ignition key.
– Remove front wheel (left-side).
– Remove front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .
– Unplug electrical connector -1-.
– Place drip tray under washer fluid reservoir.
– Pull washer fluid level sender -G33- -item 3- out of washer fluid
reservoir -4-.
Installing
Installation is carried Protected
out in the reverse order; note the following:
by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Check sealing grommet -2- for damage.
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Install front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .

4.5 Removing and installing washer pump -

V5-

cardiagn.com
Special tools and workshop equipment required
♦ Drip tray
Removing
– Switch off ignition and take out ignition key.
– Remove front wheel (left-side).
– Remove front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .
– Unplug electrical connector -4-.
– Place drip tray under washer fluid reservoir.
– Release retaining clip -2- in direction of -arrow- and disconnect
washer fluid hose -1- from washer pump for windscreen wash‐
er system.
– Lift washer pump -V5- -item 3- out of washer fluid reservoir.

Note

♦ Renew bracket for washer pump -V5- if damaged.

♦ Using a screwdriver, pry damaged bracket -1- out of retainer
in washer fluid reservoir -2- towards outside of vehicle
-arrow-.

Installing
Installation is carried out in the reverse order; note the following:
– Check sealing grommet for damage.
– Install front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .

4. Windscreen washer system 91

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4.6 Removing and installing washer jets

Removing
– Unclip washer jets -1- from underneath bonnet -arrow-.

– Release retaining clip -3- in direction

Protectedof
by-arrow-
copyright. and disconnect
Copying for private or commercial purposes, in part or in whole, is not
washer fluid hose -2- from windscreen washer
permitted unless jet.by AUDI AG. AUDI AG does not guarantee or accept any liability
authorised
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Unplug electrical connector -1- if fitted.
Installing
Installation is carried out in the reverse order; note the following:

cardiagn.com
– When fitting washer fluid hose, make sure that retaining clip
engages audibly in connection on washer fluid hose.
– Insert washer jet in bonnet.

4.7 Adjusting washer jets

Special tools and workshop equipment required
♦ Adjusting tool for washer jet -T40187- fitted with needle
-3125/5A-
Adjusting

Note

The setting dimensions are calculated to allow for the motion of

the vehicle when driving. When the vehicle is stationary the di‐
rection of the jets will be slightly different.

– Use water-soluble pen to mark six points on windscreen:

Dimension in mm Driver's side Passenger's side
-a- = 310 310
-b- = 580 580
-c- = 360 360
-d- = 360 360
-e- = 550 550
-f- = 180 180

92 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

WARNING

Risk of injury.
♦ When the adjusting tool for washer jet -T40187- is not
used, make sure both sides are always covered and se‐
cured with the covers -3- and -4-.
♦ If one side is not secured with the cover, injuries may be
caused by the needle -3125/5A- -item 1- or the adjusting
pin -2-.
♦ When opening one of the sides, always make sure the
opposite side does not point towards your hand.

– Release long cover -1- on adjusting tool for washer jet -

T40187- -arrow A- and slide towards rear -arrow B-.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Fit adjusting pin -2- onto appropriate washer jet -arrow- of

washer jet unit -1-, aim at the marks previously made on wind‐
screen and adjust if necessary.
– If spray pattern does not match specifications, clean the con‐
taminated washer jet.

WARNING

Risk of injury.
♦ The adjusting pin must be covered and secured with the
cover each time it has been used.

Cleaning washer jet:

– Remove washer jet ⇒ page 92 .
– Rinse washer jet with clear water in opposite direction of spray.
– Always blow through washer jet in opposite direction of spray
when removing remaining particles of dirt by applying com‐
pressed air.
– If spray pattern still does not match specifications, renew the
washer jet.

4. Windscreen washer system 93

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5 Overview of rear window wiper and washer system

1 - Rear window wiper motor -

V12-
❑ Exploded view
⇒ page 95
❑ Removing and installing
⇒ page 97
2 - Washer jet
❑ Exploded view
⇒ page 98
❑ Removing and installing
⇒ page 99
3 - Wiper arm
❑ Exploded view
⇒ page 95
❑ Removing and installing
⇒ page 96

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4 - Washer fluid reservoir
❑ Exploded view
⇒ page 98
❑ Removing and installing
⇒ page 89

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

94 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6 Rear window wiper and washer sys‐

tem

6.1 Exploded view of rear window wiper and rear window wiper motor

1 - Washer fluid hose

❑ For rear window washer
system
2 - Nut
❑ 8 Nm
3 - Rear window wiper motor -
V12-
❑ Removing and installing
⇒ page 97
4 - Rubber seal
❑ Removing and installing

cardiagn.com
⇒ page 98
5 - Wiper arm
❑ Removing and installing
⇒ page 96
6 - Nut
❑ 12 Nm
7 - Washer jet Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
8 - Cover for rear window wiper
with respect to the correctness of information in this document. Copyright by AUDI AG.

9 - Wiper blade
❑ Renewing ⇒ page 95

6.2 Renewing wiper blade

Removing
– Lift wiper arm off rear window.
– Pull wiper blade -1- downwards off wiper arm -2- in direction
of -arrow-.
Installing
Installation is carried out in the reverse order; note the following:
– The wiper blade must engage audibly in the wiper arm.

6. Rear window wiper and washer system 95

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.3 Removing and installing wiper arm

Special tools and workshop equipment required
♦ Tool kit for wiper arms -T10369-

Removing
– Switch on ignition.
– Actuate “rear wiper” and allow wiper arm to move to end po‐

cardiagn.com
sition.
– Switch off ignition and take out ignition key.
– Carefully pry cap apart slightly -arrows- and lift off.

– Carefully detach washer jet -2-. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Slacken securing nut -1- one turn. with respect to the correctness of information in this document. Copyright by AUDI AG.

96 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Place an M6 nut -4- on top of securing nut.

– Apply puller -T10369/1- at wiper arm -1- as shown in illustra‐
tion.
– Apply thrust piece -2- at wiper shaft.
– Turn bolt -3- clockwise until wiper arm is clear of wiper shaft.
– Remove nut and detach wiper arm.
Installing
Installation is carried out in the reverse order; note the following:
– Adjust wiper arm ⇒ page 97 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
6.4 Adjusting wiper arm
with respect to the correctness of information in this document. Copyright by AUDI AG.

Procedure
– Apply wiper arm with wiper blade fitted at wiper shaft and align
wiper blade on rear window as follows.
• Dimension -a- = 19 + 5 mm

cardiagn.com
Note

The dimension indicates distance between tip of wiper blade and

bottom edge of window.

– Tighten nut for wiper arm.

• Tightening torque ⇒ page 95
– Switch on ignition.
– Actuate “rear wiper” and allow wiper arm to move to end po‐
sition.
– Check setting of wiper arm again. Correct as necessary.

6.5 Removing and installing rear window

wiper motor -V12-
Removing
– Remove wiper arm ⇒ page 96 .
– Remove trim at bottom of rear lid ⇒ Rep. Gr. 70 .
– Unplug electrical connector -2-.
– Release retaining clip -arrow A- and pull washer fluid hose
-3- off connecting pipe for washer jet.
– Unscrew nuts -arrows B- and detach rear window wiper motor
-V12- -item 1-.
Installing
• Tightening torque ⇒ page 95
Installation is carried out in the reverse order; note the following:
• Washer fluid hose must engage audibly in washer jet connec‐
tion.
– Install trim at bottom of rear lid ⇒ Rep. Gr. 70 .
– Adjust wiper arm ⇒ page 97 .

6. Rear window wiper and washer system 97

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.6 Removing and installing rubber seal

Removing
– Remove wiper motor ⇒ page 97 .
– Carefully pry rubber seal out of rear window.
Installing
Installation is carried out in the reverse order; note the following:
– Insert rubber seal -2- into rear window -1-.
• Marking -3- should point upwards.
– Install wiper motor ⇒ page 97 .

6.7 Exploded view of washer fluid reservoir, washer fluid hoses, washer jets

cardiagn.com
1 - Washer fluid reservoir
❑ Removing and installing
⇒ page 89
2 - Rear window wiper motor -
V12-
3 - Wiper arm
4 - Washer jet
❑ Removing and installing
⇒ page 99
❑ Adjusting ⇒ page 100
5 - Washer fluid hose
❑ For rear window washer
system
6 - Retaining ring
❑ For washer pump -V5-
7 - Washer pump -V5-
❑ Removing and installing
⇒ page 99
8 - Sealing grommet
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

98 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.8 Removing and installing washer pump -

V5-
Special tools and workshop equipment required
♦ Drip tray
Removing
– Switch off ignition and take out ignition key.
– Remove front wheel (left-side).
– Remove front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .
– Unplug electrical connector -5-.
– Place drip tray under washer fluid reservoir.
– Release retaining clips -3- in direction of -arrows- and discon‐
nect washer fluid hoses -1- and -2- from washer pump.
– Lift washer pump -V5- -item 4- out of washer fluid reservoir.

cardiagn.com
Note

♦ Renew bracket for washer pump -V5- if damaged.

♦ Using a screwdriver, pry damaged bracket -1- out of retainer
in washer fluid reservoir -2- towards outside of vehicle
-arrow-.

Installing
Installation is carried out in the reverse order; note the following:
– Check sealing grommet for damage.
– Install front wheel housing liner (left-side) ⇒ Rep. Gr. 66 .

6.9 Removing and installing washer jet

Removing
– Carefully pry cap apart slightly -arrows- and lift off.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

6. Rear window wiper and washer system 99

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Carefully pull washer jet -2- off connection pipe -arrow-.

Installing
Installation is carried out in the reverse order; note the following:
• Insert washer jet with spray opening pointing into recess on
wiper arm -1-.

6.10 Adjusting washer jet Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Special tools and workshop equipment required
♦ Adjusting tool for washer jet -T40187- fitted with needle
-3125/5A-
Procedure

cardiagn.com
WARNING

Risk of injury.
♦ When the adjusting tool for washer jet -T40187- is not
used, make sure both sides are always covered and se‐
cured with the covers -3- and -4-.
♦ If one side is not secured with the cover, injuries may be
caused by the needle -3125/5A- -item 1- or the adjusting
pin -2-.
♦ When opening one of the sides, always make sure the
opposite side does not point towards your hand.

– Release short cover -1- on adjusting tool for windscreen spray

jet -T40187- -arrow A- and slide towards rear -arrow B-.

100 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Adjust washer jets using adjusting tool -T10127- so that water

jets spray rear window at points indicated.
• Dimension -a- = 150 mm
• Dimension -b- = 10 mm
• Dimension -c- = 300 mm
– If spray pattern does not match specifications, clean the con‐
taminated washer jet.

WARNING

Risk of injury.
♦ The adjusting pin must be covered and secured with the
cover each time it has been used.

Cleaning washer jet:

– Remove washer jet ⇒ page 99 .
– Rinse washer jet with clear water in opposite direction of spray.

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– Always blow through washer jet in opposite direction of spray
when removing remaining particles of dirt by applying com‐
pressed air.
– If spray pattern still does not match specifications, renew the
washer jet.

6.11 Removing and installing washer fluid

reservoir

Note

The washer fluid reservoir supplies both the windscreen and the
rear window wash systems; it is located in the rear left wheel
housing. Removing and installing ⇒ page 89 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

6. Rear window wiper and washer system 101

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7 Headlight washer system

7.1 Exploded view of washer fluid reservoir, washer fluid hoses, washer jets

1 - Right washer jet

❑ Removing and installing
⇒ page 103
2 - Mounting (right-side)
❑ For washer jet and
headlight
3 - Washer hose
❑ For washer jet (right-
side)
❑ Attached to bumper with
cable tie
4 - Mounting (left-side)

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❑ For washer jet and
headlight
5 - Washer fluid reservoir
6 - Headlight washer system
pump -V11-
❑ Removing and installing
⇒ page 102
7 - Sealing grommet
❑ For headlight washer
system pump -V11-
8 - Fluid hose
❑ From headlight washer
system pump -V11-
9 - Washer hose
❑ To washer jets
10 - Left washer jet
❑ Removing and installing
⇒ page 103
11 - Washer hose
❑ For washer jet (left-side)
12 - Bumper

7.2 Removing and installing headlight

washer system pump -V11-
Special tools and workshop equipment required

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

102 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Hose clip pliers -V.A.G 1921-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
♦with Drip
respecttray
to the correctness of information in this document. Copyright by AUDI AG.

Removing
– Unfasten washer fluid reservoir ⇒ page 89 and lift until head‐
light washer system pump -V11- just becomes accessible.
– Place drip tray under washer fluid reservoir.
– Unplug electrical connector -1-.

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– Detach washer hose -3- from headlight washer system pump
-V11- .
– Lift washer pump -V11- -item 2- out of washer fluid reservoir.
Installing
Installation is carried out in the reverse order; note the following:

Note

Secure all hose connections with the correct type of hose clips
(same as original equipment) ⇒ Electronic parts catalogue .

– Check sealing grommet for damage.

– Install washer fluid reservoir ⇒ page 89 .

7.3 Removing and installing headlight

washer jets
Special tools and workshop equipment required
♦ Hose clamps up to 25 mm -3094-

7. Headlight washer system 103

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Remove relevant front wheel housing liner ⇒ Rep. Gr. 66 .
– Disconnect fluid hose -1- using hose clamp -3094- .

Note Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Place a cloth underneath to catch escaping fluid.

– Pull release tab and detach washer fluid hose -5-.

– Press retaining springs -1- and -2- on washer jet upwards to

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release and at the same time take washer jet -4- out of retainer
-3- towards rear -arrow-.

Installing
Installation is carried out in the reverse order; note the following:
– Retaining springs -3- and -4- on washer jet -2- will not engage
audibly unless side guide -1- is correctly inserted in retainer
-5-.
– Install front wheel housing liner ⇒ Rep. Gr. 66 .

7.4 Adjusting washer jets

Note

The washer jets are pre-set at the factory and do not have to be
adjusted following installation.

7.5 Removing and installing washer fluid

reservoir

Note

The washer fluid reservoir supplies both the windscreen and

headlight washer systems; it is located in the rear left wheel hous‐
ing. Removing and installing ⇒ page 89 .

104 Rep. Gr.92 - Windscreen wash/wipe system

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

8 Washer fluid hoses

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 92 :
♦ Disconnecting and connecting washer fluid hose connectors
♦ Servicing a washer fluid hose with corrugated tube

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

8. Washer fluid hoses 105

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

94 – Lights, bulbs, switches - exterior

1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers, etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
Furthermore, rubber components or plastic components and ad‐
hesives are made of non-conductive material.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Always fit new components ifwithyou areto not
respect sure that
the correctness the oldincom‐
of information this document. Copyright by AUDI AG.
ponents are suitable ⇒ Electronic parts catalogue .
Note:
♦ We recommend the use of genuine replacement parts only;
they have been tested and are compatible with aluminium.
♦ We recommend using Audi Genuine Accessories.
♦ Damage resulting from contact corrosion is not covered by

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warranty.

106 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2 Halogen headlights
Observe notes on contact corrosion ⇒ page 106 .

Note

The headlights must be adjusted after any repair work which

could affect the headlight settings ⇒ page 140 .

2.1 Exploded view of halogen headlight

Part 1

1 - Headlight washer jet

2 - Bolt
❑ 8 Nm
3 - Bracket
❑ For mounting for head‐

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light housing
4 - Breather
❑ For headlight housing
5 - Bolt
❑ 8 Nm
6 - Bolt
❑ 8 Nm
7 - Breather hose
❑ For headlight housing
8 - Bracket for headlight hous‐
ing
9 - Bolt
❑ 1.8 Nm
10 - Bolt
❑ 4.5 Nm
11 - Bolt
❑ 4.5 Nm
12 - Stop bolt
13 - Bracket for headlight
housing
14 - Bolt
❑ 4.5 Nm
15 - Speed
Protected nutCopying for private or commercial purposes, in part or in whole, is not
by copyright.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
16
with-respect
Headlight main beam
to the correctness bulbin this document. Copyright by AUDI AG.
of information

❑ Left headlight main beam bulb -M30-

❑ Right headlight main beam bulb -M32-
❑ 12 V, 55 W (H7)
❑ Renewing bulbs ⇒ page 114
17 - Housing cover
❑ For headlight main beam

2. Halogen headlights 107

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

18 - Housing cover
❑ For headlight dipped beam
19 - Headlight dipped beam bulb
❑ Left headlight dipped beam bulb -M29-
❑ Right headlight dipped beam bulb -M31-
❑ 12 V, 55 W (H7)
❑ Renewing bulbs ⇒ page 113
20 - Headlight housing
❑ USA vehicles: The front side marker light bulb (LED) is integrated in the headlight housing. The LED light
cannot be renewed separately; the headlight must be renewed as a complete unit
❑ Removing and installing ⇒ page 110
21 - Bolt
❑ 4.5 Nm
22 - Speed nut
23 - Bolt
❑ 4.5 Nm

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24 - Speed nut
25 - Mounting
❑ For headlight housing
❑ Removing and installing ⇒ page 112
26 - Bolt Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ 4.5 Nm with respect to the correctness of information in this document. Copyright by AUDI AG.

27 - Bolt
❑ Tightening torque ⇒ Rep. Gr. 69
28 - Front airbag crash sensor
❑ Removing and installing ⇒ Rep. Gr. 69

Part 2 - repair kits

108 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

1 - Headlight housing
❑ Removing and installing
⇒ page 110
2 - Front turn signal bulb
❑ Front left turn signal
bulb -M5-
❑ Front right turn signal
bulb -M7-
❑ 12 V, 24 W - yellow
❑ Renewing bulbs
⇒ page 117
3 - Seal
❑ Not available as individ‐
ual replacement part
4 - Housing cover for turn sig‐
nal
❑ Before renewing bulb,
headlight housing must
be cut open

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❑ For subsequent sealing
of assembly
Protected byopening,
copyright. Copying for private or commercial purposes, in part or in whole, is not
housing cover
permitted is authorised
unless availa‐ by AUDI AG. AUDI AG does not guarantee or accept any liability
ble ⇒ Electronic parts
with respect to the correctness of information in this document. Copyright by AUDI AG.
catalogue
❑ Removing and installing
⇒ “2.9 Renewing front
turn signal bulb M5 / M7
”, page 117
5 - Bolt
❑ From repair kit for turn
signal cover
❑ 2 Nm
6 - Headlight range control mo‐
tor
❑ Left headlight range control motor -V48- ; removing and installing ⇒ page 118
❑ Right headlight range control motor -V49- ; not available as an individual replacement part
7 - Seal
❑ Not available as individual replacement part
8 - Housing cover for headlight range control motor
❑ Only for headlight (left-side)
❑ Before renewing control motor, headlight housing must be cut open
❑ For subsequent sealing of assembly opening, housing cover is available ⇒ Electronic parts catalogue
❑ Removing and installing
⇒ “2.10 Removing and installing left headlight range control motor V48 ”, page 118
9 - Bolt
❑ From repair kit for cover for headlight range control motor
❑ 2 Nm
10 - Bolt
❑ 1.4 Nm
11 - Housing cover for side lights/daytime running lights
❑ Before renewing bulb, headlight housing must be cut open
❑ For subsequent sealing of assembly opening, housing cover is available ⇒ Electronic parts catalogue
❑ Removing and installing ⇒ “2.6 Renewing daytime running light bulb (front) L174 / L175 ”, page 114

2. Halogen headlights 109

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

12 - Daytime running light bulb

❑ Left daytime running light bulb -L174-
❑ Right daytime running light bulb -L175-
❑ 12 V, 13 W
❑ Renewing bulbs ⇒ page 115
13 - Side light/daytime running light bulb
❑ Left side light bulb -M1-
❑ Right side light bulb -M3-
❑ With daytime running lights
❑ Side light, 70% dimmed
❑ 12 V, 13 W
❑ Renewing bulbs ⇒ page 114
14 - Housing cover for side lights/daytime running lights
❑ Before renewing bulb, headlight housing must be cut open
❑ For subsequent sealing of assembly opening, housing cover is available ⇒ Electronic parts catalogue
❑ Removing and installing ⇒ “2.7 Renewing side light bulb M1 / M3 ”, page 115

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
2.2 Removing and installing headlight hous‐
ing
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Remove bolts -1, 2, 3, 5- for fasteners.
– Lift cover -4- on lock carrier -arrow- and detach from radiator
grille.

– Unplug electrical connector -2-.

– Remove bolts -3, 4, 5- at headlight housing -1-.

110 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Pull headlight housing -1- towards front -arrow A- until head‐

light guides have been guided out of mountings on mounting
support.
– Then swivel headlight housing towards wing end -arrow B- and
detach from mounting support.

Installing
• Tightening torque ⇒ page 107
Installation is carried out in the reverse order; note the following:
– Position outer edge of headlight housing -1- on inside behind
wing.
– Swivel headlight housing inwards -arrow A-; guide rails -2- on

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headlight housing should engage in guides on mounting -3-
-arrows-.
– Slide headlight housing towards rear as far as stop into mount‐
ing for headlight housing -arrow B-.
• Do not use force when inserting headlight housing in mounting
for headlight housing and make sure it engages smoothly.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– When inserting headlight -4-, make sure that breather -3- for
headlight is pushed evenly onto mounting -2- for breather hose
-1- in direction of -arrow-.

2. Halogen headlights 111

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Tighten bolts -3, 4, 5-.

2.3 Removing and installing mounting for

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headlight housing
Removing
– Remove headlight housing ⇒ page 110 .
– Remove relevant front wheel housing liner ⇒ Rep. Gr. 66 .
– Remove bolts -arrows-.
– Detach mounting -1- for headlight housing.
Installing
• Tightening torque ⇒ page 107
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Insert mounting for headlight housing and screw in unless
permitted boltsauthorised by AUDI AG. AUDI AG does not guarantee or accept any liability
-arrows- hand-tight. with respect to the correctness of information in this document. Copyright by AUDI AG.

– Install headlight housing ⇒ page 110 .

– Slacken bolt -2- for bracket -3- a few turns.
– Align gap widths of headlight housing -1- in relation to body
contour.
• Gap width = gaps must be uniform.

112 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Secure bolts -arrows- and at the same time align headlight

housing flush with outer edge of wing panel.
– Check gap widths again; if necessary repeat adjustment of
gap widths as described above.
– Install wheel housing liner ⇒ Rep. Gr. 66 .
– Adjust headlights ⇒ page 140 .

2.4 Renewing headlight dipped beam bulb -

M29- / -M31-
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.

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– Remove headlight housing ⇒ page 110 .
– Detach cover -1- for dipped beam from headlight housing
-arrow A-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Remove bulb -3- from spring clips -arrows B-. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Unplug electrical connector -2- at bulb.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in housing; do not touch glass part of bulb with
bare hands.
– Push bulb beyond resistance of spring clips into housing.
– Plug in connector and close housing cover.
– Install headlight housing ⇒ page 110 .

2. Halogen headlights 113

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.5 Renewing headlight main beam bulb -

M30- / -M32-
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Remove headlight housing ⇒ page 110 .
– Detach cover -1- for main beam from headlight housing
-arrow A-.
– Remove bulb -3- from spring clips -arrows B-.
– Unplug electrical connector -2- at bulb.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in housing; do not touch glass part of bulb with
bare hands.
– Position bulb at lower spring clip.

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– Push bulb beyond resistance of upper spring clips into hous‐
ing.
– Plug in connector and close housing cover.
– Install headlight housing ⇒ page 110 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

2.6 Renewing daytime running light bulb

permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
(front) -L174- / -L175-
Special tools and workshop equipment required
♦ Protective gloves
♦ Safety goggles
♦ Carpet cutter
Removing
– Remove headlight housing ⇒ page 110 .

Note

♦ Before renewing daytime running light bulb, headlight housing

must be cut open at specified location with a sharp carpet cut‐
ter.
♦ For subsequent sealing of assembly opening, housing cover
is available ⇒ Electronic parts catalogue

WARNING

Risk of injury and damage.

♦ Wear protective gloves and safety goggles.
♦ To prevent damage to electrical wiring in headlight hous‐
ing, do not cut too deep.

114 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Cut dummy cover -1- out of headlight housing using a sharp

carpet cutter.

Note

Thoroughly remove metal particles and abrasion (caused by re‐

moving dummy cover) from of headlight housing.

– Turn bulb holder -2- anti-clockwise -arrow- and pull it out of

housing.

– Release retaining spring -arrow- and unplug electrical con‐

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nector -2- at bulb holder -1-.

Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb holder with bulb into headlight, taking care not
to touch glass bulb with bare hands.
– Close opening in headlight with housing
Protected coverCopying
by copyright. -1- from repair
for private or commercial purposes, in part or in whole, is not
kit ⇒ Electronic parts catalogue .
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install headlight housing ⇒ page 110 .

2.7 Renewing side light bulb -M1- / -M3-

Special tools and workshop equipment required
♦ Protective gloves
♦ Safety goggles
♦ Carpet cutter
Removing
– Remove headlight housing ⇒ page 110 .

2. Halogen headlights 115

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Note

♦ Before renewing side light bulb, headlight housing must be cut

open at specified location with a sharp carpet cutter.
♦ For subsequent sealing of assembly opening, housing cover
is available ⇒ Electronic parts catalogue

WARNING

Risk of injury and damage.

♦ Wear protective gloves and safety goggles.
♦ To prevent damage to electrical wiring in headlight hous‐
ing, do not cut too deep.

– Cut dummy cover -2- out of headlight housing using a sharp

carpet cutter.
– Turn bulb holder -1- anti-clockwise -arrow- and pull it out of

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housing.

– Release retaining spring -arrow- and unplug electrical con‐

nector -2- at bulb holder -1-.

Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb holder with bulb into headlight, taking care not
to touch glass bulb with bare hands.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Close opening in headlight with housingpermitted
cover -1- from repair
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

kit ⇒ Electronic parts catalogue .

with respect to the correctness of information in this document. Copyright by AUDI AG.

– Install headlight housing ⇒ page 110 .

116 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.8 Renewing front side marker light bulb -

M33- / -M34-
The front side marker light bulb (LED) is integrated in the head‐
light housing. The LED light cannot be renewed separately; the
headlight must be renewed as a complete unit.
– Renew headlight housing ⇒ page 110 .

2.9 Renewing front turn signal bulb -M5- / -

M7-
Special tools and workshop equipment required
♦ Protective gloves
♦ Safety goggles
♦ Carpet cutter Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Removing with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove headlight housing ⇒ page 110 .

cardiagn.com
Note

♦ Before renewing front turn signal bulb, headlight housing must

be cut open at specified location with a sharp carpet cutter.
♦ For subsequent sealing of assembly opening, housing cover
is available ⇒ Electronic parts catalogue

WARNING

Risk of injury and damage.

♦ Wear protective gloves and safety goggles.
♦ To prevent damage to electrical wiring in headlight hous‐
ing, do not cut too deep.

– Cut dummy cover -2- out of headlight housing using a sharp

carpet cutter.
– Detach cover -1- for main beam from headlight housing.

2. Halogen headlights 117

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Turn bulb holder -1- anti-clockwise -arrow- and pull it out of

housing.
– Slide holder for turn signal bulb -2- upwards towards opening
for main beam light.
– Unplug electrical connector -3- and take bulb holder out of
housing.

Installing

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• Tightening torque ⇒ page 107
Installation is carried out in the reverse order; note the following:
– Insert new bulb holder with bulb into headlight, taking care not
to touch glass bulb with bare hands.
– Close opening in headlight with housing cover -1- from repair
kit ⇒ Electronic parts catalogue .
– Tighten bolts -arrows-.
– Install headlight housing ⇒ page 110 .

2.10 Removing and installing left headlight

range control motor -V48-
Special tools and workshop equipment required
♦ Protective gloves
♦ Safety goggles
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
♦ Carpet cutter permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Removing
– Remove headlight housing ⇒ page 110 .

Note

♦ Before renewing left headlight range control motor -V48- ,

headlight housing must be cut open at specified location with
a sharp carpet cutter.
♦ For subsequent sealing of assembly opening, housing cover
is available ⇒ Electronic parts catalogue

118 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

WARNING

Risk of injury and damage.

♦ Wear protective gloves and safety goggles.
♦ To prevent damage to electrical wiring in headlight hous‐
ing, do not cut too deep.

– Cut dummy cover -1- out of headlight housing using a sharp

carpet cutter.

Note

Thoroughly remove metal particles and abrasion (caused by re‐

moving dummy cover) from of headlight housing.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
– Cut dummy cover -2- out of headlight housing using a sharp
carpet cutter.

Note

Thoroughly remove metal particles and abrasion (caused by re‐

moving dummy cover) from of headlight housing.

– Detach cover -3- for dipped beam from headlight housing.

– Unscrew bolts -arrows- at headlight range control motor -1-.

2. Halogen headlights 119

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Pull reflector -4- towards rear and swivel headlight range con‐
trol motor -3- upwards -arrow-; this disengages ball head -2-
on actuator shaft downwards out of ball head mounting -1-.
Installing
• Tightening torque ⇒ page 107
Installation is carried out in the reverse order; note the following:
– When inserting, plug in electrical connector.
– Pull reflector towards rear and engage ball head on actuator
shaft in ball head mounting of reflector.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Close opening in headlight with housing cover -1- from repair

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kit ⇒ Electronic parts catalogue .
– Tighten bolts -arrows-.

– Close opening in headlight with housing cover -1- from repair

kit ⇒ Electronic parts catalogue .
– Install headlight housing ⇒ page 110 .

2.11 Removing and installing right headlight

range control motor -V49-
If right headlight range control motor -V49- at headlight (right-
side) is defective, the headlight must be renewed as a complete
unit.
– Renew headlight housing ⇒ page 110 .

2.12 Adjusting headlights from right-hand

traffic to left-hand traffic
♦ In countries where vehicles are driven on the opposite side of
the road to the vehicle's normal environment, both headlights
must be partially masked by appropriately shaped opaque
masking foils to prevent oncoming traffic from being dazzled.

120 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ There are different masking foils available for adapting head‐

lights for left and right-hand traffic (adhesive elements for
headlight lens) ⇒ Electronic parts catalogue .
Procedure

Note

The masking foil has a projection (marking foil) which must be

applied around the edge of the headlight lens so that the masking
foil covers the asymmetrical area of the dipped beam headlights.

– Thoroughly clean the headlight lenses on both sides of vehicle

(must be clean and dry).
Headlight (driver's side):
– Remove protective backing from masking foil.
– Apply the masking foil flush around the edge -2- of the head‐
light lens.
– Adhere the masking foil on the headlight lens, as shown in
illustration.

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– Separate marking foil -3- from masking foil -1- at perforation
-arrow- and then remove again from headlight lens.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Headlight (passenger's side):
– Remove protective backing from masking foil.
– Apply the masking foil flush around the edge -3- of the head‐
light lens.
– Adhere the masking foil on the headlight lens, as shown in
illustration.
– Separate marking foil -2- from masking foil -1- at perforation
-arrow- and then remove again from headlight lens.

2.13 Adjusting headlights from left-hand traf‐

fic to right-hand traffic
♦ In countries where vehicles are driven on the opposite side of
the road to the vehicle's normal environment, both headlights
must be partially masked by appropriately shaped opaque
masking foils to prevent oncoming traffic from being dazzled.
♦ There are different masking foils available for adapting head‐
lights for left and right-hand traffic (adhesive elements for
headlight lens) ⇒ Electronic parts catalogue .
Procedure

Note

The masking foil has a projection (marking foil) which must be

applied around the edge of the headlight lens so that the masking
foil covers the asymmetrical area of the dipped beam headlights.

2. Halogen headlights 121

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Thoroughly clean the headlight lenses on both sides of vehicle

(must be clean and dry).
Headlight (driver's side):
– Remove protective backing from masking foil.
– Apply the masking foil flush around the edge -2- of the head‐
light lens.
– Adhere the masking foil on the headlight lens, as shown in
illustration.
– Separate marking foil -1- from masking foil -3- at perforation
-arrow- and then remove again from headlight lens.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Headlight (passenger's side):
– Remove protective backing from masking foil.
– Apply the masking foil flush around the edge -2- of the head‐
light lens.

cardiagn.com
– Adhere the masking foil on the headlight lens, as shown in
illustration.
– Separate marking foil -3- from masking foil -1- at perforation
-arrow- and then remove again from headlight lens.

122 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3 Bi-xenon gas discharge headlights

with adaptive light
Observe notes on contact corrosion ⇒ page 106 .

Note

The headlights must be adjusted after any repair work which

could affect the headlight settings ⇒ page 140 .

3.1 Safety precautions when handling gas

discharge bulbs
⇒ Electrical system; General information; Rep. Gr. 94

3.2 Exploded view of bi-xenon gas discharge headlight with adaptive light
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Part 1 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
1 - Headlight washer jet
2 - Bolt
❑ 8 Nm
3 - Bracket
❑ For mounting for head‐
light housing
4 - Breather
❑ For headlight housing
5 - Bolt
❑ 8 Nm
6 - Bolt
❑ 8 Nm
7 - Breather hose
❑ For headlight housing
8 - Output module
❑ Only vehicles with adap‐
tive light
❑ Output module for left
headlight -J667-
❑ Output module for right
headlight -J668-
❑ Removing and installing
⇒ page 132
9 - Bracket for headlight hous‐
ing
10 - Bolt
❑ 1.8 Nm
11 - Seal
12 - Gas discharge bulb control
unit
❑ Left gas discharge bulb control unit -J343-
❑ Right gas discharge bulb control unit -J344-

3. Bi-xenon gas discharge headlights with adaptive light 123

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

❑ Removing and installing ⇒ page 130

13 - Bolt
❑ 1.4 Nm
14 - Bolt
❑ 1.4 Nm
15 - LED module for daytime running lights and side lights
❑ LED module (left-side) for daytime running light and side light -L176-
❑ LED module (right-side) for daytime running light and side light -L177-
❑ Removing and installing ⇒ page 131
16 - Front turn signal bulb
❑ Front left turn signal bulb -M5-
❑ Front right turn signal bulb -M7-
❑ 12 V, 21 W (H21W)
❑ Renewing bulbs ⇒ page 130
17 - Bolt
❑ 4.5 Nm

cardiagn.com
18 - Stop bolt
19 - Bracket for headlight housing
20 - Bolt
❑ 4.5 Nm
21 - Speed nut
22 - Gas discharge bulb
❑ With integrated starter unit
❑ Left gas discharge (xenon) bulb -L13-
❑ Right gas discharge (xenon) bulb -L14-
❑ 42 V, 35 W (D3S)
❑ Renewing bulbs ⇒ page 129
23 - Housing cover
❑ For dipped beam headlights
24 - Headlight housing
❑ The daytime running light and side light bulbs (LED lights) are integrated in the headlight housing. The
LED lights cannot be renewed separately; the headlight must be renewed as a complete unit
❑ USA vehicles: The front side marker light bulb (LED) is integrated in the headlight housing. The LED light
cannot be renewed separately; the headlight must be renewed as a complete unit
❑ Removing and installing ⇒ page 126
25 - Bolt
❑ 1.4 Nm
26 - Bolt
❑ 4.5 Nm
27 - Speed nut
28 - Bolt
❑ 4.5 Nm
29 - Speed nut
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
30 - Mountingpermitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ For headlight housing
❑ Removing and installing ⇒ page 128

124 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

31 - Bolt
❑ 4.5 Nm
32 - Bolt
❑ Tightening torque ⇒ Rep. Gr. 69
33 - Front airbag crash sensor
❑ Removing and installing ⇒ Rep. Gr. 69

Part 2 - repair kits

1 - Headlight housing
❑ Removing and installing
⇒ page 126
2 - Headlight range control mo‐
tor
❑ Left headlight range
control motor -V48-
❑ Right headlight range

cardiagn.com
control motor -V49-
❑ Removing and installing
⇒ page 133
3 - Seal
❑ Not available as individ‐
ual replacement part
4 - Housing cover for control
motor
❑ Combined with head‐
light housing as original
equipment. Renew Protected
sep‐ by copyright. Copying for private or commercial purposes, in part or in whole, is not
arately when performing
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
repair work; repair kit with
⇒ respect to the correctness of information in this document. Copyright by AUDI AG.
Electronic parts cata‐
logue
❑ Removing and installing
⇒ “3.14 Removing and
installing headlight
range control motor
V48 / V49 ”, page 133
5 - Bolt
❑ From repair kit for cover
for headlight range con‐
trol motor
❑ 2 Nm
6 - Bolt
❑ 1.4 Nm

3. Bi-xenon gas discharge headlights with adaptive light 125

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.3 Removing and installing headlight hous‐

ing

WARNING

High voltage! Danger to life!

♦ Safety precautions when handling gas discharge bulbs ⇒
Electrical system; General information; Rep. Gr. 94 .

Removing Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– With ignition switched off, disconnect permitted
earth cable at battery
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
⇒ page 5 .
– Remove bolts -1, 2, 3, 5- for fasteners.
– Lift cover -4- on lock carrier -arrow- and detach from radiator
grille.

cardiagn.com
– Unplug electrical connector -2-.
– Remove bolts -3, 4, 5- at headlight housing -1-.

– Pull headlight housing -1- towards front -arrow A- until head‐

light guides have been guided out of mountings on mounting
support.
– Then swivel headlight housing towards wing end -arrow B- and
detach from mounting support.

126 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torque ⇒ page 107
Installation is carried out in the reverse order; note the following:
– Position outer edge of headlight housing -1- on inside behind
wing.
– Swivel headlight housing inwards -arrow A-; guide rails -2- on
headlight housing should engage in guides on mounting -3-
-arrows-.
– Slide headlight housing towards rear as far as stop into mount‐
ing for headlight housing -arrow B-.
• Do not use force when inserting headlight housing in mounting
for headlight housing and make sure it engages smoothly.

– When inserting headlight -4-, make sure that

permitted unlessbreather
authorised by-3-
AUDIfor
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
AG. AUDI AG does not guarantee or accept any liability

cardiagn.com
headlight is pushed evenly onto mounting -2- for
with respect breather
to the correctnesshose
of information in this document. Copyright by AUDI AG.
-1- in direction of -arrow-.

– Tighten bolts -3, 4, 5-.

– Connect battery. Steps required ⇒ page 6 .

3. Bi-xenon gas discharge headlights with adaptive light 127

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.4 Removing and installing mounting for

headlight housing
Removing

WARNING

High voltage! Danger to life!

♦ Safety precautions when handling gas discharge bulbs ⇒
Electrical system; General information; Rep. Gr. 94 .

– Remove headlight housing ⇒ page 126 .

– Remove relevant wheel housing liner ⇒ Rep. Gr. 66 .
– Remove bolts -arrows-.
– Detach mounting -1- for headlight housing.
Installing
• Tightening torque ⇒ page 123

cardiagn.com
– Insert mounting for headlight housing and screw in bolts
-arrows- hand-tight.

– Install headlight housing ⇒ page 126 .

– Slacken bolt -2- for bracket -3- a few turns.
– Align gap widths of headlight housing -1- in relation
Protected to body
by copyright. Copying for private or commercial purposes, in part or in whole, is not
contour. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• Gap width = gaps must be uniform.

– Secure bolts -arrows- and at the same time align headlight

housing flush with outer edge of wing panel.
– Check gap widths again; if necessary repeat adjustment of
gap widths as described above.
– Install wheel housing liner ⇒ Rep. Gr. 66 .
– Adjust headlights ⇒ page 140 .

128 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.5 Renewing gas discharge bulb -L13- / -

L14-

WARNING

High voltage! Danger to life! Observe environmental require‐

ments.
♦ Safety precautions when handling gas discharge bulbs ⇒
Electrical system; General information; Rep. Gr. 94 .

Removing
– Remove headlight housing ⇒ page 126 .
– Release housing cover -1- for gas discharge bulb by turning
anti-clockwise -arrow- and detach from headlight housing.

cardiagn.com
– Turn gas discharge bulb -2- in direction of -arrow- and take out
of housing.
– Unplug electrical connector -1-.
Installing
Installation is carried out in the reverse order; note the following:
– byPlug
Protected connector
copyright. in again
Copying for private and insert
or commercial new
purposes, gas
in part or indischarge
whole, is not bulb in
housing;
permitted unless dobynot
authorised AUDItouch
AG. AUDI glass
AG does part of bulborwith
not guarantee acceptbare hands.
any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• Installation position: The electrical connection faces down‐
wards.

– Close housing cover by turning clockwise.

• Mark -2- on headlight housing and arrow -1- on housing cover
must be aligned.
– Install headlight housing ⇒ page 126 .

3.6 Renewing LED module for daytime run‐

ning light and side light -L176- / -L177-
The daytime running light and side light bulbs (LED lights) are
integrated in the headlight housing. The LED lights cannot be re‐
newed separately; the headlight must be renewed as a complete
unit.
– Renew headlight housing ⇒ page 126 .

3. Bi-xenon gas discharge headlights with adaptive light 129

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.7 Renewing front side marker light bulb -

M33- / -M34-
The front side marker light bulb (LED) is integrated in the head‐
light housing. The LED light cannot be renewed separately; the
headlight must be renewed as a complete unit.
– Renew headlight housing ⇒ page 126 .

3.8 Removing and installing dip beam

screen -V294- / -V295-
The dip beam screen is located in the headlight housing and can‐
not be renewed separately in the event of a fault.
– Renew headlight housing ⇒ page 126 .

3.9 Renewing front turn signal bulb -M5- / -

M7-
Removing
– Remove gas discharge bulb control unit ⇒ page 130 .

cardiagn.com
– Remove LED module for daytime running lights and side lights
⇒ page 131 .
– Insert long-nose pliers in opening for gas discharge bulb con‐
trol unit and turn bulb holder -1- anti-clockwise -arrow- and pull
bulb holder out of mounting.
– Take bulb holder out through opening for LED module for day‐
time running lights and side lights.
– Unplug electrical connector and detach bulb holder.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb holder with bulb into headlight, taking care not
to touch glass bulb with bare hands.
– Install LED module for daytime running lights and side lights
⇒ page 130 .
– Install gas discharge bulb control unit ⇒ page 130 .

3.10 Removing and installing left/right gas

discharge bulb control unit -J343- / -
J344-

WARNING

High voltage! Danger to life!

♦ Always disconnect the battery earth cable before working
on parts of the gas discharge headlights marked with yel‐
low high-voltage warning symbols.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

130 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Remove headlight housing ⇒ page 126 .
– Remove bolts -arrows-.
– Pull control unit -1- off headlight housing.
– Disconnect adapter cable -3- and electrical connector -4- at
gas discharge bulb control unit.
– Detach gas discharge bulb control unit.
Installing
• Tightening torque ⇒ page 123
Installation is carried out in the reverse order; note the following:
– Check seal -2- between gas discharge bulb control unit and
headlight housing for damage.
– Install headlight housing ⇒ page 126 .

3.11 Removing and installing LED module for

cardiagn.com
daytime running lights and side lights -
L176- / -L177-

WARNING

High voltage! Danger to life!

♦ Safety precautions when handling gas dischargeProtected
bulbsby⇒copyright. Copying for private or commercial purposes, in part or in whole, is not
Electrical system; General information; Rep. Gr.permitted
94 . unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Removing
– Remove headlight housing ⇒ page 126 .
– Unscrew bolts -arrows-.
– Pull LED module -1- for daytime running light and side light off
headlight housing.

3. Bi-xenon gas discharge headlights with adaptive light 131

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Release retaining clip -arrow B- and unplug electrical wire

-4-.
– Release retaining clip -arrow A- and unplug electrical wire
-3-.
– Remove LED module for daytime running light and side light.
Installing
• Tightening torque ⇒ page 123
Installation is carried out in the reverse order; note the following:
– Check seal -1- between LED module and headlight housing.
– Install headlight housing ⇒ page 126 .

3.12 Removing and installing output module

cardiagn.com
for headlight -J667- / -J668-

WARNING

High voltage! Danger to life!

♦ Safety precautions when handling gas discharge bulbs ⇒
Electrical system; General information; Rep. Gr. 94 .

Removing
– Remove headlight housing ⇒ page 126 .
– Unscrew bolts Protected
-arrows- at output
by copyright. module
Copying -1-or for
for private headlight.
commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

132 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Pull output module -2- for headlight off headlight housing -1-.
– Unplug electrical connector -3-.
Installing
• Tightening torque ⇒ page 123
Installation is carried out in the reverse order; note the following:
– Check seal between output module and headlight housing.
– Install headlight housing ⇒ page 126 .

3.13 Removing and installing dynamic cor‐

cardiagn.com
nering light control motor -V318- / -
V319-
The dynamic cornering light control motor is located in the head‐
light housing and cannot be renewed separately in the event of a
fault.
– Renew headlight housing ⇒ page 126 .

3.14 Removing and installing headlight range

control motor -V48- / -V49-
Special tools and workshop equipment required
♦ Protective gloves
♦ Safety goggles
♦ Carpet cutter

WARNING

High voltage! Danger to life! Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
♦ Safety precautions when handling gas discharge bulbs ⇒
with respect to the correctness of information in this document. Copyright by AUDI AG.
Electrical system; General information; Rep. Gr. 94 .

Removing
– Remove headlight housing ⇒ page 126 .

Note

♦ Before renewing control motor, headlight housing must be cut

open at specified location with a sharp carpet cutter.
♦ For subsequent sealing of assembly opening, housing cover
is available ⇒ Electronic parts catalogue

3. Bi-xenon gas discharge headlights with adaptive light 133

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

WARNING

Risk of injury and damage.

♦ Wear protective gloves and safety goggles.
♦ To prevent damage to electrical wiring in headlight hous‐
ing, do not cut too deep.

– Cut dummy cover -1- out of headlight housing using a sharp

carpet cutter.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

Thoroughly remove metal particles and abrasion (caused by re‐

moving dummy cover) from of headlight housing.

– Unscrew bolts -arrows- at control motor -2-.

cardiagn.com
– Remove LED module for daytime running lights and side lights
⇒ page 131 .
– Reach through opening for LED module for daytime running
lights and side lights and press ball head mounting -3- towards
rear.
– Press ball head of actuator shaft out of its mounting by swiv‐
elling control motor -1- downwards.
– Remove control motor from headlight housing.
– Unplug electrical connector -2-.
Installing
• Tightening torque ⇒ page 123
Installation is carried out in the reverse order; note the following:
– Start by inserting ball head of actuator shaft in mounting on
reflector from below; to do so, pull reflector to rear.

134 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Close opening in headlight with housing cover -1- from repair

kit ⇒ Electronic parts catalogue .
– Tighten bolts -arrows-.
– Install headlight housing ⇒ page 126 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
3.15 Converting headlights for driving on the with respect to the correctness of information in this document. Copyright by AUDI AG.

left or right side of the road

When travelling in countries where the vehicle is to be driven on
the other side of the road, both headlights must be adjusted to
prevent oncoming traffic from being dazzled by the asymmetric
dipped beams.
Procedure

cardiagn.com
– The headlights are adapted for driving on the left or right via
the multimedia system operating unit in the menu option Ex‐
terior lighting “Headlamp converter” ⇒ Owner's Manual .
– The headlights can also be adapted for driving on the left or
right in the “Guided Functions” mode ⇒ Vehicle diagnosis,
testing and information system VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code
55 Dynamic headlight range control (with AFS)
J431
55 Headlamp converter (Repair Group 94)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.

3. Bi-xenon gas discharge headlights with adaptive light 135

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4 Automatic headlight range control

4.1 Overview of automatic headlight range control

1 - Right headlight range con‐

trol motor -V49-
❑ Removing and installing
⇒ page 133
2 - Control unit
❑ Fitting location: beneath
air intake chamber
❑ Removing and installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with⇒ page
respect 136
to the correctness of information in this document. Copyright by AUDI AG.

On vehicles without adaptive

lights
❑ Control unit for head‐
light range control -

cardiagn.com
J431-
On vehicles with adaptive
lights
❑ Cornering light and
headlight range control
unit -J745-
3 - Electrical connector
4 - Rear left vehicle level send‐
er -G76-
❑ Fitting location: on sus‐
pension link (rear left)
❑ Removing and installing
⇒ Rep. Gr. 42
5 - Front left vehicle level send‐
er -G78-
❑ Fitting location: on sus‐
pension link (front left)
❑ Removing and installing
⇒ Rep. Gr. 40
6 - Left headlight range control motor -V48-
❑ Removing and installing ⇒ page 133

4.2 Removing and installing control unit -

J431- , -J745-
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code

136 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

55 Dynamic headlight range control (with AFS)

J431
55 Control unit replacement (Repair Group 94)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
Removing
– Remove glove box ⇒ Rep. Gr. 68 .
– Release retaining clip -arrow- and remove control unit -1- from
mounting frame.
– Unplug electrical connector -2-.

– Unplug electrical connector by releasing catch -1- and moving

retaining clip in direction of -arrow-.

cardiagn.com
Installing
• Tightening torque ⇒ page 136
Installation is carried out in the reverse order; note the following:
– Install glove box ⇒ Rep. Gr. 68 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Automatic headlight range control 137

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5 Fog lights

5.1 Exploded view of fog light

1 - Air intake grille

2 - Bolt
❑ 4.5 Nm
3 - Fog light bulb
❑ Left fog light bulb -L22-
❑ Right fog light bulb -L23-
❑ 12 V, 55 W (H11)
❑ Removing and installing
⇒ page 139
4 - Electrical connector
5 - Fog lights

cardiagn.com
❑ Removing and installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
⇒respect
with pageto138the correctness of information in this document. Copyright by AUDI AG.

6 - Bolt
❑ 4.5 Nm

5.2 Removing and installing fog lights

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Use a screwdriver to release fasteners -arrows A-.
– Pull air intake grille -1- off bumper cover -arrow B-.

138 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bolts -1- and -2-.

– Take fog light housing -3- out of bumper cover, at the same
time guide retainer -arrow- out of mounting.
– Unplug electrical connector.
Installing
• Tightening torque ⇒ page 138
Installation is carried out in the reverse order; note the following:
– Adjust fog lights ⇒ page 140 .

5.3 Renewing fog light bulb -L22- / -L23-

Removing
– Loosen front section of front wheel housing liner ⇒ Rep. Gr.
66 .
– Unplug electrical connector -1- at bulb.
– Detach breather hose -3- from fog light (left-side).

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Turn bulb -2-permitted
anti-clockwise -arrow-
unless authorised by AUDIand pull AG
AG. AUDI it out
doesof
not fog lightor accept any liability
guarantee
housing. with respect to the correctness of information in this document. Copyright by AUDI AG.

Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in housing; do not touch glass part of bulb with
bare hands.
– Secure bulb by turning clockwise.
– Attach breather hose to fog light (left-side).
– Install front wheel housing liner ⇒ Rep. Gr. 66 .

5. Fog lights 139

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6 Checking and adjusting headlight

settings
♦ The following checking and adjustment procedures apply to
all countries.
♦ However, national legislation and guidelines for individual
countries must be adhered to.

6.1 Requirements for checking and adjust‐

ing
• Tyre pressure OK.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• Headlight lenses must be clean and dry. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• Headlight lenses must not be damaged.
• Reflectors and bulbs OK.
• Vehicle correctly loaded.
Vehicle loading: driver's seat occupied, otherwise vehicle unloa‐
ded (unladen weight).

cardiagn.com
• One person or 75 kg.
The unladen weight is the weight of the vehicle ready for operation
with full fuel tank including the weight of all equipment normally
carried.
• Fuel tank: at least 90% full.
• Equipment: e.g. spare wheel, tools, jack, fire extinguisher etc.
If the fuel tank is not at least 90 % full, put in additional weight as
follows:
– Read off fuel tank level at fuel gauge in instrument cluster,
compare with the following table and if necessary, place ad‐
ditional weight in luggage compartment.
Fuel gauge Additional weight in kg
1/4 45
1/2 30
3/4 15
Full 0
Example: If fuel tank is half full, place an additional weight of 30
kg into luggage compartment.

Note

Use canisters filled with water as additional weight (a 5 litre can‐

ister filled with water weighs approx. 5 kg).

140 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

• Roll vehicle several metres or depress front and rear springs

fully several times so that springs settle correctly.
• Vehicle and headlight adjustment unit must be on a level sur‐
face.
• Release handbrake to avoid torsion of vehicle.
• Headlight adjustment unit must be aligned to vehicle ⇒authorised
Op‐ by AUDI AG. AUDI AG does not guarantee or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless
erating instructions for headlight adjustment unit .

cardiagn.com
with respect to the correctness of information in this document. Copyright by AUDI AG.

• Position headlight adjustment unit in front of headlight at dis‐

tance -a- 30 ... 70 cm. Dimension -b- = 3 cm must not be
exceeded (measured from headlight centre).
• Adjusting dip setting on headlight adjustment unit ⇒ Operating
instructions for headlight adjustment unit
• Dip setting -arrow- is marked on top edge of headlight -1- in
“%”.

Note

♦ Adjust headlights according to dip setting marked on head‐

light.
♦ The percentage value is for a range of 10 m. Example: Con‐
verting a dip setting of 1.0% = 10 cm.

6.2 Adjusting headlights - rest-of-the-world

vehicles
Procedure
Observe requirements for checking and adjusting ⇒ page 140 .
Vehicles with halogen headlights:
– Set knurled wheel for headlight range control to position “0”.
Vehicles with gas discharge headlights:
– Select function “Basic setting” in operating mode “Guided
Fault Finding” or “Guided Functions” ⇒ Vehicle diagnosis, test‐
ing and information system VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code
55 Dynamic headlight range control (with AFS)
J431

6. Checking and adjusting headlight settings 141

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

55 Basic setting (Repair Group 94)

– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
All vehicles (continued):
– Switch on dipped beam headlights.
• The horizontal light-dark border should coincide with the set‐
ting line -1- of the test surface on the headlight adjustment unit.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• The break-away point -2- between the unless
permitted horizontal section
authorised of the
by AUDI AG. AUDI AG does not guarantee or accept any liability
light-dark border on the left and the risingtosection
with respect on the
the correctness right in this document. Copyright by AUDI AG.
of information
should coincide with the vertical line running through the cen‐
tral point -3-. The bright spot in the centre of the beam should
be to the right of the vertical line.

Note

cardiagn.com
♦ To make it easier to find the break-away point -2-, cover and
uncover the left half of the headlight (as seen in direction of
travel) a few times. Then check the dipped beam again.
♦ If dipped beams have been adjusted correctly the centre point
of the main beam should lie on central point -3-.
♦ If using an old test screen with a 15° setting line, the adjust‐
ment procedure is the same as for the test screen without a
15° setting line. Disregard the 15° setting line -arrow- to avoid
incorrect settings.

– Before adjusting height of headlight, use adjuster screw -1- to

position light-dark border below setting line.
– Then adjust light-dark border to setting line from below.
– Turn adjuster screw -2- for lateral adjustment.

Note

The arrangement on the right headlight is symmetrically opposite.

Vehicles with gas discharge headlights:

– After completing headlight adjustment, end “Basic setting”,
switch off ignition and unplug diagnostic connector.

6.3 Adjusting headlights - USA vehicles

Procedure
Observe requirements for checking and adjusting ⇒ page 140 .
Vehicles with halogen headlights:
– Set knurled wheel for headlight range control to position “0”.

142 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Vehicles with gas discharge headlights:

– Select function “Basic setting” in operating mode “Guided
Fault Finding” or “Guided Functions” ⇒ Vehicle diagnosis, test‐
ing and information system VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code
55 Dynamic headlight range control (with AFS)
J431
55 Basic setting (Repair Group 94)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
All vehicles (continued):
– Switch on dipped beam headlights.
• The horizontal light-dark border should coincide with the set‐
ting line -1- of the test surface on the headlight adjustment unit.

cardiagn.com
• The break-away point -2- between the horizontal section of the
light-dark border on the left and the vertical section on the right
should coincide with the vertical line running through the cen‐
tral point -3-. The bright spot in the centre of the beam should
be to the right of the vertical line.

Note

♦ To make it easier to find the break-away point -2-, cover and

uncover the left half of the headlight (as seen in direction of
travel) a few times. Then check the dipped beam again.
♦ If dipped beams have been adjusted correctly the centre point
of the main beam should lie on central point -3-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Before adjusting height of headlight, use adjuster screw -1- to
with respect to the correctness of information in this document. Copyright by AUDI AG.

position light-dark border below setting line.

– Then adjust light-dark border to setting line from below.
– Turn adjuster screw -2- for lateral adjustment.

Note

The arrangement on the right headlight is symmetrically opposite.

Vehicles with gas discharge headlights:

– After completing headlight adjustment, end “Basic setting”,
switch off ignition and unplug diagnostic connector.

6. Checking and adjusting headlight settings 143

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.4 Adjusting fog lights

Procedure
– Observe requirements for checking and adjusting
⇒ page 140 .
– Turn adjuster screw -arrow- to adjust fog light range.
• Dip setting: 20 cm (corresponds to 2%).

Note

Lateral adjustment is not possible.

6.5 Adjusting additional headlights

Retrofitted additional headlights from other suppliers have to be
checked and adjusted in compliance with the applicable instruc‐
tions.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

144 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7 Turn signal repeaters - vehicles up to

05.2009

7.1 Exploded view of exterior mirror turn signal

1 - Mirror glass
2 - Mounting for mirror adjust‐
ment unit
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
3 - Exterior mirror housing
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
4 - Exterior mirror turn signal
bulb
❑ Driver side exterior mir‐
ror turn signal bulb -
L131-
❑ Front passenger side
exterior mirror turn sig‐
nal bulb -L132-

cardiagn.com
❑ Removing and installing
⇒ page 146
5 - Bolt
❑ 0.9 Nm

7. Turn signal repeaters - vehicles up to 05.2009 145

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7.2 Removing and installing exterior mirror

turn signal bulb -L131- / -L132-
Removing
– Remove mirror glass ⇒ Rep. Gr. 66 .

Note

Mask the area around the mirror housing with a soft cloth to pro‐
tect the paintwork.

– Remove bolts -4- and -5-.

– Release retaining tabs -3- in direction of -arrow A-.
– Release retaining clip -1- and detach exterior mirror housing
-2- from cover -arrows B-.

cardiagn.com
– Press mirror adjustment unit downwards and lift exterior mirror
housing -1- off slightly.
– If fitted, unplug electrical connector -2- for lane change assist
warning lamp at front side of mounting -3- for mirror adjust‐
ment unit.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Lift exterior mirror housing and unplug electrical connector

-3-.
– Remove bolts -1- and -4-.
– Swivel housing -2- for turn signal bulb out of exterior mirror
housing -arrow-.

146 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torques ⇒ page 145
Installation is carried out in the reverse order; note the following:

Note

Entire turn signal in exterior mirror must be renewed as a com‐

plete unit if an LED is defective.

– Insert tip of turn signal repeater in slot in housing -3- for exterior
mirror -arrow A-.
– Swivel housing -4- for turn signal bulb into exterior mirror
housing -arrow B-; locking lug -2- must engage in mounting
-1-.
– Install exterior mirror housing ⇒ Rep. Gr. 66 .

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

7. Turn signal repeaters - vehicles up to 05.2009 147

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

8 Turn signal repeaters - vehicles from

06.2009 onwards

8.1 Exploded view of exterior mirror turn signal

1 - Mirror glass
2 - Mounting for mirror adjust‐
ment unit
3 - Exterior mirror housing
4 - Exterior mirror turn signal
bulb
❑ Driver side exterior mir‐
ror turn signal bulb - Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
L131- permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ Front passenger side
exterior mirror turn sig‐
nal bulb -L132-

cardiagn.com
❑ Removing and installing
⇒ page 149
5 - Bolt
❑ 0.9 Nm

148 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

8.2 Removing and installing exterior mirror

turn signal bulb -L131- / -L132-
Removing
– Remove mirror glass ⇒ Rep. Gr. 66 .

Note

Mask the area around the mirror housing with a soft cloth to pro‐
tect the paintwork.

– Remove bolts -4- and -5-.

– Release retaining clip -2- and detach exterior mirror housing
-3- from cover -1- -arrows-.

cardiagn.com
– On vehicles with lane change assist, only pull out exterior mir‐
ror housing -1- until electrical connector becomes visible.
– Unplug electrical connector -2- for lane change assist warning
lamp at front side of mounting -3- for mirror adjustment unit.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Lift off exterior mirror housing -2- and unplug electrical con‐
nector -3-.
– Remove bolts -1- and -4-.
– Swivel housing -5- for turn signal bulb out of exterior mirror
housing -arrow-.

8. Turn signal repeaters - vehicles from 06.2009 onwards 149

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
• Tightening torques ⇒ page 148
Installation is carried out in the reverse order; note the following:

Note

Entire turn signal in exterior mirror must be renewed as a com‐

plete unit if an LED is defective.

– Insert tip of turn signal repeater -3- in slot in exterior mirror

housing -4- -arrow-.
– Swivel housing -2- for turn signal bulb into exterior mirror
housing and make sure that guide groove engages in guide
-1-.
– Install exterior mirror housing ⇒ Rep. Gr. 66 .

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

150 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9 Tail lights - saloon

Observe notes on contact corrosion ⇒ page 106 .

9.1 Exploded view of outer tail light cluster

1 - Outer tail light cluster

❑ USA vehicles: The rear
side marker light bulb
(LED) is integrated in
the outer tail light clus‐
ter. The LED light can‐
not be renewed sepa‐
rately; the outer tail light
cluster must be re‐
newed as a complete
unit
❑ Removing and installing
⇒ page 152
2 - Turn signal bulb

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted❑ Rear
unless left turn
authorised signal
by AUDI bulb
AG. AUDI AG does not guarantee or accept any liability
with respect-M6-
to the correctness of information in this document. Copyright by AUDI AG.

❑ Rear right turn signal

bulb -M8-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ “9.3 Removing and in‐
stalling bulb holder”,
page 152
3 - Bulb
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ “9.3 Removing and in‐
stalling bulb holder”,
page 152
Rest-of-the-world vehicles
❑ Left brake and tail light
bulb -M21-
❑ Right brake and tail light
bulb -M22-
USA vehicles
❑ Left brake, turn signal and tail light bulb -M69-
❑ Right brake, turn signal and tail light bulb -M70-
4 - Bolt
❑ 1.7 Nm
5 - Bulb holder
❑ Removing and installing ⇒ page 152
6 - Stud
❑ 3.5 Nm

9. Tail lights - saloon 151

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.2 Removing and installing outer tail light

cluster
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Open cover in luggage compartment side trim.
– Remove stud -2-.
– Swivel tail light -1- outwards -arrow-, and at the same time
disengage retaining pin from body.
– Unplug electrical connector.
Installing
• Tightening torque ⇒ page 151
Installation is carried out in the reverse order; note the following:

Note

cardiagn.com
Ensure that self-adhesive seal on tail light housing seals properly.

– Fit tail light in position on body and press retaining pin into hole.
– Tighten stud -2-.

9.3 Removing and installing bulb holder

Removing
– Remove outer tail light cluster ⇒ page 152 .
– Remove bolts -arrows-.
– Take bulb holder -1- out of tail light.
– Screw bulbs out of bulb holder.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in bulb holder, taking care not to touch glass
part of bulb with bare hands.
– Install outer tail light cluster ⇒ page 152 .

9.4 Renewing rear side marker light bulb -

M37- / -M38-
The rear side marker light bulb (LED) is integrated in the outer tail
light cluster. The LED light cannot be renewed separately; the
outer tail light cluster must be renewed as a complete unit.
– Removing and installing outer tail light cluster ⇒ page 152

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

152 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.5 Exploded view of inner tail light cluster

1 - Inner tail light cluster

❑ Removing and installing
⇒ page 153
2 - Reversing light bulb
❑ Left reversing light bulb
-M16-
❑ Right reversing light
bulb -M17-
❑ 12 V, 16 W (W16W)
❑ Renewing bulbs
⇒ page 155
3 - Tail light bulb
❑ Left tail light bulb -M4-
❑ Right tail light bulb -M2-
❑ 12 V, 21 W
❑ Renewing bulbs

cardiagn.com
⇒ page 155
4 - Bulb holder
❑ Removing and installing
⇒ “9.7 Removing and in‐
stalling bulb holder”,
page 155
5 - Seal
❑ Renew if damaged
6 - Tail light and rear fog light
bulb
❑ Left tail light and rear fog
light bulb -M41-
❑ Right tail light and rear
fog light bulb -M42-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ page 155
7 - Nut
❑ 3.5 Nm
8 - Retainer bracket
❑ Secures tail light cluster to rear lid

9.6 Removing and installing inner tail light

cluster
Special tools and workshop equipment required
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

9. Tail lights - saloon 153

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Lever off cover -1- with removal wedge -3409- -arrow-.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -2-.

– Remove nut -3- and remove retainer bracket -4-.
– Swivel inner tail light slightly outwards -arrow A- and detach
from rear lid in direction of -arrow B-.
Installing
Installation is carried out in the reverse order; note the following:
• Tightening torque ⇒ page 153

Note

Ensure that seal between body and tail light housing seals com‐
pletely.

154 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Position inner tail light cluster at outer edge of rear lid.

– Slide retainer bracket -1- onto stud of inner tail light.
– Tighten nut -2-.

Note

As the nut is tightened the retainer bracket becomes wedged in

the rear lid -arrows-.

9.7 Removing and installing bulb holder

cardiagn.com
Special tools and workshop equipment required
♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Lever off cover -1- with removal wedge -3409- -arrow-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

9. Tail lights - saloon 155

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bulb holder -1- from housing (press retainer bracket

-2- in direction of -arrow-).
– Remove tail light and rear fog light bulb from bulb holder.
– Pull reversing light bulb out of bulb holder.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in bulb holder, taking care not to touch glass
part of bulb with bare hands.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com

156 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10 LED tail lights - saloon

Observe notes on contact corrosion ⇒ page 106 .

10.1 Exploded view of outer tail light cluster - rest-of-the-world vehicles

1 - Outer tail light cluster

❑ Removing and installing
⇒ page 158
2 - Rear turn signal bulb
❑ Rear left turn signal bulb
-M6-
❑ Rear right turn signal
bulb -M8-
❑ 12 V, 18 W
❑ W16W
❑ Renewing bulbs
⇒ “10.3 Removing and
installing bulb holder”,

cardiagn.com
page 158
3 - O-ring
4 - Main connector for bulb
holder
❑ Removing and installing
bulb holder
⇒ page 158
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

5 - Stud
with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ 3.5 Nm

10. LED tail lights - saloon 157

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10.2 Removing and installing outer tail light

cluster
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Open cover in luggage compartment side trim.
– Remove stud -2-.
– Swivel tail light -1- outwards -arrow-, and at the same time
disengage retaining pins from body.
– Unplug electrical connector.
Installing
• Tightening torque ⇒ page 157
Installation is carried out in the reverse order; note the following:

Note

cardiagn.com
Ensure that self-adhesive seal on tail light housing seals properly.

– Fit tail light cluster in position on body and press retaining pins
into holes.
– Tighten stud.

10.3 Removing and installing bulb holder

Removing
– Remove outer tail light cluster ⇒ page 158 .
– Turn bulb holder -1- anti-clockwise -arrow- and pull it out of tail
light housing.
– Take bulb out of bulb holder.

Note

Disregard -item 2-.

Installing
Installation is carried out in the reverse order; note the following:
– Insert newProtected
bulb inbybulb holder,
copyright. Copyingtaking care
for private not to purposes,
or commercial touch glass
in part or in whole, is not
part of bulbpermitted
with bare hands.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Secure bulb holder by turning in clockwise direction.
– Install outer tail light cluster ⇒ page 158 .

158 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10.4 Exploded view of inner tail light cluster

1 - Inner tail light cluster

❑ Removing and installing
⇒ page 159
2 - Seal
❑ Renew if damaged
3 - Rear fog light bulb
❑ Rear left fog light bulb -
L46-
❑ Rear right fog light bulb
-L47-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ page 161
4 - O-ring
5 - Retainer bracket (large)

cardiagn.com
❑ Secures tail light cluster
to rear lid
6 - Nut
❑ 3.5 Nm
7 - Main connector
❑ For bulb holders Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
8 - Nut with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ 3.5 Nm
9 - Retainer bracket (small)
❑ Secures tail light cluster
to rear lid
10 - O-ring
11 - Reversing light bulb
❑ Left reversing light bulb
-M16-
❑ Right reversing light bulb -M17-
❑ 12 V, 18 W
❑ W16W
❑ Renewing bulbs ⇒ page 161

10.5 Removing and installing inner tail light

cluster
Special tools and workshop equipment required

10. LED tail lights - saloon 159

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal wedge -3409-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Lever off cover -1- with removal wedge -3409- -arrow-.

cardiagn.com
– Unplug electrical connector -5-.
– Remove nut -2- and detach retainer bracket (large) -1-.
– Remove nut -4- and detach retainer bracket (small) -3-.
– Detach inner tail light cluster from the outside.
Installing
Installation is carried out in the reverse order; note the following:
• Tightening torque ⇒ page 159

Note

Ensure that seal between body and tail light housing seals com‐
pletely.

– Position inner tail light cluster at outer edge of rear lid.

– Fit retainer bracket (small) -3- onto stud on inner tail light clus‐
ter and loosely fit nut -4-.
– Fit retainer bracket (large) -1- onto stud on inner tail light clus‐
ter and tighten nuts -2- and -4-.

Note

As the nuts are tightened the retainer brackets become wedged

in the rear lid -arrows-.

160 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10.6 Removing and installing rear fog light

bulb -L46- / -L47-
Special tools and workshop equipment required
♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.

cardiagn.com
– Turn light switch to position “0”.
– Lever off cover -1- with removal wedge -3409- -arrow-.

– Turn bulb holder -1- anti-clockwise -arrow- and pull it out of tail
light housing.
– Screw bulb for rear fog light out of bulb holder.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in bulb holder, taking care not to touch glass
part of bulb with bare hands.

10.7 Removing and installing reversing light

bulb -M16- / -M17-
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Specialpermitted
tools unless
and workshop equipment
authorised by AUDI required
AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

10. LED tail lights - saloon 161

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Lever off cover -1- with removal wedgepermitted
-3409- -arrow-.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
– Remove nut -2- and detach retainer bracket (large) -1-.
– Release bulb holder -3-: on left tail light by turning anti-clock‐
wise -arrow-; on right tail light by turning clockwise.
– Pull bulb holder out of tail light housing.
– Pull reversing light bulb out of bulb holder.
Installing
• Tightening torque ⇒ page 159
Installation is carried out in the reverse order; note the following:
– Insert new bulb in bulb holder, taking care not to touch glass
part of bulb with bare hands.
– Fit retainer bracket (large) -1- onto stud on inner tail light clus‐
ter and tighten nut -2-.

Note

As the nut is tightened the retainer bracket becomes wedged in

the rear lid.

162 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11 Tail lights - Avant

Observe notes on contact corrosion ⇒ page 106 .

11.1 Exploded view of outer tail light cluster

1 - Reversing light bulb

❑ Left reversing light bulb
-M16-
❑ Right reversing light
bulb -M17-
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ 12 V,to16
with respect W
the correctness of information in this document. Copyright by AUDI AG.

❑ W16W
❑ Renewing bulbs
⇒ page 166
2 - Bulb
❑ 12 V, 21 W
❑ Renewing bulbs

cardiagn.com
⇒ page 164
Rest-of-the-world vehicles
❑ Left brake and tail light
bulb -M21-
❑ Right brake and tail light
bulb -M22-
USA vehicles
❑ Left brake, turn signal
and tail light bulb -M69-
❑ Right brake, turn signal
and tail light bulb -M70-
3 - Turn signal bulb
❑ Rear left turn signal bulb
-M6-
❑ Rear right turn signal
bulb -M8-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ page 164
4 - Bulb holder
❑ Removing and installing ⇒ page 164
5 - Nut
❑ 3.5 Nm
6 - Stud
❑ 3.5 Nm
7 - Outer tail light cluster
❑ USA vehicles: The rear side marker light bulb (LED) is integrated in the outer tail light cluster. The LED
light cannot be renewed separately; the outer tail light cluster must be renewed as a complete unit
❑ Removing and installing ⇒ page 164

11. Tail lights - Avant 163

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11.2 Removing and installing outer tail light

cluster
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Open cover in luggage compartment side trim.
– Remove stud -2-. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Swivel tail light -1- outwards -arrow-,
with respect to the and at the
correctness same time
of information in this document. Copyright by AUDI AG.
disengage retaining pin from body.
– Unplug electrical connector.
Installing
• Tightening torque ⇒ page 163
Installation is carried out in the reverse order; note the following:

Note

cardiagn.com
Ensure that self-adhesive seal on tail light housing seals properly.

– Fit tail light in position on body and press retaining pin into hole.
– Tighten stud -2-.

11.3 Removing and installing bulb holder

Removing
– Remove outer tail light cluster ⇒ page 164 .
– Remove nuts -arrows-.
– Take bulb holder -2- out of tail light -1-.
– Remove bulbs from bulb holder.
♦ Unscrew turn signal bulb -3-.
♦ Pull out brake and tail light bulb -4- and reversing light bulb
-5-.
Installing
• Tightening torque ⇒ page 151
Installation is carried out in the reverse order; note the following:
– Fit new bulbs in bulb holder; do not touch the glass part of the
bulb with bare hands.
– Install outer tail light cluster ⇒ page 164 .

11.4 Renewing rear side marker light bulb -

M37- / -M38-
The rear side marker light bulb (LED) is integrated in the outer tail
light cluster. The LED light cannot be renewed separately; the
outer tail light cluster must be renewed as a complete unit.
– Removing and installing outer tail light cluster ⇒ page 164

164 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11.5 Exploded view of inner tail light cluster

1 - Inner tail light cluster

❑ Removing and installing
⇒ page 165
2 - Rear fog light bulb
❑ Rear left fog light bulb -
L46-
❑ Rear right fog light bulb
-L47-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ page 166
3 - Tail light bulb
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ Left
permitted tailauthorised
unless light bulb -M4-
by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ Right tail light bulb -M2-
with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ 12 V, 21 W
❑ Renewing bulbs

cardiagn.com
⇒ page 166
4 - Bulb holder
❑ Removing and installing
⇒ page 166
5 - Tail light bulb
❑ Left tail light bulb 2 -
M49-
❑ Right tail light bulb 2 -
M50-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ page 166
6 - Nut
❑ 3.5 Nm
7 - Retainer bracket
❑ Secures tail light cluster to rear lid

11.6 Removing and installing inner tail light

cluster
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Remove cover -1- towards outside of vehicle -arrow-.

11. Tail lights - Avant 165

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -2-.

– Remove nut -3- and remove retainer bracket -4-.
– Swivel inner tail light slightly outwards -arrow A- and detach
from rear lid in direction of -arrow B-.
Installing
Installation is carried out in the reverse order; note the following:
• Tightening torque ⇒ page 165

Note

Ensure that seal between body and tail light housing seals com‐
pletely.

– Position inner tail light cluster at outer edge of rear lid.

cardiagn.com
– Slide retainer bracket -2- onto stud of inner tail light.
• Guide pin -4- on tail light must engage in mounting
Protected -3- onforre‐
by copyright. Copying private or commercial purposes, in part or in whole, is not
tainer bracket. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Tighten nut -1-.

Note

As the nut is tightened the retainer bracket becomes wedged in

the rear lid -arrows-.

11.7 Removing and installing bulb holder

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Remove cover -1- towards outside of vehicle -arrow-.

166 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bulb holder -2- from housing (press retainer bracket

-1- in direction of -arrow-).
– Remove bulbs from bulb holder.
♦ Pull out tail light bulbs -4- and -5-.
♦ Unscrew rear fog light bulb -3-.
Installing
Installation is carried out in the reverse order; note the following:
– Fit new bulbs in bulb holder; do not touch the glass part of the
bulb with bare hands.

cardiagn.com

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

11. Tail lights - Avant 167

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

12 LED tail lights - Avant

Observe notes on contact corrosion ⇒ page 106 .

12.1 Exploded view of outer tail light cluster

1 - Reversing light bulb

❑ Left reversing light bulb
-M16-
❑ Right reversing light
bulb -M17-
❑ 12 V, 16 W
❑ W16W
❑ Renewing bulbs
⇒ “12.3 Removing and
installing bulb holder”,
page 169
2 - Rear turn signal bulb
❑ Rear left turn signal bulb

cardiagn.com
-M6-
❑ Rear right turn signal
bulb -M8-
❑ 12 V, 21 W
❑ Orange
❑ Renewing bulbs
⇒ “12.3 Removing and
installing bulb holder”,
page 169
3 - Bulb holder
❑ Removing and installing
⇒ page 169 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
4 - Nut with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ 3.5 Nm
5 - Stud
❑ 3.5 Nm
6 - Outer tail light cluster
❑ Removing and installing
⇒ page 169

168 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

12.2 Removing and installing outer tail light

cluster
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Open cover in luggage compartment side trim.
– Remove stud -2-.
– Swivel tail light -1- outwards -arrow-, and at the same time
disengage retaining pin from body.
– Unplug electrical connector.
Installing
• Tightening torque ⇒ page 168
Installation is carried out in the reverse order; note the following:

Note

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Ensure that self-adhesive seal on tail light housing seals properly.
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Fit tail light in position on body and press retaining pin into hole.
– Tighten stud.

12.3 Removing and installing bulb holder

Removing
– Remove outer tail light cluster ⇒ page 169 .
– Remove nuts -arrows-.
– Take bulb holder -2- out of tail light -1-.
– Remove bulbs from bulb holder.
♦ Unscrew turn signal bulb -3-.
♦ Pull out reversing light bulb -4-.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in bulb holder, taking care not to touch glass
part of bulb with bare hands.
– Secure bulb holder by turning in clockwise direction.
– Install outer tail light cluster ⇒ page 169 .

12.4 Renewing rear side marker light bulb -

M37- / -M38-
The rear side marker light bulb (LED) is integrated in the outer tail
light cluster. The LED light cannot be renewed separately; the
outer tail light cluster must be renewed as a complete unit.
– Removing and installing outer tail light cluster ⇒ page 169

12. LED tail lights - Avant 169

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

12.5 Exploded view of inner tail light cluster

1 - Inner tail light cluster

❑ Removing and installing
⇒ page 170
2 - Rear fog light bulb
❑ Rear left fog light bulb -
L46-
❑ Rear right fog light bulb
-L47-
❑ 12 V, 21 W
❑ Renewing bulbs
⇒ page 171
3 - Bulb holder
❑ Removing and installing
⇒ page 171
4 - Nut
❑ 3.5 Nm

cardiagn.com
5 - Retainer bracket
❑ Secures tail light cluster
to rear lid

12.6 Removing and installing inner tail light

cluster
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Protected
Remove cover Copying
by copyright. -1- towards
for privateoutside of purposes,
or commercial vehiclein-arrow-.
part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

170 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -2-.

– Remove nut -3- and remove retainer bracket -4-.
– Swivel inner tail light slightly outwards -arrow A- and detach
from rear lid in direction of -arrow B-.
Installing
Installation is carried out in the reverse order; note the following:
• Tightening torque ⇒ page 170

Note

Ensure that seal between body and tail light housing seals com‐
pletely.

– Position inner tail light cluster at outer edge of rear lid.

cardiagn.com
– Slide retainer bracket -2- onto stud of inner tail light.
• Guide pin -4- on tail light must engage in mounting -3- on re‐
tainer bracket.
– Tighten nut -1-.

Note

As the nut is tightened the retainer bracket becomes wedged in

the rear lid -arrows-.

12.7 Removing and installing rear fog light

bulb -L46- / -L47-
Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Remove cover -1- towards outside of vehicle -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

12. LED tail lights - Avant 171

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -1-.

– Remove bulb holder -3- from housing (release retainer bracket
-2-).
– Screw bulb -4- for rear fog light out of bulb holder.
Installing
Installation is carried out in the reverse order; note the following:
– Insert new bulb in bulb holder, taking care not to touch glass
part of bulb with bare hands.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com

172 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

13 Exterior lights (rear) - saloon

13.1 Exploded view of high-level brake light and number plate light

1 - Number plate light

❑ Removing and installing
⇒ page 174
2 - Bulb for number plate light
❑ Left number plate light -
X4-
❑ Right number plate light
-X5-
❑ 12 V, 5 W
❑ Renewing bulbs
⇒ page 174
3 - High-level brake light

cardiagn.com
❑ High-level brake light
bulb -M25-
❑ Removing and installing
⇒ page 174

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

13. Exterior lights (rear) - saloon 173

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

13.2 Removing and installing high-level

brake light bulb -M25-
Removing
– Do not press brake pedal.
– Pull off high-level brake light -2- by moving cover evenly to‐
wards rear of vehicle -arrows-
– Unplug electrical connector -1-.

cardiagn.com
Installing
Installation is carried out in the reverse order; note the following:

Note

Entire high-level brake light must be renewed if LED is defective.

– The mounting -2- of the high-level brake light -3- must engage
evenly in guide rail -1- on both sides.
– Slide high-level brake light evenly to front in direction of travel
until it is heard to engage, taking care to keep it straight
-arrows-.

13.3 Removing and installing number plate

light -X4- / -X5-
Removing
– Turn light switch to position “0”.
– Take number plate light -2- out of rear lid; to do so apply a
screwdriver -1- at slot and push in direction of -arrow-.
– Take bulb -3- out of clamp-type holder.
Installing
Install in reverse order.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

174 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

14 Exterior lights (rear) - Avant

14.1 Exploded view of high-level brake light and number plate light

1 - Left number plate light

❑ Removing and instal‐
ling; renewing bulbs
⇒ page 177
2 - Left number plate light -X4-
❑ 12 V, 5 W
❑ Renewing bulbs
⇒ page 177
3 - Right number plate light -
X5-
❑ 12 V, 5 W
❑ Renewing bulbs
⇒ page 177

cardiagn.com
4 - Right number plate light
❑ Removing and instal‐
ling; renewing bulbs
⇒ page 177
5 - High-level brake light
❑ High-level brake light
bulb -M25-
❑ Removing and installing
⇒ page 175
6 - Spring clips
❑ 5x
7 - Retaining rail

14.2 Removing and installing high-level

brake light bulb -M25-
Removing
– Do not press brake pedal.Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

14. Exterior lights (rear) - Avant 175

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Caution

♦ To facilitate removal of high-level brake light it is sufficient

to unclip and bend back top edge of trim at top of rear lid
only.
♦ To prevent trim at top of rear lid breaking (it must not have
a temperature below 20°C) use hot air blower to slightly
heat up trim at top of rear lid, if necessary. This applies to
older vehicles in particular.

– Unclip trim at top of rear lid from top retaining clips and bend
back ⇒ Rep. Gr. 70 .
– Release retainer -1- towards right -arrow-.

Note

When released, the retainer -1-, springs and spring clips drop into
the rear lid frame and must be removed using a magnet as nec‐
essary.

cardiagn.com
– Press high-level brake light -1- out of rear lid recess starting
at left -arrows-.

Note

If the high-level brake light cannot be removed from the lid recess,
the spring clipsProtected
on thebyhigh-level brake
copyright. Copying for light
privatemust be released
or commercial from
purposes, in part or in whole, is not

outside. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -4-.

Installing
Installation is carried out in the reverse order; note the following:

Note

♦ If the high-level brake light bulb -M25- (LED) is defective, the

complete high-level brake light must be renewed.
♦ New high-level brake lights are supplied ready for fitting and
in their installation position.
♦ If the existing high-level brake light is to be reused, such as
after painting of the rear lid, it must be prepared for installation
⇒ page 177 .

– Plug in electrical connector and insert high-level brake light

into recess in rear lid.
– Press high-level brake light into recess until it engages.
– Install trim at top of rear lid ⇒ Rep. Gr. 70 .

176 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

14.3 Preparing high-level brake light for in‐

stallation

Note

As the high-level brake light falls apart into its individual compo‐
nents when removed, it must be prepared for refitting as follows.

Procedure
– Insert all 5 spring clips -3- into light housing -2-.
• Shorter end of spring clip -arrow A- points to bottom of high-
level brake light.
– Insert retaining rail -1- and slide in as far stop in direction of
-arrow B-.

cardiagn.com
14.4 Removing and installing number plate
light -X4- / -X5-
Removing
– Turn light switch to position “0”.
– Take number plate light -2- out of rear lid; to do so apply a
screwdriver -1- at slot and push in direction of -arrow-.
– Take bulb -3- out of clamp-type holder.
Installing
Install in reverse order.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

14. Exterior lights (rear) - Avant 177

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

15 Steering column switch module and

electronic ignition lock
♦ The steering column switch module consists of the return ring
with slip ring, steering angle sender -G85- , steering column
switches (turn signal switch, wiper switch, cruise control
switch) and the steering column electronics control unit -
J527- .
♦ Fault finding is performed via “Guided Fault Finding” ⇒ Vehicle
diagnosis, testing and information system VAS 5051.

15.1 Exploded view of steering column switch module, electronic ignition lock

1 - Bolt
❑ 0.5 Nm
2 - Transport protection
3 - Steering column electronics
control unit -J527- Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

cardiagn.com
❑ With airbag coil connec‐
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
tor and return ring with
slip ring -F138- , steer‐
ing angle sender -G85-
❑ Removing and installing
⇒ page 179

Caution
Risk of damage to return
ring.
Return
♦ ring with slip ring
must not be turned fol‐
lowing removal.

❑ Pin assignment for

steering column elec‐
tronics control unit -
J527- ⇒ page 181
4 - Mounting
❑ With turn signal switch -
E2- , intermittent wiper
switch -E22-
❑ On vehicles with cruise
control: with cruise con‐
trol system switch -E45-
❑ Removing and installing
⇒ page 183
5 - Clamping ring
6 - Bolt
❑ 4 Nm
7 - Steering column
8 - Entry and start authorisation switch -E415-
❑ Removing and installing ⇒ page 184
9 - Ignition lock

178 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Tightening torque for entry and start authorisation switch -E415-

– Tighten bolt -2- at entry and start authorisation switch -E415-
-item 1- to 3 Nm.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
15.2 Removing and installing steering col‐ with respect to the correctness of information in this document. Copyright by AUDI AG.

umn switch module

Removing
– Move steering wheel down and to rear as far as possible,
making use of full range of steering column adjuster.
– Remove driver's airbag ⇒ Rep. Gr. 69 .

cardiagn.com
– Remove steering wheel ⇒ Rep. Gr. 48 .
– Remove steering column trim ⇒ Rep. Gr. 68 .
– Remove bolt -1-.
– Unplug electrical connector -2-.

WARNING

Before disconnecting the electrical connector -3-, the mechan‐

ic must discharge static by briefly grasping hold of striker plate
for door or similar.

– Unplug electrical connector -3-.

– Press catch -1- in direction of -arrow- until connector -2- dis‐

engages.
– Carefully detach steering column switch module.
Installing
• Tightening torque ⇒ page 178
Installation is carried out in the reverse order; note the following:
– Install steering column trim ⇒ Rep. Gr. 68 .
– Install steering wheel ⇒ Rep. Gr. 48 .
– Install driver's airbag ⇒ Rep. Gr. 69 .

15.3 Removing and installing steering col‐

umn electronics control unit -J527-
Airbag coil connector and return ring with slip ring -F138- and
steering angle sender -G85- are integrated in steering column
electronics control unit -J527- .
Removing
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided

15. Steering column switch module and electronic ignition lock 179
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Functions” ⇒ Vehicle diagnosis, testing and information sys‐

tem VAS 5051.
– Select function or path:
Vehicle brand
Vehicle type
Engine code
16 Steering wheel electronics J527
16 Control unit replacement (Repair Group 94)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.

Note

Return ring with slip ring must be removed/installed in centre po‐

sition (wheels in straight ahead position).

– Move steering wheel down and to rear as far as possible,

making use of full range of steering column adjuster.

cardiagn.com
– Remove driver's airbag ⇒ Rep. Gr. 69 .
– Remove steering wheel ⇒ Rep. Gr. 48 .
– Remove steering column trim ⇒ Rep. Gr. 68 .
– Remove bolt -1-.
– Carefully release retaining hooks -arrows- and pull airbag coil
connector and return ring with slip ring -F138- -item 2- off
steering column switch module -3-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

180 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Release electrical connectors at airbag coil connector and re‐

turn ring with slip ring -F138- -item 3-; to do so, position
screwdriver at retaining hooks -2- and -4-, as shown, and
carefully release connectors -1- and -5- in direction of
-arrows A-.
– Detach airbag coil connector and return ring with slip ring -
F138- at steering column switch module.
Installing
Installation is carried out in the reverse order; note the following:
– Make sure all fasteners and the electrical connectors are prop‐
erly engaged.
– Install steering column trim ⇒ Rep. Gr. 68 .
– Install steering wheel ⇒ Rep. Gr. 48 .
– Install driver's airbag ⇒ Rep. Gr. 69 .
– Perform calibration of steering angle sender in “Guided Fault
Finding” or “Guided Functions” mode after renewing return
ring with slip ring ⇒ Vehicle diagnosis, testing and information
system VAS 5051.

cardiagn.com
– Select function or path:
Vehicle brand
Vehicle type
Engine code
16 Steering wheel electronics J527
16 Calibrate steering angle sender G85 (Repair
Group
Protected by copyright. 94)for private or commercial purposes, in part or in whole, is not
Copying
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

– Continue to follow the instructions on the display of the vehicle

with respect to the correctness of information in this document. Copyright by AUDI AG.

diagnostic tester.

15.4 Pin assignment on steering column

electronics control unit -J527-
♦ The steering column electronics control unit -J527- is part of
the “steering column switch module”. It receives signals e.g.
from the steering column switch.
♦ Checking steering column electronics control unit -J527- in
“Guided Fault Finding” mode ⇒ Vehicle diagnosis, testing and
information system VAS 5051.

15. Steering column switch module and electronic ignition lock 181
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

A - Plug connection: turn signal

switch/cruise control system
(CCS)
1 - Earth, steering column lever
for cruise control

2 - Cruise control, Set

3 - ACC

4 - Cruise control, Res (“+”)/

Set (“–”)

5 - Voltage supply (terminal 15)

6 - Cruise control, earth / turn

signal switch, earth

7 - Cruise control switched Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
“Off” permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
8 - Cruise control Res/Soft

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9 - Radio telephone (AIA)

10 - Headlight flasher

11 - Main beam

12 - Turn signal switch

13 - Turn signal switch, earth

B - Plug connection: coil con‐

nector cassette/airbag/multi-
function steering wheel/horn
1 - Earth

2 - Horn signal

3 - Airbag 1 “+”

4 - Airbag 1 “–”

5 - Airbag 2 “+”

6 - Airbag 2 “–”

7 - tiptronic downshift

8 - Terminal 30

9 - LIN

10 - tiptronic upshift

11 - Dimming (terminal 58s)

12 - tiptronic earth

C - Plug connection: airbag control unit

3 - Airbag 1 “–”

4 - Airbag 1 “+”

5 - Airbag 2 “+”

6 - Airbag 2 “–”

182 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

D - Plug connection: vehicle electrical system

1 - Not used

2 - Not used

3 - Voltage supply (terminal 30)

4 - Drive train CAN bus, screening

5 - Cruise control switched off (click stop engaged)

6 - Not used

7 - Radio telephone/radio telephone button

8 - CAN bus Low (convenience)

9 - CAN bus High (convenience)

10 - Voltage supply (terminal 31)

11 - CAN bus High (drive train)

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12 - CAN bus Low (drive train)

13 - Signal - electronic ignition lock, terminal 15

14 - Not used

15 - Not used

16 - Not used

E - Plug connection: window wiper system/DIS

1 - Earth, wipers

2 - Wiper switch

3 - Wash

4 - DIS signal

5 - Intermittent wipe potentiometer

6 - DIS earth

15.5 Removing and installing turn signal

switch -E2- , cruise control system
switch -E45- , intermittent wiper switch -
E22-
Removing
– Remove steering column switch module ⇒ page 179 .
– Remove steering columnProtected
electronics control unit -J527-
by copyright. Copying for private or commercial purposes, in part or in whole, is not
⇒ page 179 . permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Detach turn signal switch -E2- , cruise control system switch -
E45- , intermittent wiper switch -E22-
Installing
Installation is carried out in the reverse order; note the following:
– Install steering column electronics control unit -J527-
⇒ page 179 .

15. Steering column switch module and electronic ignition lock 183
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Install steering column switch module ⇒ page 179 .

15.6 Removing and installing entry and start

authorisation switch -E415-

Note

♦ Reader coil for immobilizer is attached to entry and start au‐

thorisation switch -E415- and cannot be renewed separately.
♦ The entry and start authorisation switch -E415- must be re‐
newed if reading coil is defective.
♦ Adaption to immobilizer is not necessary if the entry and start
authorisation switch is renewed.
♦ The lock in the entry and start authorisation switch is not me‐
chanically coded.
♦ Therefore the keys must not be renewed after renewing entry
and start authorisation switch (continue to use old keys).

Special tools and workshop equipment required

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♦ Ignition lock removal pliers -VAS 6339-

Removing
– Remove dash panel trim (driver's side) ⇒ Rep. Gr. 68 .
– On USA vehicles, remove impact damper (right-side) ⇒ Rep.
Gr. 70 .
– Remove cover for MMI screen ⇒ Rep. Gr. 70 .
– Remove trim cover for instrument cluster ⇒ Rep. Gr. 68 .
– Remove bolt -2- for trim panel -1-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

184 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Insert ignition lock removal pliers -VAS 6339- through flaps of

trim panel.
– Position pointed ends of ignition lock removal pliers -VAS
6339- at the two holes -arrows A- on entry and start authori‐
sation switch -E415- -2-.
– Press -VAS 6339- together -arrows B-; this will pry apart poin‐
ted ends of pliers and release retaining tabs on trim panel.
– Keep -VAS 6339- pressed with one hand and pull off trim panel
-1- -arrow C- with the other hand.

Note

Detach trim panel by hand and use ignition lock removal pliers -
VAS 6339- for releasing only.

– Remove bolt -2-.

– Take entry and start authorisation switch -E415- -item 1- out
of dash panel towards front in direction of driver's footwell.

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– Unplug connector -3- by sliding locking element -4- upwards
-arrow- and pressing release catch inwards.
Installing
• Tightening torque ⇒ page 179
Installation is carried out in the reverse order; note the following:
– Install trim cover for instrument cluster ⇒ Rep. Gr. 68 .
– Install cover for MMI screen ⇒ Rep. Gr. 70 .
– On USA vehicles, install impact damper (right-side) ⇒ Rep.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Gr. 70 . permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install dash panel trim (driver's side) ⇒ Rep. Gr. 68 .

15. Steering column switch module and electronic ignition lock 185
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

15.7 Pin assignment at entry and start au‐

thorisation switch -E415-
Plug connection
3 - Not used
4 - Not used
5 - S contact
6 - Terminal 15
7 - LIN
8 - Terminal 30
9 - Not used
10 - Not used
11 - Not used
12 - Not used
13 - RED2, terminal 15

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14 - RED, terminal 15
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
15 - Ignition/starter switch
permitted unless authorised + AG. AUDI AG does not guarantee or accept any liability
by AUDI
with respect to the correctness of information in this document. Copyright by AUDI AG.
16 - Terminal 31

186 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

16 Parking aid

16.1 Overview of parking aid

1 - Front centre right parking

aid sender -G253-
❑ In radiator grille
❑ Removing and installing
(saloon and Avant)
⇒ page 191
❑ Removing and installing
(allroad) ⇒ page 191
2 - Front right parking aid send‐
er -G252-
❑ In front bumper
❑ Removing and installing
(saloon and Avant)

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⇒ page 191
❑ Removing and installing
(allroad) ⇒ page 191
3 - Parking aid button -E266-
❑ Only for 8-channel park‐
ing aid
❑ Fitting location
⇒ page 188 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
4 - Rear parking aid warning permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

buzzer -H15-
with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ At belt guide (rear right)

❑ Removing and installing
⇒ page 190
5 - Parking aid control unit -
J446-
Vehicles without towing brack‐
et
❑ Removing and installing
⇒ page 188
Vehicles with towing bracket
❑ Removing and installing ⇒ page 189
6 - Rear right parking aid sender -G206-
❑ In rear bumper
❑ Removing and installing ⇒ page 192
7 - Rear centre right parking aid sender -G205-
❑ In rear bumper
❑ Removing and installing ⇒ page 192
8 - Rear centre left parking aid sender -G204-
❑ In rear bumper
❑ Removing and installing ⇒ page 192
9 - Rear left parking aid sender -G203-
❑ In rear bumper
❑ Removing and installing ⇒ page 192

16. Parking aid 187

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10 - Front parking aid warning buzzer -H22-

❑ Only for 8-channel parking aid
❑ At central tube for dash panel behind driver's side storage compartment
❑ Removing and installing ⇒ page 190
11 - Front left parking aid sender -G255-
❑ In front bumper
❑ Removing and installing (saloon and Avant) ⇒ page 191
❑ Removing and installing (allroad) ⇒ page 191
12 - Front centre left parking aid sender -G254-
❑ In radiator grille
❑ Removing and installing (saloon and Avant) ⇒ page 191
❑ Removing and installing (allroad) ⇒ page 191

Fitting location for parking aid button -E266-

♦ In centre console switch unit -arrow-.
♦ Removing and installing: vehicles equipped with MMI basic

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⇒ page 217 ; vehicles equipped with MMI convenience
⇒ page 200 .

Note

The illustration shows the MMI convenience equipment.

Tightening torque for mounting frame for parking aid control unit
-J446-
1- Nut, 3 Nm
2- Mounting frame for parking aid control unit -J446-
3- Nut, 3 Nm
4- Cable tie
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

16.2 Removing and installing parking aid

control unit -J446- - vehicles without
towing bracket
Removing
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:
Vehicle brand
Engine code
10 Parking aid J446
J446 Replace parking aid control unit

188 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Continue to follow the instructions on the display of the vehicle

diagnostic tester.
– Open cover in luggage compartment side trim (right-side).
– Release retaining clip -2- and remove parking aid control unit
-J446- -item 1- from mounting frame.
– Unplug electrical connectors -3 … 5-.
Installing
Install in reverse order.

16.3 Removing and installing parking aid

control unit -J446- - vehicles with towing
bracket
Removing

cardiagn.com
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:
Vehicle brand
Engine code
10 Parking aid J446
J446 Replace parking aid control unit
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
– Open cover in luggage compartment side trim (right-side).
– Remove nuts -1- and -3-.
– Detach electrical wiring from guides -arrows- on mounting
frame -2- and cut open cable tie -4-.
– Remove mounting frame upwards.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

16. Parking aid 189

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connectors -2 … 4-.

– Release clip -arrow- and remove parking aid control unit -
J446- -item 5- from mounting frame -1-.
Installing
• Tightening torque ⇒ page 188
Installation is carried out in the reverse order; note the following:

Note Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Refit all cable ties at the same locations when reinstalling. with respect to the correctness of information in this document. Copyright by AUDI AG.

16.4 Removing and installing front parking

aid warning buzzer -H22- - 8-channel
parking aid
Removing
– Switch off ignition and take out ignition key.

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– Remove dash panel trim (driver's side) ⇒ Rep. Gr. 68 .
– Remove bolts -1- and -3- and detach front parking aid warning
buzzer -H22- -item 2-.
– Unplug electrical connector -4-.
Installing
Installation is carried out in the reverse order; note the following:
– Install dash panel trim (driver's side) ⇒ Rep. Gr. 68 .

16.5 Removing and installing rear parking aid

warning buzzer -H15-
Removing
– Switch off ignition and take out ignition key.
– Remove belt guide (right-side) ⇒ Rep. Gr. 69 .
– Pull out rear parking aid warning buzzer -H15- -item 1- at belt
guide (right-side) -2- in direction of -arrow-.
Installing
Installation is carried out in the reverse order; note the following:
– Install belt guide (right-side) ⇒ Rep. Gr. 69 .

190 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

16.6 Removing and installing front parking

aid senders -G252- / -G253- / -G254- / -
G255- - saloon and Avant
Removing
Outer senders:
– Remove front wheel housing liner ⇒ Rep. Gr. 66 .
– Press the two retaining tabs apart -arrows- and at the same
time press out sender -2- from outside to inside.
– Unplug electrical connector -1- on sender.

Inner senders:
– Reach through openings in radiator grille behind mountings
and press the two retaining tabs apart -arrows-, at the same

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time press out sender -2- from outside to inside.
– Unplug electrical connector -1- on sender.
Installing
Installation is carried out in the reverse order; note the following:
Outer senders:
– Install front wheel housing liner ⇒ Rep. Gr. 66 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

16.7 Removing and installing front parking

with respect to the correctness of information in this document. Copyright by AUDI AG.

aid senders -G252- / -G253- / -G254- / -

G255- - allroad
Removing
Outer senders:
– Remove front wheel housing liner ⇒ Rep. Gr. 66 .
– Press the two retaining tabs apart -arrows- and at the same
time press out sender -2- from outside to inside.
– Unplug electrical connector -1- on sender.

Inner senders:
– Use a screwdriver to release fasteners -arrows A-.
– Pull air intake grille -1- off bumper cover -arrow B-.

16. Parking aid 191

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Reach through opening for air intake grille and press the two
retaining tabs apart -arrows-, at the same time press out send‐
er -2- from outside to inside.
– Unplug electrical connector -1- on sender.
Installing
Installation is carried out in the reverse order; note the following:
Outer senders:
– Install front wheel housing liner ⇒ Rep. Gr. 66 .

16.8 Removing and installing rear parking aid

senders -G203- / -G204- / -G205- / -
G206-
Removing
Outer senders:

cardiagn.com
– Remove bolts -arrows- on bottom section of bumper cover.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Vehicles with rear silencer:

– Remove nuts -5- and -7- and detach retainer -6-.
– Pull out clamping pin -arrow- and detach fastener -1-.
– Remove nuts -2- and -3- and detach rear bottom aerodynamic
fairing -4-.
All senders (continued):
– Reach behind the bumper cover from underneath.
Inner senders (saloon):
– Remove rear bumper cover ⇒ Rep. Gr. 63 .

192 Rep. Gr.94 - Lights, bulbs, switches - exterior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All senders (continued):

– Press both retaining tabs apart -arrows- and press out sender
-2- from outside to inside.
– Unplug electrical connector -1- on sender.
Installing
Installation is carried out in the reverse order; note the following:
Inner senders (saloon):
– Install rear bumper cover ⇒ Rep. Gr. 63 .
Vehicles with lane change assist:
Lane change assist control unit -J769- / -J770- must be recali‐
brated whenever bumper cover has been removed
⇒ “11.6 Calibrating lane change assist - test equipment layout”,
page 251 .
Outer senders:
– Install bottom section of bumper cover ⇒ Rep. Gr. 63 .

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

16. Parking aid 193

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

96 – Lights, bulbs, switches - interior

1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers, etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
Furthermore, rubber components or plastic components and ad‐
hesives are
Protected by made
copyright. of non-conductive
Copying material.
for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Always fit new
with respect to thecomponents if youinare
correctness of information not sure
this document. that the
Copyright oldAG.
by AUDI com‐
ponents are suitable ⇒ Electronic parts catalogue .
Note:
♦ We recommend the use of genuine replacement parts only;
they have been tested and are compatible with aluminium.
♦ We recommend using Audi Genuine Accessories.
♦ Damage resulting from contact corrosion is not covered by

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warranty.

194 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2 Lights and switches in dash panel

Observe notes on contact corrosion ⇒ page 194 .

2.1 Overview of lights and switches in dash panel

1 - Valet parking button -E536-

❑ Removing and installing
⇒ page 200
2 - Glove compartment light -
W6-
❑ 12 V, 5 W
❑ Removing and installing
⇒ page 201
3 - Dash panel right vent illu‐
mination bulb -L69-
❑ Removing and installing
⇒ page 196

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4 - Glove compartment light
switch -E26-
❑ Removing and installing
⇒ page 202
5 - Front right footwell illumina‐
tion bulb -L152-
❑ Removing and installing
⇒ page 202
6 - Hazard warning lights but‐
ton -E229-
❑ Removing and installing
⇒ page 198
7 - Warning lamp for airbag de‐
activated on front passenger
side -K145-
❑ Removing and installing
⇒ page 199
8 - Dash panel central vent il‐
lumination bulb -L68-
❑ In dash panel vent (cen‐
tre). Cannot be renewed
separately if defective
❑ Removing and installing dash panel vents (centre) ⇒ Rep. Gr. 70
9 - Heated front passenger seat regulator -E95-
❑ Integrated in Climatronic control unit -J255- (may also be referred to as “front operating and display unit”).
Cannot be renewed separately if defective
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ Removing and installing unless
permitted Climatronic control
authorised by AUDI AG.unitAUDI-J255- ⇒ guarantee
AG does not Rep. Gr. 87 any liability
or accept
with respect to the correctness of information in this document. Copyright by AUDI AG.
10 - Switch panel
❑ Only on vehicles equipped with MMI convenience
❑ Depending on version: with switch module for Charisma -E592- , rear roller blind switch -E149- , TCS
and ESP button -E256- , parking aid button -E266-
❑ Removing and installing ⇒ page 200
11 - Heated driver seat regulator -E94-
❑ Integrated in Climatronic control unit -J255- (may also be referred to as “front operating and display unit”).
Cannot be renewed separately if defective

2. Lights and switches in dash panel 195

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

❑ Removing and installing Climatronic control unit -J255- ⇒ Rep. Gr. 87

12 - Light switch -E1-
❑ Removing and installing ⇒ page 196
❑ With switch and instrument illumination regulator -E20- . Removing and installing ⇒ page 196
❑ With rear fog light button -E314- , fog light button -E315- . Removing and installing ⇒ page 196
13 - Dash panel left vent illumination bulb -L67-
❑ Removing and installing ⇒ page 196
14 - Headlight range control regulator -E102-
❑ Removing and installing ⇒ page 198
15 - Front left footwell illumination bulb -L151-
❑ Removing and installing ⇒ page 202

2.2 Removing and installing dash panel

vent illumination bulb (left and right) -
L67- / -L69-

cardiagn.com
Removing
– Remove appropriate dash panel vent ⇒ Rep. Gr. 70 .
– Release retaining clips and detach electrical connector -1- on
dash panel vent.
– Using a small screwdriver, carefully lever housing -2- for LED
off upwards -arrow-.
– Detach LED for dash panel vent.
Installing
Installation is carried out in the reverse order; note the following:
– Install dash panel vents ⇒ Rep. Gr. 70 .

2.3 Removing and installing switch and in‐

strument illumination regulator -E20-
The switch and instrument illumination regulator -E20- is integra‐
ted in the housing of the light switch -E1- and cannot be renewed
separately if defective.
– Removing and installing light switch -E1- ⇒ page 196 .

2.4 Removing and installing rear fog light

button -E314- , fog light button -E315-
The rear fog light button -E314- and the fog light button -E315-
are integrated in the housing of the light switch
Protected-E1- and cannot
by copyright. Copying for private or commercial purposes, in part or in whole, is not
be renewed separately if defective. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Removing and installing light switch -E1- ⇒ page 196 .

2.5 Removing and installing light switch -

E1-
Special tools and workshop equipment required

196 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.
– Turn light switch to position “0”.
– Lever side cover -1- off dash panel with removal wedge -3409-
-arrow- and detach.

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– Release retaining clip -arrow A- and swivel out fuse holder C
-2- in direction of -arrow B- on central tube -1- for dash panel
and place down facing inside.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Lights and switches in dash panel 197

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Reach through opening on dash panel side and press light

switch -E1- -item 1- out of dash panel trim (driver's side) to‐
wards rear -arrow-.
– Unplug electrical connector.
Installing
Installation is carried out in the reverse order; note the following:
– Press switch into switch housing until catch engages.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2.6 Removing and installing headlight range

cardiagn.com
control regulator -E102-
Removing
– Remove dash panel trim (driver's side) ⇒ Rep. Gr. 68 .
– Remove trim cover for instrument cluster ⇒ Rep. Gr. 68 .
– Remove bolts -arrows- and detach light switch panel -1-.
– Unplug electrical connector for light switch -E1- .

Note

Illustration shows light switch -E1- removed.

– Unplug electrical connector -1- on headlight range control reg‐

ulator -E102- (press release tab).
– Carefully release retaining hooks -arrows- using a small
screwdriver.
– Press headlight range control regulator -E102- -item 2- out of
light switch panel.
Installing
Installation is carried out in the reverse order; note the following:
– Install light switch panel ⇒ Rep. Gr. 70 .
– Install trim cover for instrument cluster ⇒ Rep. Gr. 68 .
– Install dash panel trim (driver's side) ⇒ Rep. Gr. 68 .

2.7 Removing and installing hazard warning

lights button -E229-
Special tools and workshop equipment required

198 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.
– Use removal wedge -3409- to lever off cover for MMI screen
at corners -arrow- and detach.
– Unplug electrical connector and detach mounting frame.

cardiagn.com
– Press hazard warning lights button -E229- -item 1- out of
mounting frame -2- -arrow-.
Installing
Installation is carried out in the reverse order; note the following:
– Press cover for MMI screen
Protected onto mounting
by copyright. Copying points
for privateuntil fasten‐
or commercial purposes, in part or in whole, is not
ers engage fully. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2.8 Removing and installing warning lamp

for airbag deactivated on front passen‐
ger side -K145-
The warning lamp for airbag deactivated on front passenger side
-K145- is integrated in the housing for the hazard warning lights
button -E229- and cannot be renewed separately if defective.
– Removing and installing hazard warning lights button -E229-
⇒ page 198 .

2. Lights and switches in dash panel 199

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.9 Removing and installing switch panel in

dash panel - vehicles equipped with
MMI convenience
Removing
– Remove CD changer ⇒ Rep. Gr. 91 .
– Carefully release retaining hooks -arrows- using a small
screwdriver.
– Press switch panel -1- out of switch mounting -2-.
Installing
Installation is carried out in the reverse order; note the following:
– Press switch panel into switch housing until catch engages
with a click.
– Install CD changer ⇒ Rep. Gr. 91 .

2.10 Removing and installing heated driver

seat regulator -E94- / heated front pas‐

cardiagn.com
senger seat regulator -E95-
The front heated seat regulators are integrated in the Climatronic
control unit -J255- (may also be referred to as “front operating and
display unit”). They cannot be renewed separately.
– Removing and installing Climatronic control unit -J255- ⇒
Rep. Gr. 87 .

2.11 Removing and installing Valet parking

button -E536-
Removing
– Remove glove box ⇒ Rep. Gr. 68 .
– Unplug electrical connector -2-.
– Release retaining clips -arrow A- and press out trim -3- for
Valet parking button -E536- -item 1- towards front -arrow B-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

200 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Carefully release retaining clips -arrows- using a small screw‐

driver.
– Remove Valet parking button -E536- -item 1- from trim panel
-2- towards front.
Installing
Installation is carried out in the reverse order; note the following:
– Install glove box ⇒ Rep. Gr. 68 .

2.12 Removing and installing glove compart‐

cardiagn.com
ment light -W6-
Removing
– Turn light switch to position “0”.
– Use flat screwdriver to press in retaining tab -1- and pry out
glove compartment light -2-.
– Unplug electrical connector -3-.

– To renew bulb, release clips -arrows- and detach cover -1-

over bulb.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Lights and switches in dash panel 201

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Remove bulb -1- from bulb holder -2- on reverse side of glove
compartment light.
Installing
Installation is carried out in the reverse order; note the following:
– Plug in electrical connector.
– Insert glove compartment light in opening and engage on op‐
posite side.

2.13 Removing and installing glove compart‐

ment light switch -E26-
Removing
– Switch off ignition and take out ignition key.
– Detach fuse holder D -SD- at dash panel (right-side) and move
to side ⇒ page 280 .

cardiagn.com
– Unplug electrical connector -3-.
– Pull out hinge pin -1-.
– Release switch -2- in anti-clockwise direction -arrow- and de‐
tach.
Installing
Installation is carried out in the reverse order; note the following:
– Engage fuse holder D -SD- at dash panel on right
⇒ page 280 .

2.14 Removing and installing front left foot‐

well illumination bulb -L151- / front right
footwell illumination bulb -L152-
Removing
– Use flat-bladed screwdriver to press in retaining tab -1- and
pry out footwell light -2-.
– Unplug electrical connector -3-.
Installing
Installation is carried out in the reverse order; note the following:
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

If the LED is defective, the complete footwell light must be re‐

newed.

– Insert footwell light in opening and engage on opposite side.

202 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3 Lights and switches in front doors

3.1 Overview of lights and switches in front doors

1 - Driver seat memory operat‐

ing unit -E97-
❑ Removing and installing
⇒ page 206
2 - Driver door opener illumi‐
nation bulb -L108-
❑ Removing and installing
⇒ page 207
3 - Driver side interior locking
switch -E150-
❑ Removing and installing
⇒ page 205
4 - Mirror adjustment switch -

cardiagn.com
E43- or adjustment switch for
mirror with fold-in feature -
E168-
❑ Removing and installing
⇒ page 204
5 - Rear lid remote release
switch -E188-
❑ Removing and installing
⇒ page 206
6 - Operating unit for window
regulator in driver door -E512-
❑ With front left window
regulator switch -E40-
and front right window
regulator switch in driver
door -E81-
❑ With rear left window
regulator switch, in driv‐
er door -E53- , rear right
window regulator
switch, in driver door -
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
E55- and rear window permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
regulator isolation switch -E39-to the correctness of information in this document. Copyright by AUDI AG.
with respect

❑ Removing and installing window regulator switches ⇒ page 205

7 - Window regulator switch in front passenger door -E107-
❑ Removing and installing ⇒ page 205
8 - Front passenger side interior locking switch -E198-
❑ Removing and installing ⇒ page 205
9 - Front passenger door opener illumination bulb -L109-
❑ Removing and installing ⇒ page 207
10 - Front right entry light -W32-
❑ 12 V, 3 W
❑ Removing and installing ⇒ page 208
11 - Front passenger door contact switch -F3-
❑ Integrated in door lock. Cannot be renewed separately if defective

3. Lights and switches in front doors 203

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

❑ Removing and installing door lock ⇒ Rep. Gr. 57

12 - Front passenger side door warning lamp -W36-
❑ 12 V, 3 W
❑ Removing and installing ⇒ page 208
13 - Driver side door warning lamp -W30-
❑ 12 V, 3 W
❑ Removing and installing ⇒ page 208
14 - Interior monitoring switch -E183- / alarm system off switch -E217-
❑ Removing and installing ⇒ page 244
15 - Central locking deadlock function warning lamp -SAFE- -K133-
❑ Removing and installing ⇒ page 207
16 - Driver door contact switch -F2-
❑ Integrated in door lock. Cannot be renewed separately if defective
❑ Removing and installing door lock ⇒ Rep. Gr. 57
17 - Front left entry light -W31-
❑ 12 V, 3 W

cardiagn.com
❑ Removing and installing ⇒ page 208

3.2 Removing and installing mirror adjust‐

ment switch -E43- / -E168-
Removing
– Switch off ignition and take out ignition key.
– Insert screwdriver in hole at bottom of trim -1-.
– Starting at rear, carefully prise trim off door trim -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -3-.

– Carefully release retaining hooks -arrows- using a small
screwdriver.
– Press mirror adjustment switch -2- out of switch mounting
-1-.
Installing
Installation is carried out in the reverse order; note the following:

Note

When installing, make sure symbol panel is inserted before mirror

adjustment switch.

– Press mirror adjustment switch into switch mounting until re‐

taining hooks engage.
– Fit trim for armrest ⇒ Rep. Gr. 70 .

204 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.3 Removing and installing window regula‐

tor switches -E512- / -E107-
Removing
– Switch off ignition and take out ignition key.
– Insert screwdriver in hole at bottom of trim -1-.
– Starting at rear, carefully prise trim off door trim -arrow-.

– Unplug electrical connector -3-.

– Carefully pull retaining tabs to one side -arrow A-.
– Press window regulator switch -2- out of switch mounting -1-
-arrows B-.

cardiagn.com
Installing
Installation is carried out in the reverse order; note the following:
– Press window regulator switch into switch mounting until re‐
taining hooks engage.
– Fit trim for armrest ⇒ Rep. Gr. 70 .

3.4 Removing and installing driver side in‐

terior locking switch -E150- / front pas‐
senger side interior locking switch -
E198-
Removing
– Switch off ignition and take out ignition key.
– Remove door trim (front) ⇒ Rep. Gr. 70 .
– Unplug electrical connector -1-.
– Release retainers -arrows- and press interior locking switch
-2- out of door trim.
Installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Installation is carried out in the reversepermitted
order;unless
noteauthorised
the following:
by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Press interior locking switch into switch mounting until retain‐
ers engage.
– Install door trim (front) ⇒ Rep. Gr. 70 .

3. Lights and switches in front doors 205

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.5 Removing and installing driver seat

memory operating unit -E97-
Removing
– Switch off ignition and take out ignition key.
– Remove door trim (front) ⇒ Rep. Gr. 70 .
– Unplug electrical connector -2-.
– Carefully release retaining hooks -arrows A- using a small
screwdriver.
– Press driver seat memory operating unit -E97- -item 1- out of
switch mounting -3-.
Installing
Installation is carried out in the reverse order; note the following:
– Press driver sear memory operating unit -E97- into switch
mounting until retaining hooks engage.
– Install door trim (front) ⇒ Rep. Gr. 70 .

cardiagn.com
3.6 Removing and installing rear lid remote
release switch -E188-
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Removing with respect to the correctness of information in this document. Copyright by AUDI AG.

– Switch off ignition and take out ignition key.

– Remove door trim (front) ⇒ Rep. Gr. 70 .
– Unplug electrical connector -3- at rear lid remote release
switch.
– Release retaining clip -1- and press trim panel -2- with rear lid
remote release switch out of door trim -arrow-.

– Carefully release retaining hooks -arrows- using a small

screwdriver.
– Take rear lid remote release switch -1- towards rear out of trim
panel -2-.
Installing
Installation is carried out in the reverse order; note the following:
– Press trim panel -2- with rear lid remote release switch into
mounting until retaining hooks engage.
– Install door trim (front) ⇒ Rep. Gr. 70 .

206 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.7 Removing and installing door opener il‐

lumination bulb -L108- / -L109-
Removing
– Remove door trim (front) ⇒ Rep. Gr. 70 .
– Unplug electrical connector -1-.
– Turn bulb holder -2- anti-clockwise and pull out at door opener.
Installing
Installation is carried out in the reverse order; note the following:
– Insert door opener illumination bulb in opening and engage.
– Install door trim (front) ⇒ Rep. Gr. 70 .

3.8 Removing and installing central locking

deadlock function warning lamp -SAFE-
-K133-

cardiagn.com
Removing
– Switch off ignition and take out ignition key.
– Remove door trim (front)Protected
⇒ Rep. Gr. 70
by copyright. . for private or commercial purposes, in part or in whole, is not
Copying
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Release retaining clips -arrows-.
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove LED -1- for central locking downwards out of door trim
-2-.
Installing
Installation is carried out in the reverse order; note the following:

Note

The new central locking deadlock function warning lamp -SAFE-

-K133- must be connected with the door trim wiring harness.

– Cut electrical wiring and re-connect with new wiring for central
locking deadlock function warning lamp -SAFE- -K133- ⇒
Electrical system general information; Rep. Gr. 97 ; repairing
an 0.25 mm2 wire .
– Press LED for central locking in so that it engages audibly.
– Install door trim (front) ⇒ Rep. Gr. 70 .

3.9 Removing and installing door contact

switch -F2- / -F3-
The door contact switch is located in the door lock and cannot be
renewed separately if defective.
– Removing and installing front door lock ⇒ Rep. Gr. 57 .
– Removing and installing rear door lock ⇒ Rep. Gr. 58 .

3. Lights and switches in front doors 207

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.10 Removing and installing front entry light

-W31- / -W32- and door warning lamp -
W30- / -W36-
Removing
– Use flat screwdriver to press in retainer tab -1- and pry out door
warning lamp/entry light (front) -2-.
– Unplug electrical connector -3-.

cardiagn.com
Door warning lamp:
– Carefully prise off cover over bulb -arrow-.

Entry light:
– Release retaining clips -arrows- and detach cover -1- over
bulb.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

208 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All vehicles (continued):

– Take bulb -1- on back of door warning lamp/entry light out of
bulb holder -2-.
Installing
Installation is carried out in the reverse order; note the following:
– Attach cover at door warning light/entry light.
– Insert door warning light/entry light in opening and engage on
opposite side.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com

3. Lights and switches in front doors 209

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4 Lights and switches in rear doors

4.1 Overview of lights and switches in rear doors

1 - Rear left door opener illu‐

mination bulb -L110-
❑ Removing and installing
⇒ page 212
2 - Rear left interior locking
switch -E273-
❑ Removing and installing
⇒ page 211
3 - Rear left window regulator
switch, in door -E52-
❑ Removing and installing
⇒ page 211
4 - Rear right window regulator

cardiagn.com
switch, in door -E54-
❑ Removing and installing
⇒ page 211
5 - Rear right interior locking
switch -E274-
❑ Removing and installing
⇒ page 211
6 - Rear right door opener illu‐
mination bulb -L111-
❑ Removing and installing
⇒ page 212
7 - Rear right door contact
switch -F11-
❑ Integrated in door lock.
Cannot be renewed
separately if defective
❑ Removing and installing
door lock ⇒ Rep. Gr. 58
8 - Rear right door warning
lamp -W38-
❑ 12 V, 3 W
❑ Removing and installing ⇒ page 212
9 - Rear right entry light -W34-
❑ 12 V, 3 W Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ Removing and installingpermitted⇒ page
unless 212 by AUDI AG. AUDI AG does not guarantee or accept any liability
authorised
with respect to the correctness of information in this document. Copyright by AUDI AG.
10 - Rear left door contact switch -F10-
❑ Integrated in door lock. Cannot be renewed separately if defective
❑ Removing and installing door lock ⇒ Rep. Gr. 58
11 - Rear left door warning lamp -W37-
❑ 12 V, 3 W
❑ Removing and installing ⇒ page 212
12 - Rear left entry light -W33-
❑ 12 V, 3 W

210 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

❑ Removing and installing ⇒ page 212

4.2 Removing and installing window regula‐

tor switches -E52- / -E54-
Removing
– Switch off ignition and take out ignition key.
– Insert screwdriver in hole at bottom of trim -1-.
– Starting at rear, carefully prise trim off door trim -arrow-.

– Carefully release retaining hooks -arrows- using a small

screwdriver.

cardiagn.com
– Press window regulator switch -2- out of switch mounting -1-.
– Unplug electrical connector -3-.
Installing
Installation is carried out in the reverse order; note the following:
– Press window regulator switch into switch mounting until re‐
taining hooks engage.
– Fit trim for armrest ⇒ Rep. Gr. 70 .

4.3 Removing and installing rear left interior

locking switch -E273- / rear right interior
locking switch -E274-
Removing
– Switch off ignition and take out ignition key.
– Remove door trim (rear) ⇒ Rep. Gr. 70 .
– Unplug electrical connector -1-.
– Release retainers -arrows- and press interior locking switch
-2- out of door trim.
Installing Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Installation is carried out in the reverse order; note
withthe following:
respect to the correctness of information in this document. Copyright by AUDI AG.

– Press interior locking switch into switch mounting until retain‐

ers engage.
– Install door trim (rear) ⇒ Rep. Gr. 70 .

4. Lights and switches in rear doors 211

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4.4 Removing and installing door opener il‐

lumination bulb -L110- / -L111-
Removing
– Remove rear door trim ⇒ Rep. Gr. 70 .
– Unplug electrical connector -1-.
– Turn bulb holder -2- anti-clockwise and pull out at door opener.
Installing
Installation is carried out in the reverse order; note the following:
– Insert door opener illumination bulb in opening and engage.
– Install rear door trim ⇒ Rep. Gr. 70 .

4.5 Removing and installing door contact

switch (rear) -F10- / -F11-
The door contact switch is located in the door lock and cannot be
renewed separately if defective.

cardiagn.com
– Removing and installing rear door lock ⇒ Rep. Gr. 58 .

4.6 Removing and installing rear entry light

-W33- / -W34- and rear door warning
lamp -W37- / -W38-
Removing
– Use flat screwdriver to press in retaining tab -1-authorised
and pry by out
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless AUDI AG. AUDI AG does not guarantee or accept any liability
door warning lamp/entry light -2-. with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -3-.

Door warning lamp:

– Carefully prise off cover over bulb -arrow-.

212 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Entry light:
– Release retaining clips -arrows- and detach cover -1- over
bulb.

All vehicles (continued):

– Take bulb -1- on back of door warning lamp/entry light out of
bulb holder -2-.
Installing
Installation is carried out in the reverse order; note the following:
– Attach cover at door warning light/entry light.

cardiagn.com
– Insert door warning light/entry light in opening and engage on
opposite side.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Lights and switches in rear doors 213

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5 Lights and switches in centre console

5.1 Overview of lights and switches in centre console

1 - Switch module for Charis‐

ma -E592-
❑ Only on vehicles equip‐
ped with MMI basic
❑ Depending on equip‐
ment
❑ With button 1 in switch
module for Charisma - Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
E593- , button 2 in permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
switch module for Cha‐ with respect to the correctness of information in this document. Copyright by AUDI AG.
risma -E594-
❑ Removing and installing
⇒ page 217
2 - Switch panel

cardiagn.com
❑ Only on vehicles equip‐
ped with MMI basic
❑ Depending on version:
with rear roller blind
switch -E149- , TCS/
ESP button -E256- ,
parking aid button -
E266-
❑ Removing and installing
⇒ page 217
3 - Start/stop operation button
-E693-
❑ Removing and installing
⇒ page 216
4 - Heated rear left seat switch
with regulator -E128-
❑ Removing and installing
⇒ page 217
5 - Electric socket
❑ With 12 V socket 2 -
U18- or 230 volt socket for AC/DC converter with socket, 12 V - 230 V -U13- (depending on equipment
version)
❑ With socket illumination bulb -L42-
❑ Exploded view ⇒ page 62
6 - Heated rear right seat switch with regulator -E129-
❑ Removing and installing ⇒ page 217
7 - Selector lever position display -Y26- with selector lever display illumination bulb -L101-
❑ Removing and installing ⇒ page 216
8 - Entry and start authorisation button -E408-
❑ Removing and installing ⇒ page 215
9 - Electromechanical parking brake button -E538- , auto-hold button -E540-
❑ Removing and installing ⇒ page 215

214 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5.2 Removing and installing electrome‐

chanical parking brake button -E538- ,
auto-hold button -E540-
Removing
– Vehicles equipped with MMI basic: Remove cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Remove multime‐
dia system operating unit -E380- ⇒ Rep. Gr. 91 .
– Release retaining clips -arrows- and press out electromechan‐
ical parking brake button -E538- / auto-hold button -E540-
-item 2- from multimedia system operating unit -E380-
-item 1-.

Note

As an example, illustration shows multimedia system operating

unit -E380- .

cardiagn.com
Installing
Installation is carried out in the reverse order; note the following:
– Vehicles equipped with MMI basic: Install cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Install multimedia
system operating unit -E380- ⇒ Rep. Gr. 91 .

5.3 Removing and installing entry and start

authorisation button -E408-
Special tools and workshop equipment required
♦ Wire ∅ 2 mm
Removing
– Vehicles equipped with MMI basic: Remove cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Remove multime‐
dia system operating unit -E380- ⇒ Rep. Gr. 91 .
– Use a wire ∅ 2 mm -item 2- to release retaining clips
-arrows-.
– Press entry and start authorisation button -E408- -item 1- out
of multimedia system operating unit -E380- -item 3-.

Note

As an example, illustration shows multimedia system operating

unit -E380- .

Installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Installation is carried
with respect out in the
to the correctness reversein order;
of information noteCopyright
this document. the following:
by AUDI AG.

– Vehicles equipped with MMI basic: Install cover for centre

console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Install multimedia
system operating unit -E380- ⇒ Rep. Gr. 91 .

5. Lights and switches in centre console 215

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5.4 Removing and installing start/stop oper‐

ation button -E693-
Removing
– Vehicles equipped with MMI basic: Remove cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Remove multime‐
dia system operating unit -E380- ⇒ Rep. Gr. 91 .
– Release retaining clips -arrows A- and press start/stop oper‐
ation button -E693- -item 1- out of multimedia system operat‐
ing unit -E380- -item 2- -arrow B-.

Note

As an example, illustration shows multimedia system operating

unit -E380- .

Installing
Installation is carried out in the reverse order; note the following:

cardiagn.com
– Vehicles equipped with MMI basic: Install cover for centre
console ⇒ Rep. Gr. 68 .
– Vehicles equipped with MMI convenience: Install multimedia
system operating unit -E380- ⇒ Rep. Gr. 91 .

5.5 Removing and installing selector lever

position display -Y26- with selector lever
display
Protected illumination bulb
by copyright. Copying for private -L101-
or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Special tools and workshop equipment required
with respect to the correctness of information in this document. Copyright by AUDI AG.

♦ Removal wedge -3409-

Removing
– Move selector lever to “S”.
– Switch off ignition.
– Carefully pry out selector lever boot at the side -arrows- using
removal wedge -3409- or a small screwdriver.
– Pull up the boot for selector lever and turn inside out.

216 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Release retaining spring -2- and detach selector lever display

unit -Y26- -item 1- -arrow-.
– Unplug electrical connector.
Installing
Install in reverse order.

5.6 Removing and installing switch panel in

centre console - vehicles equipped with
MMI basic
Removing
– Remove cover for centre console ⇒ Rep. Gr. 68 .

cardiagn.com
– Carefully release retaining hooks -arrows- using a small
screwdriver -2-.
– Press switch panel -1- out of switch mounting.
Installing
Installation is carried out in the reverse order; note
Protected the following:
by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Press switch panel into switch housing until catch
with respect engages
to the correctness of information in this document. Copyright by AUDI AG.
with a click.
– Install cover for centre console ⇒ Rep. Gr. 68 .

5.7 Heated rear seat switches with regulator

-E128- / -E129-
Removing
– Remove rear trim panel for centre console ⇒ Rep. Gr. 68 .
– Release retaining clip -arrows- and take heated rear seat
switch -2- with regulator out of rear trim panel for centre con‐
sole -1-.
Installing
Installation is carried out in the reverse order; note the following:
– Fit rear trim panel for centre console ⇒ Rep. Gr. 68 .

5. Lights and switches in centre console 217

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6 Lights and switches in front seats,

luggage compartment

6.1 Overview of lights and switches in front seats, luggage compartment

1 - Rear left footwell light -W45-

❑ Removing and installing
⇒ page 219
2 - 12 V socket 3 -U19-
❑ Saloon
❑ Removing and installing
⇒ page 69
3 - Luggage compartment light
-W3-
❑ Saloon
❑ 12 V, 5 W

cardiagn.com
❑ Removing and installing
⇒ page 219
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
4 - Rear lid contact switch permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

❑ Saloon
with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ Removing and installing

⇒ page 221
5 - Luggage compartment light
on left -W18-
❑ Avant
❑ 12 V, 5 W
❑ Removing and installing
⇒ page 220
6 - Surround lighting 1 in rear
lid -W61-
❑ Avant
❑ 12 V, 5 W
❑ Removing and installing
⇒ page 220
7 - Button to close rear lid in
luggage compartment -E406-
❑ Avant
❑ Removing and installing ⇒ page 221
8 - Rear lid contact switch
❑ Avant
❑ Removing and installing ⇒ page 221
9 - Luggage compartment light -W3-
❑ Avant
❑ 12 V, 5 W
❑ Removing and installing ⇒ page 220
10 - 12 V socket 3 -U19-
❑ Avant
❑ Removing and installing ⇒ page 70

218 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11 - Rear right footwell light -W46-

❑ Removing and installing ⇒ page 219

6.2 Removing and installing footwell light

(rear) -W45- / -W46-
Removing
– Use flat-bladed screwdriver to press in retaining tab -2- and
pry out footwell light -1-.
– Unplug electrical connector.
Installing
Installation is carried out in the reverse order; note the following:

Note

If the LED is defective, the complete footwell light must be re‐

newed.

cardiagn.com
– Insert footwell light in opening and engage on opposite side.

6.3 Removing and installing luggage com‐

partment light -W3- - saloon
Removing
– Use a flat screwdriver to press in retaining tab -1- and pry out
luggage compartment light -2-.
– Unplug electrical connector -3-.

– Remove bulb -1- from bulb holder -2- on reverse side of lug‐
gage compartment light.
Installing
Installation is carried out in the reverse order; note the following:
– Plug in electrical connector.
– Insert luggage compartment light in opening and engage on
opposite side.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

6. Lights and switches in front seats, luggage compartment 219

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.4 Removing and installing luggage com‐

partment light -W18- / -W3- / -W61- -
Avant
Removing
– Use a flat screwdriver to press in retaining tab -1- and pry out
luggage compartment light -2-.
– Unplug electrical connector -3-.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Light in rear lid:

– Carefully prise off cover over bulb -arrow-.

All units (continued):

– Remove bulb -1- from bulb holder -2- on reverse side of lug‐
gage compartment light.
Installing
Installation is carried out in the reverse order; note the following:
– Fit cover on light in rear lid.
– Plug in electrical connector.
– Insert luggage compartment light in opening and engage on
opposite side.

220 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6.5 Removing and installing rear lid contact

switch
The rear lid contact switch -arrow- is located in the rear lid lock
and cannot be renewed separately in the event of a fault.
– Removing and installing rear lid lock ⇒ Rep. Gr. 55 .

6.6 Removing and installing button to close

rear lid in luggage compartment -E406-
- Avant
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Removing
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Switch off ignition and take out ignition key.

cardiagn.com
– Release retaining clips -arrows- at button to close rear lid in
luggage compartment -E406- -item 1-.
– Guide button carefully out of rear lid trim.
– Unplug electrical connector.
Installing
Install in reverse order.

6. Lights and switches in front seats, luggage compartment 221

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7 Lights and switches in roof trim

Observe notes on contact corrosion ⇒ page 194 .

7.1 Overview of lights and switches in roof trim

1 - Garage door operation con‐

trol unit -J530-
❑ Removing and installing
⇒ page 226
2 - Humidity sender -G355-
❑ Exploded view
⇒ page 230
3 - Interior light/reading light
(front)
❑ Front interior light -W1-
❑ Front passenger read‐
ing light -W13-
❑ Driver side reading light

cardiagn.com
-W19-
❑ Removing and installing
⇒ page 224
4 - Garage door operating unit
-E284-
❑ Removing and installing
⇒ page 227
5 - Sliding sunroof adjustment
regulator -E139-
❑ Removing and installing
⇒ page 226
6 - Interior light/reading light
(rear)
❑ Rear left interior light -
W47-
❑ Rear right interior light -
W48-
❑ Removing and installing
interior light (rear)
⇒ page 227
❑ Removing and installing interior light/reading light (rear) ⇒ page 228
7 - Vanity mirror light bulb -L31-
❑ 12 V, 5 W Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ Removing and installing ⇒ page 223 with respect to the correctness of information in this document. Copyright by AUDI AG.

222 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Interior light/reading light (front) - tightening torque

1- Bolt, 1.6 Nm
2- Sunglasses compartment
3- Interior light/reading light (front)

Tightening torque for sliding sunroof adjustment regulator -E139-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Tighten bolts -arrows- to 1 Nm. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
7.2 Removing and installing vanity mirror
light bulb -L31-
Removing
– Carefully pry out vanity mirror light at slot -arrow- using a flat
screwdriver.
– Unplug electrical connector.

– Detach cover -arrow- to renew bulb.

– Remove bulb on reverse side of vanity mirror light from bulb
holder.
Installing
Install in reverse order.

7.3 Removing and installing contact switch

for vanity mirror -F147- / -F148-
The contact switch for the vanity mirror is located in the sun visor
bracket and cannot be renewed separately if defective.

7. Lights and switches in roof trim 223

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Removing and installing sun visor ⇒ Rep. Gr. 70 .

7.4 Removing and installing interior light/

reading light (front)
Removing
– Switch off ignition and take out ignition key.
– Open sunglasses compartment -2-.
– Remove bolt -1-.
– Pivot the interior light/reading light (front) -3- downwards and
remove from roof trim.
– Unplug electrical connectors.
Installing
• Tightening torque ⇒ page 223
Installation is carried out in the reverse order; note the following:
– Fit interior light and secure.

cardiagn.com
7.5 Renewing bulbs for front interior light -
W1-
Special tools and Protected
workshop equipment required
by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
♦ Removal wedge with
-3409-
respect to the correctness of information in this document. Copyright by AUDI AG.

Removing
– Apply tip of removal wedge -3409- to ribs on trim -1- for hands-
free microphone.
• The felt strip on the underside of the trim must not be dam‐
aged.
– Carefully lever off trim -arrow-.

224 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Carefully slide tip of removal wedge -3409- under centre of

lens -1-, disengage four retaining tabs and detach lens
-arrows-.

– Take bulb -1- or -2- (12 V, 10 W) out of clamp-type bulb holder.

cardiagn.com
– Fit the four retaining tabs on lens -1- in light housing
-arrows- and press down on rear edge until they engage.
Installing
Install in reverse order.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

7.6 Renewing reading light bulbs (front) -

W13- / -W19-
Removing
– Remove interior light/reading light (front) ⇒ page 224 .
– Unscrew bulb holder -1- or -2- out of interior light/reading light
-3-.
– Unscrew bulb (12 V, 5 W) from bulb holder.
Installing
Installation is carried out in the reverse order; note the following:
– Install interior light/reading light (front) ⇒ page 224 .

7. Lights and switches in roof trim 225

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7.7 Removing and installing sliding sunroof

adjustment regulator -E139-
Removing
– Remove interior light/reading light (front) ⇒ page 224 .
– Unplug electrical connector -2-.
– Remove bolts -arrows-.
– Take sliding sunroof adjustment regulator -E139- -item 1- out
of front interior light/reading light.
Installing
• Tightening torque ⇒ page 223
Installation is carried out in the reverse order; note the following:
– Install interior light/reading light (front) ⇒ page 224 .

7.8 Removing and installing LED for back‐

ground lighting

cardiagn.com
Removing
The LED for background lighting is located in the interior light/
reading light (front) and cannot be renewed separately if defec‐
tive.
– Removing and installing interior light/reading light (front)
⇒ page 224

7.9 Removing and installing garage door

operation control unit -J530-
Removing
– Remove bolts -1, 2, 3, 5- for fasteners.
– Lift cover -4- on lock carrier -arrow- and detach from radiator
grille.

– Unplug electrical connector -1-.

– Release retaining clip -arrow- and remove garage door
Protected oper‐ Copying for private or commercial purposes, in part or in whole, is not
by copyright.
ation control unit -J530- -item 2- from frame. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Installing
Installation is carried out in the reverse order; note the following:
– Install lock carrier cover at radiator grille ⇒ Rep. Gr. 63 .

226 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7.10 Removing and installing garage door

operating unit -E284-
Removing
– Remove interior light/reading light (front) ⇒ page 224 .
– If fitted, remove anti-theft alarm sensor -G578- ⇒ page 244 .
– Release retaining clips -arrows- and remove garage door op‐
erating unit -E284- -item 1- from interior light/reading light
(front) -2-.
Installing
Installation is carried out in the reverse order; note the following:
– Install interior light/reading light (front) ⇒ page 224 .

7.11 Removing and installing rear interior

light
Special tools and workshop equipment required

cardiagn.com
♦ Removal lever -80 - 200-

Removing
– Carefully pry interior light/reading light -1- out of opening in
headliner using removal lever -80 - 200- -arrow-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Unplug electrical connector. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Installing
Installation is carried out in the reverse order; note the following:
– Insert interior light/reading light in opening in headliner and clip
into place.

7.12 Renewing bulb for rear interior light -

W47- / -W48-
Special tools and workshop equipment required

7. Lights and switches in roof trim 227

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal lever -80 - 200-

Removing
– Release the lens -1- for interior light using removal lever -80 -
200- .
– Pull bulb -2- or -3- (12 V, 5 W) out of bulb holder.
Installing
Installation is carried out in the reverse order; note the following:

cardiagn.com
– Press on lens for interior light until it engages.

7.13 Removing and installing interior light/

reading light (rear)
Special tools and workshop equipment required
♦ Removal wedge -3409-

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

228 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Removing
– Carefully pry interior light/reading light -1- out of opening in
headliner using removal wedge -3409- -arrow-.
– Unplug electrical connector.
Installing
Installation is carried out in the reverse order; note the following:
– Insert interior light/reading light in opening in headliner and clip
into place.

7.14 Renewing bulb for rear interior light/

reading light -W47- / -W48-
Special tools and workshop equipment required
♦ Removal wedge -3409-

cardiagn.com
Removing
– Release the lens -1- for interior light/reading light using re‐
moval wedge -3409- -arrow-.
– Remove bulb -2- or -3- (12 V, 5 W) from bulb holder.
Installing
Installation is carried out in the reverse order; notebythe
Protected following:
copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Press on lens for interior light until it engages.
with respect to the correctness of information in this document. Copyright by AUDI AG.

7. Lights and switches in roof trim 229

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

8 Components on interior mirror

8.1 Exploded view of main beam assist system, humidity sender and lane de‐
parture warning system

1 - Cover (front)
❑ For housing for head‐
light assistant control
unit -J844- with light
sensor -G399-
2 - Bolt Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ 2.4 Nm permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
3 - Main beam assist
❑ If defective, headlight
assistant control unit -
J844- with light sensor -
G399- cannot be re‐

cardiagn.com
newed separately. The
interior mirror must be
renewed as a complete
unit ⇒ Rep. Gr. 68
4 - Cover (top)
5 - Interior mirror
6 - Cover (top)
❑ For lane departure
warning control unit -
J759-
7 - Lane departure warning
control unit -J759-
❑ Removing and installing
⇒ Rep. Gr. 44
8 - Cover (bottom)
❑ For lane departure
warning control unit -
J759-
9 - Cover (rear)
10 - Central connector
11 - Humidity sender -G355-
❑ Vehicles without main beam assist: removing and installing ⇒ page 231
❑ Vehicles with main beam assist: removing and installing ⇒ page 232

230 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

8.2 Removing and installing humidity send‐

er -G355- - vehicles without main beam
assist
Removing
Vehicles with lane departure warning:
– Unclip cover -1- (top) at mirror base -arrows-.
– Use a screwdriver to disengage cover (bottom) at mirror base
and detach.

Vehicles without lane departure warning:

– Pry open cover -1- (top) at interior mirror base -arrows-.

cardiagn.com
All vehicles (continued):
– Remove the electrical connector from its retainer.
– Unplug electrical connector -2-.
– Turn interior mirror at mirror base -1- anti-clockwise -arrow- as
far as the stop.
– Remove interior mirror from the retaining plate. by AUDI AG. AUDI AG does not guarantee or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Press cover -1- apart slightly at both sides -arrows- and detach
from interior mirror base -2-.

8. Components on interior mirror 231

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -2-.

– Use a small screwdriver -3- to carefully pry humidity sender -
G355- -item 4- out of cover -1- -arrow-, lifting off at the same
time.
Installing
Installation is carried out in the reverse order; note the following:
– Carefully insert humidity sender -G355- in side guides.

Note

The cover cannot be installed if the humidity sender -G355- is not

fitted correctly.

– Install interior mirror ⇒ Rep. Gr. 68 .

8.3 Removing and installing humidity send‐

cardiagn.com
er -G355- - vehicles with main beam
assist
Removing
Vehicles with lane departure warning:
– Unclip cover -1- (top) at mirror base -arrows-.
– Use a screwdriver to disengage cover (bottom) at mirror base
and detach.

Vehicles without lane departure warning:

– Pry open cover -1- (top) at interior mirror base -arrows-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

232 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All vehicles (continued):

– Remove the electrical connector from its retainer.
– Unplug electrical connector -2-.
– Turn interior mirror at mirror base -1- anti-clockwise -arrow- as
far as the stop.
– Remove interior mirror from the retaining plate.

– Release retaining tabs -1- and -2- with a screwdriver -3-.

– Disengage cover -4- (rear).

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Release retaining tabs -arrows- and carefully fold cover -2-

(top) slightly upwards.
– Disengage retaining tab -1- at cover -3- (front).
– Detach cover (top).

8. Components on interior mirror 233

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Disengage retaining hooks in direction of -arrows- and pull

cover -2- (front) out of guide webs at interior mirror base -1-
downwards.

– Remove bolt -1- and detach housing -2- for headlight assistant
control unit -J844- with light sensor -G399- ; to do so, pull re‐
taining tab -arrow- out of interior mirror base -3-.

cardiagn.com
– Release retaining clips -2- -arrows- and detach humidity send‐
er -G355- -item 4- from interior mirror base -1-.
– Unplug electrical connector -3-.
Installing
• Tightening torque ⇒ page 230
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Installation is carried out in the reverse order;
permitted note
unless the following:
authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install interior mirror ⇒ Rep. Gr. 68 .

234 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9 Entry and start authorisation system

9.1 Overview of entry and start authorisation system

1 - Entry and start authorisa‐

tion switch -E415-
❑ Fitting location: in dash
panel on driver's side
❑ Removing and installing
⇒ page 184
2 - Convenience system cen‐
tral control unit -J393-
❑ Fitting location: behind
luggage compartment
side trim (right-side)
❑ Removing and installing Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

⇒ page 286
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
3 - Central locking and anti-
theft alarm system aerial -R47-
❑ Integrated in rear win‐
dow
❑ Removing and installing
⇒ Rep. Gr. 91
4 - Electronic steering column
lock control unit -J764-
❑ Removing and installing
⇒ Rep. Gr. 48

9. Entry and start authorisation system 235

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.2 Overview of keyless entry system

1 - Entry and start authorisa‐

tion button -E408-
❑ Fitting location for MMI
basic equipment: in cov‐
er for centre console
❑ Fitting location for MMI
convenience equip‐
ment: in mounting frame
for multimedia system
operating unit -E380-
❑ Removing and installing
⇒ page 215
2 - Electronic steering column
lock control unit -J764-
❑ Removing and installing
⇒ Rep. Gr. 48
3 - Front passenger's exterior
door handle

cardiagn.com
❑ With contact sensor for
front right exterior door
handle -G606-
❑ Exploded view
⇒ page 238
4 - Rear exterior doorProtected
handle by copyright. Copying for private or commercial purposes, in part or in whole, is not

(passenger side)
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ With rear right door ex‐
terior door handle touch
sensor -G418-
❑ Exploded view
⇒ page 238
5 - Convenience system cen‐
tral control unit -J393-
❑ Fitting location: behind
luggage compartment
side trim (right-side)
❑ Removing and installing ⇒ page 286
6 - Luggage compartment aerial for entry and start authorisation -R137-
❑ Fitting location: on luggage compartment rear cross panel (left-side)
❑ Removing and installing ⇒ page 242
7 - Central locking and anti-theft alarm system aerial -R47-
❑ Integrated in rear window
❑ Removing and installing ⇒ Rep. Gr. 91
8 - Rear exterior door handle (driver side)
❑ With rear left door exterior door handle touch sensor -G417-
❑ Exploded view ⇒ page 238
9 - Left aerial for entry and start authorisation -R200-
❑ Fitting location: on rear left door
❑ Removing and installing ⇒ page 241
10 - Driver's exterior door handle
❑ With contact sensor for front left exterior door handle -G605-
❑ Exploded view ⇒ page 238

236 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11 - Interior aerial 1 for entry and start authorisation -R138-

❑ Fitting location: beneath front centre console
❑ Removing and installing ⇒ page 241

Interior aerial 1 for entry and start authorisation -R138- - tighten‐

ing torque
1- Interior aerial 1 for entry and start authorisation -R138-
2- Mounting
3- Electrical connector
4- Bolt, 2 Nm

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
Left aerial for entry and start authorisation -R200- - tightening tor‐
que
– Tighten bolts -arrows- on left aerial for entry and start author‐
isation -R200- to 2 Nm.

Luggage compartment aerial for entry and start authorisation -

R137- - tightening torque
– Tighten nuts -arrows- on luggage compartment aerial for entry
and start authorisation -R137- to 2 Nm.

9. Entry and start authorisation system 237

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.3 Exploded view of exterior door handle for keyless entry system

1 - Exterior door handle touch

sensor
❑ In exterior door handle
Front door:
❑ Contact sensor for front
left exterior door handle
-G605- , contact sensor
for front right exterior
door handle -G606-
❑ Removing and installing
⇒ page 239
Rear door:
❑ Rear left door exterior
handle touch sensor -
G417- , rear right door
exterior handle touch
sensor -G418-

cardiagn.com
❑ Removing and installing
⇒ page 240
2 - Door lock
3 - Guide
❑ For lock cylinder
4 - Mounting bracket
5 - Lock cylinder
❑ Only on driver's side
6 - Cap Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ Driver's side: for lock permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

cylinder
with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ Passenger's side: with‐

out opening
7 - Exterior door handle

238 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.4 Removing and installing contact sensor

for front left/front right exterior door han‐
dle -G605- / -G606-
Removing
– Remove exterior door handle ⇒ Rep. Gr. 57 .
– Release retaining tabs -arrows A- and take out electrical con‐
nector -3-.
– Use a small screwdriver to carefully release retaining hooks
-arrows B- and detach wiring guide.

Note

Disregard -items 1, 2-.

cardiagn.com
– Apply screwdriver at exterior door handle, as shown in illus‐
tration.
– Slightly turn screwdriver and press contact sensor for exterior
door handle towards front out of retainer at exterior door han‐
dle.
– Pull contact sensor for front exterior door handle out of exterior
door handle.
Installing
Installation is carried out in the reverse order; note the following:
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Press in contact sensor for front exterior door handle so that
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

it engages audibly.
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Install exterior door handle ⇒ Rep. Gr. 57 .

9. Entry and start authorisation system 239

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.5 Removing and installing touch sensor

for rear exterior door handle -G417- / -
G418-
Removing
– Remove exterior door handle ⇒ Rep. Gr. 58 .
– Release retaining tabs -arrows A- and take out electrical con‐
nector -3-.
– Use a small screwdriver to carefully release retaining hooks
-arrows B- and detach wiring guide.

Note

Disregard -items 1, 2-.

cardiagn.com
– Apply screwdriver at exterior door handle, as shown in illus‐
tration.
– Slightly turn screwdriver and press contact sensor for exterior
door handle towards front out of retainer at exterior door han‐
dle.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Pull contact sensor for front exterior door handle permitted
out of exterior
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
door handle. with respect to the correctness of information in this document. Copyright by AUDI AG.

Installing
Installation is carried out in the reverse order; note the following:
– Press in contact sensor for front exterior door handle so that
it engages audibly.
– Install exterior door handle ⇒ Rep. Gr. 58 .

240 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.6 Removing and installing interior aerial 1

for entry and start authorisation -R138-
Removing
Vehicles equipped with MMI basic:
– Remove cover for centre console ⇒ Rep. Gr. 68 .
Vehicles equipped with MMI convenience:
– Remove multimedia system operating unit -E380- ⇒ Rep. Gr.
91 .
All vehicles (continued):
– Unplug electrical connector -3-.
– Remove bolt -4-.
– Detach interior aerial 1 for entry and start authorisation -R138-
-item 1-.
Installing
• Tightening torque ⇒ page 237

cardiagn.com
Installation is carried out in the reverse order; note the following:
– When installing, make sure that interior aerial 1 for entry and
start authorisation -R138- engages in mounting -2-.
Vehicles equipped with MMI basic:
– Install cover for centre console ⇒ Rep. Gr. 68 .
Vehicles equipped with MMI convenience:
– Install multimedia system operating unit -E380- ⇒ Rep. Gr.
91 .

9.7 Removing and installing left aerial for

entry and start authorisation -R200-
Removing
– Remove rear door trim ⇒ Rep. Gr. 70 .
– Remove bolts -arrows- and detach left aerial for entry and start
authorisation -R200- -item 2-.
– Unplug electrical connector -1-.Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Installing
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

• Tightening torque ⇒ page 237

Installation is carried out in the reverse order; note the following:
– Install rear door trim ⇒ Rep. Gr. 70 .

9. Entry and start authorisation system 241

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9.8 Removing and installing luggage com‐

partment aerial for entry and start au‐
thorisation -R137-
Removing
– Fold open luggage compartment floor.
– On some versions, the mounting for tool kit must be removed.
– Remove nuts -arrows-.
– Detach luggage compartment aerial for entry and start author‐
isation -R137- -item 1-.
– Unplug electrical connector -2-.
Installing
• Tightening torque ⇒ page 237
Install in reverse order.

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

242 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10 Ultrasonic interior monitoring

♦ The interior monitor send and receive module 1 -G303- and
the anti-theft and tilt system control unit -J529- have been
combined in one component, referred to as the anti-theft alarm
sensor -G578- .
♦ The convenience system central control unit -J393- therefore
only has two “LIN nodes” on vehicles with the optional “anti-
theft alarm”.

10.1 Overview of ultrasonic interior monitoring

1 - Alarm horn -H12-

❑ Removing and installing
⇒ page 245
2 - Nut
❑ 5 Nm
3 - Nut
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ 7 Nm

cardiagn.com
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
4 - Bracket for alarm horn -
H12-
5 - Convenience system cen‐
tral control unit -J393-
❑ Removing and installing
⇒ page 286
6 - Mounting bracket for control
units
7 - Central locking and anti-
theft alarm system aerial -R47-
❑ Is integrated in rear win‐
dow
❑ Removing and installing
⇒ Rep. Gr. 91
8 - Anti-theft alarm sensor -
G578-
❑ Removing and installing
⇒ page 244
9 - Interior light/reading light
(front)
10 - Individual sensor for inte‐
rior monitor (front)
❑ Can only be renewed to‐
gether with anti-theft
alarm sensor -G578-

10. Ultrasonic interior monitoring 243

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10.2 Removing and installing interior moni‐

toring switch -E183- / alarm system off
switch -E217-
Removing
– Switch off ignition and take out ignition key.
– Carefully pry trim -1- out of door trim -arrow- using a small
screwdriver -2-.
– Unplug electrical connector.

– Carefully release retaining hooks -arrows- using a small

screwdriver.
– Remove interior monitoring switch -E183- / alarm system off

cardiagn.com
switch -E217- -item 1- from trim -2- towards rear.
Installing
Install in reverse order.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

10.3 Removing and installing anti-theft alarm

sensor -G578-
Removing
– Remove interior light/reading light (front) ⇒ page 224 .
– Release retaining clips -arrows B- and remove individual sen‐
sor for anti-theft alarm -item 1- from interior light/reading light.
– Move electrical wire -2- clear.
– Release retaining clips -arrows A- and remove anti-theft alarm
sensor -G578- -item 3- from interior light/reading light.

244 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Press retaining clips to one side -arrow A- and take anti-theft

alarm sensor -G578- -item 1- out of mounting -2-.
– Release retaining clips -arrows B- and press individual sen‐
sors -3- for anti-theft alarm out of mounting.
Installing
Installation is carried out in the reverse order; note the following:
– Install interior light/reading light (front) ⇒ page 224 .

10.4 Removing and installing alarm horn -

cardiagn.com
H12-
Removing
Vehicles up to 05.2008:
– Unclip plenum chamber covers -1- and -2- and detach.

Note

Disregard -item 3- and -arrow-.

Vehicles from 06.2008 onwards:

– Remove bolts -3-.
– Unclip retaining clips -2- from retainer and detach plenum
chamber cover -1-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

10. Ultrasonic interior monitoring 245

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All vehicles (continued):

– Remove nut -3-.
– Unplug electrical connector -1-.
– Take out alarm horn -H12- -item 2- upwards.
Installing
• Tightening torque ⇒ page 243
Installation is carried out in the reverse order; note the following:
– Engage retaining tab in recess on mounting bracket.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

246 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11 Lane change assist

11.1 Overview of lane change assist

1 - Lane change assist warning

lamp in driver side exterior mir‐
ror -K233-
❑ Removing and instal‐
ling:
♦ Vehicles up to 05.2009
⇒ page 248
♦ Vehicles from 06.2009 on‐
copyright.⇒
Protected bywards pagefor249
Copying private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with 2 - Button
respect for laneofchange
to the correctness informationas‐
in this document. Copyright by AUDI AG.
sist -E530-
❑ Removing and installing
⇒ page 248

cardiagn.com
3 - Lane change assist warning
lamp in front passenger side
exterior mirror -K234-
❑ Removing and instal‐
ling:
♦ Vehicles up to 05.2009
⇒ page 248
♦ Vehicles from 06.2009 on‐
wards ⇒ page 249
4 - Bolt
❑ 3.5 Nm
5 - Electrical connector
6 - Bolt
❑ 3.5 Nm
7 - Lane change assist control
unit -J769-
❑ Removing and installing
⇒ page 251
8 - Lane change assist control unit 2 -J770-
❑ Removing and installing ⇒ page 251
9 - Bolt
❑ 3.5 Nm
10 - Electrical connector
11 - Bolt
❑ 3.5 Nm

11. Lane change assist 247

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11.2 Removing and installing button for lane

change assist -E530-
Removing
– Switch off ignition and take out ignition key.
– Remove trim panel for treble loudspeaker ⇒ Rep. Gr. 70 .
– Pull button for lane change assist -E530- -item 2- out of re‐
tainer -arrow-.
– Unplug electrical connector -1-.
Installing
Installation is carried out in the reverse order; note the following:
– Fit trim panel for treble loudspeaker ⇒ Rep. Gr. 70 .

11.3 Removing and installing lane change

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
assist warning lamp in exterior mirror -
with respect to the correctness of information in this document. Copyright by AUDI AG.

K233- / -K234- - vehicles up to 05.2009

cardiagn.com
Removing
– Remove mirror glass ⇒ Rep. Gr. 66 .

Note

Mask the area around the mirror housing with a soft cloth to pro‐
tect the paintwork.

– Remove bolts -4- and -5-.

– Release retaining tabs -3- in direction of -arrow A-.
– Release retaining clip -1- and detach exterior mirror housing
-2- from cover -arrows B-.

– Press mirror adjustment unit downwards and lift exterior mirror

housing -1- off slightly.
– Unplug electrical connector -2- for lane change assist warning
lamp at front side of mounting -3- for mirror adjustment unit.

248 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Lift exterior mirror housing and unplug electrical connector

-3-.

Note

-Items 1, 2, 4- and -arrow- can be disregarded.

– Release retainers -arrows A- and press lane change assist

warning lamp -1- out of exterior mirror housing -2- -arrow B-.
Installing
Installation is carried out in the reverse order; note the following:

Note

cardiagn.com
Warning lamp for lane change assist in exterior mirror must be
replaced completely with a new unit if an LED is defective.

– Install exterior mirror housing ⇒ Rep. Gr. 66 .

11.4 Removing and installing lane change

assist warning lamp in exterior mirror -
K233- / -K234- - vehicles from 06.2009
onwards
Removing
– Remove mirror adjustment unit ⇒ Rep. Gr. 66 .

Note

Mask the area around the mirror housing with a soft cloth to pro‐
tect the paintwork.

– Remove bolts -4- and -5-.

– ReleaseProtected
retaining clip -2- and detach exterior mirror housing
-3- from cover
permitted-1- -arrows-.
by copyright. Copying for private or commercial purposes, in part or in whole, is not
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

11. Lane change assist 249

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Only pull out exterior mirror housing -1- until electrical con‐
nector becomes visible.
– Unplug electrical connector -2- at front side of mounting -3- for
mirror adjustment unit.

– Lift off exterior mirror housing -2- and unplug electrical con‐
nector -3-.

Note
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Disregard -items 1, 4, 5- and -arrow-.

cardiagn.com
– Release retainers -arrows A- and press lane change assist
warning lamp -1- out of exterior mirror housing -2- -arrow B-.
Installing
Installation is carried out in the reverse order; note the following:

Note

Warning lamp for lane change assist in exterior mirror must be

replaced completely with a new unit if an LED is defective.

– Install exterior mirror housing ⇒ Rep. Gr. 66 .

250 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11.5 Removing and installing lane change

assist control unit -J769- / -J770-
Removing
– Remove rear bumper cover ⇒ Rep. Gr. 63 .
– Unplug electrical connector -3-.
– Remove bolts -1- and -2-.
– Pull lane change assist control unit out of mounting on bumper
-arrow-.
Installing
Installation is carried out in the reverse order; note the following:
– Install rear bumper cover ⇒ Rep. Gr. 63 .
Lane change assist control unit -J769- / -J770- must be recali‐
brated whenever bumper cover has been removed
⇒ “11.6 Calibrating lane change assist - test equipment layout”,
page 251 .

cardiagn.com
11.6 Calibrating lane change assist - test equipment layout

1 - Spacing laser -VAS 6350/2-

❑ For distance measure‐
ment Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ For use referwithtorespect
⇒ oper‐
to the correctness of information in this document. Copyright by AUDI AG.
ating instructions
2 - Calibration unit -VAS 6350-
3 - Spirit level
❑ On calibration unit -VAS
6350-
❑ For checking horizontal
position of calibration
unit -VAS 6350-
4 - Locating bracket
❑ For mounting spacing
laser -VAS 6350/2- for
distance measurement
❑ Distance to wheel cen‐
tre mountings -VAS
6350/1- on rear wheels:
dimension
-a- = 1,700 ± 2 mm
5 - Wheel centre mounting -
VAS 6350/1-
❑ With wheel bolt adapter
(19 mm) and measuring
paddle
6 - Logo
❑ Laser pointer is aligned
with centre of logo
7 - Calibration unit for lane
change assist -VAS 6350/4-
❑ Is moved from right to
left side of measuring
field during calibration

11. Lane change assist 251

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

❑ Voltage supply must be connected to bottom left of calibration unit for lane change assist (in direction of
travel)
8 - Measuring scale
❑ For positioning the calibration unit for lane change assist -VAS 6350/4-
9 - Linear laser -VAS 6350/3-
❑ With “laser protection goggles”
❑ On calibration unit -VAS 6350-
❑ Switching on and off ⇒ Operating instructions
10 - Plastic foot
❑ 3x
❑ Adjustable, for aligning horizontal position of calibration unit -VAS 6350-

11.7 Calibrating lane change assist control

unit -J769- / -J770-
Special tools and workshop equipment required
♦ Calibration unit -VAS 6350-

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Requirements
– The lane change assist control unit -J769- / -J770- must be
calibrated in “Guided Fault Finding” or “Guided Functions”
mode ⇒ Vehicle diagnosis, testing and information system
VAS 5051 under the following conditions:
• If lane change assist control unit -J769- or lane change assist
control unit 2 -J770- has been renewed.
• If the rear bumper cover has been damaged, for instance when
parking the car.
• If the rear bumper cover has been removed and installed.
• If the fault memory contains the entry “no or incorrect basic
setting/adaption”.
Preparations
– The vehicle must be standing on a firm and even surface.
– Apply parking brake – the vehicle must not be moved while the
calibration procedure is being performed.
– Make sure steering wheel is at centre position with wheels
pointing straight ahead.
– Connect vehicle diagnostic tester ⇒ Vehicle diagnosis, testing
and information system VAS 5051.

252 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Note

If a fault message appears on the display, refer to ⇒ Operating

instructions for vehicle diagnostic tester .

– Switch on ignition.
– Remove any stickers with metal film from the bumper cover.
– Fit three wheel bolt adapters (19 mm) onto each wheel centre
mounting -VAS 6350/1- .
– Fit measuring paddle onto each of the wheel centre mountings
-VAS 6350/1- and secure each paddle with lock nut.
– Fit wheel centre mountings -VAS 6350/1- onto wheel bolts on
both rear wheels.
• Centre of rotation of wheel centre mounting must align with
centre of rotation of wheel.

Note

cardiagn.com
When fitting the wheel centre mountings -VAS 6350/1- onto the
wheels, make sure that the “anti-theft wheel bolts” do not come
into contact with the wheel centre mounting.

– Use lock nuts to adjust measuring paddles so that they are

free to move just slightly above the ground.
• Measuring paddles must move freely.Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• Measuring paddle must be in an uprightwith
position.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
respect to the correctness of information in this document. Copyright by AUDI AG.

– Position the calibration unit -VAS 6350- at a distance of -a-

from rear wheels.
• Dimension -a- = 1,700 mm

– Switch on spacing laser -VAS 6350/2- by pressing ON button.

Display on -VAS 6350/2- :
• “- - - m”

Note

The laser is switched on simultaneously.

11. Lane change assist 253

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– To measure distance, hold spacing laser -VAS 6350/2-

-item 2- flush with locating bracket as shown in illustration.
• Spacing laser -VAS 6350/2- must be steady and flush with lo‐
cating bracket.
– Make sure that laser beam for distance measurement hits
lower (larger) part of measuring paddle -1-.
If this is not the case, adjust height of measuring paddles using
lock nuts on wheel centre mountings -VAS 6350/1- .

– Press ON button briefly to measure distance.

Display on -VAS 6350/2- :
• “1.700 m” (specification: 1700 ± 2 mm).
– Repeat measurement from locating bracket (left-side) to rear
left wheel.
• Measured distance value must be identical on both sides.

cardiagn.com
If the two measured values are not identical, re-align calibration
unit -VAS 6350- .
– Select function or path:
Vehicle brand
Vehicle type
Engine code
3C Lane change assist
J769 - Calibration (Repair Group 96)

Note

♦ The system will now inform you which lane change assist ver‐
sion is fitted in the vehicle (versions: 1.0 or 1.5).
♦ This information for setting the calibration unit is important for
the work sequence to be followed and to avoid malfunctions.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

254 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Secure calibration unit for lane change assist -VAS 6350/4- to

mounting bracket (rear right) on calibration unit -VAS 6350- .
• Voltage supply must be connected to bottom left of calibration
unit for lane change assist (in direction of travel)
Dimension -a- (measured between top edge of calibration unit
and ground).
• Saloon, Avant: dimension -a- = 700 mm
• allroad: dimension -a- = 770 mm
– Pointer at base of calibration unit for lane change assist -VAS
6350/4- must align with setting dimension on graduated scale
-1- at measuring field -arrow-.
Saloon with lane change assist (version 1.0):
• Setting dimension (right-side) = 586 mm (read off from meas‐
uring scale -1-).
Saloon with lane change assist (version 1.5):
• Setting dimension (right-side) = 745 mm (read off from meas‐
uring scale -1-).

cardiagn.com
Avant with lane change assist (version 1.5):
• Setting dimension (right-side) = 745 mm (read off from meas‐
uring scale -1-).
allroad with lane change assist (version 1.5):
• Setting dimension (right-side) = 830 mm (read off from meas‐
uring scale -1-).
All vehicles (continued):
– Connect calibration unit for lane change assist -VAS 6350/4-
up to voltage supply.

– Align calibration unit -VAS 6350- horizontally by turning plastic

feet.
• Check spirit level on calibration unit -VAS 6350- -arrow-.

– Switch on linear laser -VAS 6350/3- on calibration unit -VAS

6350-
Protected . Copying for private or commercial purposes, in part or in whole, is not
by copyright.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– respect
with Put on “laser
to the protection
correctness goggles”.
of information in this document. Copyright by AUDI AG.

– Align calibration unit -VAS 6350- so that beam from linear laser
-VAS 6350/3- hits centre of logo on rear lid.

11. Lane change assist 255

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Check distance (left and right) between locating brackets of

calibration unit -VAS 6350- and measuring paddles -1- on
wheel mountings.
• Specification: 1,700 ± 2 mm
Calibration procedure
Please adhere to the following rules during the calibration proce‐
dure:
• Vehicle doors must not be opened or closed.
• No-one must sit in vehicle.
• Do not allow any person to walk between vehicle and calibra‐
tion unit for lane change assist -VAS 6350/4- .

Procedure
– Switch on calibration unit for lane change assist -VAS 6350/4-
with power switch -3-.
• The green LED -1- must light up. by copyright. Copying for private or commercial purposes, in part or in whole, is not
Protected
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
Note

If the red LED -2- lights up: check calibration unit for lane change
assist -VAS 6350/4- .

– Continue to follow the instructions on the display of the vehicle

diagnostic tester.

During the program, you are prompted to move the calibration unit
for lane change assist -VAS 6350/4- from the right to the left side
of the calibration unit -VAS 6350- .
– Switch off calibration unit for lane change assist -VAS 6350/4-
and move calibration unit to the other side.
• Voltage supply must be connected to bottom left of calibration
unit for lane change assist (in direction of travel)
Dimension -a- (measured between top edge of calibration unit
and ground).
• Saloon, Avant: dimension -a- = 700 mm
• allroad: dimension -a- = 770 mm
– Pointer at base of calibration unit for lane change assist -VAS
6350/4- must align with setting dimension on graduated scale
-1- at measuring field -arrow-.
Saloon with lane change assist (version 1.0):
• Setting dimension (left-side) = 586 mm (read off from meas‐
uring scale -1-).
Saloon with lane change assist (version 1.5):
• Setting dimension (left-side) = 745 mm (read off from meas‐
uring scale -1-).
Avant with lane change assist (version 1.5):
• Setting dimension (left-side) = 745 mm (read off from meas‐
uring scale -1-).
allroad with lane change assist (version 1.5):
• Setting dimension (left-side) = 830 mm (read off from meas‐
uring scale -1-).

256 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

All vehicles (continued):

– Switch on calibration unit for lane change assist -VAS 6350/4-
with power switch -3-.
• The green LED -1- must light up.
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
– After completing calibration of lane change assist, end “Cali‐
bration”, switch off ignition and unplug diagnostic connector.

cardiagn.com

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

11. Lane change assist 257

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

12 Towing bracket

12.1 Socket for towing bracket

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 96 :
♦ Removing and installing socket for towing bracket
♦ Pin assignment at socket for towing bracket

12.2 Removing and

Protected by copyright. installing
Copying trailerpurposes,
for private or commercial detectorin part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
control
with respectunit -J345-of information in this document. Copyright by AUDI AG.
to the correctness

Removing
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:

cardiagn.com
Vehicle brand
Engine code
69 Trailer function J345
69 Control unit replacement (Repair Group 96)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
– Open luggage compartment side trim (right-side).
– Release retaining clip -arrow- and swivel trailer detector con‐
trol unit -J345- -item 1- out of frame.
– Unplug electrical connectors -2- and -3-.
Installing
Install in reverse order.

258 Rep. Gr.96 - Lights, bulbs, switches - interior

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

97 – Wiring
1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers, etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
Furthermore, rubber components or plastic components and ad‐
hesives are made of non-conductive material.
Always fit new components if you are not sure that the old com‐
ponents are suitable ⇒ Electronic parts catalogue .
Note:
♦ We recommend the use of genuine replacement parts only;
they have been tested and are compatible with aluminium.
♦ We recommend using Audi Genuine Accessories.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
♦ Damage resulting from contactpermitted
corrosion is not covered byAUDI AG does not guarantee or accept any liability

cardiagn.com
unless authorised by AUDI AG.
warranty. with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Contact corrosion 259

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2 Relay carriers, fuse carriers

Observe notes on contact corrosion ⇒ page 259 .

2.1 Overview of engine compartment electronics box, wiring junction, battery

fuse holder

1 - Engine compartment elec‐

tronics box
❑ Removing and installing
⇒ page 262
❑ Tightening torque
⇒ page 261
2 - Fuse holder B -SB-
❑ Relay and fuse carrier in
engine compartment
electronics box
❑ Removing and installing
⇒ page 264

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❑ With suppression filter -
C24- , removing and in‐
stalling ⇒ page 264
3 - Cover
❑ For electronics box (en‐
gine compartment)
❑ Tightening torque
⇒ page 261
4 - Wiring junction 2 for termi‐
nal 30 -TV22-
❑ Removing and installing
⇒ page 267
5 - Door separating connector
(front right)
❑ Unplugging
⇒ page 268
6 - Door separating connector
(rear right)
❑ Unplugging
⇒ page 268
7 - Fuse holder A -SA-
❑ In luggage compartment, at battery
❑ Removing and installing ⇒ page 268
8 - Battery
9 - Door separating connector (rear left)
❑ Unplugging ⇒ page 268
10 - Door separating connector (front left)
❑ Unplugging ⇒ page 268 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
11 - Engine control unit with respect to the correctness of information in this document. Copyright by AUDI AG.

260 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Engine compartment electronics box - tightening torque

1- Bolt, 3.5 Nm
2- Cover for engine compartment electronics box
3- Bolt, 4.5 Nm
4- Engine compartment electronics box

Fuse holder B -SB- in engine compartment electronics box - tight‐

cardiagn.com
ening torque
1- Positive wire - 9 Nm
2- Fuse holder B
3- Electrical wire on reverse side - 9 Nm

Wiring junction 2 for terminal 30 -TV22- - tightening torques

1- Fan wire, 7.5 Nm
2- Fan wire, 7.5 Nm
3- PTC wire, 18 Nm
4- Nut, 7.5 Nm Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

5- Positive wire (electronics box), 7.5with

Nm
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
respect to the correctness of information in this document. Copyright by AUDI AG.

6- Battery wire, 16 Nm
7- Jump start socket -U6- , 20 Nm
8- Bolt, 7.5 Nm
9- Starter wire, 18 Nm
10 - Nut, 7.5 Nm

2. Relay carriers, fuse carriers 261

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Fuse holder A -SA- - tightening torque

1- Electrical wire, 7.5 Nm
2- Nut, 9 Nm
3- Nut, 9 Nm
4- Fuse holder A in luggage compartment
5- Positive cable to engine, 7.5 Nm
6- Bolt, 3.5 Nm
7- Battery isolation igniter -N253- ⇒ Rep. Gr. 69
8- Electrical wire, 18 Nm

2.2 Removing and installing engine com‐

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partment electronics box
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove filler neck for washer fluid reservoir ⇒ page 88 .
– Remove wiper motor ⇒ page 84 .
– Remove bolts -arrows- and detach cover for engine compart‐
ment electronics box.

Note

Disregard -item 1-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Release catches -arrows A- and remove engine control unit
with respect to the correctness of information in this document. Copyright by AUDI AG.

-arrow B-.

262 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -2- if fitted.

– Unplug electrical connectors -4- and unfasten electrical wire
-3- at front and rear.
– Release catches -arrow- and detach fuse holder B -item 1-.
– Disengage engine wiring harness at electronics box and move
clear.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– If fitted, remove alarm horn -H12- ⇒ page 245 and move wiring

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harness clear.
– Remove bolts -arrows-.
– Unplug electrical connector -1- for brake fluid level warning
contact -F34-
– Lift engine compartment electronics box -3- and unplug elec‐
trical connector -2- for clutch position sender -G476- .

– Disengage engine wiring harness -1- at electronics box.

– Release retaining clips -2- and -5- and press retaining frame
-3- for engine control units as far as possible towards passen‐
ger compartment.
– Take out engine compartment electronics box -4-.
Installing
• Tightening torque ⇒ page 261
Installation is carried out in the reverse order; note the following:
– Install fuse holder B ⇒ page 264 .
– Install alarm horn -H12- ⇒ page 245 .
– Connect battery. Steps required ⇒ page 6 .
– Install wiper motor ⇒ page 84 .
– Install filler neck for washer fluid reservoir ⇒ page 88 .

2. Relay carriers, fuse carriers 263

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.3 Removing and installing suppression fil‐

ter -C24-
Removing
– Remove fuse holder B in engine compartment electronics box
⇒ page 264 .

Note

The electrical connectors do not need to be detached.

– Cut through cable tie -2-.

– Unplug electrical connector -1-.
– Detach suppression filter -C24- -item 3-.
Installing
Installation is carried out in the reverse order; note the following:

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Note

Refit all cable ties at the same locations when reinstalling.

– Install fuse holder B in engine compartment electronics box

⇒ page 264 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
2.4 Removing and installing fuse holder B -
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
SB- in engine compartment electronics
box
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove filler neck for washer fluid reservoir ⇒ page 88 .
– Remove bolts -arrows- and detach cover for engine compart‐
ment electronics box.

Note

Disregard -item 1-.

– Release catches -arrows A- and remove engine control unit

-arrow B-.

264 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unplug electrical connector -2- if fitted.

– Unplug electrical connectors -4- and unfasten electrical wire
-3-.
– Release catches -arrow- and detach fuse holder B -item 1-.
– Disengage engine wiring harness at electronics box and move
clear.

– Unfasten electrical wire -5-.

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– Pull relays -3- and control units -4- out of fuse holder B.
– Release retaining clip -arrow-, press out fuse carrier -2- to‐
wards rear and disengage.
– Release retaining clip and press out additional fuse holder
-1- towards rear.

– Release retaining clips -arrows- and press relay carrier -2- to‐
wards rear out of holder -1-.
– Take fuse holder B out of engine compartment electronics box.
Installing
• Tightening torque ⇒ page 261
Installation is carried out in the reverse order; note the following:
– Install filler neck for washer fluid reservoir ⇒ page 88 .
– Connect battery. Steps required ⇒ page 6 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Relay carriers, fuse carriers 265

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.5 Removing and installing fuse carrier in

engine compartment electronics box
Removing
– Remove fuse holder B ⇒ page 264 .
– Release retaining clip -arrow-, press out fuse carrier -2- to‐
wards rear and disengage.

Note

Disregard other -items-.

– If fitted, release captive fastener and pull it off fuse carrier.

– Remove fuses from fuse carrier.
– Release retaining clips -arrows- and remove cover from fuse
carrier.

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– Detach retaining strip -1- for connectors -arrow- and take con‐
nectors out of socket.

Note
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Exact assignment of contacts in fuse carrier in engine
permitted compart‐
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
ment electronics box can be found in applicable current
with respect flow
to the correctness of information in this document. Copyright by AUDI AG.
diagram ⇒ Current flow diagrams, Electrical fault finding and Fit‐
ting locations.

Installing
Installation is carried out in the reverse order; note the following:
– Install fuse holder B ⇒ page 264 .
– Connect battery. Steps required ⇒ page 6 .

266 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

2.6 Removing and installing terminal 30 wir‐

ing junction 2 -TV22-
Removing
Vehicles up to 05.2008:
– Unclip plenum chamber cover -2- and detach.

Note

Disregard -items 1, 3- and -arrow-.

Vehicles from 06.2008 onwards:

– Remove bolts -3-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Unclip retaining clips -2- from retainer and detach plenum
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

chamber cover -1-.

with respect to the correctness of information in this document. Copyright by AUDI AG.

cardiagn.com
All vehicles (continued):
– Release catch -arrow A- and open cover -arrow B-.

2. Relay carriers, fuse carriers 267

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Unbolt electrical wiring -1, 2, 3, 5, 6, 9-.

– Remove bolt -8- and detach terminal 30 wiring junction 2 -
TV22- from body brace.

Note

Disregard -items 4, 7 and 10-.

Installing
• Tightening torque ⇒ page 261
Install in reverse order.

2.7 Unplugging door separating connector

Procedure
– Release catch in direction of -arrow A- and detach door sep‐
arating connector -1- towards the outside -arrow B-.

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2.8 Removing and installing fuse holder A -
SA- in luggage compartment
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove mounting -1- for tool kit.
– If fitted, remove subwoofer -1- ⇒ Rep. Gr. 91 .

Note

If fuse holder A cannot be detached from battery terminal, un‐

screw bolt -4- on battery retainer plate -3- and pull battery -2- out
of battery retainer and slightly towards left -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

268 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Loosen nut -1- several turns and disconnect battery clamp of

positive cable together with fuse holder A from battery termi‐
nal.
– Release retaining clip -3- and open cover -2- of fuse holder A
-arrow-.

– Unscrew electrical wires -1, 5, 6, 8-.

– Detach battery clamp -4- of positive cable from battery termi‐
nal together with fuse holder A.
– Remove battery isolation igniter -N253- -item 7- ⇒ Rep. Gr.
69 .
– Take out fuse holder A. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

cardiagn.com
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Note

Exact assignment of contacts in fuse holder A can be found in

applicable current flow diagram ⇒ Current flow diagrams, Electri‐
cal fault finding and Fitting locations.

Installing
• Tightening torque ⇒ page 262
Installation is carried out in the reverse order; note the following:
– Install battery isolation igniter -N253- ⇒ Rep. Gr. 69 .
– Fit retainer plate ⇒ page 10 .
– Connect battery. Steps required ⇒ page 6 .

2. Relay carriers, fuse carriers 269

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3 Relay carriers, fuse carriers (vehicle

interior)

3.1 Overview of relay carrier/fuse carrier (dash panel), relay carrier/fuse carrier
(A-pillar)

1 - Onboard supply control unit

-J519-
❑ Removing and installing
⇒Protected
page by 275
copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
2 - Mounting for relay
with respect to the and fuseof information in this document. Copyright by AUDI AG.
correctness
carrier with onboard supply
control unit -J519-
❑ Removing and installing
⇒ page 277
3 - Nut

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❑ 2x
❑ 3 Nm
4 - 6-position connector point,
A-pillar, passenger's side
❑ Removing and installing
⇒ page 283
5 - Fuse holder D -SD-
❑ On right of dash panel
❑ Removing and installing
⇒ page 280
6 - Central tube (right-side)
7 - CAN isolating connector
(dash panel) -T46s-
❑ Removing and installing
⇒ page 281
8 - Central tube (left-side)
9 - Fuse holder C -SC-
❑ On left of dash panel
❑ Removing and installing
⇒ page 271
10 - CAN isolating connector
(interior) -T46i-
❑ Removing and installing ⇒ page 279
11 - 6-position connector point, A-pillar, driver's side
❑ On left of dash panel
❑ Removing and installing ⇒ page 278
12 - 3-position relay and fuse carrier
❑ Beneath dash panel (left-side)
❑ Removing and installing ⇒ page 273
13 - 4-position relay and fuse carrier and screw connection
❑ Beneath dash panel (left-side)
❑ Removing and installing ⇒ page 274

270 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4-position relay and fuse carrier and screw connection - tightening

torque
1- Electrical wire, 9 Nm
2- Electrical wire, 9 Nm
3- 4-position relay and fuse carrier

3.2 Removing and installing fuse holder C -

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SC- with fuse carrier in dash panel (left-
side)
Special tools and workshop equipment required
♦ Removal wedge -3409-

Removing
– Lever side cover -1- off dash panel with removal wedge -3409-
-arrow- and detach.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3. Relay carriers, fuse carriers (vehicle interior) 271

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Release retaining clips -1- in direction of -arrow- and press

fuse carriers -2 ... 4- out of fuse holder C towards rear.

– Release retaining clip -arrow A- and swivel out fuse holder C

-item 2- in direction of -arrow B- on central tube -1- for dash

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panel.
Installing
Install in reverse order.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3.3 Removing and installing fuse carrier in

dash panel (left-side)
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove fuse holder C in dash panel (left-side) ⇒ page 271 .

Note

If necessary, remove dash panel trim (top, driver's side) ⇒ Rep.

Gr. 68 .

272 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– If fitted, release captive fastener and pull it off fuse carrier.

– Remove fuses from fuse carrier.
– Release retaining clips -arrows- and remove cover from fuse
carrier.

– Pull off retaining strip -1- for connectors -arrow- and take con‐
nectors out of socket.

Note

Exact assignment of contacts in fuse carrier in dash panel (left-

side) can be found in applicable current flow diagram ⇒ Current
flow diagrams, Electrical fault finding and Fitting locations.

cardiagn.com
Installing
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Installation
with respect to theis carriedofout
correctness in thein reverse
information order;
this document. note
Copyright theAG.
by AUDI following:
– Install fuse holder C in dash panel (left-side) ⇒ page 271 .
– Connect battery. Steps required ⇒ page 6 .

3.4 Removing and installing 3-position relay

and fuse carrier
Removing
– Switch off ignition and take out ignition key.
– Remove driver's storage compartment ⇒ Rep. Gr. 68 .
– Press retaining springs in direction of -arrow-, disengage 3-
position relay and fuse carrier -1- and detach.
– Unclip fuse holders at relay and fuse carrier.

3. Relay carriers, fuse carriers (vehicle interior) 273

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Pull out relays and control units.

– Release retaining clips -arrows- and press out relay carrier
-2- towards rear out of holder -1-.

Note

Exact assignment of contacts in 3-position relay and fuse carrier

can be found in appropriate current flow diagram ⇒ Current flow
diagrams, Electrical fault finding and Fitting locations.

Installing
Installation is carried out in the reverse order; note the following:
– Install driver's storage compartment ⇒ Rep. Gr. 68 .

3.5 Removing and installing 4-position relay

and fuse carrier with screw connection
Removing

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– Switch off ignition and take out ignition key.
– Remove dash panel trim (driver's side) ⇒ Rep. Gr. 68 .
– Press retaining springs in direction of -arrow-, disengage 3-
position relay and fuse carrier -1- and detach.

– Before removing, mark electrical wiring -1- and -2- for re-in‐
stallation.
– Disconnect electrical wire -1- on 4-position relay and fuse car‐
rier.
– Release retaining spring -arrow A- and swivel relay and fuse
carrier -3- out of mounting -arrow B-.
– Disconnect electrical wire -2- on back of 4-position relay and
fuse carrier.
– Unclip
Protectedfuse holders
by copyright. at relay
Copying carrier.
for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

274 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Pull out relays and control units.

– Release retaining clips -arrows- and press relay carrier -2- to‐
wards rear out of holder -1-.

Note

Exact assignment of contacts in 4-position relay and fuse carrier

with screw connection can be found in appropriate current flow
diagram ⇒ Current flow diagrams, Electrical fault finding and Fit‐
ting locations.

Installing
• Tightening torque ⇒ page 271
Installation is carried out in the reverse order; note the following:
– Install driver's storage compartment ⇒ Rep. Gr. 68 .

3.6 Removing and installing onboard supply

control unit -J519-Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

cardiagn.com
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Removing
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:
Vehicle brand
Engine code
09 Electronic central electrics J519
09 Control unit replacement (Repair Group 97)
– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
– Switch off ignition and take out ignition key.
– Remove dash panel trim (driver's side) ⇒ Rep. Gr. 68 .
– Press retaining springs in direction of -arrow-, disengage 3-
position relay and fuse carrier -1- and detach.

3. Relay carriers, fuse carriers (vehicle interior) 275

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– Disconnect electrical wire -1- on 4-position relay and fuse car‐

rier.
– Release retaining spring -arrow A- and swivel relay and fuse
carrier -3- out of mounting -arrow B-.

Note

Disregard -item 2-.

– Release retaining spring -arrow- and take out onboard supply

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control unit -J519- -item 1- downwards out of mounting.
– Unplug electrical connectors -2, 5, 6, 7, 8-.
– Unplug electrical connectors -3- and -4-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector by pressing catch -1- and moving

retaining clip in direction of -arrow-; then detach connector.
Installing
Installation is carried out in the reverse order; note the following:
• Tightening torque ⇒ page 271
– Install dash panel trim (driver's side) ⇒ Rep. Gr. 68 .

276 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.7 Removing and installing mounting for

relay and fuse carrier with onboard sup‐
ply control unit -J519-
Removing
– Remove side air vent in dash panel (left-side) ⇒ Rep. Gr. 70 .
– Remove bolt -arrow- at air duct -1-.

Note

The air duct does not have to be removed.

– Remove onboard supply control unit -J519- ⇒ page 275 .

– Slide through extension with socket between air duct -3- and
central tube -4- and remove nut -2-.

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– Guide extension with socket around side of mounting -6- (as
shown in illustration) to remove nut -5-.
– Pull mounting off studs.
– Push mounting towards inside of vehicle to disengage retain‐
ing pin -1- on mounting at side guide in A-pillar -arrow-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Installing
Installation is carried out in the reverse order; note the following:
• Tightening torque ⇒ page 270
– Engage retaining pin -1- on mounting -3- at side guide in A-
pillar -arrow-.
– Tighten nut -2-.
– Install air duct to dash panel vent (left-side) ⇒ Rep. Gr. 87 .
– Install side air vent in dash panel (left-side) ⇒ Rep. Gr. 70 .

3. Relay carriers, fuse carriers (vehicle interior) 277

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.8 Removing and installing 6-position con‐

nector point, A-pillar, driver's side
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove A-pillar trim (bottom left) ⇒ Rep. Gr. 70 .
– Press retaining clip in direction of -arrow- and detach connec‐
tor point -3- from A-pillar.
– Unclip fuse holder at connector point.
– Unplug electrical connector -1- for airbag ⇒ Rep. Gr. 69 .
– Remove mounting -2- for CAN isolating connector (interior) -
T46i- ⇒ page 279 .

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Pull out relays and control units.
– Release retaining clips -arrows- and press relay carrier -2- to‐
wards rear out of holder -1-.

Note

The exact contact assignment for the 6-position connector point

in the A-pillar (driver's side) can be found in the applicable current
flow diagram ⇒ Current flow diagrams, Electrical fault finding and
Fitting locations.

Installing
Installation is carried out in the reverse order; note the following:
– Install mounting for CAN isolating connector (interior) -T46i-
⇒ page 279 .
– Plug in electrical connector for airbag ⇒ Rep. Gr. 69 .
– Install A-pillar trim (bottom left) ⇒ Rep. Gr. 70 .
– Connect battery. Steps required ⇒ page 6 .

278 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.9 Removing and installing CAN isolating

connector (interior) -T46i-
Removing
– Switch off ignition and take out ignition key.
– Remove A-pillar trim (bottom left) ⇒ Rep. Gr. 70 .
– Press in retaining tabs -1- and release retaining clip -arrow-.
– Remove CAN isolating connector (interior) -T46i- -item 2-.

Note

Exact contact assignment of CAN isolating connector (interior)

can be found in appropriate current flow diagram ⇒ Current flow
diagrams, Electrical fault finding and Fitting locations.

Installing
Installation is carried out in the reverse order; note the following:

cardiagn.com
– Install A-pillar trim (bottom left) ⇒ Rep. Gr. 70 .

3.10 Removing and installing mounting for

CAN isolating connector (interior) -T46i-
Removing
– Disengage A-pillar connector point (left-side) ⇒ page 278 .
– Remove CAN isolating connector (interior) -T46i-
⇒ page 279 .
– Move locking lever -2- to “open” position -arrow-.
– Press release tab -1- and press out mounting -3- for CAN iso‐
lating connector (interior) -T46i- towards rear.

Installing
Installation is carried out in the reverse order; note the following:
– Move locking lever -1- on mounting to “closed” position.
• The two markings -arrows- must face each other.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Install
permitted CAN isolating
unless authorised by AUDI AG. connector
AUDI AG does not(interior)
guarantee-T46i-
or accept⇒anypage
liability 279 .
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install A-pillar connector point (left-side) ⇒ page 278 .

3. Relay carriers, fuse carriers (vehicle interior) 279

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.11 Removing and installing fuse holder D -

SD- with fuse carrier in dash panel
(right-side)
Removing
– Switch off ignition and take out ignition key.
– Remove glove box ⇒ Rep. Gr. 68 .
– Remove mounting for CAN isolating connector (interior) -T46i-
-item 4- ⇒ page 282 .
– Release retaining clips -1- in direction of -arrow- and press
fuse carriers -2- and -3- out of fuse holder D towards rear.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Release retaining clip -arrow A- and swivel
permitted out
unlessfuse holder
authorised D AG. AUDI AG does not guarantee or accept any liability
by AUDI
-item 2- in direction of -arrow B- on central tubeto-1-
with respect for dashof information in this document. Copyright by AUDI AG.
the correctness
panel.
Installing
Installation is carried out in the reverse order; note the following:
– Install mounting for CAN isolating connector (interior) -T46i-
⇒ page 282 .
– Install glove box ⇒ Rep. Gr. 68 .

280 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

3.12 Removing and installing fuse carrier in

dash panel (right-side)
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove glove box ⇒ Rep. Gr. 68 .
– Release retaining clips -1- in direction of -arrow- and press
fuse carriers -2- and -3- out of fuse holder D towards rear.

Note

Disregard -item 4-.

cardiagn.com
– If fitted, release captive fastener and pull it off fuse carrier.
– Remove fuses from fuse carrier.
– Release retaining clips -arrows- and remove cover from fuse
carrier.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Pull off retaining strip -1- for connectors -arrow- and take con‐
nectors out of socket.

Note

Exact contact assignment of fuse carrier in dash panel (right-side)

can be found in applicable current flow diagram ⇒ Current flow
diagrams, Electrical fault finding and Fitting locations.

Installing
Installation is carried out in the reverse order; note the following:
– Install glove box ⇒ Rep. Gr. 68 .
– Connect battery. Steps required ⇒ page 6 .

3.13 Removing and installing CAN isolating

connector (dash panel) -T46s-
Special tools and workshop equipment required

3. Relay carriers, fuse carriers (vehicle interior) 281

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

♦ Removal wedge -3409-

Removing
– Switch off ignition and take out ignition key.
– Lever side cover off dash panel with removal wedge -3409-
-arrow- and detach.

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Press in retaining tabs -1- and release retaining clip -arrow-.
– Remove CAN isolating connector (dash panel) -T46s-
-item 2-.

Note

Exact contact assignment of CAN isolating connector (interior)

can be found in appropriate current flow diagram ⇒ Current flow
diagrams, Electrical fault finding and Fitting locations.

Installing
Install in reverse order.

3.14 Removing and installing mounting for

CAN isolating connector (dash panel) -
T46s-
Removing
– Remove glove box ⇒ Rep. Gr. 68 .
– Remove CAN isolating connector (dash panel) -T46s-
⇒ page 281 .
– Move locking lever -2- to “open” position -arrow-.
– Press release tab -1- and press out mounting -3- for CAN iso‐
lating connector (dash panel) -T46s- towards rear.

282 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Installing
Installation is carried out in the reverse order; note the following:
– Move locking lever -1- on mounting to “closed” position.
• The two markings -arrows- must face each other.
– Install CAN isolating connector (dash panel) -T46s-
⇒ page 281 .
– Install glove box ⇒ Rep. Gr. 68 .

3.15 Removing and installing 6-position con‐

nector point, A-pillar, passenger's side
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove A-pillar trim (bottom right) ⇒ Rep. Gr. 70 .

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– Press retaining clip in direction of -arrow- and detach connec‐
tor point -1- from A-pillar.
– Unclip fuse holder -2- at connector point.
– If fitted, unplug electrical connector -2- for airbag ⇒ Rep. Gr.
69 .

– Pull out relays and control units.

– Release retaining clips -arrows- and press out relay carrier
-2- towards rear out of holder -1-.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

The exact contact assignment for the 6-position connector point

in the A-pillar (passenger's side) can be found in the applicable
current flow diagram ⇒ Current flow diagrams, Electrical fault
finding and Fitting locations.

Installing
Installation is carried out in the reverse order; note the following:
– Plug in electrical connector for airbag ⇒ Rep. Gr. 69 .
– Install A-pillar trim (bottom right) ⇒ Rep. Gr. 70 .
– Connect battery. Steps required ⇒ page 6 .

3. Relay carriers, fuse carriers (vehicle interior) 283

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4 Relay carriers, fuse carriers (luggage

compartment)

4.1 Overview of relay and fuse carrier (luggage compartment), control units

1 - Fuse holder F -SF-

❑ Removing and installing
⇒ page 287
❑ Tightening torque
⇒ page 285
2 - Parking aid control unit -
J446-
❑ Exploded view
⇒ page 187
3 - Mounting frame
❑ For control units

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
❑ For vehicles without permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
towing bracket with respect to the correctness of information in this document. Copyright by AUDI AG.

❑ For vehicles without

auxiliary heater
4 - Trailer detector control unit
-J345-
❑ Removing and installing
⇒ page 258
5 - Remote control receiver for
auxiliary heater -R64-
❑ Removing and installing
⇒ Rep. Gr. 82
6 - Mounting frame
❑ For control units
❑ For vehicles with towing
bracket
❑ For vehicles with auxili‐
ary heater
7 - Control unit for electrome‐
chanical parking brake -J540-
❑ Removing and installing
⇒ Rep. Gr. 46
8 - Mounting frame
❑ For control units
9 - Convenience system central control unit -J393-
❑ Removing and installing ⇒ page 286
10 - Special vehicle control unit -J608-
❑ In luggage compartment (right-side)
❑ Removing and installing ⇒ page 288
11 - Interface control unit for vehicle location system -J843-
❑ Removing and installing ⇒ Rep. Gr. 57
12 - Reversing camera system control unit -J772-
❑ Removing and installing ⇒ Rep. Gr. 91

284 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

13 - Mounting frame
❑ For control units
14 - Electronically controlled damping control unit -J250-
❑ Removing and installing ⇒ Rep. Gr. 40

Fuse holder F -SF- - tightening torque

1 - Fuse holder F -SF-
2 - Fuse carrier
4 - Nut, 3 Nm
5 - Relay/control unit

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Tightening torque for mounting frame for convenience system
central control unit -J393-
– Tighten nuts -arrows- to 3 Nm.
1 - Mounting frame

Tightening torque for mounting frame for special vehicle control

unit -J608-
– Tighten bolts -1- and -2- to 3 Nm.
– Tighten nut -4- to 3 Nm.
3 - Mounting frame
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Relay carriers, fuse carriers (luggage compartment) 285

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4.2 Removing and installing convenience

system central control unit -J393-
Removing
– When renewing control unit select “Replacement” function for
appropriate control unit in “Guided Fault Finding” or “Guided
Functions” ⇒ Vehicle diagnosis, testing and information sys‐
tem VAS 5051.
– Select function or path:
Vehicle brand
Engine code Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
46 Convenience system central control unit,
with respect functions
to the correctness of information in this document. Copyright by AUDI AG.

46 Control unit replacement (Repair Group 57)

– Continue to follow the instructions on the display of the vehicle
diagnostic tester.
– Open luggage compartment side trim (right-side).
– Release retaining clips -arrows- and remove convenience sys‐

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tem central control unit -J393- -item 7- from mounting frame.
– Carefully unplug electrical connectors -4- and -6- and aerial
connector -3-.
– Unplug electrical connectors -1, 2, 5-.

– Unplug electrical connector by releasing catch -1- and moving

retaining clip in direction of -arrow-.
– Detach convenience system central control unit -J393- .
Installing
Install in reverse order.

286 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

4.3 Removing and installing fuse holder F -

SF- in luggage compartment (right-side)
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Open cover in luggage compartment side trim (right-side).
– Release retaining clips -3- in direction of -arrow- and press
fuse carriers -2- out of fuse holder F towards rear.
– Remove nut -4-.
– Guide fuse holder F -item 1- out of body.
– Unclip fuse holders at relay carrier.
– Pull out relay -5- and control units.

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– Release retaining clips -arrows- and press relay carrier -2- to‐
wards rear out of holder -1-.
– If fitted, cut through cable ties and remove fuse holder F.

Note

Exact contact assignment of fuse holder F in luggage compart‐

ment (right-side) can be found in applicable current flow diagram
⇒ Current flow diagrams, Electrical fault finding and Fitting loca‐
tions.

Installing
• Tightening torque ⇒ page 285
Installation is carried out in the reverse order; note the following:
– Fit fuse holder F -item 1-, making sure guides -2- are inserted
properly in mountings -arrows-.
– Connect battery. Steps required ⇒ page 6 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
4.4 Removing and installing fuse carrier in
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
luggage compartment (right-side)
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Remove fuse holder F in luggage compartment (right-side)
⇒ page 287 .

4. Relay carriers, fuse carriers (luggage compartment) 287

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

Note

Relay and fuse holders remain attached.

– If fitted, release captive fastener and pull it off fuse carrier.

– Remove fuses from fuse carrier.
– Release retaining clips -arrows- and remove cover from fuse
carrier.

– Detach retaining strip -1- for connectors -arrow- and take con‐
nectors out of socket.

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Note

Exact contact assignment of fuse carrier in luggage compartment

(right-side) can be found in applicable current flow diagram ⇒ Cur‐
rent flow diagrams, Electrical fault finding and Fitting locations.

Installing
Installation is carried out in the reverse order; note the following:
– Install fuse holder F ⇒ page 287 .
– Connect battery. Steps required ⇒ page 6 .

4.5 Removing and installing special vehicle

control unit -J608-
Removing
– With ignition switched off, disconnect earth cable at battery
⇒ page 5 .
– Open cover in luggage compartment side trim (right-side).
– Remove nuts -arrows- and place mounting frame -1-Protected
with con‐
by copyright. Copying for private or commercial purposes, in part or in whole, is not
venience system central control unit -J393- to one side.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

288 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

– If fitted, release retaining clips -arrows- and remove electron‐

ically controlled damping control unit -J250- -item 1- from
mounting frame.

– Remove bolts -1- and -2- and nut -4-.

– Swivel mounting frame -3- with control units to side.
– Unplug electrical connectors at control units in mounting
frame.
– Remove mounting frame with control units.

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Press retaining clip -1- in direction of -arrow A- and swivel

special vehicle control unit -J608- -item 2- in direction of
-arrow B- out of mounting frame -3-.
Installing
• Tightening torque ⇒ page 285 and ⇒ page 285
Installation is carried out in the reverse order; note the following:
– Connect battery. Steps required ⇒ page 6 .

4. Relay carriers, fuse carriers (luggage compartment) 289

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

5 Repairing wiring harnesses and elec‐

trical connectors
The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 97 :
♦ General information on repairs to the vehicle electrical system
♦ Notes on repairing wiring harnesses and electrical connectors
♦ Repairing wiring for pyrotechnic components
♦ Repairing CAN bus wiring
♦ Repairing an 0.25 mm2 wire with a single crimp connector
♦ Repairing a wire of 0.35 mm2 section or thicker with a single
crimp connector
♦ Repairing an 0.25 mm2 wire by connecting in an additional
wire
♦ Repairing a wire of 0.35 mm2 section or thicker by connecting
in an additional wire

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

290 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

6 Repairing connector housings and

electrical connectors
The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 97 :
♦ Notes on repairing connector housings and electrical connec‐
tors
♦ Repairing contacts in connector housings
♦ Fitting seals for individual wires
♦ Repairing connector housings with insulation displacement
technology (IDC)

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

6. Repairing connector housings and electrical connectors 291

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

7 Releasing and dismantling connector

housings
The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 97 :
♦ Notes on releasing and dismantling connector housings
♦ Secondary locking device
♦ Primary locking device
♦ Primary locking device with round connector systems
♦ Primary locking device with flat connector systems
♦ Primary locking device with special connector systems

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

292 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

8 Cleaning contact surfaces with con‐

tact surface cleaning set -VAS 6410-
The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 97 :
♦ Servicing wiring lugs
♦ Servicing screw connections
♦ Cleaning battery clamps and battery terminals
♦ Corrosion protection

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

8. Cleaning contact surfaces with contact surface cleaning set VAS 6410 293
 Audi A4 2008 ➤
Electrical system - Edition 12.2009

9 Repairing aerial wires

⇒ Electrical system; General information; Rep. Gr. 97

cardiagn.com
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

294 Rep. Gr.97 - Wiring

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

10 Fibre optic cables

The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 97 :
♦ Repairing fibre optic cables
♦ Separating fibre optic cable from wiring harness connector

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG. cardiagn.com

10. Fibre optic cables 295

 Audi A4 2008 ➤
Electrical system - Edition 12.2009

11 Vehicle diagnostic, testing and infor‐

mation systems
The following descriptions are given in ⇒ Electrical system; Gen‐
eral information; Rep. Gr. 97 :
♦ Notes on operation and safety
♦ Connecting vehicle diagnostic, testing and information system
-VAS 5051B-

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Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

296 Rep. Gr.97 - Wiring