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Audi A3 Current Flow Diagram No. 1 / 1

Edition 07.2006

Basic equipment
from model year 2001
Notes:
For information concerning

Position of relays and fuses

Multi-pin connections

Control units and relays

Earth connections

→ List of Fitting Locations!

For information concerning

Fault Finding Programs

→ guided fault finding

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Audi A3 Current Flow Diagram No. 1 / 2

Earth points, earth connections
- Earth point, in plenum chamber
10

- Earth point, in battery box

11

- Earth point 1, next to relay plate

30

- Earth point, next to steering column

42

- Earth point, lower part of right A-pillar

43

- Earth connection 1, in engine compartment wiring

85
harness
- Earth connection, in blower motor wiring harness
162

- Earth connection 3, in interior wiring harness

277

- Earth connection, in communications wiring

280
harness
- Earth connection 7, in interior wiring harness
285
ws = white
sw = black - Earth connection (HRC), in dash panel wiring
288
ro = red harness
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 3

Earth connections, battery, main fuse box, alternator
A - Battery
B - Starter
C - Alternator
C1 - Voltage regulator
J17 - Fuel pump relay
S131 - Fuse 1
S132 - Fuse 2
S133 - Fuse 3
S134 - Fuse 4
S138 - Fuse 5
S162 - Fuse 1 (30) in fuse holder on battery
S163 - Fuse 2 (30) in fuse holder on battery
S164 - Fuse 3 (30) in fuse holder on battery
T2f - 2-pin connector, alternator, in left engine
compartment
T3e - 3-pin connector, black, on main fuse box
- Earth strap, gearbox - body
2

- Earth point, on left in engine compartment

12

- Earth point, centre behind dash panel

45
ws = white
sw = black - Earth point, on left in luggage compartment
ro = red 50
br = brown
gn = green - Earth connection, in rear lid wiring harness
bl = blue 98
gr = grey
li = purple - Earth connection 1, in interior wiring harness
ge = yellow 238
or = orange
rs = pink - Earth connection 1, in radio wiring harness
255
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Audi A3 Current Flow Diagram No. 1 / 4

Ignition/starter switch, X-contact relief relay, starter
inhibitor and reversing light relay
D - Ignition/starter switch
J17 - Fuel pump relay
J59 - X-contact relief relay
J226 - Starter inhibitor and reversing light relay
T6m - 6-pin connector, brown, in plenum chamber
T10x - 10-pin connector, orange, in plenum chamber
T14 - 14-pin connector, in left engine compartment
- Earth point, in plenum chamber
10

- Earth connection 1, in engine harness

281

- Positive connection (15), in dash panel wiring

A2
harness
- Connection 1, in dash panel wiring harness
A49

- Connection (50a), in dash panel wiring harness

A86

- Positive connection (X), in interior wiring harness

B138

ws = white
- Positive connection (30a), in interior wiring harness
B156
sw = black
ro = red * - for manual gearbox only
br = brown
gn = green ** - for automatic gearbox only
bl = blue *** - for petrol engines with manual gearbox only
gr = grey **** - for petrol engines with automatic gearbox only
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 5

Light switch, left steering column switch
E1 - Light switch
E2 - Turn signal switch
E4 - Headlight dipper/flasher switch
E18 - Rear fog light switch
E19 - Parking light switch
L9 - Light switch illumination bulb
L40 - Front and rear fog light switch illumination bulb
- Earth connection 2, in interior wiring harness
249

- Earth connection 3, in interior wiring harness

277

- Positive connection (58), in dash panel wiring

A3
harness
- Connection (RFL), in dash panel wiring harness
A88

ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 6

Illumination regulators - switches and instruments,
windscreen washer/wiper system, headlight range
control (not for headlight for gaseous discharge light)
E20 - Switches and instruments illumination regulator
E102 - Headlight range control regulator
J31 - Automatic intermittent wash and wipe relay
L54 - Headlight range control regulator illumination bulb
V - Windscreen wiper motor
V48 - Left headlight range control motor
V49 - Right headlight range control motor
- Earth connection 2, in interior wiring harness
249

- Earth connection (sender earth) 1, in dash panel

269
wiring harness
- Earth connection, in communications wiring
280
harness
- Earth connection (HRC), in dash panel wiring
288
harness
- Connection (speed signal), in dash panel wiring
A27
harness
- Connection 2 (56), in dash panel wiring harness
A103
ws = white
sw = black - Connection (headlight range control), in dash panel
A114
ro = red wiring harness
br = brown
gn = green * - not for 1.8 l - Turbo-Motronic 154 kW, 4 cylinder
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 7

Right steering column switch, windscreen washer/wiper
system, rear wiper
E22 - Intermittent wiper switch
E34 - Rear wiper switch
E38 - Intermittent wiper regulator
J30 - Rear window wiper and washer relay
J31 - Automatic intermittent wash and wipe relay
T6d - 6-pin connector, brown, behind steering column
switch trim
T8g - 8-pin connector, brown, on left in luggage
compartment
V5 - Washer pump
V12 - Rear window wiper motor
- Earth connection, in rear lid wiring harness
98

- Earth connection 3, in interior wiring harness

277

- Connection (53), in dash panel wiring harness

A97

- Connection (windscreen wiper), in dash panel

A102
wiring harness

ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 8

Left tail light, left tail light, rear left turn signal, left brake
light, left fog light bulb
F - Brake light switch
F4 - Reversing light switch
J508 - Brake light suppression relay
L46 - Rear left fog light bulb
M4 - Left tail light bulb
M6 - Rear left turn signal bulb
M9 - Left brake light bulb
M16 - Left reversing light bulb
T5h - 5-pin connector, brown, A-pillar left, near relay
plate
T10x - 10-pin connector, orange, in plenum chamber
- Earth connection 1, in interior wiring harness
238

- Connection (RL), in dash panel wiring harness

A87

- Connection (54), in interior wiring harness

B131

- Connection 2 (54), in interior wiring harness

B185

* - for models with anti-lock brake system (ABS) MK20

ws = white ** - for models with anti-lock brake system (ABS) MK60
sw = black only
ro = red
br = brown *** - for manual gearbox only
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 9

Right tail light, rear right turn signal, right brake light,
right reversing light, high level brake light
J124 - Rear bulb monitoring device
M2 - Right tail light bulb
M8 - Rear right turn signal bulb
M10 - Right brake light bulb
M17 - Right reversing light bulb
M25 - High level brake light bulb
T5h - 5-pin connector, brown, A-pillar left, near relay
plate
T8g - 8-pin connector, brown, on left in luggage
compartment
- Earth connection, in rear lid wiring harness
98

- Earth connection 1, in interior wiring harness

238

- Connection (54), in interior wiring harness

B131

* - for models with rear bulb monitoring device

ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 10

Signal horn, cigarette lighter, ashtray illumination bulb,
dash panel vent illumination bulb, left and right washer
jet heater element
H - Horn plate
H2 - Treble tone horn
H7 - Bass tone horn
J4 - Dual tone horn relay
L15 - Ashtray illumination bulb
L67 - Dash panel left vent illumination bulb
L68 - Dash panel central vent illumination bulb
L69 - Dash panel right vent illumination bulb
T2 - 2-pin connector, heated washer jet, on right in
plenum chamber
T2h - 2-pin connector, heated washer jet, on right in
plenum chamber
T5a - 5-pin connector, yellow, interior, on steering
column
U1 - Cigarette lighter
Z20 - Left washer jet heater element
Z21 - Right washer jet heater element
- Earth connection 3, in interior wiring harness
277

- Earth connection, in communications wiring

ws = white 280
harness
sw = black
ro = red - Connection (71), in dash panel wiring harness
br = brown A72
gn = green
bl = blue - Connection 2 (X), in dash panel wiring harness
gr = grey A81
li = purple
ge = yellow - Positive connection (58b), in interior wiring harness
B145
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 11

Fuses
E87 - Operating and display unit for air conditioning
system/Climatronic
E150 - Driver side interior locking switch
S1 - Fuse in relay plate fuse holder
S2 - Fuse in relay plate fuse holder
S3 - Fuse in relay plate fuse holder
S4 - Fuse in relay plate fuse holder
S5 - Fuse in relay plate fuse holder
S6 - Fuse in relay plate fuse holder
S7 - Fuse in relay plate fuse holder
S224 - Fuse in fuse holder
S225 - Fuse in fuse holder
S226 - Fuse in fuse holder
S227 - Fuse in fuse holder
S231 - Fuse in fuse holder
T2a - 2-pin connector, black, behind the dash panel, side
right
T2c - 2-pin connector, black, on right in rear lid
T2d - 2-pin connector, black, on left in rear lid
T6a - 6-pin connector, black, on left in luggage
compartment
W6 - Glove compartment light
ws = white X - Number plate light
sw = black
ro = red - Connection (58a, right), in interior wiring harness
B117
br = brown
gn = green
bl = blue * - with air conditioning system
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 12

Fuses, headlight
L1 - Left headlight twin filament bulb
L2 - Right headlight twin filament bulb
M1 - Left side light bulb
M3 - Right side light bulb
S11 - Fuse in relay plate fuse holder
S18 - Fuse in relay plate fuse holder
S19 - Fuse in relay plate fuse holder
S20 - Fuse in relay plate fuse holder
S21 - Fuse in relay plate fuse holder
S22 - Fuse in relay plate fuse holder
S223 - Fuse in fuse holder
S236 - Fuse in fuse holder
T4j - 4-pin connector, left headlight
T4l - 4-pin connector, right headlight
- Earth connection, in communications wiring
280
harness
- Connection (30al), in dash panel wiring harness
A23

- Connection (56), in dash panel wiring harness

A51

- Positive connection 2 (56a), in interior wiring

B142
ws = white harness
sw = black
ro = red - Positive connection (58R), in interior wiring harness
B143
br = brown
gn = green
bl = blue - Positive connection (58L), in interior wiring harness
B144
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 13

Fuses, diagnostic connector, preparation for radio
E150 - Driver side interior locking switch
S12 - Fuse in relay plate fuse holder
S13 - Fuse in relay plate fuse holder
S14 - Fuse in relay plate fuse holder
S15 - Fuse in relay plate fuse holder
S237 - Fuse in fuse holder
S238 - Fuse in fuse holder
S239 - Fuse in fuse holder
S240 - Fuse in fuse holder
S241 - Fuse in fuse holder
S242 - Fuse in fuse holder
T8 - 8-connector, on radio
T16 - 16-pin connector, black, shelf centre console
(diagnostic connector)
- Earth connection 2, in interior wiring harness
249

- Earth connection 1, in radio wiring harness

255

- Positive connection (30a), in dash panel wiring

A1
harness
- Connection (86s), in dash panel wiring harness
A21
ws = white
sw = black
ro = red - Positive connection (30 - from radio), in dash panel
A46
br = brown wiring harness
gn = green
bl = blue
- Positive connection (30as), in dash panel wiring
A50
gr = grey harness
li = purple
ge = yellow
- Positive connection (30, central electrics), in interior
B115
or = orange wiring harness
rs = pink - Positive connection 2 (30a), in interior wiring
B150
harness
* - see applicable Current Flow Diagram for radio
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Audi A3 Current Flow Diagram No. 1 / 14

Turn signal system and hazard warning lights system
E3 - Hazard warning light switch
J2 - Hazard warning light relay
J234 - Airbag control unit
M5 - Front left turn signal bulb
M7 - Front right turn signal bulb
M18 - Left side mounted turn signal bulb
M19 - Right side mounted turn signal bulb
T10 - 10-pin connector, white, in plenum chamber
T16 - 16-pin connector, black, shelf centre console
(diagnostic connector)
- Earth connection 3, in interior wiring harness
277

- Earth connection, in communications wiring

280
harness
- Connection (crash signal), in dash panel wiring
A125
harness
- Positive connection 2 (15a), in interior wiring
B149
harness
- Connection (BL), in interior wiring harness
B152

- Connection (RTS), in interior wiring harness

ws = white B153
sw = black
ro = red * - for manual gearbox only
br = brown
gn = green
** - for automatic gearbox only
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 15

Right footwell light, door contact switch, central locking
motor
F2 - Driver door contact switch
F3 - Front passenger door contact switch
F10 - Rear left door contact switch
F11 - Rear right door contact switch
T5i - 5-pin connector, black, A-pillar left, near relay plate
T10d - 10-pin connector, brown, connector carrier on left
of A-pillar
T10f - 10-pin connector, brown, connector carrier on right
of A-pillar
V94 - Central locking motor with control unit for interior
lights switch-off delay and anti-theft alarm system
W9 - Left footwell light
W10 - Right footwell light
W18 - Luggage compartment light on left
W35 - Right luggage compartment light
- Earth connection, in rear lid wiring harness
98

- Earth connection, in driver door wiring harness

205

- Earth connection, in door wiring harness, front

206
passenger side
ws = white
sw = black - Connection 2 (DCt), in interior wiring harness
ro = red B155
br = brown
gn = green - Connection (central locking), in interior wiring
bl = blue B175
harness
gr = grey
li = purple * - for 4-door models only
ge = yellow
or = orange
rs = pink
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Audi A3 Current Flow Diagram No. 1 / 16

Combi-processor in dash panel insert, handbrake
warning switch, warning lamps, oil level and oil
temperature sender, oil pressure switch
F1 - Oil pressure switch
F9 - Handbrake warning switch
G266 - Oil level and oil temperature sender
J218 - Combi-processor in dash panel insert
J... - Engine control units
J104 - ABS control unit
K1 - Main beam warning lamp
K2 - Alternator warning lamp
K14 - Handbrake warning lamp
K18 - Trailer operation warning lamp
K65 - Left turn signal warning lamp
K86 - Traction control system warning lamp
K94 - Right turn signal warning lamp
K132 - Electric power control fault lamp
K134 - Adaptive suspension warning lamp
K149 - Engine electronics warning lamp
T10 - 10-pin connector, white, in plenum chamber
T14 - 14-pin connector, in left engine compartment
T32 - 32-pin connector, blue, on dash panel insert
T32a - 32-pin connector, green, on dash panel insert
ws = white - Earth connection 3, in interior wiring harness
sw = black 277
ro = red
br = brown - Earth connection 1, in engine harness
gn = green 281
bl = blue
gr = grey - Connection (brake system monitoring), in dash
li = purple A24
ge = yellow panel wiring harness
or = orange - Connection 1 (X), in dash panel wiring harness
rs = pink A80

- Connection (TCS/ESP), in dash panel wiring

A132
harness
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Audi A3 Current Flow Diagram No. 1 / 17

Combi-processor in dash panel insert, ABS control unit
with EDL, operating and display unit for air conditioning
system, fuel gauge, coolant temperature gauge
E87 - Operating and display unit for air conditioning
system/Climatronic
G1 - Fuel gauge
G3 - Coolant temperature gauge
G5 - Rev. counter
G14 - Voltmeter
G17 - Ambient temperature sensor
G21 - Speedometer
H3 - Buzzer and gong
J104 - ABS control unit
J218 - Combi-processor in dash panel insert
J234 - Airbag control unit
T32 - 32-pin connector, blue, on dash panel insert
T32a - 32-pin connector, green, on dash panel insert
Y - Analogue clock
- Earth connection (sender earth) 1, in dash panel
269
wiring harness
- Connection (diagnosis wire K), in dash panel wiring
A76
harness
ws = white - Connection (high bus), in dash panel wiring
A121
sw = black harness
ro = red
br = brown
- Connection (low bus), in dash panel wiring harness
A122
gn = green
bl = blue
gr = grey
- Connection (58d), in interior wiring harness
B116
li = purple
ge = yellow * - for air conditioner
or = orange
rs = pink ** - not for conditioner
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Audi A3 Current Flow Diagram No. 1 / 18

Immobilizer reader coil, warning lamps, belt switch,
coolant shortage indicator switch, brake pad wear
sender
D2 - Immobilizer reader coil
E24 - Driver side belt switch
F34 - Brake fluid level warning contact
F66 - Coolant shortage indicator switch
G34 - Front left brake pad wear sender
J218 - Combi-processor in dash panel insert
K3 - Oil pressure warning lamp
K4 - Side light warning lamp
K16 - Reserve fuel warning lamp
K19 - Seat belt warning system warning lamp
K28 - Coolant temperature and coolant shortage warning
lamp
K32 - Brake pad warning lamp
K37 - Washer fluid level warning lamp
K47 - ABS warning lamp
K75 - Airbag warning lamp
K102 - Rear lid closed warning lamp
K117 - Immobilizer warning lamp
K149 - Engine electronics warning lamp
T32 - 32-pin connector, blue, on dash panel insert
ws = white T32a - 32-pin connector, green, on dash panel insert
sw = black
ro = red - Earth connection 2, in interior wiring harness
249
br = brown
gn = green
bl = blue - Earth connection (sender earth) 1, in dash panel
269
gr = grey wiring harness
li = purple
ge = yellow - Earth connection 3, in interior wiring harness
277
or = orange
rs = pink
- Earth connection, in communications wiring
280
harness
* - only with seat belt warning
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Audi A3 Current Flow Diagram No. 1 / 19

Fresh air blower without air conditioning system, heated
rear window
E9 - Fresh air blower switch
E15 - Heated rear window switch
E159 - Fresh air/air recirculation flap switch
J9 - Heated rear window relay
N206 - Warm air blower series resistor with overheating
valve
T6a - 6-pin connector, black, on left in luggage
compartment
V2 - Fresh air blower
V154 - Fresh air/recirculated air flap control motor
Z1 - Heated rear window
- Earth connection, in rear lid wiring harness
98

- Earth connection, in blower motor wiring harness

162

- Connection (windscreen heater), in dash panel

A82
wiring harness
- Connection 1 (15a), in interior wiring harness
B135

- Connection, in heater blower wiring harness

L66
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink