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A4 - Od 2001 - Hak

This document contains current flow diagrams for an Audi A4. It details the fuse box locations and various electrical connections related to the trailer socket, trailer detector control unit, and terminal 30 fuse for trailer towing. Key components mentioned include the main fuse, 9-point relay carrier, trailer socket, and connections to the onboard power supply control unit.

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Marek Łukawski
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450 views4 pages

A4 - Od 2001 - Hak

This document contains current flow diagrams for an Audi A4. It details the fuse box locations and various electrical connections related to the trailer socket, trailer detector control unit, and terminal 30 fuse for trailer towing. Key components mentioned include the main fuse, 9-point relay carrier, trailer socket, and connections to the onboard power supply control unit.

Uploaded by

Marek Łukawski
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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WI-XML Strona 1 z 4

Audi A4 Current Flow Diagram No.  22 / 1 


Edition 05.2003
 
Trailer socket 
From model year 2001 
Main fuse

 
   On battery

Fuse box

 
  Dash panel, driver's side
Fuse colours
30 A - green
25 A - white
WI-XML Strona 2 z 4

20 A - yellow
15 A - blue
10 A - red
7.5 A - brown
5 A - beige

Note:
From fuse number 23 upwards the fuses in the fuse box are designated as 223 etc. in the Current Flow Diagram.

9-point relay carrier with onboard power supply control unit

 
   Dash panel, driver's side, behind 3-point relay carrier
G - Terminal 30 fuse - trailer towing (S77)
WI-XML Strona 3 z 4

Audi A4 Current Flow Diagram No.  22 / 2


Brake light switch, trailer detector control unit, fuse in 
fuse box 
D  -   Ignition/starter switch
F  -   Brake light switch
J345  -   Trailer detector control unit
S14  -   Fuse in fuse box/relay plate
S227  -   Fuse in fuse box
-   Earth connection -1-, in rear wiring harness
  86 

-   Screw connection -2- (30), on relay plate
  501 

- Positive (+) connection (15), in dash panel wiring 
  A2 
   harness
-   Connection (54), in dash panel wiring harness
  A18 

- Positive (+) connection (30), in dash panel wiring 
  A32 
   harness
- Positive (+) connection -3- (30), in dash panel 
  A57 
   wiring harness
- Positive (+) connection -4- (30), in dash panel 
  A98 
   wiring harness
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
WI-XML Strona 4 z 4

Audi A4 Current Flow Diagram No.  22 / 3


Trailer detector control unit, terminal 30 fuse - trailer 
towing, trailer socket 
E23  -   Front and rear fog light switch
F216  -   Rear fog light cut-out, contact switch
J345  -   Trailer detector control unit
J446  -   Parking aid control unit
J519  -   Onboard power supply control unit
L46  -   Rear fog light bulb, left
T32b  - 32-pin connector, grey, on onboard power supply 
   control unit
S77  -   Terminal 30 fuse, trailer towing
U10  -   Trailer socket
-   Earth connection -1-, in rear wiring harness
  86 

- Connection (NSL (rear fog light)), in dash panel 
  A88 
   wiring harness
- Connection (convenience CAN bus, high), in dash 
  A146 
   panel wiring harness
- Connection (convenience CAN bus, low), in dash 
  A147 
   panel wiring harness
*  -   Applies to Lowline equipment
ws = white **  -   Applies to Highline equipment only
sw = black ***  -   Applies to parking aid only
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 

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