Wiring Diagram AUDI A4 2003 - Tail lights - left (Lowline)
E23 | Front and rear fog light switch |
F | Brake light switch |
F4 | Reversing light switch |
J519 | Onboard power supply control unit |
L46 | Rear fog light bulb, left |
M4 | Tail light bulb, left |
M6 | Turn signal bulb, rear left |
M9 | Brake light bulb, left |
M16 | Reversing light bulb, left |
T17d | 17-pin connector, red, connector point, electronics box, plenum chamber |
T23 | 23-pin connector, black, on onboard power supply control unit |
T32b | 32-pin connector, grey, on onboard power supply control unit |
86 | Earth connection -1-, in rear wiring harness |
A6 | Positive (+) connection (left turn signal), in dash panel wiring harness |
A18 | Connection (54), in dash panel wiring harness |
A84 | Connection (58L), in dash panel wiring harness |
A87 | Connection (RF (reversing light)), in dash panel wiring harness |
A88 | Connection (NSL (rear fog light)), in dash panel wiring harness |
* | Only applies to models without trailer socket |
** | Applicable from model year 2004 |
Wiring Diagram AUDI A4 2003 - Tail lights - right (Lowline)
J519 | Onboard power supply control unit |
M2 | Tail light bulb, right |
M8 | Turn signal bulb, rear right |
M10 | Brake light bulb, right |
M17 | Reversing light bulb, right |
M25 | High level brake light bulb |
T6i | 6-pin connector, brown, behind side trim, rear left |
T23 | 23-pin connector, black, on onboard power supply control unit |
T32b | 32-pin connector, grey, on onboard power supply control unit |
218 | Earth connection -1-, in rear lid wiring harness |
249 | Earth connection -2-, in interior wiring harness |
A5 | Positive (+) connection (right turn signal), in dash panel wiring harness |
A18 | Connection (54), in dash panel wiring harness |
A85 | Connection (58R), in dash panel wiring harness |
A87 | Connection (RF (reversing light)), in dash panel wiring harness |
Wiring Diagram AUDI A4 2003 - Tail lights (Highline)
J519 | Onboard power supply control unit |
L46 | Rear fog light bulb, left |
M2 | Tail light bulb, right |
M4 | Tail light bulb, left |
M6 | Turn signal bulb, rear left |
M8 | Turn signal bulb, rear right |
M9 | Brake light bulb, left |
M10 | Brake light bulb, right |
M16 | Reversing light bulb, left |
M17 | Reversing light bulb, right |
M25 | High level brake light bulb |
T6i | 6-pin connector, brown, behind side trim, rear left |
T23 | 23-pin connector, black, on onboard power supply control unit |
T32b | 32-pin connector, grey, on onboard power supply control unit |
86 | Earth connection -1-, in rear wiring harness |
218 | Earth connection -1-, in rear lid wiring harness |
249 | Earth connection -2-, in interior wiring harness |
A88 | Connection (NSL (rear fog light)), in dash panel wiring harness |
B186 | Connection -2- (BL (turn signal, left)), in interior wiring harness |
B187 | Connection -2- (BR (turn signal, right)), in interior wiring harness |
* | M2/M4 in twin filament bulb (5W) not required. |
** | Applicable from model year 2004 |
Wiring Diagram AUDI A4 2003 - Rear window wiper motor - washer pump - number plate light
J59 | X contact relief relay |
J519 | Onboard power supply control unit |
S236 | Fuse in fuse box |
T4l | 4-pin connector, black, in rear lid |
T8j | 8-pin connector, black, behind side trim, rear left |
T10b | 10-pin connector, black, on onboard power supply control unit |
T17 | 17-pin connector, black, connector point, A pillar, left |
T23 | 23-pin connector, black, on onboard power supply control unit |
T32b | 32-pin connector, grey, on onboard power supply control unit |
V5 | Washer pump |
V12 | Rear window wiper motor |
X | Number plate light |
218 | Earth connection -1-, in rear lid wiring harness |
219 | Earth connection -2-, in rear lid wiring harness |
654 | Earth point, right D pillar |
A34 | Connection (75x), in dash panel wiring harness |
B132 | Connection (number plate light), in interior wiring harness |
Wiring Diagram AUDI A4 2003 - Glass breakage sensors - heated rear window
C18 | Window aerial suppression filter |
E1 | Light switch |
E87 | Air conditioning system/Climatronic operating and display unit |
G183 | Glass breakage sensor, rear left side window |
G184 | Glass breakage sensor, rear right side window |
J285 | Control unit in dash panel insert |
T6i | 6-pin connector, brown, behind side trim, rear left |
T32a | 32-pin connector, green, on dash panel insert |
Z1 | Heated rear window |
Z24 | Heated rear window with window aerial |
52 | Earth point in rear lid, left |
53 | Earth point in rear lid, right |
219 | Earth connection 2, in rear lid wiring harness |
A175 | Connection (58s), in dash panel wiring harness |
B180 | Connection (heated rear window), in interior wiring harness |
* | Only applies to models with anti-theft alarm system |
** | Only applies to models with radio |
*** | Only applies to models without radio |
**** | Applicable from model year 2004 |
***** | Only applies to models with radio Concert or Symphony |
Wiring Diagram AUDI A4 2003 - Luggage compartment light - rear lid light
J285 | Control unit with display in dash panel insert |
J393 | Convenience system central control unit |
T8j | 8-pin connector, black, behind side trim, rear left |
T12d | 12-pin connector, brown, near glove box |
T12h | 12-pin connector, black, on convenience system central control unit |
T17f | 17-pin connector, orange, connector point, A pillar, left |
T32a | 32-pin connector, green, on dash panel insert |
W3 | Luggage compartment light |
W6 | Glove box light |
W51 | Rear lid light |
347 | Earth connection, in roof wiring harness |
A175 | Connection (58s), in dash panel wiring harness |
B250 | Positive (+) connection, in roof wiring harness |
B270 | Connection (58s), in roof wiring harness |
* | Only applies to models with airbag disabling key switch |
Wiring Diagram AUDI A4 2003 - Rear lid contact switch for anti-theft alarm - rear lid release
F123 | Rear lid contact switch for anti-theft alarm |
F248 | Release button for rear lid lock cylinder |
J393 | Convenience system central control unit |
T4l | 4-pin connector, black, in rear lid |
T6i | 6-pin connector, brown, behind side trim, rear left |
T8j | 8-pin connector, black, behind side trim, rear left |
T12h | 12-pin connector, black, on convenience system central control unit |
T16i | 16-pin connector, brown, on convenience system central control unit |
T20g | 20-pin connector, red, on convenience system central control unit |
V139 | Rear lid release motor |
52 | Earth point in rear lid, left |
218 | Earth connection -1-, in rear lid wiring harness |
653 | Earth point, left D pillar |
B154 | Connection -1- (TK (door contact)), in interior wiring harness |
* | Only applies to models with anti-theft alarm system |
Wiring Diagram AUDI A4 2003 - Aerials for radio
F124 | Contact switch in lock cylinder for rear lid anti-theft alarm system/central locking system |
J393 | Convenience system central control unit |
R | Radio |
R1 | Aerial connection |
R64 | Auxiliary heating radio controlled receiver |
R108 | Aerial module, left |
T6i | 6-pin connector, brown, behind side trim, rear left |
T16i | 16-pin connector, brown, on convenience system central control unit (used to be connector 5) |
218 | Earth connection 1, in rear lid wiring harness |
* | Side window, rear left |
** | Side window, rear right |
*** | Only applies to models with auxiliary heater |
**** | Applicable up to October 2003 |
***** | Only applies to models with radio Concert or Symphony |
Wiring Diagram AUDI A4 2003 - Aerials for radio navigation system
J402 | Operating electronics control unit, navigation |
R1 | Aerial connection |
R64 | Auxiliary heating radio controlled receiver |
R94 | Navigation interface |
R108 | Aerial module, left |
Z24 | Heated rear window with window aerial |
* | Side window, rear left |
** | Side window, rear right |
*** | Only applies to models with auxiliary heater |
Wiring Diagram AUDI A4 2003 - Aerials for radio navigation system with TV receiver
J402 | Operating electronics control unit, navigation |
J415 | Navigation/TV tuner |
R1 | Aerial connection |
R64 | Auxiliary heating radio controlled receiver |
R94 | Navigation interface |
R108 | Aerial module, left |
R109 | Aerial module, right |
Z24 | Heated rear window with window aerial |
* | Side window, rear left |
** | Side window, rear right |
*** | Only applies to models with auxiliary heater |
**** | Only applies to models without digital TV tuner, digital TV tuner ⇒ applicable Current Flow Diagram |
AUDI A4 2003 Control units overview
1 - | Heated windscreen control unit -J505- |
q | Location → page 804/4 |
2 - | CD changer -R41- |
q | Location → page 804/13 |
3 - | Fresh air blower control unit -J126- |
q | Location ⇒ page → 804/7 |
4 - | Headlight range control, control unit -J431- |
q | Location → page 804/7 |
5 - | Radio -R- |
q | not for navigation system |
q | Location → page 804/11 |
5 - | Navigation operating electronics control unit -J402- |
q | for navigation system RNS-D only |
q | Location → page 804/11 |
5 - | Control unit with display for radio and navigation system -J503- |
q | for navigation system RNS-Low only |
q | Location → page 804/13 |
Audi A4 | Fitting Locations | No. 804 / 2 |
5 - | Navigation system with CD drive control unit -J401- |
q | Location for navigation system NS-Low → page 804/12 |
q | Location for navigation system RNS-E → page 804/12 |
6 - | Telephone and telematics control unit, telematics -J526- |
q | Location → page 804/14 |
6 - | Language input control unit -J507- |
q | Location → page 804/14 |
7 - | Steering column electronics control unit -J527- |
q | Location → page 804/8 |
8 - | Front passenger side door control unit -J387- |
q | Location → page 804/16 |
9 - | Display control unit in dash panel insert -J285- |
q | Location → page 804/8 |
10 - | Airbag control unit -J234- |
q | Location → page 804/9 |
11 - | Driver door control unit -J386- |
q | Location → page 804/16 |
Audi A4 | Fitting Locations | No. 804 / 3 |
12 - | Convenience system central control unit -J393- |
q | Location → page 804/15 |
13 - | Onboard power supply control unit -J519- |
q | Location → page 804/9 |
14 - | Motronic control unit -J220- |
14 - | Diesel direct injection system control unit -J248- |
14 - | Simos control unit -J361- |
q | Location → page 804/4 |
15 - | Automatic gearbox control unit -J217- |
q | not for models with multitronic® |
q | Location → page 804/5 |
16 - | ABS control unit -J104- |
q | Location → page 804/6 |
17 - | Automatic gearbox control unit -J217- |
q | for models with multitronic® only |
q | Location → page 804/5 |
18 - | Radiator fan control unit -J293- |
q | Location → page 804/6 |
Audi A4 | Fitting Locations | No. 804 / 4 |
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