Wiring Diagram AUDI A4 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 - 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 2004 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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