Wiring Diagram AUDI A4 2003 - Ignition/starter switch - control unit for headlight range control - fuses
| C | Alternator |
| D | Ignition/starter switch |
| E1 | Light switch |
| J285 | Control unit with display in dash panel insert |
| J431 | Headlight range control, control unit |
| S10 | Fuse in relay plate fuse holder |
| S20 | Fuse in relay plate fuse holder |
| S21 | Fuse in relay plate fuse holder |
| T2 | 2-pin connector, black, in right engine compartment |
| T10 | 10-pin connector, black, coupling station on electronics box, plenum chamber |
| T32a | 32-pin connector, green, on dash panel insert |
| 33 | Earth point, on right behind dash panel |
| 238 | Earth connection 1, in interior wiring harness |
| 501 | Screw connection 2 (30), on relay plate |
| A2 | Positive connection (15), in dash panel wiring harness |
| A17 | Connection (61), in dash panel wiring harness |
| A32 | Positive connection (30), in dash panel wiring harness |
| A51 | Connection (56), in dash panel wiring harness |
| * | For lowline equipment only |
| ** | For highline equipment only |
Wiring Diagram AUDI A4 2003 - Control unit for headlight range control - vehicle inclination sender
| G76 | Rear left vehicle level sender |
| G78 | Front left vehicle level sender |
| J104 | ABS control unit with EDL |
| J431 | Headlight range control, control unit |
| T4s | 4-pin connector, black, on rear left vehicle level sender |
| T16 | 16-pin connector, black, diagnostic connector |
| T17 | 17-pin connector, black, coupling station on left A-pillar |
| T17a | 17-pin connector, red, coupling station on left A-pillar |
| A133 | Connection (left ABS impulse), in dash panel wiring harness |
| A159 | Connection (L), in dash panel wiring harness |
| Z20 | Connection in adaptive suspension system wiring harness |
| Z21 | Positive connection (x), in adaptive suspension system wiring harness |
Wiring Diagram AUDI A4 2003 - Headlight range control - control unit - left gas discharge (xenon) bulb - left headlight range control motor
| J343 | Left gas discharge light control unit |
| J431 | Headlight range control, control unit |
| J519 | Onboard supply control unit |
| L13 | Left gas discharge (xenon) bulb |
| M1 | Left side light bulb |
| M5 | Front left turn signal bulb |
| M30 | Left main beam bulb |
| T17a | 17-pin connector, red, coupling station on left A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| V48 | Left headlight range control motor |
| 26 | Earth point, on front apron |
| 179 | Earth connection, in left headlight wiring harness |
| A6 | Positive connection (left turn signal), in dash panel wiring harness |
| A84 | Connection (58L), in dash panel wiring harness |
| B167 | Connection (56b), in interior wiring harness |
| E117 | Connection (56a, left), in dash panel wiring harness |
| * | For lowline equipment only |
| ** | For highline equipment only |
| *** | for models with automatic headlight switching / surround lighting only |
Wiring Diagram AUDI A4 2003 - Headlight range control - control unit - right gas discharge (xenon) bulb - right headlight range control motor
| J344 | Right gas discharge light control unit |
| J431 | Headlight range control, control unit |
| J519 | Onboard supply control unit |
| L14 | Right gas discharge (xenon) bulb |
| M3 | Right side light bulb |
| M7 | Front right turn signal bulb |
| M32 | Right main beam bulb |
| T17c | 17-pin connector, red, coupling station right A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| V49 | Right headlight range control motor |
| 43 | Earth point, lower part of right A-pillar |
| 176 | Earth connection, in right headlight wiring harness |
| A5 | Positive connection (right turn signal), in dash panel wiring harness |
| A85 | Connection (58R), in dash panel wiring harness |
| E116 | Connection (56a, right), in dash panel wiring harness |
| * | For lowline equipment only |
| ** | For highline equipment only |
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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| Audi A4 | Fitting Locations | No. 804 / 16 |
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