Wiring Diagram AUDI A4 2005 - Taxi meter - fuses - connector for printer/chip card reader
| D | Ignition/starter switch |
| G41 | Taxi meter |
| J104 | ABS control unit with EDL |
| S55 | Two-way radio fuse |
| S57 | Alarm system fuse |
| S182 | Taxi meter fuse |
| S183 | Taxi meter and alarm system fuse |
| S184 | Socket 1 fuse |
| T5 | 5-pin connector, black, for printer/chip card reader |
| T17b | 17-pin connector, green, coupling station on left of A-pillar |
| 81 | Earth connection 1, in dash panel wiring harness |
| 238 | Earth connection 1, in interior wiring harness |
| 284 | Earth connection 6, in interior wiring harness |
| 285 | Earth connection 7, in interior wiring harness |
| 501 | Screw connection 2 (30), on relay plate |
| A21 | Connection (86s), in dash panel wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A52 | Positive connection 2 (30), in dash panel wiring harness |
| A98 | Positive connection 4 (30), in dash panel wiring harness |
| * | Fuse was increased from 20 A to 25 A, applicable from September 2003 |
Wiring Diagram AUDI A4 2005 - Taxi alarm system 2 switch - alarm system off switch - alarm system control unit - taxi alarm system 2 control unit - taxi roof sign light bulb
| E216 | Taxi alarm system 2 switch |
| E217 | Alarm system off switch |
| J29 | Blocking diode |
| J85 | Alarm system control unit |
| J430 | Taxi alarm system 2 control unit |
| L36 | Taxi roof sign light bulb |
| T4r | 4-pin connector, grey for taxi roof sign light |
| 284 | Earth connection 6, in interior wiring harness |
| 285 | Earth connection 7, in interior wiring harness |
| Q51 | Positive connection (30), in alarm system wiring harness |
| * | Taxi roof sign light new |
| ** | Taxi roof sign light old |
Wiring Diagram AUDI A4 2005 - Taxi sign switch - alarm system control unit - alarm system relay 2 main beam - special vehicle control unit
| E1 | Light switch |
| E138 | Taxi sign switch |
| J85 | Alarm system control unit |
| J285 | Control unit in dash panel insert |
| J461 | Alarm system relay 2, main beam |
| J519 | Onboard supply control unit |
| J608 | Special vehicle control unit |
| M30 | Left main beam bulb |
| M32 | Right main beam bulb |
| S20 | Fuse in relay plate fuse holder |
| S21 | Fuse in relay plate fuse holder |
| T1e | Single connector, near light switch |
| T32a | 32-pin connector, green, on dash panel insert |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| 284 | Earth connection 6, in interior wiring harness |
| 285 | Earth connection 7, in interior wiring harness |
| A51 | Connection (56), in dash panel wiring harness |
| A175 | Connection (58s), in dash panel wiring harness |
| E116 | Connection (56a, right), in dash panel wiring harness |
| E117 | Connection (56a, left), in dash panel wiring harness |
| * | For lowline equipment only |
| ** | For highline equipment only |
Wiring Diagram AUDI A4 2005 - Alarm system control unit - alarm system relay turn signal
| H2 | Treble tone horn |
| H7 | Bass tone horn |
| J29 | Blocking diode |
| J85 | Alarm system control unit |
| J462 | Alarm system relay 3, left turn signal |
| J463 | Alarm system relay 4, right turn signal |
| M5 | Front left turn signal bulb |
| M6 | Rear left turn signal bulb |
| M7 | Front right turn signal bulb |
| M8 | Rear right turn signal bulb |
| M18 | Left side mounted turn signal bulb |
| M19 | Right side mounted turn signal bulb |
| 285 | Earth connection 7, in interior wiring harness |
| A5 | Positive connection (right turn signal), in dash panel wiring harness |
| A6 | Positive connection (left turn signal), in dash panel wiring harness |
| A180 | Positive connection 2 (right turn signal), in dash panel wiring harness |
| A181 | Positive connection 2 (left turn signal), in dash panel wiring harness |
| B186 | Connection 2 (LTS), in interior wiring harness |
| B187 | Connection 2 (RTS), in interior wiring harness |
| E112 | Connection (horn, 87h), in dash panel wiring harness |
| * | For lowline equipment only |
| ** | For highline equipment only |
Wiring Diagram AUDI A4 2005 - Alarm on and hands-free system control unit - two-way radio - 12 V socket
| E2 | Turn signal switch |
| E75 | Alarm system switch |
| J527 | Steering column electronics control unit |
| J610 | Alarm on and hands-free system control unit |
| R | Radio |
| R1 | Aerial connection |
| R8 | Two-way radio |
| R11 | Aerial |
| R25 | Two-way radio loudspeaker |
| T16a | 16-pin connector, black, on steering column electronics control unit |
| U5 | 12 V socket |
| 284 | Earth connection 6, in interior wiring harness |
| 285 | Earth connection 7, in interior wiring harness |
AUDI A4 2005 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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