Wiring Diagram AUDI A4 2005 - Fuse - internal loudspeaker
| J285 | Control unit with display in dash panel insert |
| R | Radio |
| R70 | Internal loudspeaker |
| S239 | Fuse in fuse holder |
| T8 | 8-connector, black, radio connector III |
| T32a | 32-pin connector, green, on dash panel insert |
| 346 | Earth connection (audio), in dash panel wiring harness |
| 501 | Screw connection 2 (30), on relay plate |
| 610 | Earth point (audio), under centre console, front |
| A46 | Positive connection (30 - from radio), in dash panel wiring harness |
| A57 | Positive connection 3 (30), in dash panel wiring harness |
| A129 | Connection (muting), in dash panel wiring harness |
| A175 | Connection (58s), in dash panel wiring harness |
| V49 | Connection (NF +), in communication wiring harness |
| V50 | Connection (NF -), in communication wiring harness |
| * | for models with telephone / telematics only |
| ** | ⇒ applicable Current Flow Diagram: telephone / telematics |
| *** | ⇒ applicable Current Flow Diagram: telephone / telematics, is dropped, from model year 2006 |
Wiring Diagram AUDI A4 2005 - Front loudspeaker
| R | Radio |
| R21 | Front left bass loudspeaker |
| R23 | Front right bass loudspeaker |
| R26 | Front left mid-range and treble loudspeaker |
| R27 | Front right mid-range and treble loudspeaker |
| T8a | 8-connector, brown, radio connector II |
| T20 | 20-pin connector, black, door A-pillar left |
| T20a | 20-pin connector, black, door A-pillar right |
Wiring Diagram AUDI A4 2005 - Rear loudspeaker - aerial
| J393 | Convenience system central control unit |
| R | Radio |
| R1 | Aerial connection |
| R11 | Aerial |
| R15 | Rear left bass loudspeaker |
| R17 | Rear right bass loudspeaker |
| R34 | Rear left mid-range and treble loudspeaker |
| R35 | Rear right mid-range and treble loudspeaker |
| R64 | Remote control receiver for auxiliary heating |
| R108 | Left aerial module |
| T8a | 8-connector, brown, radio connector II |
| T16i | 16-pin connector, brown, on convenience system central control unit (used to be connector 5) |
| T20b | 20-pin connector, black, door B-pillar left |
| T20c | 20-pin connector, black, door B-pillar right |
| * | Aerial for saloon models |
| ** | Aerial for Avant models |
| *** | for models with auxiliary heating only |
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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| Audi A4 | Fitting Locations | No. 804 / 11 |
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| Audi A4 | Fitting Locations | No. 804 / 12 |
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| Audi A4 | Fitting Locations | No. 804 / 13 |
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| Audi A4 | Fitting Locations | No. 804 / 14 |
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| Audi A4 | Fitting Locations | No. 804 / 15 |
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| Audi A4 | Fitting Locations | No. 804 / 16 |
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