Wiring Diagram AUDI A4 2003 - Voltage supply
J393 | Convenience system central control unit |
R | Radio |
S239 | Fuse in fuse box |
T8 | 8-pin connector, black, radio connector III |
T10l | 10-pin connector, red, radio connector IV |
T20g | 20-pin connector, red, on convenience system central control unit (used to be connector 4) |
346 | Earth connection (audio), in dash panel wiring harness |
501 | Screw connection -2- (30), on relay plate |
610 | Earth point (audio), below 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 |
V49 | Connection (low frequency, NF +), in communication wiring harness |
V50 | Connection (low frequency, NF -), in communication wiring harness |
* | Applies to active loudspeakers only |
** | Applies to Bose loudspeakers only |
*** | Applies to anti-theft alarm system only |
**** | Only applies to models with telephone/telematics or provision for mobile phone |
Wiring Diagram AUDI A4 2003 - Front loudspeakers
R | Radio |
R21 | Bass loudspeaker, front left |
R23 | Bass loudspeaker, front right |
R26 | Mid-range/treble loudspeaker, front left |
R27 | Mid-range/treble loudspeaker, front right |
R70 | Internal loudspeaker (centre loudspeaker) |
T8a | 8-pin connector, brown, radio connector II |
T20 | 20-pin connector, black, door, A pillar, left |
T20a | 20-pin connector, black, door, A pillar, right |
* | Only applies to models with active loudspeakers |
** | Only applies to models with passive loudspeakers |
Wiring Diagram AUDI A4 2003 - Rear loudspeakers
R | Radio |
R15 | Bass loudspeaker, rear left |
R17 | Bass loudspeaker, rear right |
R34 | Mid-range/treble loudspeaker, rear left |
R35 | Mid-range/treble loudspeaker, rear right |
T8a | 8-pin connector, brown, radio connector II |
T20b | 20-pin connector, black, door, B pillar, left |
T20c | 20-pin connector, black, door, B pillar, right |
* | Only applies to models with passive loudspeakers |
Wiring Diagram AUDI A4 2003 - Active loudspeakers - rear
R | Radio |
R12 | Amplifier |
R15 | Bass loudspeaker, rear left |
R17 | Bass loudspeaker, rear right |
R34 | Mid-range/treble loudspeaker, rear left |
R35 | Mid-range/treble loudspeaker, rear right |
R100 | Bass loudspeaker |
T20b | 20-pin connector, black, door, B pillar, left |
T20c | 20-pin connector, black, door, B pillar, right |
T20d | 20-pin connector, black, radio connector I |
346 | Earth connection (audio), in dash panel wiring harness |
* | Only applies to models with active loudspeakers |
Wiring Diagram AUDI A4 2003 - Bose loudspeakers - front
R | Radio |
R12 | Amplifier |
R21 | Bass loudspeaker, front left |
R23 | Bass loudspeaker, front right |
R26 | Mid-range/treble loudspeaker, front left |
R27 | Mid-range/treble loudspeaker, front right |
R70 | Internal loudspeaker (centre loudspeaker) |
T20 | 20-pin connector, black, door, A pillar, left |
T20a | 20-pin connector, black, door, A pillar, right |
T20d | 20-pin connector, black, radio connector I |
133 | Earth connection, in loudspeaker wiring harness |
346 | Earth connection (audio), in dash panel wiring harness |
* | Only applies to models with Bose sound system |
Wiring Diagram AUDI A4 2003 - Bose loudspeakers - rear
R | Radio |
R12 | Amplifier |
R15 | Bass loudspeaker, rear left |
R17 | Bass loudspeaker, rear right |
R34 | Mid-range/treble loudspeaker, rear left |
R35 | Mid-range/treble loudspeaker, rear right |
R100 | Bass loudspeaker |
T20b | 20-pin connector, black, door, B pillar, left |
T20c | 20-pin connector, black, door, B pillar, right |
* | Only applies to models with Bose sound system |
Wiring Diagram AUDI A4 2003 - CD changer
R | Radio |
R41 | CD changer |
T20d | 20-pin connector, black, radio connector I |
309 | Earth connection -1-, screening, in CD changer wiring harness |
310 | Earth connection -2-, screening, in CD changer wiring harness |
V14 | Connection (screening), in CD changer wiring harness |
* | Only applies to models with CD changer |
Wiring Diagram AUDI A4 2003 - Aerial (Avant models)
R | Radio |
R1 | Aerial connection |
R108 | Aerial module, left |
Z24 | Heated rear window with window aerial |
* | Only applies to models with radio Concert or Symphony |
** | Side window, rear left |
*** | Side window, rear right |
Wiring Diagram AUDI A4 2003 - Aerial (saloon models) - diagnostic connector - CAN bus
J285 | Control unit with display in dash panel insert |
R | Radio |
R1 | Aerial connection |
R11 | Aerial |
T8 | 8-pin connector, black, radio connector III |
T16 | 16-pin connector, black, diagnostic connector |
T20d | 20-pin connector, black, radio connector I |
T32 | 32-pin connector, blue, on dash panel insert |
A159 | Connection (L), in dash panel wiring harness |
A178 | Connection (infotainment CAN bus, high), in dash panel wiring harness |
A179 | Connection (infotainment CAN bus, low), in dash panel wiring harness |
* | Does not apply to radio Chorus |
** | Aerial for saloon models |
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 / 5 |
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Audi A4 | Fitting Locations | No. 804 / 6 |
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Audi A4 | Fitting Locations | No. 804 / 7 |
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Audi A4 | Fitting Locations | No. 804 / 8 |
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Audi A4 | Fitting Locations | No. 804 / 9 |
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Audi A4 | Fitting Locations | No. 804 / 10 |
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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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