Wiring Diagram AUDI A4 2003 - Airbags on driver’s and front passenger’s side - belt tensioners - igniters
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Automotive Electricians Portal FZCO
| D | Ignition/starter switch |
| F138 | Airbag coil connector, return spring with slip ring |
| J234 | Airbag control unit |
| N95 | Airbag igniter, driver's side |
| N131 | Airbag igniter 1, front passenger's side |
| N153 | Belt tensioner igniter -1-, driver's side |
| N154 | Belt tensioner igniter -2-, front passenger's side |
| T2a | 2-pin connector, yellow-blue, vehicle interior, on driver's seat |
| T2b | 2-pin connector, yellow-blue, vehicle interior, on front passenger's seat |
| T4e | 4-pin connector, yellow, on steering column electronics control unit |
| T4f | 4-pin connector, yellow, vehicle interior, near glove box |
| 109 | Earth connection, in airbag wiring harness |
| 312 | Earth connection -2-, in airbag wiring harness |
| 637 | Earth point, airbag control unit |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| Short circuit bridge becomes effective when connector is unplugged. |
Wiring Diagram AUDI A4 2003 - Curtain airbags (driver’s and front passenger’s side) - igniters
| J234 | Airbag control unit |
| N251 | Curtain airbag igniter, driver's side |
| N252 | Curtain airbag igniter, front passenger's side |
| T2l | 2-pin connector, yellow-blue, connector point, vehicle interior, headliner, front left |
| T2m | 2-pin connector, yellow-blue, connector point, vehicle interior, headliner, front right |
| T4g | 4-pin connector, yellow, connector point, vehicle interior, headliner, front left |
| T4h | 4-pin connector, yellow, connector point, vehicle interior, headliner, front right |
| 249 | Earth connection -2-, in interior wiring harness |
| 277 | Earth connection -3-, in interior wiring harness |
| * | Only models with curtain airbags (saloons) |
| ** | Only models with curtain airbags (Avant) |
| Short circuit bridge becomes effective when connector is unplugged. |
Wiring Diagram AUDI A4 2003 - Airbag deactivation on front passenger’s side
| E26 | Glove box light switch |
| E224 | Airbag disabling key switch, front passenger's side |
| J234 | Airbag control unit |
| J393 | Convenience system central control unit |
| K145 | Airbag disabled warning lamp, front passenger's side |
| T12d | 12-pin connector, brown, glove box |
| T12h | 12-pin connector, black, on convenience system central control unit |
| T17f | 17-pin connector, orange, connector point, A pillar, left |
| W | Interior light, front |
| W6 | Glove box light |
| 109 | Earth connection, in airbag wiring harness |
| 238 | Earth connection -1-, in interior wiring harness |
| B250 | Positive (+) connection, in roof wiring harness |
| * | Only applies to models with airbag disabling key switch |
| # | Phased-in modification |
Wiring Diagram AUDI A4 2003 - Side airbags (driver’s and front passenger’s side) - igniters
| J234 | Airbag control unit |
| J393 | Convenience system central control unit |
| J526 | Telephone, telematics control unit |
| N199 | Side airbag igniter, driver's side |
| N200 | Side airbag igniter, front passenger's side |
| T3c | 3-pin connector, yellow, vehicle interior, near driver's seat |
| T3d | 3-pin connector, yellow, vehicle interior, near front passenger's seat |
| T12i | 12-pin connector, black, on convenience system central control unit (used to be connector 3) |
| T17d | 17-pin connector, red, connector point, electronics box, plenum chamber |
| 312 | Earth connection 2, in airbag wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| * | ⇒ Applicable engine Current Flow Diagram |
| ** | Applies to models with seat adjustment ⇒ applicable Current Flow Diagram |
| *** | ⇒ Applicable Current Flow Diagram: Telematics |
| Short circuit bridge becomes effective when connector is unplugged. |
Wiring Diagram AUDI A4 2003 - Rear side airbags (driver’s and front passenger’s side) - igniters - side airbag crash sensors
| G179 | Side airbag crash sensor, driver's side |
| G180 | Side airbag crash sensor, front passenger's side |
| G256 | Rear side airbag crash sensor, driver's side |
| G257 | Rear side airbag crash sensor, front passenger's side |
| J234 | Airbag control unit |
| N201 | Rear side airbag igniter, driver's side |
| N202 | Rear side airbag igniter, front passenger's side |
| T4i | 4-pin connector, yellow, connector point: vehicle interior, rear left |
| T4j | 4-pin connector, yellow, connector point: vehicle interior, rear right |
| 109 | Earth connection, in airbag wiring harness |
| 312 | Earth connection -2-, in airbag wiring harness |
| Short circuit bridge becomes effective when connector is unplugged. |
Wiring Diagram AUDI A4 2003 - Belt switches - rear belt tensioners
| E24 | Belt switch, driver's side |
| E25 | Belt switch, front passenger's side |
| F140 | Front left belt switch |
| F141 | Front right belt switch |
| J234 | Airbag control unit |
| N196 | Rear belt tensioner igniter, driver's side |
| N197 | Rear belt tensioner igniter, front passenger's side |
| N198 | Rear belt tensioner igniter, centre |
| T8b | 8-pin connector, black, belt switch, driver's side |
| T8c | 8-pin connector, black, belt switch, front passenger's side |
| 109 | Earth connection in airbag wiring harness |
| 277 | Earth connection 3, in interior wiring harness |
| * | Only applies to models with belt switches |
| ** | Only applies to models with rear belt tensioners |
| *** | Only applies to models with seat belt warning |
Wiring Diagram AUDI A4 2003 - Front airbag crash sensors for driver’s and front passenger’s side - control unit with display in dash panel insert
| G283 | Front airbag crash sensor, driver's side |
| G284 | Front airbag crash sensor, front passenger's side |
| J234 | Airbag control unit |
| J285 | Control unit with display in dash panel insert |
| K75 | Airbag warning lamp |
| T16 | 16-pin connector, black, diagnostic connector |
| T17a | 17-pin connector, red, connector point, A pillar, left |
| T17c | 17-pin connector, red, connector point, A pillar, right |
| T32a | 32-pin connector, green, on dash panel insert |
| 109 | Earth connection, in airbag wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| • | Data bus wire (CAN bus) |
AUDI A4 2003 Control units overview
Control units overview | | | | Audi A4 | Fitting Locations | No. 804 / 2 |
|
| q | Location for navigation system RNS-E |
| Audi A4 | Fitting Locations | No. 804 / 3 |
|
| Diesel direct injection system control unit -J248- |
| 17 - | Automatic gearbox control unit -J217- |
| q | for models with multitronic® only |
AUDI A4 2003 Motronic control unit -J220-, diesel direct injection system control unit -J248-, Simos control unit -J361-
Motronic control unit -J220-, diesel direct injection system control unit -J248-, Simos control unit -J361- | | | | On electronics box in plenum chamber | | | |
AUDI A4 2003 Automatic gearbox control unit -J217-
Automatic gearbox control unit -J217- | | not for models with multitronic® |
| | | In electronics box in plenum chamber | | for models with multitronic® only | | | |
AUDI A4 2003 ABS control unit -J104-
AUDI A4 2003 Radiator fan control unit -J293- | Radiator fan control unit -J293- | | | AUDI A4 2003 Fresh air blower control unit -J126-
AUDI A4 2003 Headlight range control, control unit -J431- | Headlight range control, control unit -J431- | | | AUDI A4 2003 Steering column electronics control unit -J527-
AUDI A4 2003 Display control unit in dash panel insert -J285- | Display control unit in dash panel insert -J285- | | | | In the dash panel behind the display unit | | | |
AUDI A4 2003 Airbag control unit -J234-
AUDI A4 2003 Onboard power supply control unit -J519- | Onboard power supply control unit -J519- | | | | Behind driver's storage compartment | | | |
AUDI A4 2003 Trailer detector control unit -J345-
AUDI A4 2003 Parking aid control unit -J446- | Parking aid control unit -J446- | | | | In left luggage compartment, behind side trim, on apron | | | |
AUDI A4 2003 Navigation operating electronics control unit -J402-
Navigation operating electronics control unit -J402- | | for navigation system RNS-D only |
| |
AUDI A4 2003 Radio -R-Radio -R- |
| not for navigation system | | | |
AUDI A4 2003 Navigation system with CD drive control unit -J401-
Navigation system with CD drive control unit -J401- | | For navigation system NS-Low only |
| | | For navigation system RNS-E only | | | |
AUDI A4 2003 Control unit with display for radio and navigation system -J503-
Control unit with display for radio and navigation system -J503- | | for navigation system RNS-Low only |
AUDI A4 2003 CD changer -R41-
CD changer -R41- |
| | AUDI A4 2003 Telephone and telematics control unit, telematics -J526-
Telephone and telematics control unit, telematics -J526- | | For models with telematics only |
| in electronics box under front passenger seat |
| |
AUDI A4 2003 Language input control unit -J507-Language input control unit -J507- |
| For models with telematics only | | in electronics box under front passenger seat | | | |
AUDI A4 2003 Convenience system central control unit -J393-
Convenience system central control unit -J393- | | | AUDI A4 2003 Driver door control unit -J386-
AUDI A4 2003 Front passenger side door control unit -J387- | Front passenger side door control unit -J387- | | | | In window regulator motor integrated | | | |
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