| D | Ignition/starter switch |
| E221 | Operating unit in steering wheel |
| F138 | Airbag coil connector, return spring with slip ring |
| J453 | Multi-function steering wheel control unit |
| S5 | Fuse in fuse box/relay plate |
| S240 | Fuse in fuse box |
| S242 | Fuse in fuse box |
| S326 | Multi-function steering wheel fuse |
| T3l | 3-pin connector, vehicle interior, in steering wheel |
| T5k | 5-pin connector, yellow, vehicle interior, at steering column |
| T18 | 18-pin connector, on multi-function steering wheel control unit |
| 285 | Earth connection -7-, in interior wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A46 | Positive (+) connection (30 - from radio), in dash panel wiring harness |
| B135 | Connection -1- (15a), in interior wiring harness |
| * | From July 2002 onwards |
| ** | As of July 2002 no longer fitted |
| D | Ignition/starter switch |
| E221 | Operating unit in steering wheel |
| F138 | Airbag coil connector, return spring with slip ring |
| H | Horn plate |
| H2 | High tone horn |
| H7 | Low tone horn |
| J4 | Dual tone horn relay |
| N95 | Airbag igniter, driver's side |
| J234 | Airbag control unit |
| J453 | Multi-function steering wheel control unit |
| T5a | 5-pin connector, yellow, vehicle interior, at steering column |
| T5c | 5-pin connector, yellow, vehicle interior, at steering column |
| T18 | 18-pin connector, on multi-function steering wheel control unit |
| 277 | Earth connection -3-, in interior wiring harness |
| 280 | Earth connection, in communication systems wiring harness |
| A72 | Connection (71), in dash panel wiring harness |
| B138 | Positive (+) connection (X), in interior wiring harness |
| Short circuit bridge becomes effective when connector is unplugged |
| F189 | Tiptronic switch |
| J217 | Automatic gearbox control unit |
| J453 | Multi-function steering wheel control unit |
| R36 | Telephone transmitter and receiver unit |
| R88 | Multi-function steering wheel interface |
| T10e | 10-pin connector, black, engine compartment, in plenum chamber |
| T18 | 18-pin connector, on multi-function steering wheel control unit |
| 285 | Earth connection -7-, in interior wiring harness |
| U3 | Connection -1-, in automatic gearbox wiring harness |
| U5 | Connection -2- (15), in automatic gearbox wiring harness |
| U6 | Connection -2-, in automatic gearbox wiring harness |
| V15 | Connection, in telephone wiring harness |
| V16 | Connection (screening), in telephone wiring harness |
| * | Only models with 5-speed automatic gearbox |
| ** | Only applies to telephone, as of model year 2002 no longer fitted |
| *** | As of model year 2002 no longer fitted |
| J218 | Combi-processor in dash panel insert |
| J453 | Multi-function steering wheel control unit |
| T16 | 16-pin connector, black, centre console compartment (diagnostic connector) |
| T18 | 18-pin connector, on multi-function steering wheel control unit |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 277 | Earth connection -3-, in interior wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| B145 | Positive (+) connection (58b), in interior wiring harness |
| * | Only models with 5-speed automatic gearbox |
| ** | As of model year 2002 no longer fitted |
| J189 | Auto-check system |
| J218 | Combi-processor in dash panel insert |
| R | Radio |
| T20a | 20-pin connector, black, on radio |
| T32b | 32-pin connector, grey, on dash panel insert |
| 11 | Earth point, in battery box |
| 30 | Earth point -1-, next to relay plate |
| 277 | Earth connection -3-, in interior wiring harness |
| 280 | Earth connection, in communication systems wiring harness |
| 285 | Earth connection -7-, in interior wiring harness |
| A178 | Connection (infotainment CAN bus, high), in dash panel wiring harness |
| A179 | Connection (infotainment CAN bus, low), in dash panel wiring harness |
| * | Only models with 5-speed automatic gearbox |
| ** | As of model year 2002 no longer fitted |
| *** | Only models with driver information system |
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