| E221 | Operating unit in steering wheel |
| H | Horn plate |
| H2 | High tone horn |
| H7 | Low tone horn |
| J4 | Dual tone horn relay |
| S2 | Fuse in fuse carrier |
| S8 | Fuse in fuse carrier |
| S9 | Fuse in fuse carrier |
| T2bv | 2-pin connector, black, behind steering column switch trim |
| T5b | 5-pin connector, yellow, behind steering column switch trim |
| T5l | 5-pin connector, black, behind steering column switch trim |
| T10v | 10-pin connector, in bumper, front left |
| Z36 | Heated steering wheel |
| 129 | Earth connection, in dual tone horn wiring harness |
| A52 | Positive (+) connection 2 (30), in dash panel wiring harness |
| A80 | Connection -1- (X), in dash panel wiring harness |
| C13 | Positive (+) connection, in dual tone horn wiring harness |
| E105 | Earth connection, in dash panel wiring harness, left |
| E221 | Operating unit in steering wheel |
| F138 | Airbag coil connector |
| J218 | Combi-processor in dash panel insert |
| J234 | Airbag control unit |
| J453 | Multi-function steering wheel control unit |
| N95 | Airbag igniter, driver's side |
| S4 | Fuse in fuse carrier |
| T2bm | 2-pin connector, yellow, electronics box in footwell, front right |
| T5b | 5-pin connector, yellow, behind steering column switch trim |
| T16a | 16-pin connector, diagnosis connection |
| T32b | 32-pin connector, grey, on dash panel insert |
| A19 | Connection (58s), in dash panel wiring harness (switch illumination) |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| E109 | Connection (30, central electrics), in dash panel wiring harness |
| L11 | Connection -3-, in air conditioner wiring harness |
| Short circuit bridge becomes effective when connector is unplugged |
| D | Ignition/starter switch |
| E94 | Heated driver's seat adjuster |
| J218 | Combi-processor in dash panel insert |
| J453 | Multi-function steering wheel control unit |
| R | Radio |
| S1 | Fuse in fuse carrier |
| T6h | 6-pin connector, green, radio connector I-2 |
| T10e | 10-pin connector, green, footwell, right, at wheelhouse, behind carpet |
| T15 | 15-pin connector, black, in centre console |
| T32b | 32-pin connector, grey, on dash panel insert |
| 44 | Earth point, lower part of left A-pillar |
| 108 | Earth connection -2-, in front left wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| E103 | Connection (15a), in dash panel wiring harness, right |
| E105 | Earth connection, in dash panel wiring harness, left |
| * | Models with telephone or with radio navigation system |
| ** | Radio without CAN bus |
| J217 | Automatic gearbox control unit |
| J218 | Combi-processor in dash panel insert |
| J453 | Multi-function steering wheel control unit |
| J526 | Telephone/telematics control unit |
| R | Radio |
| T6h | 6-pin connector, green, radio connector I - 2 |
| T10 | 10-pin connector, blue, connector point, electronics box, plenum chamber |
| T10b | 10-pin connector, yellow, connector point, electronics box, plenum chamber |
| T15 | 15-pin connector, black, in centre console |
| T32a | 32-pin connector, green, on dash panel insert |
| T46 | 46-pin connector, on telephone/telematics control unit |
| A148 | Connection (navigation CAN bus, high), in dash panel wiring harness |
| A149 | Connection (navigation CAN bus, low), in dash panel wiring harness |
| V41 | Connection (high bus), in communication systems wiring harness |
| V42 | Connection (low bus), in communication systems wiring harness |
| • | CAN bus (data wire) |
| * | Radio with CAN bus |
| ** | Models with Tiptronic |
| J412 | Operating electronics control unit, telephone |
| J453 | Multi-function steering wheel control unit |
| R36 | Telephone transmitter and receiver unit |
| R37 | Telephone handset |
| T8d | 8-pin connector, on telephone handset |
| T10v | 10-pin connector, in bumper, front left |
| T15 | 15-pin connector, black, in centre console |
| T18a | 18-pin connector, (VDA connector), on operating electronics control unit, telephone |
| T25 | 25-pin connector, at R36, in luggage compartment, right |
| 108 | Earth connection -2-, in front left wiring harness |
| 129 | Earth connection, in dual tone horn wiring harness |
| 266 | Earth connection, in navigation wiring harness |
| 270 | Earth connection, in telephone wiring harness |
| E105 | Earth connection, in dash panel wiring harness, left |
| V15 | Connection, in telephone wiring harness |
| * | Models with mobile phone |
| ** | Models with telephone |
| *** | Telephone/mobile phone without CAN bus |
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