| 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 |
| 108 | Earth connection -2-, in front left wiring harness |
| 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 |
| J234 | Airbag control unit |
| J285 | Control unit with display in dash panel insert |
| 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 |
| T10s | 10-pin connector, black, footwell, right, at wheelhouse, behind carpet |
| 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. |
| * | Models with remote control for radio, operated from rear seats |
| D | Ignition/starter switch |
| E94 | Heated driver's seat adjuster |
| 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 |
| 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 |
| * | Does not apply to radio with CAN bus (data wire) |
| F189 | Tiptronic switch |
| J217 | Automatic gearbox control unit |
| J285 | Control unit with display 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 |
| T10g | 10-pin connector, black, near selector lever console |
| 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 |
| E105 | Earth connection, in dash panel wiring harness, left |
| V41 | Connection (high bus), in communication systems wiring harness |
| V42 | Connection (low bus), in communication systems wiring harness |
| • | CAN bus (data wire) |
| * | Models with Tiptronic |
| E39 | Rear electric window isolation switch |
| E52 | Rear left electric window switch, in door |
| E54 | Rear right electric window switch, in door |
| E396 | Rear button for station search |
| E397 | Rear button for volume control |
| J661 | Control unit for radio controls in rear |
| T10o | 10-pin connector, connector plug B at V94 |
| U9 | Cigarette lighter, rear |
| V94 | Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system |
| B104 | Earth connection (rear right), in interior wiring harness |
| B106 | Earth connection (driver's door/1), in interior wiring harness |
| B126 | Connection (87, driver's door), in interior wiring harness |
| B127 | Connection (87, front passenger's door), in interior wiring harness |
| Q14 | Connection (isolation switch), in electric window/central locking and door contact switch wiring harness |
| Q33 | Positive (+) connection (30az), in electric window wiring harness |
