| 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 |
| J234 | Airbag control unit |
| N95 | Airbag igniter, driver's side |
| S227 | Fuse in fuse box |
| S240 | Fuse in fuse box |
| T2a | 2-pin connector, yellow, connector point, A pillar, left |
| T2bg | 2-pin connector, behind steering column switch trim |
| T5d | 5-pin connector, behind steering column switch trim |
| T6i | 6-pin connector, red, connector point, A pillar, right |
| T10b | 10-pin connector, red, connector point, A pillar, left |
| Z36 | Heated steering wheel |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 176 | Earth connection, in right headlight wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| 199 | Earth connection -3-, in dash panel wiring harness |
| A90 | Connection (dual tone horn), in dash panel wiring harness |
| E112 | Connection (horn-87 h), in dash panel wiring harness |
| * | Both possible |
| Short circuit bridge becomes effective when connector is unplugged |
| D | Ignition/starter switch |
| E94 | Heated driver's seat adjuster |
| J189 | Auto-check system |
| J218 | Combi-processor in dash panel insert |
| J453 | Multi-function steering wheel control unit |
| K | Diagnosis connection |
| R | Radio |
| R88 | Multi-function steering wheel interface |
| T6x | 6-pin connector, green, radio connector I-2 |
| T10x | 10-pin connector, pink, connector point, A pillar, right |
| T16a | 16-pin connector, diagnosis connection |
| T20 | 20-pin connector, red/white, on dash panel insert |
| T32 | 32-pin connector, blue, on dash panel insert |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A19 | Connection (58s), in dash panel wiring harness (switch illumination) |
| A20 | Positive (+) connection (15a), in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A117 | Connection (enable), in dash panel wiring harness |
| A118 | Connection (data), in dash panel wiring harness |
| A119 | Connection (clock), in dash panel wiring harness |
| * | Only models without radio and navigation system |
| ** | Only models without radio and navigation system |
| F189 | Tiptronic switch |
| J217 | Automatic gearbox control unit |
| J453 | Multi-function steering wheel control unit |
| R36 | Telephone transmitter and receiver unit |
| R37 | Telephone handset |
| R88 | Multi-function steering wheel interface |
| T8h | 8-pin connector, for telephone handset, in centre console |
| T10am | 10-pin connector, on selector lever console |
| T15r | 15-pin connector, brown, connector point, right A pillar |
| T15s | 11-pin connector, brown, connector point left A pillar |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 199 | Earth connection -3-, in dash panel wiring harness |
| 270 | Earth connection, in telephone wiring harness |
| A1 | Positive (+) connection (30a), in dash panel wiring harness |
| A52 | Positive (+) connection 2 (30), in dash panel wiring harness |
| U6 | Connection -2-, in automatic gearbox wiring harness |
| U7 | Connection (3), in automatic gearbox wiring harness |
| * | Models with Tiptronic |
| ** | Models with telephone / mobile phone |
| *** | Both possible |
| # | Only models without radio and navigation system |
