| A | Battery |
| D | Ignition/starter switch |
| J412 | Operating electronics control unit, telephone |
| R | Radio |
| R1 | Aerial connection |
| R51 | Radio/telephone/auxiliary heater aerial |
| R54 | Mobile telephone |
| R86 | Mobile phone amplifier (compensator) |
| S2 | Fuse in fuse carrier |
| S119 | Telephone fuse |
| S204 | Fuse -1- (30) |
| T3as | 3-pin connector, black, in centre console |
| T16g | 16-pin connector, on mobile phone |
| T18a | 18-pin connector, (VDA connector), on operating electronics control unit, telephone |
| TV2 | Terminal 30 junction box |
| 280 | Earth connection, in communication systems wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| V23 | Positive (+) connection (15a), in navigation wiring harness |
| * | Up to 08.00 |
| ** | From 09.00 |
| J218 | Combi-processor in dash panel insert |
| J412 | Operating electronics control unit, telephone |
| R38 | Telephone microphone |
| T15 | 15-pin connector, black, in centre console |
| T18a | 18-pin connector, (VDA connector), on operating electronics control unit, telephone |
| T32b | 32-pin connector, grey, on dash panel insert |
| 60 | Earth point -2-, battery cover |
| 280 | Earth connection, in communication systems wiring harness |
| A19 | Connection (58s), in dash panel wiring harness (switch illumination) |
| A27 | Connection (speed signal), in dash panel wiring harness |
| V26 | Connection (speed signal), in navigation wiring harness |
| V36 | Connection (58), in radio wiring harness |
| * | Only models with multi-function steering wheel |
| J401 | Navigation system with CD drive control unit |
| J402 | Operating electronics control unit, navigation |
| J412 | Operating electronics control unit, telephone |
| R | Radio |
| R39 | Telephone/navigation systems loudspeaker |
| T6h | 6-pin connector, green, radio connector I - 2 |
| T8 | 8-pin connector, black, radio connector III |
| T8b | 8-pin connector, brown, radio connector II |
| T8m | 8-pin connector, blue, on navigation control unit |
| T10u | 10-pin connector, red, radio connector IV |
| T18a | 18-pin connector, (VDA connector), on operating electronics control unit, telephone |
| V27 | Connection (mute circuit), in navigation wiring harness |
| V34 | Connection (low frequency, NF+), in telephone wiring harness |
| V38 | Connection (muting), in telephone wiring harness |
| * | Models without navigation system |
| ** | Models with navigation system 'NS Low' |
| *** | Models with radio navigation system |
| # | Models without radio |
| ## | Models with radio Bose sound system |
| ### | Models with radio |
