| J255 | Climatronic control unit |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface |
| K | Dash panel insert |
| T16a | 16-pin connector, under the glove compartment on the driver's side (diagnostic connection) |
| T20a | 20-pin connector, at Climatronic control unit (red) |
| T32a | 32-pin connector, at dash panel insert (blue) |
| T32b | 32-pin connector, at dash panel insert (green) |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A146 | Connection (CAN H, convenience), in dash panel wiring harness |
| A147 | Connection (CAN L, convenience), in dash panel wiring harness |
| J453 | Multi-function steering wheel control unit |
| J503 | Radio navigation system control unit |
| J559 | Traffic information control unit, behind dash panel |
| R | Radio |
| T8d | 8-pin connector, at radio (black) |
| T10h | 10-pin connector, on the radio navigation system control unit (red) |
| T12f | 12-pin connector, at traffic information control unit |
| T20b | 20-pin connector, at radio |
| A146 | Connection (CAN H, convenience), in dash panel wiring harness |
| A147 | Connection (CAN L, convenience), in dash panel wiring harness |
| * | only for vehicles with radio navigation system with black/ white display |
| J412 | Operating electronics control unit/telephone (interface box) |
| R12 | Amplifier, under rear shelf |
| T10e | 10-pin connector, on left A-pillar (brown) |
| T10f | 10-pin connector, behind radio (Taxi preparation) |
| T18c | 18-pin connector, at operating electronics control unit/telephone (interface box) |
| T23b | 23-pin connector, at amplifier |
| A146 | Connection (CAN H, convenience), in dash panel wiring harness |
| A147 | Connection (CAN L, convenience), in dash panel wiring harness |
| W64 | Connection (CAN H, convenience), in floor wiring harness |
| W65 | Connection (CAN L, convenience), in floor wiring harness |
| J136 | Seat adjustment control unit with memory, under the driver seat |
| J386 | Door control unit, driver side |
| J393 | Convenience electric central control unit, in front left footwell |
| T10b | 10-pin connector, in the holder under the driver seat (brown) |
| T10t | 10-pin connector, on left A-pillar (grey) |
| T10v | 10-pin connector, on left A-pillar (black) |
| T23a | 23-pin connector, on the convenience electric central control unit |
| T28a | 28-pin connector, at seat adjustment control unit with memory |
| T29a | 29-pin connector, at door control unit, driver side |
| W64 | Connection (CAN H, convenience), in floor wiring harness |
| W65 | Connection (CAN L, convenience), in floor wiring harness |
| J387 | Door control unit, front passenger side |
| J388 | Door control unit, rear left |
| J389 | Door control unit, rear right |
| T8h | 8-pin connector, on left B-pillar (black) |
| T8j | 8-pin connector, on right B-pillar (black) |
| T10x | 10-pin connector, on right A-pillar (black) |
| T18a | 18-pin connector, at door control unit, rear left |
| T18b | 18-pin connector, at door control unit, rear right |
| T29b | 29-pin connector, at door control unit, front passenger side |
| W64 | Connection (CAN H, convenience), in floor wiring harness |
| W65 | Connection (CAN L, convenience), in floor wiring harness |
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