| G473 | Trailer coupling motor Hall sender |
| J345 | Trailer detector control unit |
| J519 | Onboard supply control unit |
| SC1 | Fuse 1 on fuse holder C, right |
| SC3 | Fuse 3 on fuse holder C, right |
| SC41 | Fuse 41 on fuse holder C, right |
| T5p | 5-pin connector, under bumper |
| T6cd | 6-pin connector, rear right |
| T12h | 12-pin connector |
| T13 | 13-pin connector |
| T16cd | 16-pin connector |
| U10 | Trailer socket |
| V317 | Hinged tow attachment ball head motor |
| 51 | Earth point, on right in luggage compartment |
| 396 | Earth connection 31, in main wiring harness |
| 398 | Earth connection 33, in main wiring harness |
| * | applies only to models with electrically foldable ball coupling |
| ** | only models from January 2004 |
| E474 | Electric hinged tow coupling attachment button, on left in luggage compartment |
| J345 | Trailer detector control unit, on right in luggage compartment |
| J393 | Convenience system central control unit, on right in luggage compartment |
| J519 | Onboard supply control unit |
| K211 | Extending tow ball coupling warning lamp |
| K212 | Retracting tow ball coupling warning lamp |
| L76 | Button illumination bulb |
| SC5 | Fuse 5 on fuse holder, right |
| T6av | 6-pin connector |
| T12g | 12-pin connector |
| T12h | 12-pin connector |
| T23 | 23-pin connector |
| 51 | Earth point, on right in luggage compartment |
| 369 | Earth connection 4, in main wiring harness |
| 372 | Earth connection 7, in main wiring harness |
| B336 | Connection 2 (54), in main wiring harness |
| B404 | Connection 8 (convenience CAN bus, high), in main wiring harness |
| B413 | Connection 8 (convenience CAN bus, low), in main wiring harness |
| W20 | Positive connection (30a), in rear wiring harness |
| * | applies only to models with electrically foldable ball coupling |
| J285 | Control unit in dash panel insert |
| J519 | Onboard supply control unit |
| J533 | Data bus diagnostic interface |
| T16b | 16-pin connector, diagnosis connection, under left dash panel |
| T26a | 26-pin connector |
| T32b | 32-pin connector, green |
| B397 | Connection 1 (convenience CAN bus, high), in main wiring harness |
| B402 | Connection 6 (convenience CAN bus, high), in main wiring harness |
| B403 | Connection 7 (convenience CAN bus, high), in main wiring harness |
| B405 | Connection 9 (convenience CAN bus, high), in main wiring harness |
| B406 | Connection 1 (convenience CAN bus, low), in main wiring harness |
| B411 | Connection 6 (convenience CAN bus, low), in main wiring harness |
| B412 | Connection 7 (convenience CAN bus, low), in main wiring harness |
| B414 | Connection 9 (convenience CAN bus, low), in main wiring harness |
| F | Brake light switch |
| J104 | ABS control unit |
| J419 | Brake light additional relay |
| SB26 | Fuse 26 on fuse holder B left |
| SB38 | Fuse 38 on fuse holder B left |
| T47b | 47-pin connector |
| 32 | Earth point, on left behind dash panel insert |
| 370 | Earth connection 5, in main wiring harness |
| 385 | Earth connection 20, in main wiring harness |
| B278 | Positive connection 2 (15a), in main wiring harness |
| B289 | Positive connection 13 (15a), in main wiring harness |
| B335 | Connection 1 (54), in main wiring harness |
| ** | only models from January 2004 |
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