| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | A | Signal, terminal 30G | Relay, terminal 30G |
| | | |
| 2 | A | Signal, terminal R | Brake light switch |
| | | |
| 3 | E | Signal Clutch switch module | Clutch switch module |
| | | |
| 4 | A | Signal, terminal R | Passenger's seat occupancy detection |
| | | |
| 5 | A | Supply Crash safety module | Crash safety module |
| | | |
| 6 | A | SMG transmission Start signal | Sequential manual transmission (SMG) |
| | | |
| 7 | A | Signal, terminal 15 | Relay, fuel injectors M54 engine |
| | | |
| 8 | A | Signal, terminal 15 | Relay, terminal 15 |
| | | |
| 9 | A | diesel engine Signal, terminal 15 | Fuel heater |
| | | |
| 10 | A | Signal, terminal 15 | Convertible top module |
| | | |
| 11 | E | Signal, selector lever interlock sensor | Gear indicator lighting |
| | | |
| 12 | M | Ground | Ground point |
| | | |
| 13 | A | Signal, terminal 15 | OBDII socket |
| | | |
| 14 | A | Signal, terminal 15 | Steering column switch cluster |
| | | |
| 15 | | Not used | |
| | | |
| 16 | | Not used | |
| | | |
| 17 | | Not used | |
| | | |
| 18 | A | Wake-up signal, terminal 15 | Active cruise control |
| | | |
| 19 | A | Wake-up signal, terminal 15 | Connector , terminal 15 wake-up signal |
| | | |
| 20 | A | Signal, electronic vehicle immobilizer | DME control unit Digital diesel electronics control unit |
| | | |
| 21 | E | Supply | Fuse F7 |
| | | |
| 22 | A | Signal, starter terminal 50 | Starter |
| | | |
| 23 | A | Voltage supply Electric steering column adjustment | Electric steering column adjustment |
| | | |
| 24 | M | Ground Electric steering column adjustment | Electric steering column adjustment |
| | | |
| 25 | M | Ground | Ground connector |
| | | |
| 26 | A/E | CAN bus low | CAN-bus connector |
| | | |
| 27 | | Not used | |
| | | |
| 28 | A | Signal, engine start | DME control unit Digital diesel electronics control unit |
| | | |
| 29 | E | Signal, centre lock | Hazard warning/central locking switch |
| | | |
| 30 | A/E | PA bus signal | PA bus connector |
| | | |
| 31 | E | Signal, rear left wheel speed | Dynamic stability control (DSC) |
| | | |
| 32 | E | Brake light switch signal | Brake light switch |
| | | |
| 33 | E | Signal, remote control services | Aerial tuner with remote control receiver |
| | | |
| 34 | E | Supply | Fuse F15 |
| | | |
| 35 | A/E | CAN bus high | CAN-bus connector |
| | | |
| 36 | | Not used | |
| | | |
| 37 | A | Telephone ON signal | TCU |
| | | |
| 38 | E | Signal, front lid contact | Bonnet contact |
| | | |
| 39 | E | Rear lid open signal | Rear lid release switch (interior) |
| | | |
| 40 | E | Signal, hotel switch | Switch, boot lid/tailgate lock |
| | | |
| 41 | E | Signal, parked position | Transmission control |
| | | |