| Number | X-pin, colour | Description |
|---|---|---|
| X610 | 26-pin, blue | Plug connector Heating/air conditioning system |
| X4714 | 18-pin, blue | Plug connector Heating/air conditioning system |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Terminal 30 | Fuse F39 |
| 2 | E | Terminal 15 | Fuse F22 |
| 3 | E | Terminal 58g | Light switch cluster |
| 4 | M | Ground | Ground connector |
| 5 | Not used | ||
| 6 | A | Signal, auxiliary water pump Not M54 | Auxiliary water pump |
| 7 | Not used | ||
| 8 | A | Compressor control | Control valve, refrigerant compressor |
| 9 | E/A | K-bus signal | K-bus connector |
| 10 | Not used | ||
| 11 | Not used | ||
| 12 | Not used | ||
| 13 | A | Signal, rear window defogger | Rear defogger relay |
| 14 | A | Signal, rear window defogger | Rear defogger relay |
| 15 | E | Compressor enable from DME | DME control unit |
| 16 | A | Supply, A/C pressure sensor | Coolant pressure sensor |
| 17 | E | Pressure sensor signal, air conditioning system | Coolant pressure sensor |
| 18 | M | Ground | Coolant pressure sensor |
| 19 | A | AUC heating supply | AUC sensor |
| 20 | A | AUC sensor supply | AUC sensor |
| 21 | E | AUC sensor signal | AUC sensor |
| 22 | M | AUC heater ground | AUC sensor |
| 23 | Not used | ||
| 24 | Not used | ||
| 25 | Not used | ||
| 26 | Not used | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Supply, MI-bus motors | Stepper motors |
| 2 | E | Ground, MI-bus motors | Stepper motors |
| 3 | E/A | MI-bus | Stepper motors |
| 4 | A | Blower control voltage | Blower output stage |
| 5 | E | Evaporator temperature sensor | Evaporator temperature sensor |
| 6 | M | Sensor ground, air conditioning system | Evaporator temperature sensor |
| 7 | E | Bi-directional data interface | Mixed air temperature sensor |
| 8 | M | Sensor ground, air conditioning system | Mixed air temperature sensor |
| 9 | Not used | ||
| 10 | Not used | ||
| 11 | Not used | ||
| 12 | Not used | ||
| 13 | A | Signal, fresh air/recirculating air flap actuator | Fresh air/recirculating air flap motor |
| 14 | M | Ground signal, fresh air/recirculating air flap actuator | Fresh air/recirculating air flap motor |
| 15 | A | Signal, fresh air/recirculating air flap actuator | Fresh air/recirculating air flap motor |
| 16 | M | Ground signal, fresh air/recirculating air flap actuator | Fresh air/recirculating air flap motor |
| 17 | Not used | ||
| 18 | Not used | ||