| Number | X-pin, color | Description |
|---|---|---|
| X610 | 18-pin, natural | Plug connector Heating/air conditioning system |
| X18341 | 6-pin, black | Plug connector Heating/air conditioning system |
| X608 | 6-pin, natural | Plug connector Heating/air conditioning system |
| X18348 | 3-pin, natural | Plug connector Heating/air conditioning system |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not occupied | ||
| 2 | E | Pressure sensor signal, air conditioning system | Coolant pressure sensor |
| 3 | Not occupied | ||
| 4 | Not occupied | ||
| 5 | Not occupied | ||
| 6 | Not occupied | ||
| 7 | A | Supply, A/C pressure sensor | Coolant pressure sensor |
| 8 | E/A | K-bus signal | K-bus connector |
| 9 | E | Terminal 30 | Fuse F63 |
| 10 | M | Ground | Coolant pressure sensor |
| 11 | Not occupied | ||
| 12 | Not occupied | ||
| 13 | M | Ground | Ground connector |
| 14 | M | Ground | Ground connector |
| 15 | Not occupied | ||
| 16 | Not occupied | ||
| 17 | Not occupied | ||
| 18 | Not occupied | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | M | Signal, air distribution microswitch | Microswitch, air distribution |
| 2 | A | Blower control voltage | Blower output stage |
| 3 | E | Evaporator temperature sensor | Evaporator temperature sensor |
| 4 | M | Sensor ground, air conditioning system | Evaporator temperature sensor |
| 5 | M | Sensor ground, air conditioning system | Mixed air temperature sensor |
| 6 | E | Signal, mixed air temperature sensor | Mixed air temperature sensor |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Terminal 58g | Light switch cluster |
| 2 | E | Terminal 15 | Fuse F28 |
| 3 | A | Signal, rear-window defroster | Rear window defroster relay |
| 4 | A | Signal, water valve | Water valve |
| 5 | A | Signal, electric auxiliary heater | Electric auxiliary heater |
| 6 | A | Signal, auxiliary water pump | Auxiliary water pump |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Supply, MI-bus motors | Stepper motors |
| 2 | M | Ground, MI-bus motors | Stepper motors |
| 3 | E/A | MI-bus | Stepper motors |