| Number | X-pin, colour | Description |
|---|---|---|
| X608 | 5-pin, natural | Plug connector Heating and A/C control module |
| X610 | 18-pin, natural | Plug connector Heating and A/C control module |
| X613 | 3-pin, black | Plug connector Heating and A/C control module |
| X18341 | 6-pin, black | Plug connector Heating and A/C control module |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Signal Locator lighting | Connector, instrument and locator lighting |
| 2 | E | Terminal 15 | Fuse F28 |
| 3 | E | Signal, rear window defogger | Rear window defogger relay |
| 4 | E | Signal Water valves | Water valves |
| 5 | E | Signal, independent heating ON (DDE only) | Independent park heating control unit |
| 6 | Not used | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | A | Pressure sensor signal, air conditioning system | Pressure sensor, air conditioning system |
| 3 | Not used | ||
| 4 | Not used | ||
| 5 | Not used | ||
| 6 | Not used | ||
| 7 | A | Supply, A/C pressure sensor | Pressure sensor, air conditioning system |
| 8 | E/A | K-bus signal | Instrument cluster control unit |
| 9 | E | Terminal 30 | Relay, A/C compressor |
| 10 | A | Electronic ground, A/C pressure sensor | Pressure sensor, air conditioning system |
| 11 | M | AUC heater ground | AUC sensor |
| 12 | Not used | ||
| 13 | M | Ground | Ground point |
| 14 | M | Ground | Ground point |
| 15 | E | AUC sensor signal | AUC sensor |
| 16 | A | AUC sensor supply | AUC sensor |
| 17 | Not used | ||
| 18 | A | AUC heating supply | AUC sensor |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | RHD: | Ventilation flap motor Fresh air/recirculated air flap motor, right Fresh air/recirculated air flap motor, left Defroster flap motor Footwell flap motor |
| 2 | E | Stage 2 | Ventilation flap motor Fresh air/recirculated air flap motor, right Fresh air/recirculated air flap motor, left Defroster flap motor Footwell flap motor |
| 3 | E/A | Stage 3 | Ventilation flap motor Fresh air/recirculated air flap motor, right Fresh air/recirculated air flap motor, left Defroster flap motor Footwell flap motor |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | A | Voltage supply Blower | Blower output stage |
| 3 | E | Sensor ground, air conditioning system | Evaporator sensor |
| 4 | A | Evaporator temperature sensor | Evaporator sensor |
| 5 | E | Sensor ground, air conditioning system | Heat exchanger sensor |
| 6 | A | Left heat exchanger temperature sensor | Heat exchanger sensor |