| Number | X-pin, colour | Description |
|---|---|---|
| X610 | 26-pin, blue | Plug connector 3 Heating and A/C control module |
| X611 | 12-pin, natural | Plug connector 4 Heating and A/C control module |
| X18153 | 6-pin, black | Plug connector 5 Heating and A/C control module |
| X18341 | 3-pin, black | Plug connector 0 Heating and A/C control module |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Voltage supply, terminal 15 | Fuse F34 |
| 2 | Not used | ||
| 3 | E/A | K-bus signal line | K-bus connector |
| 4 | E | Signal, switch off consumer load | Connector, switch off consumer load |
| 5 | A | Left water valve activation | Water valves, Left valve |
| 6 | Not used | ||
| 7 | A | Relay activation Rear defogger relay | Rear defogger relay |
| 8 | A | Supply Heated windscreen washer jets | Heated windscreen washer jets |
| 9 | A | Auxiliary water pump activation with independent heating Auxiliary water pump activation with latent heat accumulator | Auxiliary water pump with independent heating Connector, auxiliary water pump with latent heat accumulator |
| 10 | A | Activation Pressure sensor | B8 High pressure switch |
| 11 | Not used | ||
| 12 | Not used | ||
| 13 | Not used | ||
| 14 | Not used | ||
| 15 | Not used | ||
| 16 | Not used | ||
| 17 | E | Signal, A/C compressor relay | DME control unit DDE control unit |
| 18 | Not used | ||
| 19 | Not used | ||
| 20 | E | Signal Pressure sensor | Pressure sensor |
| 21 | A | Sensor positive supply 5 V stabilized | Pressure sensor |
| 22 | Not used | ||
| 23 | E | Night light signal | Connector, terminal 58g |
| 24 | Not used | ||
| 25 | Not used | ||
| 26 | Not used | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Sensor signal | Left heat exchanger sensor |
| 2 | A | Sensor signal | Right heat exchanger sensor |
| 3 | A | Sensor signal | Evaporator sensor |
| 4 | A | Signal Output stage | Output stage |
| 5 | Not used | ||
| 6 | E | Sensor signal | Sensor connector |
| 7 | E | Actuating signal Fresh air flap motor | Fresh air flap motor |
| 8 | A | Actuating signal Fresh air flap motor | Fresh air flap motor |
| 9 | A | Actuating signal Fresh air flap motor | Fresh air flap motor |
| 10 | E | Actuating signal Fresh air flap motor | Fresh air flap motor |
| 11 | Not used | ||
| 12 | Not used | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | A | Independent park heating check valve | Solenoid valve independent heating/ventilation II |
| 3 | Not used | ||
| 4 | Not used | ||
| 5 | Not used | ||
| 6 | Not used | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Voltage supply, terminal 30 for throttle actuator | Fuse F48 |
| 2 | A | Positive supply, magnetic clutch | Y2 Solenoid clutch |
| 3 | M | Ground | Ground point |