| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | E | Voltage supply, terminal 15 | Fuse F20 |
| | | |
| 2 | A | Signal, A/C compressor OFF (M51) A/C compressor signal | DDE control unit DME control unit Digital diesel electronics control unit |
| | | |
| 3 | A | Signal, A/C compressor ON (M51) | DDE control unit |
| | | |
| 4 | A | Air conditioning system standby signal | DDE control unit |
| | | |
| 5 | A | Relay activation, rear window defogger | Rear defogger relay |
| | | |
| 6 | A | Relay activation, windscreen/spray jet heating | Heated front screen/washer jets relay |
| | | |
| 7 | E | Pressure signal | High pressure switch |
| | | |
| 8 | A | Blower control voltage | Output stage |
| | | |
| 9 | | Not used | |
| | | |
| 10 | M | Component ground, AUC heating | AUC sensor |
| | | |
| 11 | M | Ground High pressure switch | High pressure switch |
| | | |
| 12 | E | Signal, switch off consumer load | General module |
| | | |
| 13 | | Not used | |
| | | |
| 14 | A | Auxiliary water pump activation | Auxiliary water pump |
| | | |
| 15 | A | Relay activation, blower unloader relay | Heating blower relay |
| | | |
| 16 | | Not used | |
| | | |
| 17 | A | Relay activation, auxiliary fan stage I | Auxiliary fan stage 1 relay |
| | | |
| 18 | E | Night light signal | Connector, terminal 58g |
| | | |
| 19 | E/A | K-bus signal line | K-bus connector |
| | | |
| 20 | A | Left water valve activation | Water valves, Left valve |
| | | |
| 21 | A | Right water valve activation | Water valves, Right valve |
| | | |
| 22 | A | Supply High pressure switch | High pressure switch |
| | | |
| 23 | A | Sensor positive supply | AUC sensor |
| | | |
| 24 | E | Negative activation | AUC sensor |
| | | |
| 25 | A | Positive supply, AUC heating | AUC sensor |
| | | |
| 26 | | Not used | |
| | | |
| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | E | Actuating signal | Fresh air flap motor |
| | | |
| 2 | A | Actuating signal | Fresh air flap motor |
| | | |
| 3 | A | Actuating signal | Fresh air flap motor |
| | | |
| 4 | E | Actuating signal | Fresh air flap motor |
| | | |
| 5 | E | Setpoint, mixing air actuator | Rear mixing air actuator |
| | | |
| 6 | A | Sensors (+) | Temperature distribution potentiometer, Rear mixing air actuator |
| | | |
| 7 | E | Setpoint, mixing air actuator | Temperature distribution potentiometer |
| | | |
| 8 | E | Sensor signal | Right ventilation sensor |
| | | |
| 9 | E | Sensor signal | Left ventilation sensor |
| | | |
| 10 | E | Signal, ventilation ON | Rear passenger compartment ventilation switch |
| | | |
| 11 | E | Signal input | Solar sensor with DWA LED |
| | | |
| 12 | E | Signal input | Solar sensor with DWA LED |
| | | |
| 13 | A | Component supply | Solar sensor with DWA LED |
| | | |
| 14 | M | Component ground | Sensor and actuator |
| | | |
| 15 | E | Sensor signal | Evaporator sensor |
| | | |
| 16 | E | Sensor signal | Right heat exchanger sensor |
| | | |
| 17 | E | Sensor signal | Left heat exchanger sensor |
| | | |
| 18 | M | Component ground | Solar sensor with DWA LED |
| | | |