A11 Heating and A/C control module

Plug connector overview

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
X613	3-pin, natural	Plug connector 2 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 F20

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	A	Right water valve activation	Water valves, Right valve

7	A	Relay activation Rear defogger relay	Rear defogger relay

8	A	Signal Heated windscreen washer jets	Connector, heated 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	E	Pressure signal	High pressure switch

11		Not used

12	E	Signal input	AUC sensor

13	A	Positive activation	AUC sensor

14		Not used

15	A	Air conditioning system standby signal	DDE control unit

16	A	Signal, A/C compressor ON (M51)	DDE control unit

17	A	Signal, A/C compressor OFF (M51) A/C compressor signal	DDE control unit DME control unit Digital diesel electronics control unit

18	E	Relay activation, auxiliary fan stage I	Connector, auxiliary fan stage 1

19		Not used

20	M	Ground High pressure switch	High pressure switch

21	A	Supply High pressure switch	High pressure switch

22	A	Shut-down signal with latent heat accumulator:	Connector, auxiliary water pump with latent heat accumulator:

23	E	Night light signal	Connector, terminal 58g

24		Not used

25	M	Ground AUC sensor, heating	AUC sensor

26	A	Positive activation AUC sensor, heating	AUC sensor

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	A	Signal Rear mixing air actuator	Rear mixing air actuator

6	M	Sensor ground	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	A	Signal Rear mixing air actuator	Rear mixing air actuator

12		Not used

Pin	Type	Description / Signal type	Connection / Measuring notes
1	A	Positive activation	Footwell/rear compartment actuator motor

2	E	Ground, actuator motors	Footwell/rear compartment actuator motor

3	E/A	MI-bus	Footwell/rear compartment actuator motor

Pin	Type	Description / Signal type	Connection / Measuring notes
1	A	Relay activation Relay for latent heat accumulator	Relay for latent heat accumulator

2	A	Signal, independent heating ON, Valve activation Changeover valve LWS	Solenoid valve independent heating/ventilation II, Changeover valve LWS

3	A	Independent heating ON feedback	Independent park/auxiliary heating

4	A	Sensor signal	NTC resistor, steering angle sensor

5	M	Sensor ground	NTC resistor, steering angle sensor

6	A	Valve activation Shut-off valve LWS	Shut-off valve LWS

Pin	Type	Description / Signal type	Connection / Measuring notes
1	E	Voltage supply, terminal 30 for throttle actuator	Fuse F9

2	A	Positive supply, magnetic clutch	High pressure switch (M51) Heating and A/C control module

3	M	Ground	Ground connector X219