Automatic climate control (IHKA)
Scheme 6450.0

A=X610	26-pin, white B=X611 26-pin, green
C=X613	26-pin, blue
D=X614	26-pin, yellow

Pin Assignment X610

Pin	Type	Description/Function	Connection
1	A	Signal, rear compartment	Rear actuator motor
2	A	Signal, rear compartment	Rear actuator motor
3	A	Signal, rear compartment	Rear actuator motor
4	A	Signal, rear compartment	Rear actuator motor
5	A	Blower ON	Blower output stage
6	A	Signal, air conditioning ON	A/C relay
7	A	Signal, rear window defogger ON	Rear window defogger relay
8	A	Signal, compressor ON	Pressure switch B8y
9		not used
10		not used
11		not used
12	E	Terminal 30	Fuse
13	E	Terminal 30	Fuse
14	A	Signal, recirculated air	Recirculated air flap motor
15	A	Signal, recirculated air	Recirculated air flap motor
16	A	Signal, recirculated air	Recirculated air flap motor
17	A	Signal, recirculated air	Recirculated air flap motor
18	A	Activation, lights	IHKA operating unit
19	A	Activation, rear window defogger lights	IHKA operating unit
20	E/A	TxD diagnosis line	Diagnostic connector
21	A	Activation, left water valve	Left water valve
22	A	Activation, auxiliary water pump	Auxiliary water pump relay
23	A	Activation, right water valve	Right water valve
24		not used
25	E	Terminal 30	Fuse
26	E	Terminal 30	Fuse

Pin Assignment X611

Pin	Type	Description/Function	Connection
1	A	Signal, left footwell	Left footwell actuator motor
2	A	Signal, left air mixing	Mixing air flap motor, left
3	A	Signal, left air mixing	Mixing air flap motor, left
4	A	Signal, left air mixing	Mixing air flap motor, left
5	A	Signal, left air mixing	Mixing air flap motor, left
6	A	Activation, fresh air	Fresh air flap motor
7	A	Activation, fresh air	Fresh air flap motor
8	A	Activation, fresh air	Fresh air flap motor
9	A	Activation, fresh air	Fresh air flap motor
10		not used
11		not used
12		not used
13		not used
14	A	Signal, left footwell	Left footwell actuator motor
15	A	Signal, left footwell	Left footwell actuator motor
16	A	Signal, left footwell	Left footwell actuator motor
17	A	Signal, defrost	Defroster flap motor
18	A	Signal, defrost	Defroster flap motor
19	A	Signal, defrost	Defroster flap motor
20	A	Signal, defrost	Defroster flap motor
21	A	Signal, left-hand ventilation	Ventilation flap motor
22	A	Signal, left-hand ventilation	Ventilation flap motor
23	A	Signal, left-hand ventilation	Ventilation flap motor
24	A	Signal, left-hand ventilation	Ventilation flap motor
25		not used
26		not used

Pin Assignment X613

Pin	Type	Description/Function	Connection
1	M	Ground	Ground connection
2	M	Ground	Ground connection
3		not used
4	A	Setpoint, left-hand temperature	IHKA operating unit
5	A	Setpoint, blower	IHKA operating unit
6	A	Interior sensor blower motor	Interior sensor blower motor
7	E	Outside temperature	Outside temperature sensor
8	A	Setpoint, right-hand temperature	IHKA operating unit
9	E	Evaporator temperature	Evaporator sensor
10	A	Voltage supply of actuator motors	All actuator motors
11	A	Voltage supply of actuator motors	All actuator motors
12	E	Terminal 15	Fuse
13	E	Terminal 15	Fuse
14	M	Ground	Ground connection
15	M	Ground	Ground connection
16	M	Ground for all sensors	All temperature sensors
17	A	Setpoint, mixing air	Mixing air actuator
18	E	Left heat exchanger temperature	Left heat exchanger sensor
19	E	Terminal 30 h	Alternator
20	M	Ground for potentiometer	IHKA operating unit, mixing air control
21	E	Interior temperature	IHKA operating unit
22	E	Right heat exchanger temperature	Heat exchanger sensor
23	A	Voltage supply of actuator motors	All actuator motors
24	A	Voltage supply of actuator motors	All actuator motors
25	E	Terminal 15	Fuse
26	E	Terminal 15	Fuse

Pin Assignment X614

Pin	Type	Description/Function	Connection
1	A	Signal, right footwell	Right footwell actuator motor
2	A	Signal, right footwell	Right footwell actuator motor
3	A	Signal, right footwell	Right footwell actuator motor
4	A	Signal, right footwell	Right footwell actuator motor
5	E	Signal, recirculated air	IHKA operating unit
6	E	Signal, defrost	IHKA operating unit
7	E	Signal, rear window defogger	IHKA operating unit
8	E	Signal, normal program	IHKA operating unit
9	E	Speedometer A signal	Instrument cluster
10	A	RxD diagnosis line	Diagnostic connector
11	A	Voltage supply for defrost/ independent heating	IHKA operating unit
12	A	Voltage supply, interior ventilation/ recirculated air/independent heating	IHKA operating unit
13	A	Voltage supply footwell/recirculated air/ rear window defogger	IHKA operating unit
14	A	Signal, right-hand ventilation	Right ventilation flap motor
15	A	Signal, right-hand ventilation	Right ventilation flap motor
16	A	Signal, right-hand ventilation	Right ventilation flap motor
17	A	Signal, right-hand ventilation	Right ventilation flap motor
18	A	Signal, right air mixing	Mixing air flap motor, right
19	A	Signal, right air mixing	Mixing air flap motor, right
20	A	Signal, right air mixing	Mixing air flap motor, right
21	A	Signal, right air mixing	Mixing air flap motor, right
22		not used
23		not used
24		not used
25		not used
26		not used

E = Input, A = Output, M = Ground