Kia Rio: Heater & A/C Control Unit (MANUAL) Components

Connector pin function

Connector	Pin No	Function	Connector	Pin No	Function
A	1	Ground	B	18	Intake Actuator Feedback
	2	Middle High		19	Temperature Actuator Feedback
	3	Middle Low		20	Vref (5V)
	4	High		21	-
	5	Low		22	-
	6	-		23	Rear Defrost Switch (Low)
B	1	Mode Actuator (Vent)		24	HTD (Rear Defrost Indicator)
	2	Mode Actuator (Defog)		25	Detent Out (+)
	3	Intake Actuator (Fresh)		26	-
	4	Intake Actuator (Recirculation)		27	Evaporator Temperature Sensor
	5	Temperature Actuator (Cool)		28	Ambient Temperature Sensor
	6	Temperature Actuator (Warm)		29	-
	7	PTC On Signal		30	-
	8	PTC Relay #2		31	ECV IN
	9	PTC Relay #3		32	ECV OUT
	10	Seat Warmer Signal (Low) - Driver	C	1	IGN 2
	11	Seat Warmer Signal (High) - Driver		2	Rheostat (ILL-)
	12	-		3	Sensor Ground
	13	CAN (Low)		4	Battery (+)
	14	CAN (High)		5	Tail Lamp (+)
	15	Blower Feedback		6	Blower Common Signal (-)
	16	Ground		7	IGN 1
	17	Mode Actuator Feedback		8	Ground

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