HVAC Control Unit Inputs and Outputs

CONNECTOR A

CONNECTOR A REFERENCE TABLE

Cavity	Wire color	Signal
1	BRN/WHT	REAR MODE HEAT	INPUT
2	BLK	REAR MODE VENT	INPUT
3	LT GRN	REAR WINDOW DEFOGGER RELAY	INPUT
4	RED	SENSOR COMMON GROUND	INPUT
6	PNK	FRONT MODE CONTROL MODE 1	OUTPUT
7	LT BLU	FRONT MODE CONTROL MODE 2	OUTPUT
8	BLU/BLK	FRONT MODE CONTROL MODE 3	OUTPUT
9	BLU	FRONT MODE CONTROL MODE 4	OUTPUT
10	GRN	REAR HVAC CONTROL PANEL (BUS DATA)	INPUT/OUTPUT
11	BLU	AUDIO-HVAC DISPLAY UNIT (SO)	OUTPUT
12	PUR	AUDIO-HVAC DISPLAY UNIT (CLK)	OUTPUT
13	RED/GRN	REAR BLOWER FEEDBACK	INPUT
14	GRY	COMMON POTENTIAL 5 V	OUTPUT
15	PUR	REAR AIR MIX POTENTIAL	INPUT
16	YEL	FRONT AIR MIX POTENTIAL	INPUT
17	GRY	RECIRCULATION CONTROL MODE 3	OUTPUT
18	BLK	RECIRCULATION CONTROL MODE 2	OUTPUT
19	WHT	RECIRCULATION CONTROL MODE 1	OUTPUT
20	LT GRN	A/C PRESSURE SENSOR	OUTPUT
21	PNK	OUTSIDE AIR TEMPERATURE SENSOR	OUTPUT
22	BRN	EVAPORATOR TEMPERATURE SENSOR	OUTPUT
23	WHT	B-CAN HI	INPUT/OUTPUT
24	LT GRN	B-CAN LO	INPUT/OUTPUT

Fig 1: Identifying HVAC Control Unit Connector A (24P) Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

CONNECTOR B

CONNECTOR B REFERENCE TABLE

Cavity	Wire color	Signal
1	RED/BLK	FRONT AIR MIX HOT	OUTPUT
2	GRN/WHT	FRONT MODE VENT	OUTPUT
3	GRN	FRONT MODE DEF	OUTPUT
4	BLK	GROUND (G403)	OUTPUT
5	YEL	FRESH	OUTPUT
6	BLU/ORN	RECIRCULATE	OUTPUT
7	GRY	REAR AIR MIX COOL	OUTPUT
8	PNK	REAR AIR MIX HOT	OUTPUT
9	ORN	FRONT AIR MIX COOL	OUTPUT
10	LT BLU	ILLUMINATION (+)	INPUT
11	BLU	REAR POWER TRANSISTOR CONTROL	OUTPUT
12	YEL	ILLUMINATION (-)	OUTPUT
13	RED	FRONT POWER TRANSISTOR CONTROL	OUTPUT
14	BLU	FRONT BLOWER FEEDBACK	INPUT
15	YEL	IG2 (Power)	INPUT

Fig 2: Identifying HVAC Control Unit Connector B (16P) Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.