HVAC Control Module Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110088 24-Way F Micro-Pack 100 Series (GY)
Pin	Wire Color	Circuit No.	Function
A1	RD/WH	440	Battery Positive Voltage
A2	-	-	Not Used
A3	BN	141	Ignition 3 Voltage
A4	-	-	Not Used
A5	D-GN	5060	Low Speed GMLAN Serial Data
A6	D-GN	5060	Low Speed GMLAN Serial Data
A7	GY/BK	754	Blower Speed Request Signal
A8	BN	404	Upper Air Temperature Sensor Signal
A9	L-GN	405	Lower Air Temperature Sensor Signal
A10	L-GN/BK	1647	Recirculation Door Control A
A11	TN	2273	Mode Door Control A
A12	D-BU	1199	Air Temperature Door Control A
B1-B2	-	-	Not Used
B3	GY	8	Instrument Panel Lamp Supply Voltage
B4	-	-	Not Used
B5	BK/WH	651	Ground
B6-B7	-	-	Not Used
B8	TN	470	Low Reference
B9	TN	476	Low Reference
B10	PK/WH	1648	Recirculation Door Control B
B11	L-GN	2275	Mode Door control B
B12	YE	1791	Air Temperature Door Control B