HVAC Control Module Connector End View

HVAC Control Module C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110206 24-Way F Micro-Pack 100 Series (L-BU)
Pin	Wire Color	Circuit No.	Function
A1	D-GN	1614	Recirculation Door Control
A2	D-BU	1646	Right Air Temperature Door Position Signal
A3	L-BU	733	Left Air Temperature Door Position Signal
A4	L-GN/BK	2276	Defrost Door Position Signal
A5	L-GN	2275	Mode Door Position Signal
A6	-	-	Not Used
A7	BN/WH	230	Instrument Panel Lamps Dimming Control
A8	BK/WH	751	Ground
A9	GY/BK	1596	Coolant Bypass Solenoid Control (Long Wheelbase)
A10-A11	-	-	Not Used
A12	D-BU	204	A/C Low Pressure Sensor Signal
B1	WH/BK	1236	Right Air Temperature Door Control
B2	D-BU	1199	Left Air Temperature Door Control
B3	TN/BK	2274	Defrost Door Control
B4	TN	2273	Mode Door Control
B5	BN	341	Ignition 3 Voltage
B6	YE	1791	Low Reference
B7	OG	4340	Battery Positive Voltage
B8	L-BU/BK	1688	5 Volt Reference
B9	BK	2250	Ground
B10	-	-	Not Used
B11	WH	1038	Class 2 Serial Data
B12	L-GN	2278	A/C Compressor Status Signal

HVAC Control Module C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15336594 12-Way F Micro Pack 100 (L-GY)
Pin	Wire Color	Circuit No.	Function
A	D-GN	734	Inside Air Temperature Sensor Signal
B	L-GN/BK	735	Ambient Air Temperature Sensor Signal
C	WH	2338	Upper Left Air Temperature Sensor Signal
D	GY	2336	Upper Right Air Temperature Sensor Signal
E	WH/BK	2339	Lower Left Air Temperature Sensor Signal
F	GY/BK	2337	Lower Right Air Temperature Sensor Signal
G	PU	1838	Recirculation Door Position Signal
H-J	-	-	Not Used
K	BN	718	Low Reference
L	WH/BK	1236	Inside Air Temperature Sensor Control
M	PU/WH	760	Blower Motor Speed Control