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 (Body Type VIN 6)
A10	YE	2277	Auxiliary HVAC Enable Control
A11	D-GN	71	OFF Blower Motor Control
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	HVAC 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		15326924 8-Way F GT 280 (BK)
Pin	Wire Color	Circuit No.	Function
A	PU	73	Medium 3 Blower Motor Control
B	L-BU	72	Medium 2 Blower Motor Control
C	TN	63	Medium 1 Blower Motor Control
D	YE	60	Low Blower Motor Control
E	-	-	Not Used
F	OG	52	High Blower Motor Control
G	BN	141	Ignition 3 Voltage
H	D-GN	71	OFF Blower Motor Control