Body Control Module (BCM) - C4

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	L-GN	80	Key In Ignition Switch Signal
A2	YE	307	Headlamp Switch Flash to Pass Signal
A3	WH	530	Off/Run/Crank Voltage
A4	PK	39	Ignition 1 Voltage
A5	-	-	Not Used
A6	D-BU/WH	149	Cargo Lamp Low Control (Avalanche/Escalade EXT)
A6	-	-	Not Used
A7	L-BU	1134	Park Brake Switch Signal
A8	GY	1524	Backup Lamp Signal
A9-A11	-	-	Not Used
A12	WH	103	Headlamp Switch Headlamps On Signal
B1-B2	-	-	Not Used
B3	YE	43	Accessory Voltage
B4-B5	-	-	Not Used
B6	GY/BK	2226	Instrument Panel Lamps Dimmer Switch Low Reference
B7	BK	279	Ambient Light Sensor Low Reference
B8	-	-	Not Used
B9	D-BU/WH	1495	Courtesy Lamps On Signal
B10-B12	-	-	Not Used