Body Control Module (BCM) C4 Connector End View

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	PK	1390	Off/Run/Crank Voltage
A4	PK	39	Ignition 1 Voltage
A5	BK/WH	746	Right Front Door Ajar Switch Signal
A6	-	-	Not Used
A7	L-BU	1134	Park Brake Switch Signal
A8-A11	-	-	Not Used
A12	WH	103	Headlamp Switch HeadlampsOn Signal
B1-B2	-	-	Not Used
B3	YE	343	Accessory Voltage
B4	GY/BK	745	Left Front Door Ajar Switch Signal
B5	L-BU	195	Door Lock Control
B6	GY/BK	2226	Instrument Panel Lamps Dimmer Switch Low Reference
B7	BK	279	Ambient Light Sensor Low Reference
B8-B9	-	-	Not Used
B10	WH	194	Door Unlock Control
B11-B12	-	-	Not Used