Body Control Module (BCM) C2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15393121 72-Way F Micro-Pack 64 Series (GY)
Pin	Wire Color	Circuit No.	Function
1	TN/BK	2500	High Speed GMLAN Serial Data Bus +
2	TN/BK	2500	High Speed GMLAN Serial Data Bus +
3	PK/WH	1970	Headlamp Low Beam Relay Control
4	PU	524	Headlamp Dimmer Switch High Beam Signal
5	BN/WH	301	Park Lamp Switch Signal
6-8	-	-	Not Used
9	WH	111	Hazard Switch Signal
10	-	-	Not Used
11	D-GN	264	Security Indicator Supply Voltage
12	L-GN	377	Serial Data
13	BK/WH	651	Ground
14	TN	28	Horn Relay Control
15	WH	103	Headlamp Switch Headlamps On Signal
16	OG	192	Front Fog Lamp Switch Signal
17	PU/WH	549	Headlamp Switch Headlamps Off Signal
18	WH	5359	5-Volt Reference
19	TN	2501	High Speed GMLAN Serial Data Bus -
20	TN	2501	High Speed GMLAN Serial Data Bus -
21-25	-	-	Not Used
26	D-GN	44	Instrument Panel Lamps Dimmer Switch Signal
27-28	-	-	Not Used
29	L-GN	5980	Adjustable Pedal Inhibit Signal (JF4)
30	-	-	Not Used
31	YE	5361	Brake Pedal Position Sensor Signal
32	-	-	Not Used
33	YE	317	Fog Lamp Relay Control
34-36	-	-	Not Used
37	D-GN	5060	Low Speed GMLAN Serial Data
38	D-GN	5060	Low Speed GMLAN Serial Data
39-43	-	-	Not Used
44	L-GN/BK	1137	DRL Ambient Light Sensor Signal
45-46	-	-	Not Used
47	YE/BK	1138	DRL Ambient Light Sensor Low Reference
48-50	-	-	Not Used
51	BN	1356	Flash To Pass Switch Signal
52-54	-	-	Not Used
55	D-GN	5060	Low Speed GMLAN Serial Data
56	WH	1390	Off/Run/Crank Voltage
57	GY	112	Windshield Wiper Switch Signal 1
58	PU	719	Low Reference
59	BN	5360	Low Reference
60	-	-	Not Used
61	GY	1884	Cruise Control Switch Signal
62	WH/BK	1073	5-Volt Reference
63-65	-	-	Not Used
66	YE/BK	1418	Left Rear Turn Signal Switch Signal
67	D-GN/WH	1419	Right Rear Turn Signal Switch Signal
68	L-BU	292	Rear Defog Switch Signal
69	D-GN/WH	762	A/C Request Signal
70-71	-	-	Not Used
72	TN	683	Rear Defog Indicator Supply Voltage