Powertrain Control Module (PCM) C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15430208 56-Way F Micro-Pack 64 Series Sealed (BU)
Pin	Wire Color	Circuit No.	Function
1	TN/BK	2500	High Speed GMLAN Serial Data Bus +
2	TN	2501	High Speed GMLAN Serial Data Bus -
3	-	-	Not Used
4	GY	2700	5-Volt Reference
5	-	-	Not Used
6	BN/WH	419	MIL Control
7	TN	5514	Low Reference
8	OG/BK	1057	Low Reference
9	-	-	Not Used
10	WH	1310	EVAP Canister Vent Solenoid Control
11	-	-	Not Used
12	OG/BK	1057	Low Reference
13-14	-	-	Not Used
15	PU	1807	Class 2 Serial Data
16-17	-	-	Not Used
18	BN	4	Accessory Voltage
19	PK	639	Ignition 1 Voltage
20	RD/WH	540	Battery Positive Voltage
21	-	-	Not Used
22	BN	818	Vehicle Speed Signal
23	YE	447	Starter Relay Coil Control
24	BN	5069	Main Relay Control
25	-	-	Not Used
26	D-GN	890	Fuel Tank Pressure Sensor Signal
27-30	-	-	Not Used
31	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
32	WH	17	Stop Lamp Switch Signal
33	D-GN/WH	459	A/C Compressor Clutch Relay Control
34-36	-	-	Not Used
37	D-GN/WH	465	Fuel Pump Relay Control
38-42	-	-	Not Used
43	PU	1589	Fuel Level Sensor Signal
44	-	-	Not Used
45	PU	5526	Tap Up/Tap Down Switch Signal
46-47	-	-	Not Used
48	D-GN	335	Low Speed Cooling Fan Relay Control
49	-	-	Not Used
50	D-BU	473	High Speed Cooling Fan Relay Control
51-52	-	-	Not Used
53	GY	705	5-Volt Reference A
54-56	-	-	Not Used