Powertrain Control Module (PCM) C1 (NU3) Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15460473 56-Way F Micro-Pack/064 Series (BU)
Pin	Wire Color	Circuit No.	Function
1-3	-	-	Not Used
4	GY	2700	5-Volt Reference
5	-	-	Not Used
6	BN/WH	419	MIL Control
7	BK	2751	Low Reference
8	BK	2759	Low Reference
9	-	-	Not Used
10	WH	1310	EVAP Canister Vent Solenoid Control
11	-	-	Not Used
12	BK	476	Low Reference
13-14	-	-	Not Used
15	D-GN	1049	PCM Class 2 Serial Data
16-17	-	-	Not Used
18	BN	1141	Ignition 3 Voltage
19	PK	439	Ignition 1 Voltage
20	OG	540	Battery Positive Voltage
21	WH	121	Engine Speed Signal (ABS)
22	D-GN	389	Vehicle Speed Signal
23	YE/BK	625	Starter Enable Relay Control
24	BN	5069	Powertrain Relay Control
25	-	-	Not Used
26	D-GN	890	Fuel Tank Pressure Sensor Signal
27-30	-	-	Not Used
31	RD/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	BN	436	Air Pump Relay Control
35-36	-	-	Not Used
37	D-GN/WH	465	Fuel Pump Relay Control
38-42	-	-	Not Used
43	PU	1589	Fuel Level Sensor Signal
44	GY	1884	Cruise Control Switch Signal
45-47	-	-	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	2709	5-Volt Reference
54-56	-	-	Not Used