Powertrain Control Module (PCM) C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		80-Way Connector (BLU) Body - 12160549 TPA - 1216056A Terminals - 12084913 Shield - 12160921
Pin	Wire Color	Circuit No.	Function
1	BLK	808	Low Reference
2-3	-	-	Not Used
4	LT GRN	1222	1-2 Shift Solenoid Valve Control
5	DK BLU	473	High Speed Cooling Fan Relay Control
6	DK GRN	335	Low Speed Cooling Fan Relay Control
7	BLK	630	Camshaft Position Signal
8	PPL/WHT	430	Low Resolution Engine Speed Signal
9	LT BLU/BLK	647	Medium Resolution Engine Speed Signal
10	GRY	605	5-Volt Reference
11	-	-	Not Used
12	TAN	413	HO2S Low Reference
13	ORN/BLK	469	Low Reference
14-15	-	-	Not Used
16	BLK/WHT	1551	Ground
17	RED/BLK	645	Low Reference
18	-	-	Not Used
19	WHT	1390	Off/Run/Crank Voltage
20	ORN	240	Battery Positive Voltage
21-27	-	-	Not Used
28	TAN	413	HO2S Low Reference
29	TAN	413	HO2S Low Reference
30	PPL	420	TCC Brake Switch/Cruise Control Release Signal
31	BLK	552	Low Reference
32	GRY	435	EGR Solenoid Low Control
33	DK BLU	496	Knock Sensor 1 Signal
34	LT BLU	1876	Knock Sensor 2 Signal
35-37	-	-	Not Used
38	LT GRN/WHT	1749	IAC Coil B High Control
39-42	-	-	Not Used
43	YEL/BLK	846	Fuel Injector 6 Control
44	YEL/BLK	1223	2-3 Shift Solenoid Valve Control
45	-	-	Not Used
46	LT BLU/BLK	844	Fuel Injector 4 Control
47	BLK/WHT	845	Fuel Injector 5 Control
48	RED/BLK	453	Low Reference
49-52	-	-	Not Used
53	TAN/BLK	424	IC Timing Signal
54	WHT	423	IC Timing Control
55	DK GRN/WHT	817	Vehicle Speed Signal
56	BLK/WHT	1551	Ground
57	BLK/WHT	1551	Ground
58	PPL	1807	Class 2 Serial Data
59	PPL	1807	Class 2 Serial Data
60	BLK/WHT	1551	Ground
61	BLK	452	Low Reference
62	DK BLU/WHT	1231	AT ISS Low Signal
63	RED/BLK	1230	AT ISS High Signal
64	YEL	400	Signal High - Front
65	PPL	401	Signal Low - Front
66-67	-	-	Not Used
68	YEL	772	Transmission Range Switch Signal B
69	YEL	492	MAF Sensor Signal
70	-	-	Not Used
71	ORN/BLK	463	Requested Torque Signal (w/NV8)
72	DK GRN	83	Cruise Control Inhibit Signal
73	LT GRN/BLK	1745	Fuel Injector 2 Control
74-75	-	-	Not Used
76	DK GRN/WHT	428	EVAP Canister Purge Solenoid Control
77-78	-	-	Not Used
79	BLK	1744	Fuel Injector 1 Control
80	BLK	808	Low Reference