Powertrain Control Module (PCM) Connectors

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 GMC Yukon XL, 2004 GMC Yukon, 2004 Chevrolet Tahoe, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191489 80-Way F Micro-Pack 100 Series (BLU)
Pin	Wire Color	Circuit No.	Function
1	BLK/WHT	451	Ground
2	LT GRN	1867	12-Volt Reference
3	PNK/BLK	1746	Fuel Injector 3 Control
4	LT GRN/BLK	1745	Fuel Injector 2 Control
5-6	-	-	Not Used
7	GRY	2705	5-Volt Reference
8-10	-	-	Not Used
11	LT BLU	1876	Knock Sensor 2 Signal
12	DK BLU/ WHT	1869	CKP Sensor Signal
13	ORN/BLK	463	Requested Torque Signal (NW7)
14	ORN/BLK	1061	UART Serial Data
15	DK BLU/ WHT	774	UART Serial Data
16	-	-	Not Used
17	DK BLU	1225	Transmission Fluid Pressure Switch Signal B (A/T)
18	RED	1226	Transmission Fluid Pressure Switch Signal C (A/T)
19	PNK	439	Ignition 1 Voltage
20	ORN	440	Battery Positive Voltage
21	YEL/BLK	1868	Low Reference
22	-	-	Not Used
23	BLK	470	Low Reference
24	BLK/WHT	451	Ground
25	TAN	1671	HO2S Low Signal - Bank 2 Sensor 2
26	TAN	1667	HO2S Low Signal - Bank 2 Sensor 1
27	BLK/WHT	451	Ground
28	TAN/WHT	1669	HO2S Low Signal - Bank 1 Sensor 2
29	TAN	1664	HO2S Low Signal - Bank 1 Sensor 1
30	LT GRN	1478	Coolant Level Switch Signal
31	-	-	Not Used
32	BLK/WHT	771	Transmission Range Switch Signal A (A/T)
33	PPL	420	TCC Brake Switch/Cruise Control Release Switch Signal
34	WHT	776	Transmission Range Switch Signal P (A/T)
35	GRY	48	CPP Switch Signal (M/T)
36	BLK	1744	Fuel Injector 1 Control
37	YEL/BLK	846	Fuel Injector 6 Control
38	PNK/WHT	1101	Damping Lift/Dive Signal
39	YEL/BLK	625	Starter Enable Relay Control
40	BLK/WHT	451	Ground
41-42	-	-	Not Used
43	RED/BLK	877	Fuel Injector 7 Control
44	LT BLU/BLK	844	Fuel Injector 4 Control
45	GRY	2700	5-Volt Reference (A/C)
46	GRY	474	5-Volt Reference (EVA)
47	-	-	Not Used
48	GRY	597	5-Volt Reference
49-50	-	-	Not Used
51	DK BLU	496	Knock Sensor 1 Signal
52	-	-	Not Used
53	GRY	720	Low Reference (A/T)
54	ORN/BLK	469	Low Reference
55	-	-	Not Used
56	WHT	1579	Fuel Temperature/Composition Signal (L59)
57	ORN	440	Battery Positive Voltage
58	DK GRN	1049	Class 2 Serial Data
59	YEL	710	Class 2 Serial Data
60	-	-	Not Used
61	PNK/BLK	632	Low Reference
62	-	-	Not Used
63	BLK	2755	Low Reference
64	BLK/WHT	451	Ground
65	PPL	1670	HO2S High Signal - Bank 2 Sensor 2
66	PPL	1666	HO2S High Signal - Bank 2 Sensor 1
67	BLK/WHT	451	Ground
68	PPL/WHT	1668	HO2S High Signal - Bank 1 Sensor 2
69	PPL/WHT	1665	HO2S High Signal - Bank 1 Sensor 1
70	BRN	1174	Oil Level Switch Signal
71	-	-	Not Used
72	YEL	772	Transmission Range Switch Signal B (A/T)
73	BRN/WHT	633	CMP Sensor Signal
74	YEL	410	ECT Sensor Signal
75	PNK	1020	Off/Run/Crank Voltage
76	BLK/WHT	845	Fuel Injector 5 Control
77	DK BLU/ WHT	878	Fuel Injector 8 Control
78	-	-	Not Used
79	WHT	687	3-2 Shift Solenoid Valve Control (M30/M32)
80	BLK	407	Low Reference

Powertrain Control Module (PCM) C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191488 80-Way F Micro-Pack 100 Series (GRN)
Pin	Wire Color	Circuit No.	Function
1	BLK/WHT	451	Ground
2	BRN	418	TCC PWM Solenoid Valve Control (A/T)
3	TAN	1465	Fuel Pump Relay Control - Secondary (Dual Tanks)
4	-	-	Not Used
5	TAN/BLK	464	Delivered Torque Signal (NW7)
6	RED/BLK	1228	PC Solenoid Valve High Control (A/T)
7	-	-	Not Used
8	LT BLU/WHT	1229	PC Solenoid Valve Low Control (A/T)
9	DK GRN/ WHT	465	Fuel Pump Relay Control - Primary
10	WHT	121	Engine Speed Signal
11-13	-	-	Not Used
14	RED/BLK	380	A/C Refrigerant Pressure Sensor Signal (A/C)
15	BRN	25	Charge Indicator Control
16-17	-	-	Not Used
18	DK GRN	1433	Clutch Start Switch Signal (M/T)
19	BLK/WHT	1695	Axle Switch Signal (NP2)
20	LT GRN/BLK	822	VSS Low Signal
21	PPL/WHT	821	VSS High Signal
22	RED/BLK	1230	AT ISS High Signal (4WD w/MT1)
23	DK BLU/ WHT	1231	AT ISS Low Signal (4WD w/MT1)
24	-	-	Not Used
25	TAN	472	IAT Sensor Signal
26	PPL	2121	IC 1 Control
27	RED	2127	IC 7 Control
28	LT BLU/WHT	2126	IC 6 Control
29	DK GRN/ WHT	2124	IC 4 Control
30	-	-	Not Used
31	YEL	492	MAF Sensor Signal
32	LT GRN	432	MAP Sensor Signal
33	-	-	Not Used
34	DK GRN/ WHT	428	EVAP Canister Purge Solenoid Control
35-38	-	-	Not Used
39	RED	631	12-Volt Reference
40	BLK/WHT	451	Ground
41	-	-	Not Used
42	TAN/BLK	422	TCC Solenoid Valve Control (M30/M32)
43	DK GRN/ WHT	459	A/C Compressor Clutch Relay Control (A/C)
44	-	-	Not Used
45	WHT	1310	EVAP Canister Vent Solenoid Control (EVA)
46	BRN/WHT	419	MIL Control
47	YEL/BLK	1223	2-3 Shift Solenoid Valve Control (A/T)
48	LT GRN	1222	1-2 Shift Solenoid Valve Control (A/T)
49	YEL/BLK	1827	Vehicle Speed Signal
50	DK GRN/ WHT	817	Vehicle Speed Signal
51	YEL/BLK	1227	TFT Sensor Signal (A/T)
52	BRN	2391	HO2S Heater Low Control Bank 1 Sensor 2
53	RED/WHT	3223	HO2S Heater Low Control Bank 2 Sensor 2
54	PPL/WHT	1589	Fuel Level Sensor Signal - Primary
55-56	-	-	Not Used
57	BLK	552	Low Reference
58	TAN/WHT	332	Oil Pressure Sensor Signal
59	PPL	806	Crank Voltage
60	BRN	2129	Low Reference
61	BRN/WHT	2130	Low Reference
62	GRY	773	Transmission Range Switch Signal C (A/T)
63	PNK	1224	Transmission Fluid Pressure Switch Signal A (A/T)
64	DK GRN	890	Fuel Tank Pressure Sensor Signal (EVA)
65	-	-	Not Used
66	PPL/WHT	2128	IC 8 Control
67	RED/WHT	2122	IC 2 Control
68	DK GRN	2125	IC 5 Control
69	LT BLU	2123	IC 3 Control
70-71	-	-	Not Used
72	BLK/WHT	3113	HO2S Heater Low Control Bank 1 Sensor 1
73	DK BLU	1936	Fuel Level Sensor Signal - Secondary
74	LT GRN	3212	HO2S Heater Low Control Bank 2 Sensor 1
75	GRY	23	Generator Field Duty Cycle Signal
76-79	-	-	Not Used
80	BLK	2751	Low Reference (A/C)