Powertrain Control Module (PCM) Connectors

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) Connector C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191489 80-Way F Micro-Pack 100W Sealed (BU)
Pin	Wire Color	Circuit No.	Function
1	BK	450	Ground
2	L-GN	1867	12-Volt Reference
3	PK/BK	1746	Fuel Injector 3 Control
4	L-GN/BK	1745	Fuel Injector 2 Control
5-6	-	-	Not Used
7	GY	705	5-Volt Reference
8	GY	597	5-Volt Reference
9-10	-	-	Not Used
11	L-BU	1876	Knock Sensor 2 Signal
12	D-BU/WH	1869	CKP Sensor Signal
13	OG/BK	463	Requested Torque Signal
14	OG/BK	1061	UART Serial Data
15	D-BU/WH	774	UART Serial Data
16	-	-	Not Used
17	D-BU	1225	Transmission Fluid Pressure Switch Signal B
18	RD	1226	Transmission Fluid Pressure Switch Signal C
19	PK	439	Ignition 1 Voltage
20	OG	440	Battery Positive Voltage
21	YE/BK	1868	Low Reference
22	-	-	Not Used
23	BK	2759	Low Reference
24	BK	450	Heater Ground - Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
25	TN	1671	HO2S Low Signal - Bank 2 Sensor 2
26	TN	1667	HO2S Low Signal - Bank 2 Sensor 1
27	BK	450	Heater Ground - Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2
28	TN/WH	1669	HO2S Low Signal - Bank 1 Sensor 2
29	TN	1664	HO2S Low Signal - Bank 1 Sensor 1
30-31	-	-	Not Used
32	BK/WH	771	Transmission Range Switch Signal A
33	PU	420	TCC Brake Switch/Cruise Control Release Signal
34	WH	776	Transmission Range Switch Signal P
35	-	-	Not Used
36	BK	1744	Fuel Injector 1 Control
37	YE/BK	846	Fuel Injector 6 Control
38	-	-	Not Used
39	YE/BK	625	Starter Enable Relay Control
40	BK	450	Ground
41	-	-	Not Used
42	WH/BK	2366	Cooling Fan Clutch Control
43	RD/BK	877	Fuel Injector 7 Control
44	L-BU/BK	844	Fuel Injector 4 Control
45	GY	2700	5-Volt Reference
46	GY	2709	5-Volt Reference
47	-	-	Not Used
48	GY	2704	5-Volt Reference
49-50	-	-	Not Used
51	D-BU	496	Knock Sensor 1 Signal
52	-	-	Not Used
53	BK	2762	Low Reference
54	OG/BK	469	Low Reference
55-56	-	-	Not Used
57	OG	440	Battery Positive Voltage
58	D-GN	1049	PCM Class 2 Serial Data
59	YE	710	Class 2 Serial Data
60	GY	2365	Low Reference
61	PK/BK	632	Low Reference
62	-	-	Not Used
63	BK	407	Low Reference
64	BK	450	Heater Ground - Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
65	PU	1670	HO2S High Signal - Bank 2 Sensor 2
66	PU	1666	HO2S High Signal - Bank 2 Sensor 1
67	BK	450	Heater Ground - Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2
68	PU/WH	1668	HO2S High Signal - Bank 1 Sensor 2
69	PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1
70-71	-	-	Not Used
72	YE	772	Transmission Range Switch Signal B
73	BN/WH	633	CMP Sensor Signal
74	YE	410	ECT Sensor Signal
75	PK	1020	Ignition 0 Voltage
76	BK/WH	845	Fuel Injector 5 Control
77	D-BU/WH	878	Fuel Injector 8 Control
78	-	-	Not Used
79	WH	687	3-2 Shift Solenoid Valve Control
80	GY	720	Low Reference

Powertrain Control Module (PCM) Connector C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191488 80-Way F Micro-Pack 100W Sealed (GN)
Pin	Wire Color	Circuit No.	Function
1	BK	450	Ground
2	BN	418	TCC PWM Solenoid Valve Control
3-4	-	-	Not Used
5	TN/BK	464	Delivered Torque Signal
6	RD/BK	1228	PC Solenoid Valve High Control (Sol. A)
7	-	-	Not Used
8	L-BU/WH	1229	PC Solenoid Valve Low Control (Sol. A)
9	D-GN/WH	465	Fuel Pump Relay Control
10	WH	121	Engine Speed Signal
11-13	-	-	Not Used
14	RD/BK	380	A/C Refrigerant Pressure Sensor Signal
15	RD	225	Generator Turn-On Signal
16	GY/BK	1694	4WD Low Signal
17-19	-	-	Not Used
20	L-GN/BK	822	VSS Low Signal
21	PU/WH	821	VSS High Signal
22-24	-	-	Not Used
25	TN	472	IAT Sensor Signal
26	PU	2121	IC 1 Control
27	RD	2127	IC 7 Control
28	L-BU/WH	2126	IC 6 Control
29	D-GN/WH	2124	IC 4 Control
30	D-BU	2364	Cooling Fan Speed Signal
31	YE	492	MAF Sensor Signal
32	L-GN	432	MAP Sensor Signal
33	-	-	Not Used
34	D-GN/WH	428	EVAP Canister Purge Solenoid Control
35-38	-	-	Not Used
39	RD	631	12-Volt Reference
40	BK	450	Ground
41	-	-	Not Used
42	TN/BK	422	TCC Solenoid Valve Control
43	D-GN/WH	459	A/C Compressor Clutch Relay Control
44	-	-	Not Used
45	WH	1310	EVAP Canister Vent Solenoid Control
46	BN/WH	419	MIL Control
47	YE/BK	1223	2-3 Shift Solenoid Valve Control
48	L-GN	1222	1-2 Shift Solenoid Valve Control
49	YE/BK	1827	Vehicle Speed Signal
50	D-GN/WH	817	Vehicle Speed Signal
51	YE/BK	1227	TFT Sensor Signal
52	BN	2391	HO2S Heater Low Control - Bank 1 Sensor 2
53	RD/WH	3223	HO2S Heater Low Control - Bank 2 Sensor 2
54	PU	1589	Fuel Level Sensor Signal
55-56	-	-	Not Used
57	BK	2760	Low Reference
58	TN/WH	332	Oil Pressure Sensor Signal
59	PU	806	Crank Voltage
60	BN	2129	Low Reference
61	BN/WH	2130	Low Reference
62	GY	773	Transmission Range Switch Signal C
63	PK	1224	Transmission Fluid Pressure Switch Signal A
64	D-GN	890	Fuel Tank Pressure Sensor Signal
65	-	-	Not Used
66	PU/WH	2128	IC 8 Control
67	RD/WH	2122	IC 2 Control
68	D-GN	2125	IC 5 Control
69	L-BU	2123	IC 3 Control
70-71	-	-	Not Used
72	BK/WH	3113	HO2S Heater Low Control - Bank 1 Sensor 1
74	L-GN	3212	HO2S Heater Low Control - Bank 2 Sensor 1
75	GY	23	Generator Field Duty Cycle Signal
76-79	-	-	Not Used
80	BK	2751	Low Reference