Powertrain Control Module (PCM) Connector End Views

PCM Connector C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information			15357147 (early) 15430221 (late) 56-Way F Micro 64 (BLU)
Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	BRN	436	AIR Pump Relay Control
4	DK BLU	473	High Speed Cooling Fan Relay Control
5-7	-	-	Not Used
8	DK GRN/WHT	817	Vehicle Speed Signal
9-10	-	-	Not Used
11	RED/BLK	380	A/C Refrigerant Pressure Sensor Signal
12	PPL	1589	Fuel Level Sensor Signal (Primary)
13-14	-	-	Not Used
15-16	PPL	1807	Class 2 Serial Data (Primary)
17	-	-	Not Used
18	WHT	1310	EVAP Canister Vent Solenoid Control
19	PNK	39	Ignition 1 Voltage
20	ORN	240	Battery Positive Voltage
21	-	-	Not Used
22	DK GRN	83	Cruise Control Inhibit Signal
23	WHT	121	Engine Speed Signal
24-30	-	-	Not Used
31	GRY	2709	5-Volt Reference
32	BLK	2751	Low Reference
33-34	-	-	Not Used
35	BLK	2759	Low Reference
36-37	-	-	Not Used
38	WHT	1390	Off/Run/Crank Voltage
39	GRY	847	Extended Travel Brake Switch Signal
40	-	-	Not Used
41	DK GRN	890	Fuel Tank Pressure Sensor Signal
42	-	-	Not Used
43	GRY	2700	5-Volt Reference
44	DK GRN/WHT	465	Fuel Pump Relay Control (Primary)
45	YEL	447	Starter Relay Coil Control
46	DK GRN	335	Low Speed Cooling Fan Relay Control
47	-	-	Not Used
48	LT BLU/BLK	396	Cruise Control Engaged Signal
49-50	-	-	Not Used
51	PPL	420	TCC Brake Switch/Cruise Control Release Signal
52	YEL	5	Crank Voltage
53	PNK/WHT	1101	Damping Lift/Dive Signal
54	-	-	Not Used
55	BRN/WHT	419	MIL Control
56	DK GRN/WHT	459	A/C Compressor Clutch Relay Control

PCM Connector C2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information			15357131 (early) 15430229 (late) 73-Way F Micro 64 (BLK)
Pin	Wire Color	Circuit No.	Function
1	BRN	1174	Oil Level Switch Signal
2	RED	1676	EGR Solenoid High Control
3	PPL/WHT	421	Rear AIR Pump Relay Control
4	-	-	Not Used
5	TAN/WHT	3111	HO2S Low Signal (Bank 1 Sensor 1)
6	GRY (Early) GRY/WHT (late)	2702	5-Volt Reference
7	-	-	Not Used
8	GRY	2701	5-Volt Reference
9	GRY	435	EGR Solenoid Low Control or EGR Solenoid Control
10	RED	225	Generator Turn On Signal
11	LT BLU	1876	Knock Sensor 2 Signal
12	GRY	23	Generator Field Duty Cycle Signal
13	GRY	1716	Knock Sensor 1 (KS1) Low Reference
14	-	-	Not Used
15	PPL	3120	HO2S High Signal (Bank 1 Sensor 2)
16	BRN	1456	EGR Valve Position Signal
17	LT GRN/WHT	1749	IAC Coil B High Control
18	YEL	410	ECT Sensor Signal
19	DK BLU	496	Knock Sensor 1 Signal
20	TAN/WHT	3121	HO2S Low Signal (Bank 1 Sensor 2)
21	PNK/BLK	632	Low Reference
22	DK BLU	417	TP Sensor Signal
23	PPL	2121	IC 1 Control
24	LT BLU/WHT	2126	IC 6 Control
25	ORN	1799	High Resolution Signal
26	-	-	Not Used
27	GRY	2303	Low Reference Knock Sensor 2 (KS2)
28	YEL/BLK	573	Crank Sensor B Signal
29	PPL/WHT	3110	HO2S High Signal (Bank 1 Sensor 1)
30	GRY	2704	5-Volt Reference (MAP)
31	LT BLU/WHT	1800	Crank Sensor A Signal
32	-	-	Not Used
33	BLK	2761	Low Reference (Coolant Sensor)
34	RED	2127	IC 7 Control
35	BLK	2753	Low Reference (EGR)
36	ORN/BLK	469	Low Reference (MAP)
37	BLK	2752	Low Reference (TPS)
38	-	-	Not Used
39	BRN	2129	Low Reference (EST Bank 1)
40	-	-	Not Used
41	YEL/BLK	1868	Low Reference
42	BRN/WHT	2130	Low Reference (EST Bank 2)
43	LT BLU	2123	IC 3 Control
44-45	-	-	Not Used
46	YEL	2868	Low Reference (Crank Return)
47	TAN/BLK	231	Oil Pressure Switch Signal
48	-	-	Not Used
49	RED	631	12-Volt Reference
50	LT GRN	1867	12-Volt Reference
51	LT GRN	2867	12-Volt Reference
52	-	-	Not Used
53	LT BLU/BLK	1748	IAC Coil A Low Control
54	BLK/WHT	3113	HO2S Heater Low Control (Bank 1 Sensor 1]
55	BLK/WHT	845	Fuel Injector 5 Control
56	BRN	3122	HO2S Heater Low Control (Bank 1 Sensor 2)
57	DK BLU/WHT	878	Fuel Injector 8 Control
58	LT GRN/BLK	444	IAC Coil B Low Control
59	LT BLU/BLK	844	Fuel Injector 4 Control
60	YEL/BLK	846	Fuel Injector 6 Control
61	LT BLU/WHT	1747	IAC Coil A High Control
62	DK GRN/WHT	2124	IC 4 Control
63	PPL/WHT	2128	IC 8 Control
64	DK GRN	2125	IC 5 Control
65	RED/WHT	2122	IC 2 Control
66	PNK/BLK	1746	Fuel Injector 3 Control
67	LT GRN	432	MAP Sensor Signal
68	-	-	Not Used
69	RED/BLK	877	Fuel Injector 7 Control
70	DK GRN/WHT	428	EVAP Canister Purge Solenoid Control
71	BLK	1744	Fuel Injector 1 Control
72	LT GRN	1745	Fuel Injector 2 Control
73	BLK/WHT	451	Ground

PCM Connector C3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information			15357148 (early) 15430220 (late) 56-Way F Micro 64 (GRY)
Pin	Wire Color	Circuit No.	Function
1	PNK	1224	Transmission Fluid Pressure Switch Signal A
2	YEL/BLK	1223	2-3 Shift Solenoid or Shift Solenoid B Valve Control
3	LT BLU/WHT	1229	PC Solenoid Valve Low Control (Sol. A)
4	TAN/BLK	464	Delivered Torque Signal
5	YEL	772	Transmission Range Switch Signal B?
6	GRY	773	Transmission Range Switch Signal C
7	WHT	776	Transmission Range Switch Signal P
8	-	-	Not Used
9	WHT	905	Not Used
10	YEL/BLK	1227	TFT Sensor Signal
11	YEL	492	MAF Sensor Signal
12-15	-	-	Not Used
16	LT GRN	3212	HO2S Heater Low Control (Bank 2 Sensor 1)
17-18	-	-	Not Used
19	TAN/WHT	3211	HO2S Low Signal (Bank 2 Sensor 1)
20-21	-	-	Not Used
22	PPL	401	Signal Low - Front/VSS Low Signal/OSS Low Signal
23-26	-	-	Not Used
27	ORN/BLK	463	Requested Torque Signal
28-31	-	-	Not Used
32	BLK/WHT	771	Transmission Range Switch Signal A
33	DK BLU/WHT	1231	AT ISS Low Signal
34	BLK	2760	Low Reference (IAT)
35	BLK	2762	Low Reference (Trans Fluid Temp Sensor)
36-42	-	-	Not Used
43	PPL/WHT	3210	HO2S High Signal (Bank 2 Sensor 1)
44	LT GRN	1222	(1-2 Shift Solenoid or Shift Solenoid A) Valve Control
45	RED/BLK	1228	PC Solenoid Valve High Control (Sol. A)
46	-	-	Not Used
47	YEL	400	Signal High - Front/VSS High Signal/OSS High Signal
48	RED	1226	Transmission Fluid Pressure Switch Signal C
49-50	-	-	Not Used
51	TAN	472	IAT Sensor Signal
52-53	-	-	Not Used
54	OG/BK	1230	AT ISS High Signal
55	TAN/BLK	422	TCC Solenoid Valve Control
56	-	-	Not Used