Powertrain Control Module (PCM) Connectors

Powertrain Control Module (PCM) C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 15450304 Service: 88988487 56-Way F (BU)
Pin	Wire Color	Circuit No.	Function
1	TN/BK	2500	High Speed GMLAN Serial Data (+)
2	TN	2501	High Speed GMLAN Serial Data (-)
3	-	-	Not Used
4	GY	2700	5-Volt Reference
5	-	-	Not Used
6	BN/WH	419	MIL Control
7	TN	5514	Low Reference
8-9	-	-	Not Used
10	WH	1310	EVAP Canister Vent Solenoid Control
11	-	-	Not Used
12	TN	2759	Low Reference
13-17	-	-	Not Used
18	YE	743	Accessory Voltage
19	PK	639	Ignition 1 Voltage
20	RD/WH	1440	Battery Positive Voltage
21	-	-	Not Used
22	BN	818	VSS Signal
23	YE	447	Starter Relay Coil Control
24	BN	5069	Engine Main Relay Coil Control
25	-	-	Not Used
26	D-GN	890	Fuel Tank Pressure Sensor Signal
27-30	-	-	Not Used
31	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
32	L-BU	20	Stop Lamp Supply Voltage
33	D-GN/WH	459	A/C Compressor Clutch Relay Control
34-36	-	-	Not Used
37	D-GN/WH	465	Fuel Pump Primary Relay Control
38	OG/BK	1786	Transmission Park/Neutral Signal
39-42	-	-	Not Used
43	PU	1589	Primary Fuel Level Sensor Signal
44	GY	1884	Cruise Control Set/Coast/Resume/Accelerate Switch Signal
45	-	-	Not Used
46	PU	420	Torque Converter Clutch Brake Switch Signal
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	Fuel Tank Pressure Sensor 5-Volt Reference
54-56	-	-	Not Used

Powertrain Control Module (PCM) C2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 15450306 Service: 88988489 73-Way F (BK)
Pin	Wire Color	Circuit No.	Function
1	BN	1456	Exhaust Gas Recirculation Valve Position Signal
2	TN	800	UART Serial Data 1
3	OG/BK	1061	UART Serial Data 2
4	PK/BK	1746	Fuel Injector Control 3
5	TN	1744	Fuel Injector Control 1
6	L-GN/BK	1745	Fuel Injector Control 2
7	TN/WH	845	Fuel Injector Control 5
8	TN	2753	Exhaust Gas Recirculation Sensor Low Reference
9	YE/BK	846	Fuel Injector Control 6
10	L-BU/BK	844	Fuel Injector Control 4
11	OG/WH	2122	IC 2 Control
12	GY/WH	3113	Heated Oxygen Sensor Heater Low Control Bank 1 Sensor 1
13	OG	1676	Exhaust Gas Recirculation Solenoid Supply Voltage
14	-	-	Not Used
15	PU	574	Low Reference
16	GY	435	Exhaust Gas Recirculation Solenoid Control
17	-	-	Not Used
18	L-GN	432	Manifold Absolute Pressure Sensor Signal
19-20	-	-	Not Used
21	OG	631	Camshaft Sensor 12-Volt Reference
22	L-GN	1867	Crankshaft Position Sensor 12-Volt Reference
23-25	-	-	Not Used
26	BN/WH	633	Camshaft Position Sensor Signal
27	L-BU/BK	647	Medium Resolution Engine Speed Signal
28-29	-	-	Not Used
30	OG/BK	469	Manifold Absolute Pressure Sensor Low Reference
31	-	-	Not Used
32	PK/BK	632	Camshaft Position Sensor Low Reference
33	GY	5047	Exhaust Gas Recirculation 5-Volt Reference
34	GY	2704	5-Volt Reference
35	-	-	Not Used
36	GY	2303	Knock Sensor Low Reference 2
37	YE	2174	Ignition Control Timing Low Reference 1
38	D-BU	496	Knock Sensor Signal 1
39	BK/WH	1251	Ground
40	GY	1716	Knock Sensor Low Reference 1
41	D-GN/WH	428	EVAP Canister Purge Solenoid Control
42-46	-	-	Not Used
47	TN/WH	1653	HO2S 1 Low Signal
48	PU/WH	1665	HO2S 1 High Signal
49-52	-	-	Not Used
53	OG	225	Generator Turn On Signal
54	L-BU	1876	Knock Sensor Signal 2
55	YE	410	Engine Coolant Temperature Sensor Signal
56	BK/WH	1351	Ground
57	TN/BK	231	Oil Pressure Switch Signal
58-60	-	-	Not Used
61	PU	2121	IC 1 Control
62	-	-	Not Used
63	L-BU	2123	Ignition Control 3
64-72	-	-	Not Used
73	BK/WH	451	Ground

Powertrain Control Module (PCM) C3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 15450305 Service: 88988488 56-Way F (L-GY)
Pin	Wire Color	Circuit No.	Function
1-3	-	-	Not Used
4	TN/WH	1669	HO2S 2 Low Signal
5	-	-	Not Used
6	YE	492	Mass Air Flow Sensor Signal
7	-	-	Not Used
8	GY/WH	3122	HO2S 2 Heater Low Control
9-18	-	-	Not Used
19	PU/WH	1668	HO2S 2 High Signal
20-25	-	-	Not Used
26	TN	472	Intake Air Temperature Sensor Signal
27-49	-	-	Not Used
50	TN	2760	Intake Air Temperature Sensor Low Reference
51-56	-	-	Not Used