Engine Control Module (ECM) Connector End Views

WARNING: This page is about a different car, the 2004 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Engine Control Module (ECM) C1 Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418474 56-Way Micro 64 Series (BU)
Pin	Wire Color	Circuit No.	Function
1	TN/BK	2500	High Speed GMLAN Serial Data Bus+
2	TN	2501	High Speed GMLAN Serial Data Bus-
3-4	-	-	Not Used
5	TN	1274	5-Volt Reference
6	-	-	Not Used
7	WH/BK	1164	5-Volt Reference
8-9	-	-	Not Used
10	WH	1310	EVAP Canister Vent Solenoid Control
11	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
12	-	-	Not Used
13	OG	5371	Stop Lamp Switch Signal
14	YE	447	Starter Relay Coil Control
15	PU	1807	Class 2 Serial Data (Primary)
16	PU	1807	Class 2 Serial Data (Primary)
17	PK/BK	5290	Ignition 1 Voltage
18	PK	239	Ignition 1 Voltage
19	PK	239	Ignition 1 Voltage
20	RD/WH	1440	Battery Positive Voltage
21	L-BU	1162	APP Sensor 2 Signal
22	-	-	Not Used
23	D-GN/WH	465	Fuel Pump Relay Control - Primary
24	BN/WH	419	MIL Control
25	D-GN/WH	459	A/C Compressor Clutch Relay Control
26	WH	121	Engine Speed Signal
27	D-BU	1161	APP Sensor 1 Signal
28	BN	818	Vehicle Speed Signal
29	YE	492	MAF Sensor Signal
30	PK/WH	1101	Damping Lift/Dive Signal (F55)
31	TN	2760	Low Reference
32	TN	470	Low Reference
33	OG/WH	812	12-Volt Reference or I/P Dimming Voltage Reference
34	-	-	Not Used
35	GY	2700	5-Volt Reference
36	BN	1271	Low Reference
37	PU	1272	Low Reference
38-41	-	-	Not Used
42	D-BU	473	High Speed Cooling Fan Relay Control
43	BN	5069	Main Relay Control
44	-	-	Not Used
45	GY	847	Extended Travel Brake Switch Signal
46	YE	343	Accessory Voltage
47-48	-	-	Not Used
49	YE/BK	5270	Traction Control Data Signal
50	-	-	Not Used
51	TN	472	IAT Sensor Signal
52	-	-	Not Used
53	GY	1884	Cruise Control Set/Coast and Resume/Accelerate Switch Signal
54	YE	5	Crank Voltage
55	D-GN	335	Low Speed Cooling Fan Relay Control
56	-	-	Not Used

Engine Control Module (ECM) C2 Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15460228 73-Way F Micro 64 Series (BK)
Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	D-GN	485	TP Sensor 1 Signal
4	PU	486	TP Sensor 2 Signal
5-7	-	-	Not Used
8	L-GN	432	MAP Sensor Signal
9	-	-	Not Used
10	YE	573	CKP Sensor 1 Signal
11	L-BU	1876	Knock Sensor 2 Signal
12	GY	23	Generator Field Duty Cycle Signal
13	GY	1716	Low Reference
14	L-GN	5282	CMP Actuator Solenoid Control Exhaust Bank 1
15-16	-	-	Not Used
17	TN	1744	Fuel Injector 1 Control
18	OG/BK	1745	Fuel Injector 2 Control
19	D-BU	496	Knock Sensor 1 Signal
20	L-BU/BK	1746	Fuel Injector 3 Control
21	OG/BK	877	Fuel Injector 7 Control
22	L-GN/BK	845	Fuel Injector 5 Control
23	YE/BK	846	Fuel Injector 6 Control
24	D-BU/WH	878	Fuel Injector 8 Control
25	D-GN	5273	CMP Sensor Signal Exhaust Bank 1
26	-	-	Not Used
27	BN/WH	5303	Low Reference
28	GY	2303	Low Reference
29	PU	5284	CMP Actuator Solenoid Control Intake Bank 1
30	YE/BK	844	Fuel Injector 4 Control
31	OG/BK	5272	CMP Actuator Solenoid Control Intake Bank 2
32	OG	5275	CMP Sensor Signal Intake Bank 1
33	D-BU	5300	12-Volt Reference
34	WH/BK	5283	CMP Actuator Solenoid Control Exhaust Bank 2
35	TN	5301	Low Reference
36	OG/BK	469	Low Reference
37	TN	2752	Low Reference
38	TN	2761	Low Reference
39	BN/WH	2130	Low Reference
40	L-BU	5302	12-Volt Reference
41	PU	574	Low Reference
42	BN	2129	Low Reference
43	PU	5274	CMP Sensor Signal Exhaust Bank 2
44	TN	582	TAC Motor Control - 2
45	GY	5296	Low Reference
46	L-GN	5298	12-Volt Reference
47	BN	5299	Low Reference
48	YE	581	TAC Motor Control - 1
49	YE	5276	CMP Sensor Signal Intake Bank 2
50	L-GN	1867	12-Volt Reference
51	GY	2701	5-Volt Reference
52-53	-	-	Not Used
54	YE	410	ECT Sensor Signal
55	D-GN/WH	428	EVAP Canister Purge Solenoid Control
56-57	-	-	Not Used
58	PU	2121	IC 1 Control
59	OG/WH	2122	IC 2 Control
60	OG	2127	IC 7 Control
61	L-BU	2123	IC 3 Control
62	D-GN/WH	2124	IC 4 Control
63	PU/WH	2128	IC 8 Control
64	D-GN	2125	IC 5 Control
65	GY	2704	5-Volt Reference
66-67	-	-	Not Used
68	OG	225	Generator Turn On Signal
69	L-BU/WH	2126	IC 6 Control
70	-	-	Not Used
71	YE/BK	5297	12-Volt Reference
72	-	-	Not Used
73	BK/WH	1551	Ground

Engine Control Module (ECM) C3 Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418476 56-Way F Micro 64 Series (GY)
Pin	Wire Color	Circuit No.	Function
1	PU	1666	HO2S High Signal - Bank 2 Sensor 1
2	TN	1667	HO2S Low Signal - Bank 2 Sensor 1
3	PU/WH	5281	HO2S Output Pump Current Bank 1 Sensor 1
4-11	-	-	Not Used
12	D-BU	1936	Fuel Level Sensor Signal - Secondary
13	YE	5036	HO2S Heater Low Control - Bank 1 Sensor 2
14	OG/BK	463	Requested Torque Signal
15	-	-	Not Used
16	PU	5035	HO2S Heater Low Control - Bank 2 Sensor 2
17	TN/BK	464	Delivered Torque Signal
18	OG/BK	1786	Ignition Lock Cylinder Control Actuator Signal
19	TN	1671	HO2S Low Signal - Bank 2 Sensor 2
20	PU/WH	1668	HO2S High Signal - Bank 2 Sensor 2
21	TN/WH	1669	HO2S Low Signal - Bank 2 Sensor 2
22	OG	5280	HO2S Input Pump Current Bank 1 Sensor 1
23	BN	1174	Oil Level Switch Signal
24	L-BU	1937	Fuel Gage Sensor - Signal - Right
25	TN/WH	331	Oil Pressure Sensor Signal
26-36	-	-	Not Used
37	TN	452	Low Reference
38	BK	2755	Low Reference
39	-	-	Not Used
40	PU/WH	5037	HO2S Heater Low Control - Bank 1 Sensor 1
41	L-BU	5038	HO2S Heater Low Control - Bank 2 Sensor 1
42	GY	2709	5-Volt Reference
43	PU	1670	HO2S High Signal - Bank 2 Sensor 2
44	D-GN	890	Fuel Tank Pressure Sensor Signal
45	PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1
46	TN/WH	1653	HO2S Low Signal - Bank 1 Sensor 1
47	-	-	Not Used
48	WH	5279	HO2S Output Pump Current Bank 2 Sensor 1
49	L-GN	5278	HO2S Input Pump Current Bank 2 Sensor 1
50	-	-	Not Used
51	GY	2705	5-Volt Reference
52-56	-	-	Not Used