Engine Control Module (ECM) C

Fig 1: Engine Control Module (ECM) C Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire Color	Circuit No.	Function
1	GY	596	5-Volt Reference
2	OG/BK	1031	5-Volt Reference
3	BN	718	Low Reference
4	L-BU	1937	Low Reference
5	L-BU	1937	Fuel Level Sensor Supply
6	GY	474	5-Volt Reference
7-8	-	-	Not Used
9	WH	645	Low Reference
10-11	-	-	Not Used
12	OG/BK	1733	Ignition 1 Voltage
13	OG/BK	1733	Ignition 1 Voltage
14	-	-	Not Used
15	L-BU	1888	CPP Switch Signal (M/T)
16	-	-	Not Used
17	RD/WH	440	Battery Positive Voltage
18	RD/WH	440	Battery Positive Voltage
19	BK/WH	50	Ground
20	BK/WH	50	Ground
21	BK/WH	50	Ground
22	BK/WH	50	Ground
23-24	-	-	Not Used
25	D-GN/WH	762	A/C Request Signal
26	L-BU	20	Stop Lamp Switch Output
27	-	-	Not Used
28	PU	878	Stop Lamp Switch Output
29	D-BU	1161	APP Sensor 1 Signal
30	L-B U	203	A/C Pressure Sensor Signal
31	BK/WH	2051	Serial Data
32	-	-	Not Used
33	PK	1739	Ignition 1 Voltage
34	D-BU	473	High Speed Cooling Fan Relay Control
35	PU/WH	67	A/C Clutch Relay Control
36	BN	1741	Main Relay Control
37	YE	183	Cruise Indicator Control
38	D-GN/WH	817	Vehicle Speed Signal (M/T)
39-40	-	-	Not Used
41	WH	121	Engine Speed Signal
42	L-GN	497	Fuel Pump Relay Control
43	D-BU	1936	Fuel Level Sensor Signal
44	L-BU	1162	APP Sensor 2 Signal
45	GY	397	Cruise Control Switch Signal
46	PU	1807	CAN Serial Data High
47	BN/BK	1030	Fuel Tank Pressure Sensor Signal
48	D-GN	602	Rough Road Sensor Signal
49	BN/WH	419	MIL Control
50	GY/D-GN	355	Low Speed Cooling Fan Relay Control
51-55	-	-	Not Used
56	D-GN	135	Engine Coolant Temperature Gage Control
57	BN	1671	HO2S2 Heater Control
58-60	-	-	Not Used
61	PU	30	Fuel Gage Control
62	BN	413	HO2S2 Signal
63	YE	710	CAN Serial Data Low
64	BN	834	ABS (JM4)

Connector Part Information

Terminal Part Information