Engine Control Module (ECM) C1

Fig 1: Connector End Views

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) Connector End Views

Connector Part Information

Terminal Part Information

Engine Control Module (ECM) C1

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	-	-	Not Used
4	BN/WH	419	MIL Control
5-6	-	-	Not Used
7	PU	1272	Low Reference
8	WH/BK	1164	5-Volt Reference
9	-	-	Not Used
10	BN	5069	Main Relay Control
11-13	-	-	Not Used
14	PK/BK	5290	Ignition 1 Voltage
15-17	-	-	Not Used
18	D-BU	5985	Accessory Wake Up Serial Data
19	PK	439	Ignition 1 Voltage
20	RD/WH	540	Battery Positive Voltage
21	-	-	Not Used
22	L-BU	1162	APP Sensor 2 Signal
23	-	-	Not Used
24	D-GN	890	Fuel Tank Pressure Sensor Signal
25	-	-	Not Used
26	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
27-28	-	-	Not Used
29	BN	1271	Low Reference
30	GY	2700	A/C Pressure Sensor 5 Volt Reference
31	GY	2709	5-Volt Reference
32	WH	17	Stop Lamp Switch Signal
33-34	-	-	Not Used
35	TN	1274	5-Volt Reference
36	D-GN	335	Low Speed Cooling Fan Relay Control
37	PU	30	Fuel Level Sensor Signal
38-40	-	-	Not Used
41	D-BU	1161	APP Sensor 1 Signal
42-44	-	-	Not Used
45	D-GN/WH	465	Fuel Pump Relay Control [- Primary]
46-53	-	-	Not Used
54	WH	1310	EVAP Canister Vent Solenoid Control
55	BK/WH	2751	Low Reference
56	L-BU	473	High Speed Cooling Fan Relay Control