Engine Control Module (ECM) Connector End View C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		9123-7148 56 F (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	-	-	Not Used
4	BN/WH	419	Check Engine Indicator Lamp Output
5-6	-	-	Not Used
7	BN	1271	Electronic Throttle Pedal Position Return 1
8	PU	1272	Electronic Throttle Pedal Position Return 2
9	-	-	Not Used
10	BN	5069	Engine Control Relay Coil Control
11-12	-	-	Not Used
13	YE	447	Starter Relay Output-Coil
14	PK	439	Ignition 1 Voltage
15-17	-	-	Not Used
18	YE	1843	Accessory Voltage
19	OG	300	Ignition 3 Voltage
20	OG/BK	740	Battery Positive Voltage
21	PU/WH	5197	VSS Signal
22	BU	1161	Electronic Throttle Pedal Position Signal 1
23	-	-	Not Used
24	GN	890	Fuel Tank Pressure Sensor Signal
25	-	-	Not Used
26	GN/BK	380	A/C Refrigerant Pressure Sensor Signal
27-28	-	-	Not Used
29	TH	1274	Electronic Throttle Pedal Position 5-Volt Reference 2
30	GN	2700	A/C Refrigerant Pressure Sensor Signal 5-Volt Reference
31	GY	2709	Fuel Tank Pressure Sensor 1, 5-Volt Reference
32	BU/RD	20	Stop Lamp Switch Signal
33-34	-	-	Not Used
35	WH/BK	1164	Electronic Throttle Pedal Position 5 Volt Reference 1
36	OG/BK	335	Low Speed Cooling Fan Relay Control
37	PU	30	Fuel Gage Sensor Signal
38	GY	847	Extended Travel Brake Switch Signal
39-40	-	-	Not used
41	L-BU	1162	Electronic Throttle Pedal Position 2
42	YE	1652	Reverse Lockout Solenoid Control
43	PU/WH	379	CPP Switch Signal
44	-	-	Not Used
45	GN/WH	465	Fuel Pump Relay Feed-Coil
46	BN	86	Cruise Control Release Signal
47	-	-	Not Used
48	BN	121	Tachometer Signal
49-50	-	-	Not Used
51	GN/BU	275	Park/Neutral Position Switch Park Signal
52	PU	5	Crank Voltage
53-54	-	-	Not Used
55	TN	5514	A/C Refrigerant Pressure Sensor Signal
56	BU/WH	473	High Speed Cooling Fan Relay Control