Engine Control Module (ECM) Connector End View C1

Fig 1: Powertrain Control Module (PCM) C1 & C3 Connector End View

Courtesy of GENERAL MOTORS CORP.

Engine Control Module Connector End Views

Connector Part Information  OEM: 34576-3103 Service: 88988373 Description: 56-Way F (BU)

Terminal Part Information  Pins: 7, 18, 34, 39, 40, 44, 45, 53, 54, 56 Terminal/Tray: 33467-0003/23 Core/Insulation Crimp: H/H Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU) Pins: 9, 12, 13, 20, 33, 35, 36, 37, 46, 47, 48, 49, 19, 55 Terminal/Tray: 33467-0005/23 Core/Insulation Crimp: Pins 9, 12, 13, 20, 33, 35, 36, 37, 46, 47, 48, 49 - J/J Core/Insulation Crimp: Pins 19, 55 - K/K Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C1

Pin	Wire Color	Circuit No.	Function
1-6	-	-	Not Used
7	WH	17	Stop Lamp Switch Signal
8	-	-	Not Used
9	TN	2759	Low Reference
10-11	-	-	Not Used
12	BN/WH	419	MIL Control
13	D-GN/WH	465	Fuel Pump Relay Control (Primary)
14-17	-	-	Not Used
18	YE/BK	5728	ECM/TCM Serial Data Wake Up
19	PK	239	Run/Crank Ignition 1 Voltage
20	RD/WH	1440	Battery Positive Voltage
21-32	-	-	Not Used
33	WH/BK	1164	Accelerator Pedal Position 5-Volt Reference (1)
34	GY	2709	5-Volt Reference
35	TN	1274	5-Volt Reference
36	BN	1271	Low Reference
37	PU	1272	Low Reference
38	-	-	Not Used
39	BN	818	Vehicle Speed Signal
40	BN	5069	Powertrain Relay Control
41-43	-	-	Not Used
44	D-BU	1936	Fuel Level Sensor Signal (Secondary)
45	L-BU	1937	Secondary Fuel Level Sensor Signal
46	BN	7123	Super Charger Inlet Air Pressure Sensor Signal
47	D-BU	1161	APP Sensor 1 Signal
48	D-GN	890	Fuel Tank Pressure Sensor Signal
49	L-BU	1162	APP Sensor 2 Signal
50-52	-	-	Not Used
53	D-GN/WH	459	A/C Compressor Clutch Relay Control
54	D-BU	473	High Speed Cooling Fan Relay Control
55	WH	1310	EVAP Canister Vent Solenoid Control
56	YE	447	Starter Relay Coil Control

Fig 1: Powertrain Control Module (PCM) C1 & C3 Connector End View

Courtesy of GENERAL MOTORS CORP.

Engine Control Module Connector End Views

Connector Part Information  OEM: 15418483 Service: 88953346 Description: 56-Way F Micro-Pack 64 Series (BU)

Terminal Part Information  Pins: 1, 2, 5, 7, 10, 11, 13, 14, 17, 18, 19, 20, 21, 23, 24, 25, 27, 28, 29, 31, 32, 33, 35, 36, 37, 42, 43, 46, 51, 55 Terminal/Tray: 15359541/4 Core/Insulation Crimp: M/M Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)

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 (-)
3-4	-	-	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	WH	17	Stop Lamp Switch Signal
14	YE	447	Starter Relay Coil Control
15-16	-	-	Not Used
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	-	-	Not Used
27	D-BU	1161	APP Sensor 1 Signal
28	BN	818	Vehicle Speed Signal
29	YE	492	MAF Sensor Signal
30	-	-	Not Used
31	TN	2760	Intake Air Temperature Sensor Low Reference
32	BK/WH	2751	Signal Ground
33	OG/WH	812	12-Volt 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
44-45	-	-	Not Used
46	YE/BK	5728	ECM/TCM Serial Data Wake Up
47-50	-	-	Not Used
51	TN	472	IAT Sensor Signal
52-54	-	-	Not Used
55	D-GN	335	Low Speed Cooling Fan Relay Control
56	-	-	Not Used