Engine Control Module (ECM) X1 (LH2)

WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Control Module (ECM) X1 (LH2) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1-6	-	-	Not Used
7	0.35 WH	17	Stop Lamp Switch Signal
8	-	-	Not Used
9	0.35 TN	2759	Low Reference
10-11	-	-	Not Used
12	0.35 BN/WH	419	MIL Control
13	0.35 D-GN/WH	465	Fuel Pump Relay Control - Primary
14-17	-	-	Not Used
18	0.35 D-BU	5985	Accessory Wakeup Serial Data
19	0.5 PK	239	Ignition Voltage
20	0.5 RD/WH	340	Battery Positive Voltage
21-25	-	-	Not Used
26	0.35 YE	447	Starter Relay Coil Control
27-32	-	-	Not Used
33	WH/BK	1164	5-Volt Reference
34	0.35 GY	2709	5-Volt Reference
35	0.35 TN	1274	5-Volt Reference
36	0.35 BN	1271	Low Reference
37	0.35 PU	1272	Low Reference
38-39	-	-	Not Used
40	0.35 BN	5069	Main Relay Control
41-43	-	-	Not Used
44	0.35 D-BU	1936	Fuel Level Sensor Signal - Primary
45	0.35 L-BU	1937	Fuel Level Sensor Signal - Secondary
46	-	-	Not Used
47	0.35 D-BU	1161	APP Sensor 1 Signal
48	0.35 D-GN	890	Fuel Tank Pressure Sensor Signal
49	0.35 L-BU	1162	APP Sensor 2 Signal
50-52	-	-	Not Used
53	0.35 D-GN/WH	459	A/C Compressor Clutch Relay Control
54	0.35 D-BU	473	High Speed Cooling Fan Relay Control
55	0.35 WH	1310	EVAP Canister Vent Solenoid Control
56	-	-	Not Used

Connector Part Information

OEM: 34576-0703
Service: 88988373
Description: 56-Way F (BU)

Terminal Part Information

Pins: 7, 9, 12-13, 18, 26, 33-37, 40, 44-45, 47-49, 53-54
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 19-20, 55
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 1-2, 4-5, 7, 9, 10, 12-13, 15, 24-26, 28, 30, 33-35, 39-41, 43-46, 48-52, 55-56
Terminal/Tray: 1928498135/19
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)