Engine Control Module (ECM) X1 (LH2)

WARNING: This page is about a different car, the 2009 Cadillac STS. 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	0.5 TN	2759	Low Reference
10-11	-	-	Not Used
12	0.35 BN/WH	419	MIL Control
13	0.5 D-GN/WH	465	Fuel Pump Relay Control (Primary)
14-17	-	-	Not Used
18	0.35 YE/BK	5728	ECM/TCM Serial Data Wake Up
19	0.75 PK	239	Run/Crank Ignition 1 Voltage
20	0.5 RD/WH	1440	Battery Positive Voltage
21-32	-	-	Not Used
33	0.5 WH/BK	1164	Accelerator Pedal Position 5-Volt Reference (1)
34	0.5 GY	2709	5-Volt Reference 1
35	0.5 TN	1274	5-Volt Reference 1
36	0.5 BN	1271	Low Reference
37	0.5 PU	1272	Low Reference
38	-	-	Not Used
39	0.35 BN	818	Vehicle Speed Signal
40	0.5 BN	5069	Powertrain Relay Control
41-43	-	-	Not Used
44	0.35 D-BU	1936	Fuel Level Sensor Signal
45	0.35 L-BU	1937	Secondary Fuel Level Sensor Signal
46	-	-	Not Used
47	0.5 D-BU	1161	APP Sensor 1 Signal
48	0.5 D-GN	890	Fuel Tank Pressure Sensor Signal
49	0.5 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	0.75 WH	1310	EVAP Canister Vent Solenoid Control
56	0.35 YE	447	Starter Relay Coil Control

Connector Part Information

OEM: 34576-4203
Service: 88988373
Description: 56-Way F Sealed (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, 19-20, 33, 35-37, 46-49, 55
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 9, 12-13, 20, 33, 35-37, 46-49 - J/J
Core/Insulation Crimp: Pins 19, 55 - K/K
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)