Engine Control Module (ECM) X1

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

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

Courtesy of GENERAL MOTORS COMPANY

Pin	Wire	Circuit	Function
1-6	-	-	Not Used
7	0.5 WH	17	Stop Lamp Switch Signal
8	-	-	Not Used
9	0.5 BN	2759	Low Reference
10-11	-	-	Not Used
12	0.35 BN/WH	419	MIL Control
13	0.5 GN/WH	465	Fuel Pump Relay Control
14-17	-	-	Not Used
18	0.5 D-BU	5985	Accessory Wake up Serial Data
19	0.5 PK	439	Ignition 1 Voltage
20	0.5 RD/WH	4640	Battery Positive Voltage
21-25	-	-	Not Used
26	0.5 YE	447	Starter Relay Coil Control
27-32	-	-	Not Used
33	0.5 WH/BK	1164	5-Volt Reference 2
34	0.5 GY	416	5-Volt Reference 1
35	0.5 BN/BK	1274	5-Volt Reference 1
36	0.5 TN	1271	Low Reference
37	0.5 PU/WH	1272	Low Reference
38-39	-	-	Not Used
40	0.5 OG/WH	5069	PWTRAIN Relay Control
41-43	-	-	Not Used
44	0.5 PU/BK	1589	Primary Fuel Level Sensor Signal
45-46	-	-	Not Used
47	0.5 D-BU/WH	1161	APP Sensor 1 Signal
48	0.35 GN	890	Fuel Tank Pressure Sensor Signal
49	0.5 L-BU	1162	APP Sensor 2 Signal
50	-	-	Not Used
51	0.5 PU	421	Air Solenoid Relay Control
52	-	-	Not Used
53	0.5 GN/WH	459	A/C Compressor Clutch Relay Control
54	0.5 OG	473	High Speed Cooling Fan Relay Control
55	0.5 BN/WH	1310	EVAP Canister Vent Solenoid Control
56	-	-	Not Used

Connector Part Information

Harness Type: Engine
OEM Connector: 34576-2803
Service Connector: 88988373
Description: 56-Way F MX123 34576 Series (BK)

Terminal Part Information

Terminated Lead: 13575575
Release Tool: J-38125-213
Diagnostic Test Probe: J-35616-64B (L-BU)
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J