Engine Control Module (ECM) X3 (LS4)

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

Fig 1: Engine Control Module (ECM) X3 (LS4) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1-6	-	-	Not Used
7	0.35 RD	225	Generator Turn On Signal
8-9	-	-	Not Used
10	0.5 TN	5496	Cylinder Shutoff Solenoid Control 6
11	0.5 D-BU	5491	Cylinder Shutoff Solenoid Control 1
12	0.35 TN/BK	464	Delivered Torque Signal
13-16	-	-	Not Used
17	0.35 OG/BK	463	Requested Torque Signal
18-20	-	-	Not Used
21	0.35 BK	2751	Low Reference
22	-	-	Not Used
23	0.5 OG/BK	469	Low Reference
24-28	-	-	Not Used
29	0.35 GY	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Used
33	0.5 TN	2501	High-Speed GMLAN Serial Data Bus (-)
34	-	-	Not Used
35	0.35 BK	2761	Low Reference
36	-	-	Not Used
37	0.35 GY	2700	5-Volt Reference 1
38	-	-	Not Used
39	0.5 GY	2704	5-Volt Reference 1
40-44	-	-	Not Used
45	-	-	Not Used
46	0.35 OG/BK	1786	Park/Neutral Signal
47	-	-	Not Used
48	0.5 D-GN/WH	428	EVAP Canister Purge Solenoid Control
49	0.35 D-GN	335	Low Speed Cooling Fan Relay Control
50-52	-	-	Not Used
53	0.5 TN/WH	2500	High-Speed GMLAN Serial Data Bus (+)
54	-	-	Not Used
55	0.35 YE	410	ECT Sensor Signal
56	-	-	Not Used
57	0.35 RD/BK	380	A/C Refrigerant Pressure Sensor Signal
58	-	-	Not Used
59	0.5 L-GN	432	MAP Sensor Signal
60-65	-	-	Not Used
66	0.5 RD	381	Vehicle Speed Signal
67	-	-	Not Used
68	0.5 WH	5497	Cylinder Shutoff Solenoid Control 7
69	0.5 OG	5494	Cylinder Shutoff Solenoid Control 3
70-73	-	-	Not Used

Connector Part Information

OEM: 13579472
Service: See Catalog
Description: 73-Way F MX123 34566 Series (GY)

Terminal Part Information

Pins: 7, 10-12, 17, 21, 23, 29, 33, 35, 37, 39, 46, 48, 49, 53, 55, 57, 59, 66, 68, 69,
Terminal/Tray: 15359541/4
Core/Insulation Crimp: M/M
Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)