Body Control Module (BCM) X3

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Body Control Module (BCM) X3 Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.8 BK/WH	1851	Ground (MEX)
2	0.8 RD/WH	2140	Battery Positive Voltage (Except HP2/8S8)
2	0.5 RD/WH	2140	Battery positive Voltage (HP2/8S8)
3	0.5 RD/WH	3840	Battery Positive Voltage
4	-	-	Not Used
5	0.8 BK/WH	1851	Ground (MEX)
5	1 BK/WH	1851	Ground (Except MEX)
6	-	-	Not Used
7	0.5 GY	728	Security Indicator Control (SPO Alarm)
8	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus (+)
9	0.5 TN	2501	High Speed GMLAN Serial Data Bus-
10	0.35 D-GN	5060	Low Speed GMLAN Serial Data
11	0.35 D-GN	44	Instrument Panel Lamp Dimmer Switch Signal
12	0.35 OG/WH	812	12-Volt Reference
13	0.35 PU	7062	Brake Switch Signal
14-15	-	-	Not Used
16	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus (+)
17	0.5 TN	2501	High Speed GMLAN Serial Data Bus-
18	0.35 YE	6817	LED Backlight Dimming Control
19	0.35 L-BU	5986	Serial Data Communication Enable (Except MEX)
20	-	-	Not Used
21	0.35 OG	192	Front Fog Lamp Switch Signal/Fog Lamps Enable (T96)
22	0.35 L-GN/WH	7158	Cruise Control Indicator Dimming Signal (Except MEX)
23-24	-	-	Not Used
25	0.35 PU/WH	6816	Indicator Dimming Control (Except MEX)

Connector Part Information

OEM: 15482791
Service: 88988840
Description: 25-Way F HIT Series (L-BU)

Terminal Part Information

Pins: 1-3, 5
Terminal/Tray: SNAC-A061T-M2.8/20
Core/Insulation Crimp: E/A
Release Tool/Test Probe: 12094429/J-35616-4A (PU)

Pins: 7-13, 16-19, 21, 22, 25
Terminal/Tray: SNAC3-A021T-M0.64/20
Core/Insulation Crimp: J/J
Release Tool/Test Probe: 12094429/J-35616-64B (L-BU)