Body Control Module (BCM) X3

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. 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 Color	Circuit	Function
1	0.8 BK/WH	1851	Ground
2	0.5 RD/WH	2140	Battery Positive Voltage
3	0.5 RD/WH	3840	Battery Positive Voltage
4	-	-	Not Used
5	1 BK/WH	1851	Ground
6-7	-	-	Not Used
8	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus +
8	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus + (HP2)
9	0.5 TN	2501	High Speed GMLAN Serial Data Bus -
9	0.5 TN	2501	High Speed GMLAN Serial Data Bus - (HP2)
10	0.35 D-GN	5060	Low Speed GMLAN Serial Data
11	0.35 D-GN	44	Instrument Panel Lamps Dimmer Switch Signal
12	0.35 OG/WH	812	12-Volt Reference or I/P Dimming Voltage Reference
13	0.35 PU	7062	Brake Pedal Switch Normally Closed Contact 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
20	-	-	Not Used
21	0.35 OG	192	Front Fog Lamp Switch Signal (T96)
21	0.5 D-BU/YE	6841	Not Used (PPV or 5W4)
22	0.35 L-GN/WH	7158	Cruise Control Indicator Dimming Signal
23-24	-	-	Not Used
25	0.35 PU/WH	6816	Indicator Dimming Control

Connector Part Information

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

Terminal Part Information

Pins: 1-5
Terminal/Tray: SNAC-A061T-M2.8/20
Core/Insulation Crimp: E/A
Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Pins: 6-25
Terminal/Tray: SNAC3-A021T-M0.64/20
Core/Insulation Crimp: J/J
Release Tool/Test Probe: 15315247/J-35616-64B (L-BU)