Body Control Module (BCM) X3

WARNING: This page is about a different car, the 2008 Cadillac CTS. 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	351	Ground
2	0.8 OG	1240	Battery Positive Voltage
3	0.8 OG	1140	Battery Positive Voltage
4	-	-	Not Used
5	0.8 BK/WH	351	Ground
6	-	-	Not Used
7	0.35 GY	728	Security Indicator Control (UA2)
8	0.5 TN/WH	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 Lamps Dimmer Switch Signal
12	0.35 RD/WH	812	12-Volt Reference or IP Dimming Voltage Reference
13	0.35 L-GN	526	Stop Lamp Switch Signal
14	0.35 BK	552	Low Reference
15	0.35 GY	598	5-Volt Reference
16	0.5 TN/WH	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
20-21	-	-	Not Used
22	0.35 GN/WH	7158	Cruise Control Indicator Dimming Signal
23-24	-	-	Not Used
25	0.35 WH	901	IC 2 Control (TSQ)

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: 15315247/J-35616-4A (PU)

Pins: 7-19, 22, 25
Terminal/Tray: SNAC3-A021T-M0.64/20
Core/Insulation Crimp: J/J
Release Tool/Test Probe: 15315247/J-35616-64B (L-BU)