WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Body Control Module (BCM) C3

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 638397-1 (AMP) 15383281 (Delphi) Service: See Catalog 18-Way F Unsealed (BK)
Pin	Wire Color	Circuit No.	Function
1-3	-	-	Not Used
4	L-BU/WH	1414	Left Turn Signal Switch Signal
5	L-BU	1714	Windshield Washer Switch Low Signal
6	D-BU	658	Cellular Telephone Voice Signal
7	WH	103	Headlamp Switch Headlamps On Signal
8	BN/WH	301	Park Lamp Switch On Signal
9	-	-	Not Used
10	L-BU	1872	Exterior Lamps Off Input
11	OG	192	Front Fog Lamp Switch Signal
12	PU	524	Headlamp Dimmer Switch High Beam Signal
13	PK	94	Windshield Washer Switch Signal
14	BN	1356	Flash To Pass Switch Signal
15	BK/WH	1251	Ground
16	TN	2144	Hazard Switch Signal
17	D-BU/WH	1415	Right Turn Signal Switch Signal
18	L-GN	1715	Windshield Washer Switch High Signal

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Body Control Module (BCM) C3

Use the Manual With the Right Hardware

When to See a Mechanic

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