Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Body Control Module
The various BCM input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The Body Control Module functions include the following:
- A/C compressor request. Refer to Air Temperature Description and Operation
- Remote Function Control. Refer to Keyless Entry System Description and Operation
- A/C cooling Fan. Refer to Air Delivery Description and Operation
- Audio Delay Power. Refer to Radio/Audio System Description and Operation
- Exterior and interior lighting control. Refer to Exterior Lighting Systems Description and Operation
- Daytime running lights (DRL)
- Automatic lighting control
- Fog lamps
- Interior lighting. Refer to Interior Lighting Systems Description and Operation
- Battery rundown protection (Inadvertent Power). Refer to Interior Lighting Systems Description and Operation
- Chimes. Refer to Audible Warnings Description and Operation
- Key-In-Ignition
- Head Lamps On
- Seat Belt Not Fastened
- Turn Signal On
- Park Brake Warning
- Door Ajar Warning
- Check gages
- Gage control. Refer to Instrument Panel Cluster (IPC) Description and Operation in Instrument Panel, Gages, and Console.
- Instrument cluster indicator control. Refer to Instrument Panel Cluster (IPC) Description and Operation in Instrument Panel, Gages, and Console.
- Theft deterrent. Refer to Theft Systems Description and Operation .
- Engine coolant level sensing. Refer to Cooling System Description and Operation .
- Washer solvent level sensing. Refer to Wiper/Washer System Description and Operation in Wipers/Washer Systems.
- Key-in-ignition sensing. Refer to Audible Warnings Description and Operation in Instrument Panel, Gages, and Console.
- Seat belt use sensing. Refer to Seat Belt System Description and Operation .
- Brake fluid level sensing.
- Parking brake state sensing.
- Rear compartment interface. Refer to Power Door Locks Description and Operation
- Horn interface.
- Door lock interface. Refer to Power Door Locks Description and Operation
- Bulb Check. Refer to Instrument Panel Cluster (IPC) Description and Operation in Instrument Panel, Gages, and Console.
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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.
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