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 body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. Some BCM functions with the subsystems may be as a gateway only or as an enable for the system. The BCM related systems/subsystems include, but are not limited to the following:
- Antilock brake system (ABS)-Refer to ABS Description and Operation (with StabiliTrak) or ABS Description and Operation (without StabiliTrak) .
- Automatic day-night mirror-Refer to Automatic Day-Night Mirror Description and Operation .
- Cruise control system-Refer to Cruise Control Description and Operation .
- Exterior lighting-Refer to Exterior Lighting Systems Description and Operation .
- Horn system -Refer to Horns System Description and Operation .
- Instrument cluster indicator control-Refer to Instrument Cluster Description and Operation .
- Interior lighting-Refer to Interior Lighting Systems Description and Operation .
- Power door lock system -Refer to Power Door Locks Description and Operation .
- Rear window defogger system -Refer to Rear Window Defogger Description and Operation .
- Remote function actuation (RFA) control-Refer to Keyless Entry System Description and Operation .
- Retained accessory power (RAP)-Refer to Retained Accessory Power Description and Operation .
- Shift lock control system -Refer to Automatic Transmission Shift Lock Control Description and Operation .
- Starting system-Refer to Starting System Description and Operation .
- Supplemental inflatable restraint (SIR) system -Refer to SIR System Description and Operation .
- Theft deterrent-Refer to Immobilizer Description and Operation .
- Wiper/Washer system functions-Refer to Wiper/Washer System Description and Operation (Wiper and Washers) .
NO RELATED
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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.