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 (BCM)
The Body Control Module (BCM) controls the interior lamps illumination.
One of the following 3 BCM types are installed on the vehicle based upon the vehicle equipment:
- BCM type 2
This provides the interior illumination control, inadvertent load (battery rundown) protection, chime functions and automatic power door locks.
- BCM type 3
This provides BCM type 2 features plus the keyless entry system (RPO AUO).
- BCM type 4
This provides BCM type 2 and 3 features plus the content theft deterrent (RPO UA6) with remote activation verification and the remote alarm.
For more information regarding the BCM, refer to Body Control System.
Use the Manual With the Right Hardware
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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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