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.
System Operation: BCMB
The BCMB controls various systems by monitoring inputs from switches, sensors and messages sent from other modules on the MS-CAN and from the GWM. Based on the inputs received, the BCMB activates outputs. For example, the BCM-B monitors the stoplamp switch and messages received from the BCM regarding ignition state and door ajar status. Based on this input, the BCMB may provide voltage to the stoplamps or activate the ambient lighting. For a list of BCMB controlled functions, Refer to: Module Controlled Functions - Overview .
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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.