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 (Grand CHEROKEE)
Body Control Module (BCM) is located under left side of dash. BCM controls many of the vehicle's electrical functions and features by providing power or ground to a variety of systems. BCM contains a central processing unit and interfaces with other modules in the vehicle on the PCI data bus network.
BCM is the only module that has the capability of providing both "bias" and "termination" on the PCI bus system. See PCI BUS SYSTEM (GRAND CHEROKEE) . Systems are monitored by BCM through voltage drops.
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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.