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.
Lighting Control Module (LCM)
The LCM monitors the inputs and provides outputs and diagnostic information for the following multiple vehicle systems:
- Brake shift interlock
- Exterior lighting
- Interior lighting
- Perimeter alarm
The LCM receives a voltage input from the brake pedal position switch and provides power to the brake shift interlock solenoid. The LCM receives inputs and provides outputs to control the exterior and interior (including the cluster and panel illumination) lighting systems on the vehicle. The perimeter alarm is controlled by the LCM, which receives inputs from the perimeter alarm switches and arms the alarm when commanded.
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.