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 uses the SCP communications network for communication with the diagnostic tool and other modules on the SCP communications network. The LCM, instrument cluster, and the DDM share the SCP communications network termination responsibilities. The SCP communications bus may remain operational when one of the termination resistors is not present.
The LCM controls the vehicle systems:
- warning chimes
- exterior lighting
- interior lighting
- backlighting
- perimeter alarm (if equipped)
Check the SCP communications network circuits between the LCM C2145a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP communications network, damage to the DLC C251, or damage to the LCM C2145a.
For additional warning chimes information, refer to WARNING DEVICES .
For additional exterior lighting information, refer to EXTERIOR LIGHTING .
For additional interior lighting information, refer to INTERIOR LIGHTING .
For additional perimeter alarm information, refer to ANTI-THEFT - PERIMETER .
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.