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)
HVAC Rear Defog Switch: The scan tool displays Active or Inactive. This data parameter is used for the HVAC system with C60. When the rear defogger switch is depressed, the scan tool will display Active. When the switch is depressed again, the scan tool will display Inactive.
Rear Defog Relay: The scan tool displays Active or Inactive. When the BCM energizes the RR DEFOG relay, the scan tool will display Active. When the BCM de-energizes the RR DEFOG relay, the scan tool will display Inactive.
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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.