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.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the front fog lamp relay operates. Depress the switch for both the ON and OFF states. Repeat as necessary.
3. Tests for voltage at the coil side of the front fog lamp relay.
4. Verifies that the body control module (BCM) is providing ground to the front fog lamp relay.
5. Tests if ground is constantly being applied to the front fog lamp relay.
6. Tests if there is opposing voltage present or an open in the front fog lamp relay control circuit.
12. After replacement of the BCM you must calibrate the new module for proper operation.
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.