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.
Circuit/System Description
The front fog lamp switch is supplied with voltage from the instrument panel cluster (IPC) via the front fog lamp switch signal circuit. The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The front fog lamp switch signal circuit is grounded through the switch contacts of the front fog lamp switch to a common headlamp switch ground back to the IPC. The IPC interprets the flow of voltage and responds by sending a serial data message to the underhood electrical center (UEC). The UEC responds by applying ground to the front fog lamp relay control circuit energizing the front fog lamp relay coil. With the front fog lamp relay coil energized, the relay switch contacts close allowing battery voltage to flow from the front fog lamp fuse to the front fog lamp control circuit which illuminates the front fog lamps. The left front fog lamp receives ground at G101 and the right front fog lamp is grounded at G102.
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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.