Fog/Driving Lamp: Description and Operation

Fog Lamps

With both the ignition switch in the RUN position, and the park lamps or low beam headlamps on, the fog lights and indicators will illuminate when the driver presses the fog lamp switch. The FOG LP fuse in the engine wiring harness junction block supplies battery positive voltage to the fog lamp relay for the fog lamp supply voltage circuit. The park lamp relay supplies battery positive voltage to the fog lamp relay coil. With the headlamp switch in either the park or headlamp position, and the fog lamp switch is pressed, a ground signal from G203 is sent to the body control module (BCM) requesting to ground the fog lamp relay control circuit energizing the relay. The current flow is from the fog lamp relay to both front fog lamps and to grounds G111 and G112. The state of the fog lamps will remain the same until the fog lamp switch is pressed again, or the ignition switch is cycled OFF and ON. Fog lamp operation will be cancelled whenever the park lamps, are turned OFF or the high beam headlights have been selected.