Fog/Driving Lamp: Description and Operation

FOG LAMPS

With the ignition switch in the ON position, and the park lamps or low beam headlights on, the fog lights will illuminate when the driver presses the fog lamp switch. The F/TNKDR fuse 32 in the instrument panel fuse block supplies battery positive voltage to the fog lamp switch contacts. Battery positive voltage may also by applied to the FOG LP relay 39. When the fog lamp switch is pressed, battery positive voltage is applied to the BCM. The BCM applies a ground to the FOG LP relay 39 coil circuit, which energizes the fog lamp relay coil control circuit. The current flow is now from the fog lamp relay to both front fog lamps and to ground G102 and to the fog lamp switch turning ON the fog lamp indicator. The state of the fog lamps either ON or OFF will remain the same until the front fog lamp switch is pressed again, or the ignition switch is cycled OFF and ON. The park lamps or low beam headlights must be ON in order for the fog lights to be illuminated. Fog lamp operation will be cancelled whenever the park lamps are turned OFF or when the high beam headlights are selected. The rear fog lamps are controlled in much the same way, however the front fog lamps must be ON in order to turn on the rear fog lamps. The rear fog lamps have their own relay, and both the relay and current flow are the same.