Fog/Driving Lamp: Description and Operation

FOG LAMPS

The PARK LP fuse and the FOG LP fuse supply battery voltage to the headlamp switch and the fog lamp relay contacts. When the headlamp switch is in HEAD or PARK and the driver presses the fog lamp switch, voltage is applied to the fog lamp relay coil. The fog lamp relay coil is grounded through the high beam headlamp filaments. The relay energizes and applies voltage to the fog lamps through the fog lamps supply voltage circuit. Because the coil of the FOG LAMP relay is grounded through the high beam filaments, the relay will de-energize any time the high beams are ON. The fog lamps can also be activated with the headlamp switch OFF, during automatic headlamp operation. When the automatic headlamps are on, the DRL control module applies voltage to the fog lamp switch and to the exterior lights.

REAR FOG LAMPS (EXPORT)

The rear fog lamp module requires the headlamps to be ON in order to turn ON the rear fog lamps. The HEADLAMP circuit breaker an RR FOG LP fuse provide battery voltage to the headlamp switch and rear fog lamp relay. When the headlamps are on, battery voltage is applied to the rear fog lamp module. The rear fog lamp switch is a momentary contact switch that, when pressed, provides a ground signal to the rear fog lamp module. When the rear fog lamp module receives the fog lamp switch ON input from the fog lamp switch and the headlamps are ON, the rear fog lamp module energizes the rear fog lamp relay. When energized the rear fog lamp relay provides battery voltage to the rear fog lamps. If the rear fog lamp switch is pressed again, the rear fog lamp module will de-energize the rear fog lamp relay. If the headlamps are turned OFF while the rear fog lamps are on, the rear fog lamps will turn off. If the headlamps are turned back ON, the rear fog lamps will not turn on unless the rear fog lamp switch is pressed again.