Fog Lamps - Rear

The rear fog lamps can be turned on by the rear fog lamp switch only when the headlamp switch is in the HEAD position or when both of the following conditions are present:
^ The front fog lamp switch is ON.
^ The park lamps are ON.

The headlamp switch supplies battery voltage to the rear fog lamp relay contacts when in the headlamp switch is in the PARK or HEAD position. The fog lamp relay coil receives battery voltage from 2 sources. First, from the front fog lamp switch when the front fog lamp switch is in the ON position. Second, from the headlamp switch when the headlamp switch is in the HEAD position.

When the rear fog lamp switch is placed in the ON position it sends a ground signal to the Body Control Module (BCM). When the BCM receives the fog lamp switch signal, the BCM will then pull low the rear fog lamp relay, energizing it.

When the rear fog lamp relay energizes, the relay contacts close and it supplies battery positive voltage to rear fog lamps. The fog lamps are grounded at G 105 and G 106.

The fog lamps will remain ON until one of the following actions occur:
^ The rear fog lamp switch is placed in the OFF position.
^ The headlamp switch is placed in the OFF position.
^ The headlamp switch is placed in the PARK position and the front fog lamp switch is placed in OFF.

The rear fog lamp switch indicator illuminates when it receives battery voltage from the rear fog lamps supply voltage circuit, during rear fog lamps illumination. The indicator is grounded at all times.