Front Fog Lamps

Vehicles equipped with optional front fog lamps include a front fog lamp switch integral to the headlamp switch on the instrument panel. The front fog lamps have a path to ground at all times through their connection to the Front End Module (FEM) wire harness and a takeout with an eyelet terminal that is secured to the body sheet metal.

Fog Lamp Activation 

• The headlamp switch needs to be in either park lamps or low beams before activating the front fog lamps.
• The headlamp switch is a momentary switch that sends an analog command to the BCM indicating that the fog lamps are selected, The BCM controls front fog lamp operation by providing a battery voltage output to the fog lamps through the right and left front fog lamp control circuits.
• The BCM also sends the appropriate electronic front fog lamp status messages to the Instrument Panel Cluster (IPC) to illuminate or extinguish the front fog lamp indicator.

Fog Lamp Dropout with High Beam Activation -  If the front fog lamps are active and the vehicle's high beams turn ON, then the front fog lamp outputs will turn OFF and the IPC indicator will also turn off and remain off until the high beams are turned OFF. If vehicle high beams are active and the front fog lamp command is operated, the IPC indicator will remain OFF. The BCM will keep track of a fog lamp request and honor the request when the high beams are turned OFF.

Battery Saver  - The BCM also provides a battery saver (load shedding) feature for the front fog lamps, which will turn these lamps OFF if they are left ON for more than about eight minutes when the status of the ignition switch is LOCK, if there is a charging system failure or if the electrical system voltage falls below about 11.75 volts for more than about 30 seconds.