Front Fog Lamps

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

Vehicles equipped with optional front fog lamps have a premium Body Control Module (BCM), a front fog lamp relay installed in the Junction Block (JB), a front fog lamp switch integral to the left control stalk of the multi-function switch, and the ElectroMechanical Instrument Cluster (EMIC). The front fog lamps have a path to ground at all times through their connection to the front fascia wire harness from two take outs with eyelet terminals that are secured by ground screws to the left inner fender shield in the engine compartment.

The BCM controls front fog lamp operation by monitoring the exterior lighting switch input from the multi-function switch, then energizing or de-energizing the front fog lamp relay control coil. The BCM also sends the appropriate electronic message to the EMIC over the Programmable Communications Interface (PCI) data bus to control operation of the front fog lamp indicator.

When the front fog lamp relay is energized, it provides battery voltage from a fused B(+) fuse in the JB to the front fog lamps through the front fog lamp relay output circuit. The BCM 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 with the ignition switch in the Off position. In certain markets where required, the front fog lamps are also turned off by the BCM whenever the headlamp high beams are selected. Each front fog lamp includes an integral adjustment screw to be used for static aiming of the fog lamp beams.