Rear 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.

Rear fog lamps are installed on vehicles manufactured for certain markets where they are required. The rear fog lamp system includes a premium Body Control Module (BCM), a rear fog lamp relay installed in the Junction Block (JB), and a rear fog lamp switch integral to the left (lighting) control stalk of the multi-function switch. The rear fog lamps operate in concert with the front fog lamps. The rear fog lamps have a path to ground at all times through a take out and eyelet terminal of the rear body wire harness that is secured by a ground screw to the base of the right D-pillar behind the quarter trim panel.

The BCM controls rear fog lamp operation by monitoring the exterior lighting switch input from the multi-function switch, then energizing or de-energizing the rear fog lamp relay control coil and sending the appropriate electronic messages to the instrument cluster over the Programmable Communications Interface (PCI) data bus to control rear fog lamp indicator operation. When the rear fog lamp relay is energized, it provides battery voltage from a fused B(+) fuse in the JB to the rear fog lamps through the rear fog lamp relay output circuit. The BCM also provides a battery saver (load shedding) feature for the rear 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.