Light Bar 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.

The optional light bar (auxiliary off-road) lamps system the Body Control Module (BCM), the light bar switch on the instrument panel, and the ElectroMechanical Instrument Cluster. For all North American markets, the light bar switch receives battery voltage on a fused ignition switch output (run-start) circuit, which enables the switch to energize the lamps whenever the ignition switch is in the On or Start positions. For markets outside of North America, the light bar switch receives battery voltage from the park lamp relay in the Junction Block (JB) on the park lamp relay output circuit, and monitors an input from the low beam driver output circuit of the low beam relay in the JB, which enables the switch to energize the light bar lamps only with the park lamps On and the low beam headlamps Off.

The light bar lamps have a path to ground at all times through a take out and eyelet terminal of the instrument panel wire harness that is secured by a nut to a ground stud on the left instrument panel end bracket (left-hand drive) or the center of the instrument panel support structure (right-hand drive). The light bar switch controls light bar lamp operation by providing battery voltage from a fused B(+) fuse in the Power Distribution Center (PDC) to the lamps on the lightbar switch output circuit. When the lightbar switch output circuit is energized, the light bar switch also provides an input to the BCM on the lightbar switch sense circuit. The BCM then provides the appropriate electronic messages to the EMIC over the Programmable Communications Interface (PCI) data bus to control operation of the light bar indicator, the high beam indicator, or both indicators as required by the market for which the vehicle was manufactured.