Exterior Lighting System

EXTERIOR LIGHTING BATTERY SAVER
The BCM monitors the status of and controls the park lamp, head lamp and fog lamp relay's. If any exterior lamps are left on after the ignition is turned off, the BCM will turn them off after 8 minutes.

HEADLAMP DELAY
The headlamp time delay operates when the ignition switch is turned off while the headlamps are still on. This feature is customer programmable to provide a 30, 60 or 90 second time delay before turning off the headlamps. This feature can also be disabled.

HEADLAMP SWITCH
The headlight switch on WJ vehicles uses a multiplexed (MUX) circuit to the BCM. The BCM will then control the park lamp, low/high head lamp and fog lamp relay's based on this input.

FOG LAMP CONTROL
The body control module controls the operation of the fog lamp relay which controls the fog lamps. The fog lamps can only be on if the park or low beam headlamps are on. If the high beams are turned on, the fog lamps will automatically be turned off.