Courtesy Lamp: Description and Operation

COURTESY LAMPS
The courtesy lamps, include the roof rail/reading lamps, the footwell lamps, dome and rear view mirror lamps. The courtesy lamps, may be manually turned on by placing the interior lamp switch in the DOME position, or by opening a door. After all the doors have been closed the courtesy lamps will remain illuminated approximately 15 seconds after the last door closes. The courtesy lamps will also turn on prior to any door being opened, and remain illuminated approximately 30 seconds when the driver removes the ignition key.

The BCM L fuse in the console fuse block, supplies battery positive voltage to the body control module (BCM). The courtesy lamps supply voltage circuit of the BCM supplies battery positive voltage to all interior courtesy lamps. When any door is opened the door open switch contacts close and a door open input is received by the BCM. If a door lock or unlock input is received by the BCM, it will activate the inadvertent power relay inside of the BCM, providing battery positive voltage to all interior courtesy lamps. Some of the courtesy lamps may also be used as reading lamps by placing the lamps switch in the ON or OFF position.

The courtesy lamps will normally turn off using the theater dimming feature. The BCM provides a pulse width modulated ground to all courtesy/reading, dome and inside rear view mirror lamps for the theater dimming feature. The BCM will immediately turn off the courtesy lamps if a door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position. The courtesy lamps will also turn on after an air bag deployment for approximately 15 seconds.