Courtesy Lamp: Description and Operation

This group includes lamps that may be manually turned on by placing the interior lamp switch in the ON position, or by opening a door.
^ The Roof Rail/Reading Lamps
^ The Dome Lamp
^ The Rear View Mirror Lamps

The dome lamp switch has three positions, DOOR, OFF and ON. When in the DOOR position, the dome lamp operation is controlled by the BCM. The ON position provides a ground for continuous operation. Ground is provided at G401. The OFF position turns off any dome lamp operation. The courtesy lamps, may be manually turned on by placing the IP dimmer switch in the DOME position. When the dome lamp switch is in the DOOR position, the dome lamp will illuminate when a door is opened. When a door is opened, the courtesy lamps turn on. After all the doors have been closed the courtesy lamps will remain illuminated approximately 10 seconds after the last door closes. When the driver places the dome lamp switch in the OFF position, the dome lamp will be disabled.

The INT LPS fuse in the Right Hand Instrument Panel (RH IP) junction block supplies battery positive voltage to the Body Control Module (BCM). The inadvertent power control circuit of the BCM supplies battery positive voltage to the Left Hand Instrument Panel (LH IP) junction block. The LH IP junction block supplies battery positive voltage to the left and right hand courtesy lamps and the dome lamp. When any door is opened, the door jam switch contacts close and the door open input to the BCM is grounded. Some of the courtesy lamps may also be used as reading lamps by placing the lamps switch in the ON or OFF position. The rear view mirror contains 2 map lamps. Each map lamp may be manually turned on or off using its own switch.

If the driver inadvertently leaves any interior lamp on the BCM will turn it off after 20 minutes.

The courtesy lamps will normally turn off using the theater dimming feature. The BCM provides a pulse width modulated ground to left and right hand courtesy/reading lamps and the dome lamp for the theater dimming feature. The courtesy lamps will also turn off immediately if a door lock command is received with all the doors closed, or if the ignition switch is turned to the ON position.