Courtesy Lamps

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The courtesy lamps include the instrument panel courtesy lamps, the exterior courtesy lamps, and the rear view mirror lamps. Turn the courtesy lamps ON manually by placing the interior lamp switch in the DOME position, by opening a door or opening the trunk. 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 after the driver removes the ignition key.

The interior lights fuse supplies battery positive voltage to the BCM. The BCM then applies battery positive voltage to the courtesy lamps through the inadvertent power supply circuit. When any door or if the trunk is opened, the jam switch contacts close and the BCM receives a door-open or trunk open input. If the BCM receives a door lock or unlock input or an trunk open input, the BCM will activate the inadvertent power circuit, providing battery positive voltage to all of the IP courtesy lamps and the rearview mirror lamps. The BCM also provides a class 2 message signal to the driver door module and passenger door module to apply battery positive voltage to the exterior courtesy lamps. You may use some of the courtesy lamps as reading lamps by placing the lamp switch in the ON position.

The courtesy lamps will normally turn OFF using the theater dimming feature. The BCM provides a pulse width modulated ground to the courtesy/reading and inside rear view mirror lamps for the theater dimming feature. The BCM turns OFF the courtesy lamps if a door lock command is received after all of the doors are 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.