Courtesy Lamp: Description and Operation

COURTESY/ILLUMINATED ENTRY LAMPS

The second group include lamps that may be manually turned on or off by placing the dome lamp defeat switch in the ON or OFF position, by placing the interior lamp switch in the DOME position, or by opening a door.
- The courtesy lamps
- The dome lamps
- The stepwell lamps

When the driver places the dome lamp defeat switch in the OFF position, the courtesy lamps, dome lamps and stepwell lamps will be disabled. If the dome lamp override switch is in the ON position and an outside front door handle is lifted or a front, side, or rear (cargo doors only) door is opened, the courtesy lamps illuminate. If the vehicle is equipped with a liftglass and dutch doors, the courtesy lamps will not illuminate when these are opened. After all the doors have been closed the courtesy lamps will remain illuminated approximately 20 seconds after the last door closes. The Body Control Module (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 RUN or START position.

The CTSY fuse in the IP fuse block supplies battery positive voltage to the inadvertent power relay coil and supply circuit. The BCM supplies ground to activate the inadvertent power relay to supply all interior courtesy lamps and the courtesy lamp relay with supply voltage. When a courtesy lamp request input is received by the BCM, the BCM will energize the courtesy lamp relay. The normally open courtesy lamp relay switch closes, grounding the courtesy lamp circuit to G110. Some of the courtesy lamps may also be used as reading lamps by placing the lamp switch in the ON or OFF position.

The driver and passenger door control switch illumination and rear audio control illumination are supplied battery positive voltage from the headlamp switch in the PARK or HEAD positions. Grounds for these component lamps are supplied by G200 for the RH door switches, G110 for the LH door switches and G107 for the rear audio controls.