Courtesy/Illuminated Entry Lamps

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

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 cargo lamp

When the driver places the dome lamp defeat switch in the OFF position, the courtesy lamps, dome lamps and cargo lamp will be disabled. If the dome lamp defeat switch is in the ON position and the doors are unlocked using the key fob or if any door is opened, all of the courtesy lamps illuminate. After all the doors have been closed all of 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 LP 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 any door is opened or 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 G200. 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, rear audio control illumination and IP ash tray lamp are supplied battery positive voltage from the headlamp switch in the PARK or HEAD positions.

Grounds for these component lamps are supplied by the same ground that supports the individual switch function.