2002 GMC Envoy Owner's Manual - Page 120

Battery Run-Down Protection This feature shuts off the dome, courtesy, vanity, reading, glove box and underhood lamps if they are left on for more than 20 minutes when the ignition is off. This will keep your battery from running down. If the battery run-down protection shuts off the interior lamps, it may be necessary to do one of the following to return to normal operation: Electrochromic Day/Night Rearview Mirror with Compass and OnStarR (If Equipped) D Shut off all lamps and close all doors, or D turn the ignition key to RUN. This feature will also turn off the parking lamps and headlamps under most circumstances, if they are left on. If you would like to turn them back on, turn the exterior lamps knob on. Your vehicle has an automatic-dimming rearview mirror with a compass and the OnStar system. Mirrors Adjust all the mirrors so you can see clearly when you are sitting in a comfortable driving position. This is the on/off button. There are three buttons for the OnStar system. See your dealer for more information on the system and how to subscribe to OnStar. See "OnStarR System" in the Index for more information about the services OnStar provides. 2-51