2002 GMC Sonoma Owner's Manual - Page 122

Battery Rundown Protection This feature shuts off the dome, courtesy, vanity, reading, glove box, cargo 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 rundown protection shuts off the interior lamps, it may be necessary to do one of the following to return it to normal operation: Mirrors Inside Day/Night Rearview Mirror Pull the tab under the mirror toward you to reduce glare from headlamps behind you after dark. Push the tab away from you for normal daytime operation. D Shut off all lamps and close all doors, or D turn the ignition key to RUN. Electrochromic Day/Night Inside Rearview Mirror (If Equipped) This mirror automatically changes to reduce glare from headlamps behind you. A photocell on the back of the mirror senses when it is becoming dark outside. Another photocell built into the mirror surface senses when headlamps are behind you. 2-52