2000 GMC Sierra 1500 Pickup Owner's Manual - Page 132

yellowblue position, the dome lamps will remain off when the doors are open. To return the lamps to automatic operation, press the button again and return it to the "out" position. With the button in this position, the dome lamps will come on when you open a door. Battery Run-Down Protection This feature shuts off the dome, reading, glove box, cargo and underhood lamps if they are left on for more than 40 minutes when the ignition is off. This will keep your battery from running down. Cargo Lamp Press the button to turn the cargo lamp on. Press the button again to turn it off. Mirrors Inside Day/Night Rearview Mirror A message in the instrument cluster will come on and display CARGO LAMP ON when the cargo lamp is turned on and the ignition key is turned to RUN. 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. 2-54