2001 GMC Sierra 1500 Pickup Owner's Manual - Page 389

Roof Marker Lamps 1. Remove the two screws and lift off the lens. The center roof marker lamps has six screws to remove. 4. If a CHMSL bulb is replaced, put the new bulb into the socket and press it in until it is tight. 5. If a cargo lamp is replaced, put a new cargo lamp bulb into the socket and press it in until it is tight before turning the socket counterclockwise. 6. Put the bulb holder back plate into the lamp housing. 7. Reinstall the lamp assembly and tighten the screws. 6-47