2006 GMC Sierra 1500 Pickup Owner's Manual - Page 478

Roof Marker Lamps To replace a roof marker lamp bulb, do the following: 1. Remove the two screws and lift off the lens. To replace a center roof marker lamp bulb, do the following: 2. Install a new bulb into the socket and turn clockwise until it locks into place. 1. Remove the six screws from the center roof marker lamp assembly. 2. Turn the old bulb counterclockwise to remove it from the socket. 3. Reinstall the lens and tighten the screws. 3. Reinstall the lens and tighten the screws. 5-66