2007 GMC Sierra 1500 Pickup Owner's Manual - Page 535

5. Press the locking release lever, turn the bulb socket counterclockwise and remove it from the turn signal assembly. 6. Remove the old bulb from the bulb socket. 7. Install a new bulb into the bulb socket. 8. Insert the bulb socket into the turn signal assembly and turn it clockwise until it locks. 9. Reinstall the turn signal assembly back into the vehicle placing the hook and posts on the inner side into the alignment holes first, then the outer side into the retainer bracket until you hear a click. 10. Reinstall the headlamp assembly. Roof Marker Lamps To replace a roof marker lamp bulb, do the following: 1. Remove the two screws and lift off the lens. 535