2012 GMC Sierra Owner's Manual - Page 427

Vehicle Care 4. Install a new bulb into the socket, turn it clockwise, and press it in until it is tight. 5. Reinstall the lens and the four screws. To replace one of these bulbs: 1. Open the tailgate. See Tailgate on page 2‑10 for more information. 10-41 3. Turn the bulb socket counterclockwise to remove it from the taillamp assembly. 4. Pull the old bulb straight out from the socket. 5. Press a new bulb into the socket and turn the socket clockwise into the taillamp assembly. 6. Reinstall the taillamp assembly. Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps A. Stoplamp/Taillamp/Turn Signal Lamp B. Back-up Lamp 2. Remove the two rear lamp assembly screws near the tailgate latch strikerpost and pull rearward until disengaging the two outer pins on the taillamp assembly from the vehicle.