GMC Sierra Owners Manual
Pick-Up Box Identification and Fender Marker Lamps
The pick-up box identification lamps are LEDs. For replacement of the LED lighting assembly contact your dealer.
To replace a pickup box fender marker lamp bulb:
1. Press the tab from the back to remove the lamp.
2. Turn the bulb socket counterclockwise to remove from the lamp assembly.
3. Gently pry the bulb from the socket.
4. Install the new bulb in socket.
5. Reinstall socket into lamp assembly.
6. Reinstall the lamp assembly.