2007 GMC Sierra 1500 Pickup Owner's Manual - Page 537

Center High-Mounted Stoplamp (CHMSL) and Cargo Lamp To replace one of these bulbs, do the following: 1. Remove the screws and lift off the lamp assembly. A. Cargo Lamp B. Center High-Mounted Stoplamp Bulb 2. Remove the back plate from the assembly by pressing the release tabs. 3. Remove the CHMSL bulb by pulling the bulb straight out from the holder back plate. Remove a cargo bulb by turning the socket counterclockwise and pulling the bulb straight out. 537