2008 GMC Sierra 1500 Pickup Owner's Manual - Page 366

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. Center High-Mounted Stoplamp (CHMSL) and Cargo Lamp To replace one of these bulbs: A. Cargo Lamp B. Center High-Mounted Stoplamp Bulb (CHMSL) 2. Remove the CHMSL and Cargo bulbs by turning socket counterclockwise and pulling the bulb straight out. 3. Install the CHMSL and Cargo bulbs by pushing the bulb straight in and turning clockwise. 4. Reinstall the lamp assembly and tighten the screws. 1. Remove the screws and lift off the lamp assembly. 5-54