2004 GMC Sonoma Owner's Manual - Page 296

Center High-Mounted Stoplamp (CHMSL) 4. Turn the harness bulb socket counterclockwise to remove it. Pull the bulb straight out to remove it from the socket. 5. Push the new bulb into the socket until it snaps into place. 6. Put the socket into the lamp assembly and turn it clockwise until it is tight. 7. To reinstall the assembly, snap the outboard end of the lamp assembly back into the vehicle. Then swing the assembly in and snap it into place. 8. Install the two retaining clips. 9. Close the hood. 5-52 1. Remove the lens retaining screws. 2. Remove the lens.