1995 GMC Sonoma Owner's Manual - Page 253

5. Pull the bulb out. 6. Push the new bulb into me soclcet. 7. Put the socket into the assembly turn the socket clockwise until it and locks in place. 8. Replace the assembly. Install and tighten the screws. 9. Close the tailgate. Center High Mounted Stop Lamp (CHMSL) 3. Remove the CHMSL bulb. I 6-35 4. Install the new CHMSL bulb. 5. Replace the CHMSL lens. Install and tighten the screws.