2005 GMC Safari Owner's Manual - Page 263

4. Press the tab and turn the socket counterclockwise to remove the socket from the bezel. If the socket does not have a tab, turn the socket counterclockwise to remove the socket from the bezel. 3. Pull out the taillamp assembly so you can see the socket. 5. Remove the old bulb from the socket and replace it with a new one. 6. Reverse Steps 1 through 4 to reinstall the taillamp. 5-55