How do you replace third brake light on 2001 Cadillac Seville sls?

To replace the third brake light on a 2001 Cadillac Seville SLS, you will first need to access the light by removing the trim panel on the rear deck lid. This may involve removing screws or clips holding the panel in place. Once the panel is removed, you can then access the back of the third brake light assembly, disconnect the wiring harness, and remove any mounting screws to take out the old light. Finally, install the new third brake light, reconnect the wiring harness, secure it with mounting screws, and reattach the trim panel.