How do you change third brake light 1999 Toyota Avalon?

To change the third brake light on a 1999 Toyota Avalon, first, open the trunk and locate the access panel on the rear deck where the light is situated. Remove the screws or clips holding the panel in place, then carefully lift it out. Disconnect the wiring harness from the old light, replace it with a new bulb or assembly, and reconnect the wiring. Finally, reattach the access panel and secure it with the screws or clips.