How do you replace 1999 Cadillac sts trunk light?

To replace the trunk light on a 1999 Cadillac STS, first, open the trunk and locate the light assembly. Carefully remove the lens cover by either twisting or gently prying it off, depending on the design. Replace the old bulb with a new one, ensuring it is securely seated, then reattach the lens cover. Finally, test the light to ensure it is functioning properly before closing the trunk.