How do you remove a 1999 Cadillac STS factory radio?

To remove the factory radio from a 1999 Cadillac STS, start by disconnecting the negative battery cable to prevent any electrical issues. Next, use a flathead screwdriver to carefully pry off the trim panel surrounding the radio. Once the trim is removed, unscrew the mounting screws securing the radio in place. Finally, pull the radio out gently, disconnect the wiring harness and antenna cable, and the radio will be completely removed.