How do you replace rear speaker in 2002 Cadillac deville?

To replace the rear speakers in a 2002 Cadillac DeVille, start by removing the rear seat cushion and the rear seat backrest to access the speaker area. Next, gently pry off the speaker grille to expose the screws holding the speaker in place. Disconnect the wiring harness and unscrew the old speaker, then install the new speaker by reversing the steps: connect the wiring, secure it with screws, and reattach the grille and seat components. Finally, test the new speakers before fully reassembling.