Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Remove the rear seat cushion. Refer to SEAT CUSHION REPLACEMENT - REAR in Seats.
Remove the rear seat back. Refer to SEAT BACK REPLACEMENT - REAR in Seats.
Disconnect the radio amplifier electrical connectors (2).
Remove the fasteners retaining the radio amplifier to the mounting bracket.
Lift the radio amplifier to remove.

Fig 1: Removing Radio Amplifier
Courtesy of GENERAL MOTORS CORP.