Removal Procedure

Remove the rear window trim panel. Refer to TRIM PANEL REPLACEMENT - REAR WINDOW SHELF
Remove the rear seat sound barrier. Refer to SOUND BARRIER REPLACEMENT - REAR SEAT BACK
Use the J 38778 in order to remove the audio amplifier push-in retainers.

Fig 1: Remove Rear Window Trim Panel, Rear Seat Sound Barrier & Audio Amplifier Push-In-Retainers
Courtesy of GENERAL MOTORS CORP.
Lift the audio amplifier from the rear shelf.
Disconnect the electrical connectors from the audio amplifier.
Remove the audio amplifier.

Fig 2: Remove Audio Amplifier & Electrical Connectors
Courtesy of GENERAL MOTORS CORP.