Removal Procedure

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Open the rear lift window panel.
Using two flat bladed tools, CAREFULLY and simultaneously pry at the upper RH and LH edges of the rear radio speaker grille to release the locking tabs.

Fig 1: Push -In Fastener At Rear Compartment Speaker Grille
Courtesy of GENERAL MOTORS CORP.
Pivot the speaker grille downward to release the lower retaining tab, then remove the grille.
Remove the push -in fastener (in the lower corner of the speaker opening) retaining the rear compartment side trim panel.

Fig 2: Electrical/Audio Connector At Rear Speaker

Courtesy of GENERAL MOTORS CORP.

Remove the rear speaker retaining screws.
Finesse the rear compartment side trim panel carefully upward, rearward and outward slightly to access the upper speaker retaining screw.
Begin to remove the rear speaker in order to access the electrical/audio connector.
Disconnect the electrical/audio connector from the rear speaker.
Remove the rear speaker.