Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Remove the rear quarter trim. Refer to TRIM PANEL REPLACEMENT -- REAR QUARTER LOWER (AZTEK) or TRIM PANEL REPLACEMENT -- REAR QUARTER LOWER (RENDEZVOUS) .
Remove the speaker bolts.
Disconnect the electrical connectors from the speaker.
Remove the speaker.

Fig 1: Disconnecting Electrical Connectors From Speaker
Courtesy of GENERAL MOTORS CORP.