Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Lower the rear of the headliner far enough to access the antenna module. Refer to HEADLINER REPLACEMENT (WITH SUNROOF) or HEADLINER REPLACEMENT (WITHOUT SUNROOF) .
Disconnect the electrical connectors from the radio antenna module.
Remove the fastener retaining the radio antenna module to the roof beam.
Remove the radio antenna module.

Fig 1: Removing Antenna Module
Courtesy of GENERAL MOTORS CORP.