Removal Procedure

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

Remove the center I/P air vents. Refer to HEATING, VENTILATION AND AIR CONDITIONING in HVAC.
Remove the HVAC programmer/ashtray assembly. Refer to HVAC CONTROL MODULE REPLACEMENT in HVAC Systems - Automatic.
Remove the 4 10 mm screws securing the radio to the I/P retainer.
Pull out the radio assembly.
Disconnect the electrical connectors.
Remove the radio from the vehicle.

Fig 1: Removing Radio
Courtesy of GENERAL MOTORS CORP.