Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Am and 2003 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.

Remove the rear compartment lamp housing for access. Refer to REAR COMPARTMENT LAMP REPLACEMENT in Lighting Systems.
Look for the mounting tabs just to the right of the center access hole on the rear package shelf. Compress the tabs and slide the receiver down through the access hole.
Disconnect the electrical connector from the remote door lock receiver.
Remove the remote door lock receiver.

Fig 1: Disconnecting Electrical Connector From Remote Door Lock Receiver
Courtesy of GENERAL MOTORS CORP.