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.
Pull down on the assist handle in order to expose the retaining screws (1).
Remove the assist handle screws (1).
Remove the assist handle.
Fig 1: Removing Procedure Of Assist Handle (Rendezvous)