WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Remove the retractor side seat belt from the hook and loop on the retainer.
Remove the hook and loop seat belt retainer from the headliner.
Fig 1: Removing Hook And Loop Seat Belt Retainer From Headliner