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.
Install the hook and loop seat belt retainer to the headliner.
Install the retractor side seat belt to the hook and loop on the headliner.
Fig 1: Installing Hook And Loop Seat Belt Retainer To Headliner