WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Pull the sliding door opening weatherstrip from the sliding door pinch-weld flange.
Clean any adhesive form the pinch-weld flange.
Fig 1: Sliding Door Opening Weatherstrip & Pinch-Weld Flange