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.
Pull the sliding door opening weatherstrip from the sliding door pinch-weld flange.
Clean any adhesive from the pinch-weld flange.
Fig 1: Pulling Sliding Door Opening Weatherstrip From Sliding Door Pinch-Weld Flange