WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Open the rear side door window.
Remove the rear side door window weatherstrip. Start the at butt joint and pull the weatherstrip from the window opening.