WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Remove the screw that retains the sealing strip to the door.
Lift upward on the rear edge of the sealing strip.
Remove the sealing strip from the pinch-weld flange.
Fig 1: Removing Screw Retaining Sealing Strip To Door - Front Door Window Belt Outer