WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Sealing Strip (Rear Door Window Belt Outer)
Courtesy of GENERAL MOTORS CORP.
Remove the screw that retains the sealing strip to the door.
Lift upward on the forward edge of the sealing strip.
Remove the sealing strip from the pinch-weld flange.