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.
Open the liftgate.
Release the clips that retain the garnish molding to the liftgate.
Remove the wire harness (1) from the slot located on the garnish molding.