WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Open the endgate.
Support the endgate in the open position.
Remove the bolts from the endgate support cable.
Remove the endgate support cable from the endgate.
Fig 1: Removing Procedure Of Support Cable Replacement - End Gate