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.
Use the J 38778
in order to remove the door sill trim plate from the vehicle.
Fig 1: Removing Lift Gate Door Sill Trim Plate From Vehicle