Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Use a flat-bladed tool in order to pry the door sill plate.
Remove the sill plate from the vehicle.

Fig 1: Door Sill Plate (Rear)
Courtesy of GENERAL MOTORS CORP.