Installation Procedure

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

Install the assist step retainer to the rocker panel. The right side is a one piece retainer, the left side is a two piece retainer.
1. 1.1. Clean the rocker panel with isopropyl cleaner or equivalent to remove all of the old double back tape.
2. 1.2. Remove the strip from the double sided adhesive tape.
3. 1.3. Align the assist step retainer to the rocker panel and press firmly in place.
  
  Fig 1: Installing Assist Step Retainer Screws
  Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the assist step retainer screws to the rocker panel.
Tighten

Tighten the assist step retainer screws to the rocker panel to 2 N.m (18 lb in).
Install the assist step extensions. Refer to ASSIST STEP REPLACEMENT .
Lower the vehicle.