GM Service Manual Online
For 1990-2009 cars only

Assist Step Replacement Diamond Edition

Removal Procedure


    Object Number: 643464  Size: SH
  1. Remove 6 nuts and 3 U-bolts securing the assist step assembly to the mounting brackets.
  2. Remove the plastic end caps from the assist step assembly if required.
  3. 2.1. Remove the 3 screws from the assist step assembly.
    2.2. Remove the plastic end cap by pulling the cap straight out of the step assembly.
  4. Remove the plastic step pads if required by breaking the plastic pad from the assist step assembly.

Installation Procedure


    Object Number: 643464  Size: SH
  1. Install new plastic step pads to the assist step assembly by pressing the new pad into place.
  2. Install the plastic end cap to the assist step assembly.
  3. 2.1. Install the plastic end cap by pressing the cap straight into the assist step assembly.
    2.2. Install 3 screws into the step assembly.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the assist step assembly to the mounting brackets with 3 U-bolts and 6 nuts.
  5. Tighten
    Tighten the step assembly nuts to 20 N·m (15 lb ft).