Removal Procedure

WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Using a J 38778 release the retainer clips from the rocker panel.
Slide the carpet retainer rearward from the hinge pillar.
Disconnect the front carpet retainer from the center pillar garnish molding.
Remove the front carpet retainer.
If the clips come out of the carpet retainers, turn the plastic retainers 90 degrees in the hole in order to secure.

Fig 1: Identifying Front Carpet Retainer
Courtesy of GENERAL MOTORS CORP.