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 a flat-bladed tool in order to remove the retainer clip.
Remove the lumbar adjustment handle from the seat bottom.
Fig 1: Removing Lumbar Adjustment Handle From Seat Bottom