WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Front Seat Adjuster Knob
Courtesy of GENERAL MOTORS COMPANY
Callout
Component Name
1
Front Seat Adjuster Knob Procedure Use a flat-bladed tool to release the adjuster knob from the outer finish panel.