WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Rear Door Trim Panel Applique Assembly
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
Rear Side Door Trim Panel Applique Tip:
Use a small flat-bladed tool to release the retainers.