WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Dome Lamp Lens
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
Dome Lamp Lens Procedure: Using nylon flat bladed tool release the four integral tabs on the lens from the roof console.