WARNING: This page is about a different car, the 2007 Saturn Ion Red Line, 2007 Saturn Ion 3, and 2007 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Dome Lamp Bulb
Courtesy of GENERAL MOTORS CORP.
Remove the dome lamp lens by disengaging the side tabs with a small flat-bladed tool.