WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
Open the door.
Fig 1: Removing Rearview Mirror
Courtesy of GENERAL MOTORS CORP.
Using a small flat-bladed tool, remove the rearview mirror from the rearview mirror support and slide it back.