OnStar Button Assembly Replacement
WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The OnStar button assembly located on the rearview mirror can not be serviced separately from the rearview mirror. Should the button assembly need to be replaced, the entire rearview mirror assembly will need to be replaced. Refer to Inside Rearview Mirror Replacement .