Circuit/System Verification

WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Contact the OnStar® Call Center first before pressing the emergency button in order to notify them of the test.

Ignition ON, press the OnStar® Call buttons one at the time. Verify that all of the OnStar® buttons operate normally.

If some OnStar® buttons are inoperative but not all, replace the inside rearview mirror.
If none of the OnStar® buttons operate, refer to circuit/system testing.