Circuit/System Verification

NOTE:

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

Ignition ON.
Verify the buttons operate normally by pressing each button individually.
- If none of the buttons operate normally
  Refer to Circuit/System Testing.
- If some, but not all, of the buttons operate normally
  Test or replace the A10 inside rearview mirror.
- If all of the buttons operate normally
All OK.