Circuit/System Verification

WARNING: This page is about a different car, the 2018 Buick Envision. 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/vehicle in Service Mode.
Verify no DTCs are set.
- If any DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTCs are set
Verify that each button of the S51 Telematics Button Assembly operates 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 S51 Telematics Button Assembly.
- Go to next step: If all of the buttons operate normally
All OK.