Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If the green LED is off with the ignition ON and the LED does not function when commanded with the scan tool, contact the OnStar Center to confirm the vehicle has a current subscription.

Vehicle in Service Mode/Ignition ON.
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 the green LED turns ON and OFF when commanding the Green Indicator ON and OFF with a scan tool.
- If the green LED does not turn ON and OFF
  Refer to Circuit/System Testing - Green LED Test
- Go to next step: If the green LED turns ON and OFF
Verify that the red LED turns ON and OFF when commanding the Red Indicator ON and OFF with a scan tool.
- If the red LED does not turn ON and OFF
  Refer to Circuit/System Testing - Red LED Test
- Go to next step: If the red LED turns ON and OFF
All OK.