Circuit/System Verification

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.
Verify no DTCs are set.
- If any DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- 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 Green LED Test
- 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 Red LED Test
- If the red LED turns ON and OFF
All OK.