Circuit/System Verification

NOTE:

If the green LED is off with the vehicle in Service Mode and the LED functions correctly 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 Circuit/System Testing - 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 Circuit/System Testing - Red LED Test
- If the red LED turns ON and OFF
All OK.