Circuit/System Verification

WARNING: This page is about a different car, the 2015 Buick LaCrosse. 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.

Ignition ON.
Verify no DTC are set.
- If any DTC are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- If no DTC 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.