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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> OnStar Button LED Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. 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.
  1. Vehicle in Service Mode/Ignition ON.
  2. Verify no DTCs are set.
    • Go to next step: If no DTCs are set 
  3. 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 
  4. 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 
  5. All OK.
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