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Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 GMC Yukon XL, 2015 GMC Yukon, 2015 Chevrolet Tahoe, 2015 Chevrolet Suburban, and 2015 Cadillac Escalade ESV. 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. Ignition ON.
  2. Verify no DTCs are set.
    • If no DTCs are set 
  3. Verify that the green indicator turns ON and OFF when commanding the green indicator ON and OFF with a scan tool.
    • If the green indicator does not turn ON and OFF 

      Refer to Circuit/System Testing - Green Indicator Test

    • If the green indicator turns ON and OFF 
  4. Verify that the red indicator turns ON and OFF when commanding the red indicator ON and OFF with a scan tool.
    • If the red indicator does not turn ON and OFF 

      Refer to Circuit/System Testing - Red Indicator Test

    • If the red indicator turns ON and OFF 
  5. All OK.
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