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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Cellular, Entertainment, And Navigation - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Radio Malfunction >> Circuit/System Verification

Circuit/System Verification

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  1. Verify no DTCs are present.
    • Go to next step: If no DTCs are present 
  2. Verify the info display does not show this image with the following message- Update failed. Return to dealer.
    • GM5839313Courtesy of GENERAL MOTORS COMPANY

      If the Info Display does show the image/message. 

      Refer to Circuit/System Testing.

    • Go to next step: If the Info Display does not show the image/message. 
  3. All OK
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