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Home › Cadillac › 2021 › CT4 V, 4WD › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Vehicle Access System › Diagnostic Information and Procedures › DTC B13DF › Circuit/System Verification

Circuit/System Verification

  1. Ignition - On/Vehicle - In Service Mode
  2. Engage the child door locks by pressing the child lock switch on the S79D Front Side Door Window Control Switch-Driver

    Verify the correct operation:

    • Interior Door Handle @ Left Rear Door = Disabled
    • Interior Door Handle @ Right Rear Door = Disabled
    • If the component does not work as specified 

      Refer to: Circuit/System Testing

    • Go to next step: If the component works as specified 
  3. Disengage the child door locks by pressing the child lock switch on the S79D Front Side Door Window Control Switch-Driver

    Verify the correct operation:

    • Interior Door Handle @ Left Rear Door = Enabled
    • Interior Door Handle @ Right Rear Door = Enabled
    • If the component does not work as specified 

      Refer to: Circuit/System Testing

    • Go to next step: If the component works as specified 
  4. A fault that is not currently present may have been caused by a intermittent condition.
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