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Home >> Buick >> 2017 >> Cascada Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U18B9-U18BF >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON/Vehicle In Service Mode.
  2. Verify DTC U18B9-U18BF is not set.
    • If DTC U18B9-U18BF is set without other DTCs set 
    1. Program the device that sets the DTC.
    2. Ignition/Vehicle OFF, remove the scan tool, open and close the driver door. Wait 60 s.
    3. Ignition ON/Vehicle In Service Mode.
    4. Verify the DTC does not set.
      • If the DTC sets, replace the appropriate device.
      • Go to next step: If the DTC does not set
    5. All OK.
    • Go to next step: If DTC U18B9-U18BF is not set 
  3. All OK
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