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Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  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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