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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. Verify that DTC B1405 02 or B1405 05 is not set.
    • If DTC B1405 is set 

      Refer to Circuit System Testing: Voltage Reference Malfunction.

    • Go to next step: If DTC B1405 is not set 
  2. Verify the actual inside air temperature, using a thermometer, is less than a 3°C (5°F) difference from the scan tool Inside Passenger Compartment Air Temp. Sensor parameter
    • If greater than a 3°C (5°F) difference 

      Refer to Circuit System Testing: Sensor Circuit Malfunction

    • Go to next step: If less than a 3°C (5°F) difference 
  3. Verify the scan tool Sunload parameter changes while covering the B10B Ambient Light/Sunload Sensor with a shop towel and changes when shining a bright light on it
    • If the Sunload parameter does not change 

      Refer to Circuit System Testing: Sensor Circuit Malfunction

    • Go to next step: If the Sunload parameter changes 
  4. All OK.
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