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Home › Buick › 2019 › Envision Base › Repair and Diagnosis › External Pages › Different car › Section 63 (Power Door Lock System And Release Systems) › Diagnostic Information and Procedures › DTC B153F - Liftgate Object Sensor Malfunction › Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Liftgate Secondary Obstacle Detection parameter is between 3-3.5 V.
    • If not between 3-3.5 V 

      Refer to Circuit/System Testing.

    • If between 3-3.5 V 
  3. Verify the scan tool Liftgate Secondary Obstacle Detection parameter is between 3-3.5 V and changes to 2.25-2.75 V as the B71R Liftgate Object Sensor - Right is pressed.
    • If not between 2.25-2.75 V or does not change 

      Test or replace the B71R Liftgate Object Sensor - Right.

    • If between 2.25-2.75 V and changes 
  4. Verify the scan tool Liftgate Secondary Obstacle Detection parameter is between 3-3.5 V and changes to 2.25-2.75 V as the B71L Liftgate Object Sensor - Left is pressed.
    • If not between 2.25-2.75 V or does not change 

      Test or replace the B71L Liftgate Object Sensor - Left.

    • If between 2.25-2.75 V and changes 
  5. All OK.
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