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Home › Buick › 2021 › Envision Preferred, AWD › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Vehicle Access System › Diagnostic Information and Procedures › DTC B1576 - Liftgate Object Sensor Malfunction › Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool Rear Gate Anti-Pinch Sensor Voltage Raw Value parameter is between 3 V-3.5 V.
    • If not between 3 V-3.5 V 

      Refer to Circuit/System Testing.

    • Go to next step: If between 3 V-3.5 V 
  3. Verify the scan tool Rear Gate Anti-Pinch Sensor Voltage Raw Value parameter is between 3 V-3.5 V and changes to 2.25-2.75 V as the B71R Liftgate Side Sensor - Right is pressed.
    • If not between 2.25-2.75 V or does not change 

      Test or replace the B71R Liftgate Side Sensor - Right.

    • Go to next step: If between 2.25-2.75 V and changes 
  4. Verify the scan tool Rear Gate Anti-Pinch Sensor Voltage Raw Value parameter is between 3 V-3.5 V and changes to 2.25-2.75 V as the B71L Liftgate Side Sensor - Left is pressed.
    • If not between 2.25-2.75 V or does not change 

      Test or replace the B71L Liftgate Side Sensor - Left.

    • Go to next step: If between 2.25-2.75 V and changes 
  5. A fault is not currently present and may be an intermittent condition
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