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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> DTC B1578 - Liftgate Close Switch Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On/Vehicle - In Service Mode
  2. Verify the scan tool parameter: Rear Gate Close Switch = Inactive
    • If not the specified state 

      Refer to Circuit/System Testing

    • Go to next step: If the specified state 
  3. Operate the component: B70 Liftgate Close Switch - Pressed

    Verify the scan tool parameter: Rear Gate Close Switch = Active

    • If not the specified state 

      Refer to Circuit/System Testing

    • Go to next step: If the specified state 
  4. A fault is not currently present and may be an intermittent condition
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