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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 B1574 or B1575 - Liftgate Interior Release Open/Close Switch Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On/Vehicle - In Service Mode
  2. Rotate the S45B Liftgate Control Switch - Interior to the Max setting
  3. Operate the component: S45B Liftgate Control Switch - Interior - Pressed

    Verify the Power Liftgate (TB5) performs the power open or the power close function

    • If the Power Liftgate (TB5) does not perform the power open or the power close function 

      Refer to Circuit/System Testing - Test 1

    • Go to next step: If the Power Liftgate (TB5) performs the power open or the power close function 
  4. Rotate the S45B Liftgate Control Switch - Interior to the Off setting

    Operate the component: E7AC Rear License Plate Lamp Module - Pressed

    Verify the Power Liftgate (TB5) power open function has been disabled

    • If the Power Liftgate (TB5) activates and performs the power open function 

      Refer to Circuit/System Testing - Test 2

    • Go to next step: If the Power Liftgate (TB5) power open function has been disabled 
  5. Rotate the S45B Liftgate Control Switch - Interior to the 3/4 setting

    Operate the component: E7AC Rear License Plate Lamp Module - Pressed

    Verify the Power Liftgate (TB5) power opens and stops at the garage mode position

    • If the Power Liftgate (TB5) only opens and stops at the full open position 

      Refer to Circuit/System Testing - Test 2

    • Go to next step: If the Power Liftgate (TB5) power opens and stops at the garage mode position 
  6. A fault is not currently present and may be an intermittent condition
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