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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 B1579 >> Circuit/System Verification

Circuit/System Verification

  1. Open the liftgate.
    2. NOTE:

    The K194 Rear Gate Module will only command the B70 Liftgate Close Switch to illuminate for 10 minutes after liftgate has been opened. Liftgate must be closed and opened to activate B70 Liftgate Close Switch backlight.

  2. Verify the B70 Liftgate Close Switch is illuminated
    • If not the specified state 

      Refer to Circuit/System Testing

    • Go to next step: If the specified state 
  3. All OK.
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