Take care to not let the liftgate fall on you as the lifts are removed. Have a helper hold the liftgate open, or use a secure method to hold it open.
Using a screwdriver, lift up slightly the socket clips (A) of both ends on the power liftgate drive unit (B), and then remove the power liftgate drive unit from the bracket.
Courtesy of HYUNDAI MOTOR AMERICA
To install, reverse removal procedure.
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Make sure the lift gate locks and opens properly and locks securely.