Warning! When the vehicle is moving, the rear door or trunk lid must always be completely closed, since if it is open or slightly open, toxic exhaust gases may enter the vehicle interior.
To open the rear door or trunk lid, turn the key clockwise in the lock, then lift the rear door or trunk lid by hand.
Direction of turning the key to open the trunk lid lock
To close the tailgate or trunk lid, lower it down, then push it down until it locks into place. To make sure the tailgate or trunk lid is securely locked, try lifting it again.
(The article is copied from this website: «HyundaiBook»)