The rear hatch lock does not work with the remote.
Ensure the rear hatch opens with the outer and inner handles. If so then the problem exists in the remote transmitter as long as the other remote functions work lock/unlock. As long as you are sure the lock or unlock button works from the remote, you can test the transmitter by depressing and holding the the panic button for one second. The panic alarm will go off. You should be able to disarm the panic alarm by depressing and holding the rear hatch button for 3 seconds and then by inserting the key in the ignition. If you cannot get the panic alarm to disarm with the rear hatch button, then depress one of the other buttons for 3 seconds and insert key in the ignition to clear the panic alarm and get a new key remote from your local dealer.
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