Using scan tool (M.U.T-III), read the diagnostic trouble code.
(1) Clear all the DTC set in the power liftgate control unit.
(2) Operate the power liftgate.
(3) Check whether a DTC is set in the power liftgate control unit.
Is the DTC set?
Replace the power liftgate control unit. Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)