Technical Description (Comment)
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
If this does not work normally, the liftgate lock actuator < vehicles without power liftgate > or liftgate latch < vehicles with power liftgate > input circuit, luggage compartment light, or ETACS-ECU may have a problem.