Inspection Procedure 3: The Luggage Compartment Light Does Not Illuminate Normally: Operation
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.
The ETACS-ECU illuminates and extinguishes the luggage compartment light in accordance with the input signals from liftgate lock actuator < vehicles without power liftgate > or liftgate latch < vehicles with power liftgate >.