INSPECTION PROCEDURE A-4: Selector "P" Position-Linked Door Unlock Function Does Not Operate: 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.
ETACS-ECU determines whether the shift position is at "P" or not according to the shift position signal which is sent by CVT-ECU.