Technical Description (Comment)
WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
The receiver antenna assembly receives the trunk signals from the keyless operation key, and sends them to KOS-ECU, and further to ETACS-ECU. Then the ETACS-ECU determines to actuate the trunk open function of the keyless entry system.