Technical Description (Comment)
WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
The reciever antenna assembly receives the trunk signals from the transmitter, and sends them to the WCM, and further to the ETACS-ECU. Then the ETACS-ECU determines to actuate the trunk open function of the keyless entry system.