Inspection Procedure 5: Keyless Entry System Does Not Work: Notes
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.
CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
Fig 1: Wireless Control Module System Input Signal Circuit Diagram