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 communication circuit is normal.
Fig 1: Power Window Main Switch LIN Circuit Diagram
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 2: Locating Power Window Main Switch Connectors