Inspection Procedure 6: Keyless Entry Hazard Light Answerback Function, The Dome Light Answerback Function Or The Horn Answerback Function Does Not Work Normally: 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.