DTC U0231: Rain light sensor LIN timeout < Vehicles with auto light function >: Notes
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.
CAUTION:
Before replacing the ECU, ensure that the communication circuit is normal.
Fig 1: Lighting Control Sensor LIN Communication Circuit Diagram