Trouble Judgment
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
The LDW-ECU receives a signal from the LDW switch via CAN communication with the ETACS-ECU. When the ECU receives "ON" signal from the LDW switch for at least one minute consecutively, it determines that the system is defective.