Technical Description (Comment)
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 windshield wiper motor, the column switch (column-ECU) or ETACS-ECU may be defective. Check the wiper backup circuit (between the column switch WB/U and the ETACS-ECU WB/U), and repair if necessary.