Inspection Procedure 5: The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control: Notes
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.
CAUTION:
Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.