Intermittent Wipe Mode
WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
When the rear wiper switch is pressed to the left, the instrument cluster sends an electronic wiper switch message to the FCM, then the FCM electronic wipe logic circuit responds by selecting a predetermined length of time between wiper sweeps.