Speed Sensitive Wipers
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
When the wiper control is set on any intermittent setting except INT 1, the speed dependant wipers will automatically adjust with the vehicle speed. Vehicle speed is supplied to the wiper/washer module from the PCM. The wiper/washer module is hardwired to the PCM. This feature decreases the time between wipes when the vehicle speed increases.