Windshield Wipers
WARNING: This page is about a different car, the 2016 Ford Transit-350 HD, 2016 Ford Transit-350, 2016 Ford Transit-250, and 2016 Ford Transit-150. However, it is still accessible from the selected car via links, so may be relevant.
The windshield wipers operate only when the ignition is on.
The SASM monitors the wiper/washer switch inputs and sends the wiper/washer switch data to the BCM through a LIN (shared with the headlamp switch). Based on the input, the BCM activates the windshield wiper on/off relay (and the high speed wiper relay if for high speed wiper operation) to provide the requested operation.
The BCM also receives a second input through a fail-safe circuit from the SASM. This fail-safe circuit makes sure the windshield wipers function in the event a LIN communication failure occurs between the SASM and the BCM. If a failure occurs on this LIN, the wipers operate at LOW speed when the wiper/washer switch is in any position other than OFF.