Windshield Wipers

WARNING: This page is about a different car, the 2017 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The wiper relay, integrated into the BJB, is energized when the ignition is on providing voltage to the windshield wiper motor assemblies, the rain sensor (if equipped), and the rear window wiper motor assembly.

The SCCM monitors the wiper/washer switch inputs and sends the wiper/washer switch data to the driver side windshield wiper motor assembly through a LIN. The driver side windshield wiper motor assembly then synchronizes wiper operation with the passenger side windshield wiper motor assembly (using an isolated communication circuit between them) to prevent interference, or out-of-phase operation between the windshield wiper motor assemblies while they are cycling. The driver side windshield wiper motor assembly is the primary wiper motor and controls the operation of both windshield wipers.

Based on the input, the driver side windshield wiper motor assembly activates the appropriate wash, low, high and intermittent or rain sense modes. The logic for wiper system operation is a function of the ECU in the driver side windshield wiper motor assembly.

When the wiper/washer switch is in the high speed setting, the driver side windshield wiper motor assembly also receives a ground signal directly from the SCCM (bypassing the logic within the module). This fail-safe circuit makes sure the windshield wipers function in high speed mode in the event of a LIN communication failure.