Windshield Wiper Operation

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The smart junction box (SJB) supplies power to the multi-function switch from the SJB fuse 25 (20A) when the ignition switch is in the ON or ACC position. The multi-function switch supplies power to the windshield wiper motor for the HIGH or LOW/INTERMITTENT input, depending on the multi-function switch position selected. The SJB also supplies power directly to the windshield wiper motor from fuse 25 (20A) when the ignition switch is in the ON or ACC position for RUN/PARK operation. When the multi-function switch is in the LOW, HIGH or INTERMITTENT position, power is supplied to the windshield wiper motor, which moves the wipers off the PARK position. Once the wipers are off the PARK position, an internal switch in the windshield wiper motor switches to the RUN/PARK position which directs power to the wiper switch then back to the wiper motor. This maintains power to the windshield wiper motor to complete the wipe cycle. When the cycle is complete, the internal switch in the windshield wiper motor switches back to the PARK position. If the multi-function switch is in the LOW or HIGH position, power is supplied from the multi-function switch and another wipe cycle starts. If the multi-function switch is in the INTERMITTENT position, the windshield wipers remain parked until the internal relay in the multi-function switch supplies power to the windshield wiper motor. The internal relay supplies power after a time delay that is determined by the 1 of 9 intermittent switch settings.