Rainsense Operation

With the wiper switch in AUTO DELAY (Rainsense), battery voltage is applied to the wiper motor through the ignition positive voltage circuit. Voltage is also applied through both wiper speed signal circuits. When the ignition switch is in RUN or ACCY, battery voltage is present in the ignition positive voltage circuit of the outside moisture sensor connector.

A Pulse-width-modulated (PWM) signal is sent from the wiper motor cover to the outside moisture sensor through CKT 482. The type of PWM signal sent is determined by which AUTO DELAY position is selected on the wiper/washer switch.

The outside moisture sensor then sends a PWM signal back to the wiper motor cover on CKT 481. The type of PWM signal is determined by the input from the wiper motor cover and the amount of rain sensed on the windshield. The wiper motor cover receives the signal from the outside moisture sensor and actuates the wiper motor accordingly.