Moisture Sensitive Wipers

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The outside moisture sensor monitors moisture accumulation on the windshield and uses a windshield wiper/washer switch status input to provide wipe commands to the windshield wiper motor module. The windshield wiper/washer switch delay positions are used to activate the automatic operating mode and to adjust the level of sensitivity to moisture accumulation when commanding a wiper motor wipe cycle. The windshield wiper/washer switch is an input to the windshield wiper motor module.

The windshield wiper motor module sends the windshield wiper/washer switch status to the moisture sensor using a PWM voltage signal through the moisture sensor signal 1 circuit. The moisture sensor sends a PWM voltage signal to the wiper motor module through the moisture sensor signal 2 circuit whenever the ignition is in the accessory or run positions. The moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the moisture sensor and wiper motor module is lost, the wiper motor module will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.