Moisture Sensitive Wipers

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. 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 provides an input to the windshield wiper motor module. If no moisture is detected, the wipers will not operate in the DELAY modes. The windshield wiper switch signal 1 circuit is 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 moisture sensor sends a PWM voltage signal to the wiper motor module through the moisture sensor signal 1 circuit whenever the ignition is in the accessory or run positions. If at anytime the moisture sensor signal 1 circuit PWM voltage signal input to the wiper motor module is lost, the wiper motor module will use the input from the windshield wiper switch signal 1 circuit to operate the wiper motor at continuous variable delay intervals.