The Rain sensing windshield wiper system is a wiper system that, in addition to providing normal wiper functions off, mist, manual low speed, manual high speed, and wash, provides automatic control of automatic intermittent automatic low, and automatic high speeds.
When the ignition key is in the ON position, the rain sensor will be activated.
Emitted Beam from luminosity diode is reflected entirely against the windshield exterior, and then turn into photo diode.
If there is water on the windshield exterior, beam seperates optically, and the degree of remained beam is measured in the photo diode.
What there is water in the windshield, it means beam is not reflected all, so the degree of lost beam indicates the degree of glass surface wet.
Rainsensor consist of two luminosity diode, two photo diode, optic fiber and coupling pad.
Wiper ECU transmits the signal as a rainsesor, and then the rainsensor perceives the rainwater to transmit to the wiping order wiper ECU, wiper ECU controls the wiper motor according to the signal.
Rainsensor can misoperate according to behind condition
Measurement signal get feeble by the dust of measurement surface or all beam way surface (the surface of luminosity and photo diode, optic fiber, cupling pad, windshield copula glass surface).
The bubble on the windshield and the coupling pad contact surface.
The movement of coupling pad by vibration.
Damaged wiper blade.
In case that engine starts under wiper switch AUTO, rainsensor activates after once wiper operaion to inform the driver that the system is under AUTO.
In case that the rainsensor doesn't work or malfunction, it is needed manual wiper switch operation by the driver.
