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Home >> Kia >> 2015 >> Optima EX >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Windshield Wiper/Washer System - Optima (Except HEV)) >> Rain Sensor >> Description And Operation >> System Function >> Basic Principle

Basic Principle

WARNING: This page is about a different car, the 2014 Kia Optima. However, it is still accessible from the selected car via links, so may be relevant.

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 separates optically, and the degree of remained beam is measured in the photo diode.

When there is water on the windshield, it means the beam is not reflected all, so the degree of lost beam indicates the degree of glass surface wet.

NOTE: Rain sensor consist of two luminosity diode, two photo diode, optic fiber and coupling pad.
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