WIPER AND WASHER SYSTEM


  1. CONSTRUCTION


    1. The rain sensor consists of a Light Emitting Diode (LED) that emits infrared rays, a photo diode that can receive those rays, a lens and rain sensor tape.

      Tech Tips

      If the rain sensor tape has been peeled off during a windshield glass replacement, make sure to affix new rain sensor tape. Failure to do so will lead to a system malfunction.

    2. In order to enhance the responsiveness of the day/night control and the tunnel control, the 2 built-in light sensors have been provided.

      A00YY8EC01
      *1 Rain Sensor Tape *2 Lens
      *3 Photo Diode *4 LED
      *5 Photo Diode for Forward Detection (Light Sensor) *6 Photo Diode for Upward Detection (Light Sensor)

    3. If no raindrops are present in the detection area, the infrared rays emitted by the LED are all reflected from the outer surface of the windshield glass and are received by the photo diode.

    4. If raindrops are present in the detection area, a portion of the emitted infrared rays will penetrate the windshield glass due to the change in the difference of the index of refraction between the glass and the area outside the windshield (difference between air and water). The ability of the windshield glass to reflect all light back inside changes due to the presence of raindrops. This change of internal reflection due to the presence of water reduces the amount of infrared rays that are received by the photo diode. The amount of this reduction is then used to determine the amount of raindrops. This function then selects intermittent, low, or high wiper operation in order to operate the wipers at an optimal speed and timing.

    5. By using 2 light sensors, the sensitivity to detect night has been improved. In addition, when a tunnel is detected, the responsiveness around the entrance/exit of the tunnel has been improved.

      A00YY0JC01
      *1 Windshield Glass *2 Photo Diode
      *3 LED - -
      *a Infrared Ray *b Raindrop

  2. FAIL-SAFE


    1. If the windshield wiper relay assembly detects a malfunction of the rain sensor during the operation of the raindrop sensing function, the following controls will be performed:


      • Continuously performs wiper operation prior to the occurrence of a malfunction.

      • Switches to intermittent operation if a malfunction of the rain sensor is detected when the ignition switch is turned from off to ON or the windshield wiper switch assembly is in AUTO position.