WIPER AND WASHER SYSTEM Rain Sensor Circuit

DESCRIPTION

The auto wiper system adjusts the wiper speed to optimum speed based on the amount of rain. The rain sensor mounted on the windshield detects rainfall. This system operates when the windshield wiper switch is set to AUTO. The rain sensor sensitivity can be adjusted with the rain sensor adjusting switch. Signals are sent to the front controller from the windshield wiper switch through the CAN line, and from the rain sensor through the LIN line. Based on these signals, the front controller then operates the wiper and determines its operation speed.

WIRING DIAGRAM

A01GX05E05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK WIPER


    1. Check the symptoms of the wiper. Check if the symptoms can be corrected with the information below.

      It is raining but wiper does not operate:
      Condition Note
      Windshield wiper switch in position other than AUTO Wiper only operates at AUTO setting
      Rain sensor temperature is -10°C (14°F) or less, or 70°C (158°F) or more

      • To prevent improper operation, wiper does not operate when rain sensor temperature is -10°C (14°F) or less

      • To prevent damage to rain sensor, it does not operate when outside temperature is 70°C (158°F) or more, or when sensor's interior temperature is 90°C (194°F) or more
      It is drizzling, or there is scattered rain If rain droplets do not contact rain sensor, or rain droplets are very small, they are not detected
      It is not raining but wiper operates:
      Condition Note
      Condensation on windshield Wiper may operate if condensation occurs in rain sensor detection area. If condensation recurs after rain sensor detection area is wiped, wiper operation may continue.
      Sun rays are strong If sudden changes in light intensity occur, wiper may operate
      Sudden temperature changes If sudden changes in temperature occur (A/C heater is used in winter, etc.), wiper may operate
      Object is contacting rain sensor If inner mirror contacts or strikes rain sensor, wiper may operate
      Windshield wiper switch OFF by AUTO Windshield wiper switch OFF by AUTO is wiper operates 1 time
      Wiper operation is irregular:
      Condition Note

      • Wiper blade is deteriorated

      • Windshield surface is oily

      		 Rain sensor detects rain amount when wipers are operating. When rain is not completely wiped off by wipers, decrease in ability to detect amount of rain occurs.

      • During scattered rain

      • Heavy rain with large droplets

      • During scattered rain or when rain droplets are large, rain droplets contact the sensor intermittently, causing wiper operation to be irregular

      • During heavy rain, it is difficult for sensor to learn "no rain" condition, causing wiper operation to be irregular
      Wiper volume is set to minimum Minimum wiper volume setting is designed to be non-sensitive (for users who prefer non-sensitive operation), resulting in irregular wiper operation
      Problem with wiper motor position signal When wiper motor position signal has chattering, wiper may operate excessively. During auto wiper operation inspection, if wiper operates several times, and furthermore replacement of rain sensor does not correct problem, wiper motor may be malfunctioning.

    NG

    CHECK WIPER OPERATION Click here

    OK

    END

  2. CHECK WIPER OPERATION


    1. Set the windshield wiper switch to the LO and HI setting, and check that the wipers operate normally.

      OK
      Wipers operate normally

    NG

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

  3. CHECK WINDSHIELD WIPER SWITCH


    1. Set the windshield wiper switch to AUTO, and check the problem symptom.

      Problem Symptom Proceed to
      It is raining but wiper does not operate A
      It is not raining but wiper operates B

    B

    CHECK RAIN SENSOR Click here

    A

  4. CHECK APPEARANCE


    1. Check the vehicle.

      Problem Symptom Proceed to
      Wiper operation does not operate normally A
      It is raining but wiper does not operate B

    B

    CHECK RAIN SENSOR Click here

    A

  5. CHECK WIPER RUBBER


    1. Activate the washer and check the wiper's ability to wipe.

      OK
      No residue after wipe

    NG

    REPLACE WIPER RUBBER Click here

    OK

  6. CHECK RAIN SENSOR


    1. Check that the rain sensor is installed properly.

      OK
      When viewed from outside vehicle, rain sensor's tape is not peeling, and has no air bubbles or dust or be stripped of bracket

    NG

    REPLACE RAIN SENSOR TAPE Click here

    OK

  7. READ VALUE USING INTELLIGENT TESTER (RAIN SENSOR)


    1. Check the Data List for proper functioning of the rain sensor.

      Rain Sensor:
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Rain Sensor Cold Rain sensor cold / COLD or OK

      COLD: Front wiper switch in AUTO position

      OK: Wiper switch not in AUTO position

      		 -
      Rain Sensor Hot Rain sensor cold / HOT or OK

      HOT: Front wiper switch in AUTO position

      OK: Wiper switch not in AUTO position

      		 -
      OK
      Rain sensor operates.

    NG

    REPLACE RAIN SENSOR Click here

    OK

  8. CHECK RAIN SENSOR


    1. Set the windshield wiper switch to AUTO. Wet a swab and squeeze the tip so that it is 4 to 6 mm 0. to mm wide. Touch the swab to the rain sensor detection area and check that the wiper LO operation occurs once.

      Malfunction Operation Proceed to
      Wiper operates 3 times or more A
      Any other operation B

    B

    REPLACE RAIN SENSOR Click here

    A

    REPLACE FRONT WIPER MOTOR Click here

  9. CHECK RAIN SENSOR


    1. Check that the rain sensor is installed properly.

      OK
      When viewed from outside vehicle, rain sensor's tape is not peeling, and has no air bubbles or dust or be stripped of bracket

    NG

    REPLACE RAIN SENSOR TAPE Click here

    OK

    REPLACE RAIN SENSOR Click here