WIPER AND WASHER SYSTEM Rain Sensor Circuit

DESCRIPTION

The auto wiper system adjusts the wiper speed to the 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 windshield wiper ECU from the windshield wiper switch through the CAN line, and from the rains sensor through the LIN line. Based on these signals, the windshield wiper ECU operates the wiper and determines its operation speed.

WIRING DIAGRAM

A01EPRME02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK WIPER


    1. Check the symptoms of the wiper. Check if the causes of the symptoms are any of the following conditions shown in the charts.

      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 higher

      • 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, wiper does not operate when outside temperature is 70°C (158°F) or more, or when interior temperature of sensor 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 Wiper operates 1 time after windshield wiper switch is turned off by AUTO
      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 replacement of rain sensor does not correct problem, wiper motor may be malfunctioning.
      OK
      Causes of symptoms are one or more of above conditions

    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 SUSPECTED AREA 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.

      Result
      Result 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 OPERATION OF WIPER


    1. Check operation of the wipers.

      Result
      Result Proceed to
      Wiper 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 wiping ability of the wiper.

      OK
      No residue after wipe

    NG

    REPLACE WIPER RUBBER Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (COMBINATION SWITCH)


    1. Check the Data List for proper functioning of the combination switch.

      Body No. 5
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      F Wiper AUTO Switch Front wiper AUTO switch / ON or OFF

      ON: Front wiper switch in AUTO position

      OFF: Wiper switch not in AUTO position

      		 -
      OK
      Windshield wiper switch operates.

    NG

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    OK

  7. CHECK RAIN SENSOR


    1. Check that the rain sensor is installed properly.

      OK
      When viewed from outside of vehicle, rain sensor tape is not peeling and has no air bubbles or dust on it, and sensor has not come off bracket

    NG

    REPLACE RAIN SENSOR TAPE Click here

    OK

  8. 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

  9. CHECK RAIN SENSOR


    1. Set the windshield wiper switch to AUTO. Flatten the end of a cotton swab soaked with water so that it is 4 to 6 mm (0.157 to 0.236 in.) wide. Touch the swab to the rain sensor detection area and check that the wiper LO operation occurs once.

      Standard Measurement
      Area Specified Condition
      A 7 mm (0.276 in.)
      B 22 mm (0.866 in.)
      C 16.6 mm (0.654 in.)
      D 26.6 mm (1.05 in.)
      E 12 mm (0.472 in.)
      A01EOFFE01
      Result
      Result Proceed to
      Wiper does not operate A
      Wiper operates normally B
      Any other operation C

    B

    END

    C

    REPLACE WINDSHIELD WIPER ECU Click here

    A

    REPLACE RAIN SENSOR Click here

  10. CHECK RAIN SENSOR


    1. Check that the rain sensor is installed properly.

      OK
      When viewed from outside of vehicle, rain sensor tape is not peeling and has no air bubbles or dust on it, and sensor has not come off bracket

    NG

    REPLACE RAIN SENSOR TAPE Click here

    OK

    REPLACE RAIN SENSOR Click here