WIPER AND WASHER SYSTEM Rain Sensor Circuit

DESCRIPTION

The windshield wiper relay assembly receives a signal from the rain sensor to control the auto wiper system.

WIRING DIAGRAM

A005CR2E13

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - RAIN SENSOR)


    1. Disconnect the L146 windshield wiper relay assembly connector.

    2. Disconnect the U12 rain sensor connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L146-14 (MPX1) - U12-1 (MPX) Always Below 1 Ω
      U12-1 (MPX) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT HARNESS AND CONNECTOR (RAIN SENSOR - AUXILIARY BATTERY AND BODY GROUND)


    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      U12-4 (SIG) - U12-2 (ES) Power switch on (IG) 11 to 14 V

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      U12-2 (ES) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT RAIN SENSOR


    1. A005AHHE01
      Text in Illustration
      *a

      Component with harness connected

      (Rain Sensor)

      Reconnect the U12 rain sensor connector.

    2. Connect an oscilloscope to the rain sensor connector.

    3. Check for pulses.

      OK
      Tester Connection Condition Specified Condition
      U12-1 (MPX) - U12-2 (ES) Power switch on (IG) Pulse generation

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE RAIN SENSOR Click here