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

B001LQ8E14

PROCEDURE


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


    1. Disconnect the H75 windshield wiper relay assembly connector.

    2. Disconnect the T7 rain sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H75-8 (SIG) - T7-4 (SIG) Always Below 1 Ω
      T7-4 (SIG) - Body ground Always 10 kΩ or higher
      H75-14 (PA1) - T7-3 (AUTO) Always Below 1 Ω
      T7-3 (AUTO) - Body ground Always 10 kΩ or higher
      H75-25 (E) - T7-1 (ES) Always Below 1 Ω
      T7-1 (ES) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT WINDSHIELD WIPER RELAY ASSEMBLY


    1. B001KFTE01
      Text in Illustration
      *a

      Component with harness connected

      (Windshield Wiper Relay Assembly)

      Reconnect the H75 windshield wiper relay assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H75-8 (SIG) - H75-25 (E) Power switch on (IG) 7.5 to 8.5 V

    NG

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY Click here

    OK

  3. INSPECT RAIN SENSOR


    1. B001L8NE02
      Text in Illustration
      *a

      Component with harness connected

      (Rain Sensor)

      Reconnect the T7 rain sensor connector.

    2. Connect an oscilloscope to the rain sensor connector.

    3. Check for pulses.

      OK
      Tester Connection Condition Specified Condition
      T7-3 (AUTO) - T7-1 (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