WIPER AND WASHER SYSTEM Wiper Switch (HI Speed) Circuit

DESCRIPTION

The front light ECU receives the HI position signal of the wiper switch to operate the wiper motor at HI speed. Even if the ECU malfunctions, its circuit structure enables it to operate the wiper in HI operation mode.

WIRING DIAGRAM

A001DM4E28

PROCEDURE


  1. CHECK FRONT LIGHT ECU (2S SIGNAL)


    1. A001F3IE02
      *1 Front view of wire harness connector: (to Front Light ECU)

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A51-14 (2S) - Body ground Wiper switch not in HI position 11 to 14 V
      A51-14 (2S) - Body ground Wiper switch in HI position Below 1 V

    OK

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

    NG

  2. INSPECT WINDSHIELD WIPER SWITCH (COMBINATION SWITCH ECU)


    1. A001ARAE05
      *1 Component with harness connected: (Windshield Wiper Switch)

      Disconnect or remove switch Click here

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      3 (2S) - 8 (E) Wiper switch in HI position Below 1 Ω
      3 (2S) - 8 (E) Wiper switch not in HI position 10 kΩ or higher

    NG

    REPLACE WINDSHIELD WIPER SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (WIPER SWITCH - LIGHT ECU AND BODY GROUND)


    1. Disconnect the L25 switch connector.

      A001EMPE01
      *1 Front view of wire harness connector: (to Wiper Switch)
      *2 Front view of wire harness connector: (to Front Light ECU)

    2. Disconnect the A51 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L25-3 (2S) - A51-14 (2S) Always Below 1 Ω
      L25-8 (E) - Body ground Always Below 1 Ω
      A51-14 (2S) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR