WIPER AND WASHER SYSTEM Wiper and Washer Switch Circuit

DESCRIPTION

This circuit detects the state of the windshield wiper switch assembly (front wiper switch and front washer switch) and sends it to the windshield wiper relay assembly.

WIRING DIAGRAM


  1. for LHD:

    A004068E01

  2. for RHD:

    A004068E02

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY


    1. A004220E01
      Text in Illustration
      *1 Windshield Wiper Switch Assembly (Adjusting Ring Position)
      *a

      Component without harness connected

      (Windshield Wiper Switch Assembly)

      for LHD and RHD with Wiper Switch RH Side Type:


      1. Remove the windshield wiper switch assembly Click here.

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

        Standard Resistance
        Front Wiper Switch
        Tester Connection Switch Condition Specified Condition
        L38-3 (+1) - L38-1 (+S) OFF Below 1 Ω
        AUTO
        L38-3 (+1) - L38-2 (+B) MIST
        LO
        L38-2 (+B) - L38-4 (+2) HI
        L38-9 (AUTO) - L38-10 (E) AUTO
        Front Washer Switch
        Tester Connection Switch Condition Specified Condition
        L40-2 (EW) - L40-3 (WF) ON Below 1 Ω
        OFF 10 kΩ or higher
        Adjusting Ring*
        Tester Connection Switch Condition Specified Condition
        L38-7 (VR1) - L38-8 (VR2) P1 209 to 231 Ω
        P2 114 to 126 Ω
        P3 58.9 to 65.1 Ω
        P4 Below 1 Ω

        Tech Tips

        *: The rain sensor sensitivity can be adjusted by the windshield wiper switch adjusting ring.

    2. A0042M4E01
      Text in Illustration
      *1 Windshield Wiper Switch Assembly (Adjusting Ring Position)
      *a

      Component without harness connected

      (Windshield Wiper Switch Assembly)

      for Wiper Switch LH Side Type:


      1. Remove the windshield wiper switch assembly Click here.

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

        Standard Resistance
        Front Wiper Switch
        Tester Connection Switch Condition Specified Condition
        L38-2 (+1) - L38-4 (+S) OFF Below 1 Ω
        AUTO
        L38-2 (+1) - L38-3 (+B) MIST
        LO
        L38-3 (+B) - L38-1 (+2) HI
        L38-6 (AUTO) - L38-5 (E) AUTO
        Front Washer Switch
        Tester Connection Switch Condition Specified Condition
        L40-2 (EW) - L40-1 (WF) ON Below 1 Ω
        OFF 10 kΩ or higher
        Adjusting Ring*
        Tester Connection Switch Condition Specified Condition
        L38-8 (VR1) - L38-7 (VR2) P1 209 to 231 Ω
        P2 114 to 126 Ω
        P3 58.9 to 65.1 Ω
        P4 Below 1 Ω

        Tech Tips

        *: The rain sensor sensitivity can be adjusted by the windshield wiper switch adjusting ring.


    NG

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - WINDSHIELD WIPER RELAY ASSEMBLY AND BODY GROUND)


    1. for LHD and RHD with Wiper Switch RH Side Type:


      1. Disconnect the L63 windshield wiper relay assembly connector and A33 windshield wiper motor assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L38-1 (+S) - L63-11 (+SSW) Always Below 1 Ω
        L38-1 (+S) - Body ground Always 10 kΩ or higher
        L38-2 (+B) - L63-12 (IG) Always Below 1 Ω
        L38-2 (+B) - Body ground Always 10 kΩ or higher
        L38-3 (+1) - L63-1 (+2S) Always Below 1 Ω
        L38-3 (+1) - Body ground Always 10 kΩ or higher
        L38-4 (+2) - L63-3 (+2) Always Below 1 Ω
        L38-4 (+2) - A33-3 (+2) Always Below 1 Ω
        L38-4 (+2) - Body ground Always 10 kΩ or higher
        L38-7 (VR1) - L63-7 (VR1) Always Below 1 Ω
        L38-7 (VR1) - Body ground Always 10 kΩ or higher
        L38-8 (VR2) - L63-6 (VR2) Always Below 1 Ω
        L38-8 (VR2) - Body ground Always 10 kΩ or higher
        L38-9 (AUTO) - L63-17 (C1) Always Below 1 Ω
        L38-9 (AUTO) - Body ground Always 10 kΩ or higher
        L38-10 (E) - L63-16 (CO) Always Below 1 Ω
        L38-10 (E) - Body ground Always 10 kΩ or higher
        L40-2 (EW) - Body ground Always Below 1 Ω
        L40-3 (WF) - L63-4 (W) Always Below 1 Ω
        L40-3 (WF) - Body ground Always 10 kΩ or higher

    2. Wiper Switch LH Side Type:


      1. Disconnect the L63 windshield wiper relay assembly connector and A33 windshield wiper motor assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L38-1 (+2) - L63-3 (+2) Always Below 1 Ω
        L38-1 (+2) - A33-3 (+2) Always Below 1 Ω
        L38-1 (+2) - Body ground Always 10 kΩ or higher
        L38-2 (+1) - L63-1 (+2S) Always Below 1 Ω
        L38-2 (+1) - Body ground Always 10 kΩ or higher
        L38-3 (+B) - L63-12 (IG) Always Below 1 Ω
        L38-3 (+B) - Body ground Always 10 kΩ or higher
        L38-4 (+S) - L63-11 (+SSW) Always Below 1 Ω
        L38-4 (+S) - Body ground Always 10 kΩ or higher
        L38-5 (E) - L63-16 (CO) Always Below 1 Ω
        L38-5 (E) - Body ground Always 10 kΩ or higher
        L38-6 (AUTO) - L63-17 (C1) Always Below 1 Ω
        L38-6 (AUTO) - Body ground Always 10 kΩ or higher
        L38-7 (VR2) - L63-6 (VR2) Always Below 1 Ω
        L38-7 (VR2) - Body ground Always 10 kΩ or higher
        L38-8 (VR1) - L63-7 (VR1) Always Below 1 Ω
        L38-8 (VR1) - Body ground Always 10 kΩ or higher
        L40-1 (WF) - L63-4 (W) Always Below 1 Ω
        L40-1 (WF) - Body ground Always 10 kΩ or higher
        L40-2 (EW) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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