WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER RELAY ASSEMBLY (w/ Auto Wiper System)

    A0027KPN03

    1. Disconnect the F79 windshield wiper relay assembly connector.


      1. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

        Terminal No.

        (Symbol)

        		 Wiring Color Terminal Description Condition Specified Condition
        F79-2 (IG) - Body ground W - Body ground Ignition switch ON signal (Power source circuit) Ignition switch ON 11 to 14 V
        Ignition switch off Below 1 V
        F79-25 (W) - Body ground B - Body ground Front washer switch signal Front washer switch on Below 1 Ω
        Front washer switch off 10 kΩ or higher
        F79-8 (VR2) - F79-21 (VR1) L - P Adjusting volume signal Windshield wiper switch adjusting ring* changed 0 to 231 Ω
        F79-12 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω
        F79-16 (WIG) - Body ground V - Body ground Power source signal Ignition switch ON 11 to 14 V
        Ignition switch off Below 1 V

        Tech Tips

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

    2. Connect the F79 windshield wiper relay assembly connector.


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

        Terminal No.

        (Symbol)

        		 Wiring Color Terminal Description Condition Specified Condition
        F79-10 (+1) - Body ground LA-G - Body ground Front wiper motor low speed signal Front wiper motor off Below 1 Ω

      2. Measure the voltage and check for pulses according to the value(s) in the table below.

        Terminal No.

        (Symbol)

        		 Wiring Color Terminal Description Condition Specified Condition
        F79-1 (+SM) - Body ground LA-G - Body ground Front wiper motor position detection signal Front wiper motor in low or high operation Below 1 V ←→ 11 to 14V
        Front wiper motor off Below 1 V
        F79-3 (C1) - F79-5 (CO) V - B Front wiper switch AUTO signal Ignition switch ON, front wiper switch in AUTO Below 1 V
        Ignition switch ON, front wiper switch off 11 to 14 V
        F79-25 (W) - Body ground B - Body ground Front washer switch signal Ignition switch ON, front washer switch on Below 1 V
        Ignition switch ON, front washer switch off 11 to 14 V
        F79-10 (+1) - Body ground LA-G - Body ground Front wiper motor low speed signal Front wiper motor in low operation 11 to 14 V
        F79-11 (+2) - Body ground R - Body ground Front wiper motor high speed signal Front wiper motor in high operation 11 to 14 V
        Front wiper motor off Below 1 V
        F79-14 (MPX1) - Body ground GR - Body ground Rain sensor signal Ignition switch ON Pulse generation
        F79-24 (SPD) - Body ground BE - Body ground Speed signal Ignition switch ON, wheel being rotated

        Pulse generation

        (See waveform 1)
      3. A0028FGN03

        Waveform 1 (Reference):

        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Ignition switch ON, wheel being rotated

        Tech Tips

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.