WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER RELAY ASSEMBLY

    B000J38E16

    1. Disconnect the I72 windshield wiper relay assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I72-2 (IG) - Body ground L - Body ground Ignition switch ON signal (Power source circuit) Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      I72-8 (VR2) - I72-21 (VR1) B - W Adjusting volume circuit Windshield wiper switch adjusting ring* changed 0 to 220 Ω
      I72-12 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      I72-16 (WIG) - Body ground Y - Body ground Signal power source circuit Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      I72-25 (W) - Body ground GR - Body ground Front washer switch circuit Front washer switch on Below 1 Ω
      Front washer switch off 10 kΩ or higher

      Tech Tips

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

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the I72 windshield wiper relay assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I72-1 (+SM) - Body ground B - Body ground Front wiper motor position detection signal Front wiper motor in low or high operation Below 1 V ←→ 11 to 14 V
      Front wiper motor off Below 1 V
      I72-3 (C1) - I72-5 (CO) P - R Front wiper switch AUTO signal circuit Ignition switch ON, front wiper switch in AUTO Below 1 V
      Ignition switch ON, front wiper switch off 11 to 14 V
      I72-10 (+1) - Body ground B - Body ground Front wiper motor low speed signal circuit Front wiper motor in low operation 11 to 14 V
      Front wiper motor off Below 1 V
      I72-11 (+2) - Body ground V - Body ground Front wiper motor high speed signal circuit Front wiper motor in high operation 11 to 14 V
      Front wiper motor off Below 1 V
      I72-14 (MPX1) - Body ground G - Body ground Rain sensor signal Ignition switch ON Pulse generation
      I72-24 (SPD) - Body ground V - Body ground Speed signal Ignition switch ON, wheel being rotated

      Pulse generation

      (See Waveform 1)
      I72-25 (W) - Body ground GR - Body ground Front washer switch circuit Front washer switch on Below 1 V
      Front washer switch off 11 to 14 V

      If the result is not as specified, the windshield wiper relay assembly may have a malfunction.


      1. B000KIBE03

        Waveform 1 (Reference):

        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition 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.

  2. CHECK HEADLIGHT CLEANER CONTROL RELAY (w/ Headlight Cleaner System)

    B000IUDE11

    1. Disconnect the A52 headlight cleaner control relay connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A52-1 (HDLO) - A52-4 (E) GR - W-B Low beam headlight signal Light control switch in head position Below 1 V
      Light control switch off 11 to 14 V
      A52-2 (H) - A52-4 (E) SB - W-B Headlight cleaner switch operation signal Ignition switch ON, light control switch in off position and headlight cleaner switch off Below 1 V
      Ignition switch ON, light control switch in off position and headlight cleaner switch on 11 to 14 V
      A52-3 (IG) - A52-4 (E) R - W-B Ignition switch ON signal (Power source circuit) Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A52-4 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      A52-5 (FRWA) - A52-4 (E) G - W-B Front washer switch signal Ignition switch ON and front washer switch off 11 to 14 V
      Ignition switch ON and front washer switch on Below 1 V

      If the result is not as specified, there may be a malfunction in the wire harness.