WIPER AND WASHER SYSTEM TERMINALS OF ECU


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

    A005CHSE02

    1. Disconnect the L146 windshield wiper relay assembly connector.

    2. 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
      L146-2 (IG) - Body ground B - Body ground Power switch on (IG) signal (Power source circuit) Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      L146-8 (VR2) - L146-21 (VR1) W - L Adjusting volume circuit Windshield wiper switch adjusting ring* changed 0 to 231 Ω
      L146-12 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      L146-16 (WIG) - Body ground BE - Body ground Signal power source circuit Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      L146-25 (W) - Body ground B - 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 L146 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
      L146-1 (+SM) - Body ground G - 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
      L146-3 (C1) - L146-5 (C0) V - Y Front wiper switch AUTO signal circuit Power switch on (IG), front wiper switch in AUTO Below 1 V
      Power switch on (IG), front wiper switch off 11 to 14 V
      L146-10 (+1) - Body ground G - 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
      L146-11 (+2) - Body ground L - 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
      L146-14 (MPX1) - Body ground Y - Body ground Rain sensor signal Power switch on (IG) Pulse generation
      L146-24 (SPD) - Body ground W - Body ground Speed signal Power switch on (IG), wheel being rotated

      Pulse generation

      (See Waveform 1)
      L146-25 (W) - Body ground B - Body ground Front washer switch circuit Power switch on (IG), front washer switch on Below 1 V
      Power switch on (IG), 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. A005CMME01

        Waveform 1 (Reference):

        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Power switch on (IG), 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.