WIPER AND WASHER SYSTEM(w/ Rain Sensor) TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER RELAY ASSEMBLY

    A002QMLE02

    1. Disconnect the H56 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
      H56-25 (W) - Body ground W - Body ground Front washer switch signal Front washer switch on Below 1 Ω
      Front washer switch off 10 kΩ or higher
      H56-8 (VR2) - H56-21 (VR1) Y - G Adjusting ring signal Windshield wiper switch adjusting ring* changed from (+) side to (-) side Below 10 to 2700 Ω
      H56-2 (IG) - Body ground L - Body ground Power source Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      H56-12 (E) - Body ground BR - Body ground Ground Always Below 1 Ω

      Tech Tips

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


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

    3. Reconnect the H56 relay connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H56-10 (+1) - Body ground G - Body ground Front wiper motor LO speed signal Front wiper motor in LO operation 11 to 14 V
      Front wiper motor off Below 1 V
      H56-11 (+2) - Body ground GR - Body ground Front wiper motor HI speed signal Front wiper motor in HI operation 11 to 14 V
      Front wiper motor off Below 1 V
      H56-25 (W) - Body ground W - Body ground Front washer motor signal Front washer switch on Below 1 V
      Front washer switch off 11 to 14 V
      H56-1 (+SM) - Body ground G - Body ground Front wiper motor operation signal Front wiper motor in LO or HI operation 11 to 14 V
      Front wiper motor off Below 1 V
      H56-3 (C1) - H56-15 (CO) BE - L IG signal Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      H56-13 (SIG) - H56-7 (ES) P - LG Power source Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

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

  2. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    A002O2NE02
    A002P8FE02

    1. Disconnect the DB, DE, DF, DG and H80 ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      DB-30 (BECU) - Body ground W - Body ground ECU power supply (from battery) Always 11 to 14 V
      DG-1 (IG) - Body ground W - Body ground IG signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      DF-5 (ACC) - Body ground W - Body ground ACC signal Ignition switch off Below 1 V
      Ignition switch ACC 11 to 14 V
      DE-28 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H80-4 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the DB, DE, DF, DG and H80 ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H81-19 (HDLO) - Body ground*1, *2 G - Body ground Low beam headlight operation signal Low beam headlights not operating Below 1 V
      Low beam headlights operating 11 to 14 V
      H79-20 (HRLY) - Body ground*2 B - Body ground Headlight cleaner switch operation signal Headlight cleaner switch off 11 to 14 V
      Headlight cleaner switch on Below 1 V

      • *1: for HID Headlight

      • *2: w/ Headlight Cleaner System

      • If the result is not as specified, the ECU may have a malfunction.

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

    A002QL8E02

    1. Disconnect the A67 relay connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A67-3 (IG) - Body ground G - Body ground IG signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A67-4 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A67-1 (HDLO) - Body ground* SB - Body ground Low beam headlight operation signal Low beam headlights not operating Below 1 V
      Low beam headlights operating 11 to 14 V
      A67-2 (H) - Body ground R - Body ground Headlight cleaner switch operation signal Headlight cleaner switch on 11 to 14 V
      Headlight cleaner switch off Below 1 V
      A67-6 (PB) - Body ground B - Body ground Headlight cleaner motor signal Always 11 to 14 V
      A67-5 (FRWA) - Body ground* W - Body ground Front washer motor operation signal Front washer switch off 11 to 14 V
      Front washer switch on Below 1 V

      • *: for HID Headlight

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