WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER RELAY

    A01WUVWE03

    1. Disconnect the E139 windshield wiper relay connectors.

    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
      E139-2 (IG) - Body ground B - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      E139-8 (VR2) - E139-21 (VR1) W -R Adjust volume circit Windshield wiper switch adjusting ring changed 0 to 231 Ω
      E139-12 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      E139-16 (WIG) - Body ground B - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

    3. Reconnect the E139 windshield wiper relay connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E139-1 (+SM) - Body ground W - Body ground Front wiper motor operation signal Front wiper is operated 11 to 14 V
      Front wiper is stopped Below 1 V
      E139-3 (C1) - E139-5 (CO) L - R Windshield wiper assembly AUTO position signal Windshield wiper assembly in AUTO position Below 1 V
      Windshield wiper assembly in not AUTO position 11 to 14 V
      E139-10 (+1) - Body ground W - Body ground Front wiper motor low speed signal Front wiper motor in low operation 11 to 14 V
      Front wiper motor not operation 11 to 14 V
      E139-11 (+2) - Body ground R - Body ground Front wiper motor high speed signal Front wiper motor in high operation Below 1 V
      Front wiper motor not operation Below 1 V
      E139-14 (MPX1) - Body ground B - Body ground LIN communication signal Engine switch on (IG) Below 1 V
      E139-25 (W) - Body ground L - Body ground Front washer motor signal Front washer switch off 11 to 14 V
      Front washer switch on Below 1 V

  2. CHECK NO. 2 MAIN BODY ECU

    A01WPK1E03

    1. Disconnect the L33 ECU 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
      L33-14 (BECU) - L33-7 (GND) R - W-B Power source Always 11 to 14 V
      L33-13 (SIG) - L33-7 (GND) G - W-B Power source Engine switch on (IG) 11 to 14 V
      L33-7 (GND) - Body ground W-B - Body ground Power source Always Below 1 Ω

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

    3. Reconnect the L33 ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L33-1 (RWSM) - Body ground G - Body ground Rear wiper motor operation signal Rear wiper operated 11 to 14 V
      Rear wiper stopped Below 1 V
      L33-4 (WRLO) - Body ground G - Body ground Rear wiper motor power supply circuit Rear wiper switch off Below 1 V
      Rear wiper switch on 11 to 14 V
      L33-5 (WRSW) - Body ground B - Body ground Rear washer motor power source circuit Rear washer switch off Below 1 V
      Rear washer switch on 11 to 14 V

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

  3. CHECK RAIN SENSOR

    A01WUVSE07

    1. Disconnect the R11 rain sensor connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      R11-4 (SIG) - Body ground G - Body ground IG signal circuit (to IG relay) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      R11-1 (ES) - Body ground W - Body ground Ground circuit Always Below 1 V

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

  4. CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH (w/ Headlight Cleaner System)

    A01WTOLE03

    1. Disconnect the A65 headlight light control ECU sub-assembly RH connector.

    2. Measure the resistance and voltage 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
      A65-4 (IG) - Body ground G - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A65-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A65 headlight light control ECU sub-assembly RH connector.

      Tech Tips

      Since the headlight light control ECU sub-assembly RH uses a waterproof connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A65-7(HLC) - Body ground R - Body ground Headlight cleaner motor operation signal Engine switch on (IG), when low beam headlights turn on, Headlight cleaner motor not operating 11 to 14 V
      Engine switch on (IG), when low beam headlights turn on, Headlight cleaner motor operating Below 1 V
      A65-8 (SW2) - Body ground LG - Body ground Headlight cleaner switch signal Engine switch on (IG), Headlight cleaner switch off 11 to 14 V
      Engine switch on (IG), Headlight cleaner switch on Below 1 V