WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER MOTOR ASSEMBLY

    B004UHKN06

    Tech Tips

    Since the windshield wiper motor assembly uses waterproof connectors, the voltage, resistance and waveform cannot be checked directly. The voltage, resistance and waveform are indicated for reference only.


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

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-1 (WSR+) - Body ground R - Body ground Washer motor operation signal Windshield washer motor and pump assembly not operating Below 1 V
      Windshield washer motor and pump assembly operating 11 to 14 V
      A43-2 (WSR-) - Body ground G - Body ground Washer motor operation signal Windshield washer motor and pump assembly not operating Below 1 V
      Windshield washer motor and pump assembly operating 11 to 14 V
      A43-3 (2S) - Body ground B - Body ground Wiper HI operation signal Windshield wiper motor assembly not operating 11 to 14 V
      Windshield wiper motor assembly HI operating Below 1 V
      A43-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A43-5 (FWAB) - Body ground B - Body ground Washer motor power supply Power switch off 11 to 14 V
      A43-6 (+B) - Body ground L - Body ground Wiper motor power supply Power switch on (IG) or within approximately 60 seconds of power switch being turned off 11 to 14 V
      Approximately 60 seconds have elapsed after power switch is turned off Below 1 V
      A43-7 (LIN) - Body ground B - Body ground LIN communication signal Power switch on (IG) Pulse generation
      Power switch off Below 1 V
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-4 (WSR+) - Body ground R - Body ground Washer motor operation signal Windshield washer motor and pump assembly not operating Below 1 V
      Windshield washer motor and pump assembly operating 11 to 14 V
      A43-3 (WSR-) - Body ground G - Body ground Washer motor operation signal Windshield washer motor and pump assembly not operating Below 1 V
      Windshield washer motor and pump assembly operating 11 to 14 V
      A43-2 (2S) - Body ground B - Body ground Wiper HI operation signal Windshield wiper motor assembly not operating 11 to 14 V
      Windshield wiper motor assembly HI operating Below 1 V
      A43-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A43-8 (FWAB) - Body ground B - Body ground Washer motor power supply Power switch off 11 to 14 V
      A43-7 (+B) - Body ground L - Body ground Wiper motor power supply Power switch on (IG) or within approximately 60 seconds of power switch being turned off 11 to 14 V
      Approximately 60 seconds have elapsed after power switch is turned off Below 1 V
      A43-6 (LIN) - Body ground B - Body ground LIN communication signal Power switch on (IG) Pulse generation
      Power switch off Below 1 V

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

    B004TKOC29
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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    2. Reconnect the instrument panel junction block assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω
      A-31 (BECU) - Body ground None - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      A-30 (ACC) - Body ground None - Body ground ACC power supply Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      A-32 (IG) - Body ground None - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V

    4. Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

      Click here

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G12-21 (WPS) - Body ground LG - Body ground Windshield wiper relay assembly (WIPER NO. 1) power supply Power switch on (IG) or within approximately 60 seconds of power switch being turned off 11 to 14 V
      Approximately 60 seconds have elapsed after power switch is turned off Below 1 V

  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

    B004R8BN41

    Tech Tips

    Since the headlight ECU sub-assembly uses waterproof connectors, the voltage, resistance and waveform cannot be checked directly. The voltage, resistance and waveform are indicated for reference only.


    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
      A32-4 (IG) - Body ground LA-R - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      A32-7 (HLC) - Body ground B - Body ground Headlight cleaner motor operation signal Power switch on (IG), light control switch head and headlight cleaner motor not operating 11 to 14 V
      Power switch on (IG), light control switch head and headlight cleaner operating Below 1 V
      A32-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A32-13 (ECUB) - Body ground R - Body ground Power supply Approximately 15 seconds elapsed after turning the power switch off Below 1 V
      Power switch on (IG) or within approximately 15 seconds of power switch being turned off 11 to 14 V

  4. CHECK COMBINATION METER ASSEMBLY


    1. Disconnect the G34 combination meter assembly connector.

      B004WZ2N05

    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
      G34-21 (IG+) - Body ground LA-G - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      G34-22 (B) - Body ground LA-B - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      G34-31 (ES) - Body ground LA - Body ground Body ground Always Below 1 Ω

    3. Reconnect the G34 combination meter 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
      G34-16 (WLVL) - Body ground V - Body ground Washer fluid level signal Power switch on (IG), washer fluid level not low 11 to 14 V
      Power switch on (IG), washer fluid level low Below 1 V