WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY (for Windshield Wiper Switch LH Side Type)

    B001FZVE02

    1. Disconnect the G120 windshield wiper switch 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
      G120-11 (+B) - Body ground G - Body ground Ignition switch power supply Ignition switch ON 11 to 14 V
      G120-11 (+B) - Body ground G - Body ground Ignition switch power supply Ignition switch off Below 1 V
      G120-7 (WIG) - Body ground G - Body ground Ignition switch power supply Ignition switch ON 11 to 14 V
      G120-7 (WIG) - Body ground G - Body ground Ignition switch power supply Ignition switch off Below 1 V
      G120-9 (EW) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the G120 windshield wiper switch 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
      G120-8 (WF) - Body ground B - Body ground Front washer motor output Front washer switch on Below 1 V
      G120-8 (WF) - Body ground B - Body ground Front washer motor output Front washer switch off 11 to 14 V
      G120-4 (SPD) - Body ground R - Body ground Speed signal Driving at approx. 20 km/h (12 mph) Pulse generation (See waveform 1)
      G120-3 (TAIL) - Body ground V - Body ground Light control switch tail position signal input Light control switch in tail position 11 to 14 V
      G120-3 (TAIL) - Body ground V - Body ground Light control switch tail position signal input Light control switch off Below 1 V
      G120-2 (+1) - Body ground B - Body ground Front wiper motor LO speed signal circuit Front wiper motor in LO operation 11 to 14 V
      G120-2 (+1) - Body ground B - Body ground Front wiper motor LO speed signal circuit Front wiper motor off Below 1 V
      G120-1 (+2) - Body ground R - Body ground Front wiper motor HI speed signal circuit Front wiper motor in HI operation 11 to 14 V
      G120-1 (+2) - Body ground R - Body ground Front wiper motor HI speed signal circuit Front wiper motor off Below 1 V
      G120-10 (+S) - Body ground W - Body ground Front wiper motor operation signal Front wiper motor operates 11 to 14 V
      G120-10 (+S) - Body ground W - Body ground Front wiper motor operation signal Front wiper motor off Below 1 V
      G120-16 (C1R) - Body ground B - Body ground Rear wiper motor LO speed signal circuit Ignition switch ON, rear wiper switch LO Below 1 V
      G120-16 (C1R) - Body ground B - Body ground Rear wiper motor LO speed signal circuit Ignition switch ON, rear wiper switch off 11 to 14 V
      G120-18 (+1R) - Body ground R - Body ground Rear wiper motor HI speed signal circuit Ignition switch ON, rear wiper switch HI Below 1 V
      G120-18 (+1R) - Body ground R - Body ground Rear wiper motor HI speed signal circuit Ignition switch ON, rear wiper switch off 11 to 14 V
      G120-17 (WR) - Body ground V - Body ground Rear washer motor output Rear washer switch on Below 1 V
      G120-17 (WR) - Body ground V - Body ground Rear washer motor output Rear washer switch off 11 to 14 V
    5. B001HIRE01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) G120-4 (SPD) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Driving at approx. 20 km/h (12 mph)

  2. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY (for Windshield Wiper Switch RH Side Type)

    B001FZVE02

    1. Disconnect the G120 windshield wiper switch 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
      G120-17 (+B) - Body ground G - Body ground Ignition switch power supply Ignition switch ON 11 to 14 V
      G120-17 (+B) - Body ground G - Body ground Ignition switch power supply Ignition switch off Below 1 V
      G120-3 (WIG) - Body ground G - Body ground Ignition switch power supply Ignition switch ON 11 to 14 V
      G120-3 (WIG) - Body ground G - Body ground Ignition switch power supply Ignition switch off Below 1 V
      G120-1 (EW) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the G120 windshield wiper switch 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
      G120-2 (WF) - Body ground B - Body ground Front washer motor output Front washer switch on Below 1 V
      G120-2 (WF) - Body ground B - Body ground Front washer motor output Front washer switch off 11 to 14 V
      G120-6 (SPD) - Body ground R - Body ground Speed signal Driving at approx. 20 km/h (12 mph) Pulse generation (See waveform 1)
      G120-7 (TAIL) - Body ground V - Body ground Light control switch tail position signal input Light control switch in tail position 11 to 14 V
      G120-7 (TAIL) - Body ground V - Body ground Light control switch tail position signal input Light control switch off Below 1 V
      G120-8 (+1) - Body ground B - Body ground Front wiper motor LO speed signal circuit Front wiper motor in LO operation 11 to 14 V
      G120-8 (+1) - Body ground B - Body ground Front wiper motor LO speed signal circuit Front wiper motor off Below 1 V
      G120-9 (+2) - Body ground R - Body ground Front wiper motor HI speed signal circuit Front wiper motor in HI operation 11 to 14 V
      G120-9 (+2) - Body ground R - Body ground Front wiper motor HI speed signal circuit Front wiper motor off Below 1 V
      G120-18 (+S) - Body ground W - Body ground Front wiper motor operation signal Front wiper motor operates 11 to 14 V
      G120-18 (+S) - Body ground W - Body ground Front wiper motor operation signal Front wiper motor off Below 1 V
      G120-12 (C1R) - Body ground B - Body ground Rear wiper motor LO speed signal circuit Ignition switch ON, rear wiper switch LO Below 1 V
      G120-12 (C1R) - Body ground B - Body ground Rear wiper motor LO speed signal circuit Ignition switch ON, rear wiper switch off 11 to 14 V
      G120-10 (+1R) - Body ground R - Body ground Rear wiper motor HI speed signal circuit Ignition switch ON, rear wiper switch HI Below 1 V
      G120-10 (+1R) - Body ground R - Body ground Rear wiper motor HI speed signal circuit Ignition switch ON, rear wiper switch off 11 to 14 V
      G120-11 (WR) - Body ground V - Body ground Rear washer motor output Rear washer switch on Below 1 V
      G120-11 (WR) - Body ground V - Body ground Rear washer motor output Rear washer switch off 11 to 14 V
    5. B001HIRE01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) G120-6 (SPD) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Driving at approx. 20 km/h (12 mph)

  3. CHECK HEADLIGHT CLEANER CONTROL RELAY

    B001IBCE02

    1. Disconnect the A38 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
      A38-1 (HDLO) - A38-4 (E) V - W-B Low beam headlight signal Headlight dimmer switch in head 11 to 14 V
      A38-1 (HDLO) - A38-4 (E) V - W-B Low beam headlight signal Headlight dimmer switch not in head Below 1 V
      A38-3 (IG) - A38-4 (E) L - W-B Ignition switch power supply Ignition switch ON 11 to 14 V
      A38-3 (IG) - A38-4 (E) L - W-B Ignition switch power supply Ignition switch off Below 1 V
      A38-4 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      A38-5 (FRWA) - A38-4 (E) B - W-B Front washer switch operation signal Front washer motor switch on Below 1 V
      A38-5 (FRWA) - A38-4 (E) B - W-B Front washer switch operation signal Front washer motor switch off 11 to 14 V

  4. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B001F4ZE01
    Text in Illustration
    *A for LHD *B for RHD

    1. Remove the main body ECU (multiplex network body ECU) Click here.

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

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      A-31 (ALTB) - Body ground - Battery power supply Always 11 to 14 V
      A-32 (IG) - Body ground - Ignition switch power supply Ignition switch ON 11 to 14 V
      A-32 (IG) - Body ground - Ignition switch power supply Ignition switch off Below 1 V
      A-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      A-29 (ACC) - Body ground - ACC power supply Ignition switch off Below 1 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω
      G63-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Install the main body ECU (multiplex network body ECU) Click here.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G63-16 (HDLO) - G63-3 (GND2) V - W-B Low beam headlight signal Headlight dimmer switch in head 11 to 14 V
      G63-16 (HDLO) - G63-3 (GND2) V - W-B Low beam headlight signal Headlight dimmer switch not in head Below 1 V
      G64-19 (BCTY) - G63-3 (GND2) G - W-B Back door courtesy light switch input Back door open Below 1 V
      G64-19 (BCTY) - G63-3 (GND2) G - W-B Back door courtesy light switch input Back door closed Pulse generation (See waveform 1 or 2)
      G64-1 (GCTY) - G63-3 (GND2) V - W-B Glass hatch courtesy switch input Glass hatch open Below 1 V
      G64-1 (GCTY) - G63-3 (GND2) V - W-B Glass hatch courtesy switch input Ignition switch off, all doors closed and glass hatch closed Pulse generation (See waveform 3 or 4)
      G63-20 (RWMR) - G63-3 (GND2) B - W-B Rear wiper power supply input Ignition switch ON, glass hatch open Below 1 V
      G63-20 (RWMR) - G63-3 (GND2) B - W-B Rear wiper power supply input Ignition switch ON, glass hatch closed 11 to 14 V
    5. B001DE0E01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) G64-19 (BCTY) - G63-3 (GND2)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Back door closed
    6. B001H4LE01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) G64-19 (BCTY) - G63-3 (GND2)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Back door closed
    7. B001DE0E01

      Using an oscilloscope, check waveform 3.

      Waveform 3 (Reference)
      Item Content
      Terminal No. (Symbol) G64-1 (GCTY) - G63-3 (GND2)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and glass hatch closed
    8. B001H4LE01

      Using an oscilloscope, check waveform 4.

      Waveform 4 (Reference)
      Item Content
      Terminal No. (Symbol) G64-1 (GCTY) - G63-3 (GND2)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and glass hatch closed