METER / GAUGE SYSTEM TERMINALS OF ECU


  1. COMBINATION METER ASSEMBLY

    A01CIY3E12

    1. Disconnect the C18 combination meter assembly connector.

    2. Measure the voltage and resistance of the wire harness side connector.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      C18-36 (SE) - Body ground BR - Body ground Ground Always Below 1 Ω
      C18-39 (IG+) - Body ground R - Body ground Ignition switch signal Ignition switch off → ON Below 2 V → 20 to 28 V
      C18-40 (B) - Body ground B - Body ground Battery Always 20 to 28 V

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

    3. Connect the C18 combination meter assembly connector.

    4. Measure the voltage and resistance of the wire harness side connector.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      C18-2 (ILL+) - Body ground G - Body ground Taillight signal Light control switch OFF → ON Below 2 V → 20 to 28 V
      C18-6 (B) - Body ground P - Body ground Turn signal RH signal

      Ignition switch ON

      Turn signal RH indicator light OFF → ON → OFF

      		 Below 2 V → 20 to 28 V → Below 2 V
      C18-8 (+) - Body ground Y - Body ground HEAD light signal Light control switch OFF → ON Below 2 V → 20 to 28 V
      C18-10 (+) - Body ground W - Body ground Rear fog light signal

      Light control switch ON

      Rear fog light switch OFF → ON

      		 Below 2 V → 20 to 28 V
      C18-11 (FOG) - Body ground BR - Body ground Front fog light signal

      Light control switch ON

      Front fog light switch OFF → ON

      		 Below 2 V → 20 to 28 V
      C18-12 (MSTI) - Body ground G - Body ground VCS ECU warning light signal VCS ECU warning light OFF → ON 20 to 28 V → Below 2 V
      C18-13 (PTO+)*1 - Body ground R - Body ground PTO indicator light signal PTO indicator light OFF → ON Below 2 V → 20 to 28 V
      C18-14 (PTOE)*1 - Body ground GR - Body ground PTO indicator light signal PTO indicator light OFF → ON Below 2 V → 20 to 28 V
      C18-16 (PTO-)*1 - Body ground W-B - Body ground PTO indicator light signal Always Below 2 V
      C18-18 (GLW-) - Body ground R - Body ground GLOW indicator light signal GLOW indicator light ON → OFF Below 2 V → 20 to 28 V
      C18-22 (S1)- Body ground B - Body ground Vehicle speed signal (Input) Driving at approximately 20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      C18-23 (SP03) - Body ground L - Body ground Vehicle speed signal (Output) Driving at approximately 20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      C18-25 (CHG-) - Body ground W - Body ground Charge warning light signal Ignition switch ON → off 20 to 28 V → Below 2 V
      C18-31 (ES) - Body ground R - Body ground ES start warning light signal ES start warning light ON → OFF Below 2 V → 20 to 28 V
      C18-34 (CHK) - Body ground GR - Body ground MIL signal MIL signal ON → OFF Below 2 V → 20 to 28 V
      C19-1 (L) - Body ground R - Body ground Fuel level signal Ignition switch ON 20 to 28 V
      C19-2 (DCTY) - Body ground P - Body ground Driver side door open Driver side door open → closed Below 2 V → 20 to 28 V
      C19-3 (E) - Body ground W - Body ground Fuel level signal Ignition switch ON 20 to 28 V
      C19-4 (DPNR) - Body ground V - Body ground DPF warning light signal DPF warning light ON → OFF Below 2 V → 20 to 28 V
      C19-6 (SW) - Body ground Y- Body ground SRS warning light signal SRS warning light ON → OFF Below 2 V → 20 to 28 V
      C19-10 (SW) - Body ground G - Body ground Brake fluid level warning light signal Brake fluid level warning light ON → OFF Below 2 V → 20 to 28 V
      C19-13 (CANL) - Body ground G - Body ground CAN communication signal Ignition switch off 200 Ω or higher
      C19-14 (CANH) - Body ground L - Body ground CAN communication signal Ignition switch off 200 Ω or higher
      C19-16 (TILT) - Body ground W - Body ground Cab tilt warning light signal Cab tilt warning light ON → OFF Below 2 V → 20 to 28 V
      C19-18 (PKB) - Body ground R - Body ground Brake warning light signal Brake warning light ON → OFF Below 2 V → 20 to 28 V
      C19-19 (B) - Body ground G - Body ground Driver side seat belt warning light signal Driver side seat belt warning light ON → OFF Below 2 V → 20 to 28 V
      C19-20 (VCM) - Body ground V - Body ground Vacuum switch signal Brake warning light ON → OFF Below 2 V → 20 to 28 V
      C19-21 (KSW) - Body ground SB - Body ground Key switch condition signal Key inserted → removed Below 2 V → 20 to 28 V
      C19-22 (B) - Body ground LG - Body ground Turn signal LH signal

      Ignition switch ON

      Turn signal LH indicator light OFF → ON → OFF

      		 Below 2 V → 20 to 28 V → Below 2 V
      C19-23 (BLP) - Body ground R - Body ground Reverse warning buzzer signal Reverse warning buzzer ON → OFF Below 2 V → 20 to 28 V

      • *1: for Power Take-off Electric Type


      1. A01CIA2E02

        Waveform 1: Using an oscilloscope

        Terminal Connections

        C18-22 (S1) - Body ground

        C18-23 (SP03) - Body ground
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Driving at approximately 20 km/h (12 mph)

        Tech Tips

        As the vehicle speed increases, the cycle of the signal waveform narrows.