METER / GAUGE SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER

    A0119T8E03

    1. Disconnect the D1 combination meter assembly connector.

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

      Terminals No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D1-1 (IG+) - Body ground SB - Body ground Ignition switch signal Ignition switch off → ON Below 1 V → 11 to 14 V
      D1-2 (B) - Body ground P - Body ground Battery Always 11 to 14 V
      D1-24 (ET) - Body ground BR - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the D1 combination meter assembly connector.

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

      Terminals No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D1-3 (L) - Body ground GR - Body ground Fuel level signal

      Ignition switch ON

      Fuel level is FULL → EMPTY

      		 Below 1 V → 4.5 to 9.0 V
      D1-4 (TX1-) - Body ground V- Body ground Ambient temperature sensor (thermistor assembly) signal Ignition switch ON 4.5 to 5.5 V
      D1-5 (RRSB)*1 - Body ground LG - Body ground Rear seat inner belt assembly signal (RH side) Rear RH seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      D1-6 (RLSB)*1 - Body ground R - Body ground Rear seat inner belt assembly signal (LH side) Rear LH seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      D1-7 (RRBT)*1 - Body ground B - Body ground Rear RH seat belt warning light signal Rear RH seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      D1-8 (FUS-) - Body ground BR - Body ground Fuel sender gauge assembly ground Always Below 1 Ω
      D1-9 (RLBT)*1 - Body ground SB - Body ground Rear LH seat belt warning light signal Rear LH seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      D1-10 (P/SB) - Body ground V - Body ground Front seat inner belt assembly signal (passenger side) Front passenger seat is occupied and its seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      D1-12 (R)*2 - Body ground GR - Body ground M/T shift position signal (R) M/T shift warning buzzer OFF → ON Below 1 V → 11 to 14 V
      D1-14 (ILL+) - Body ground G - Body ground Taillight signal Headlight dimmer switch assembly OFF → ON Below 1 V → 11 to 14 V
      D1-15 (LP)*3 - Body ground SB - Body ground Security indicator light signal Security indicator light OFF → ON Below 1 V → 11 to 14 V
      D1-16 (+S) - Body ground BR - Body ground Speed signal (Output)

      Driving at approximately

      20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      D1-17 (SI) - Body ground G - Body ground Speed signal (Input)

      Driving at approximately

      20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      D1-20 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      D1-21 (CANH) - Body ground G - Body ground CAN communication line Ignition switch ON Pulse generation
      D1-23 (TX1+) - Body ground L - Body ground Ambient temperature sensor (thermistor assembly) ground Always Below 1 Ω
      D2-1 (B) - Body ground P - Body ground Left turn signal

      Ignition switch ON

      Left turn indicator light OFF → ON

      		 Below 1 V → 11 to 14 V
      D2-2 (FOG)*4 - Body ground GR - Body ground Front fog signal

      Ignition switch ON

      Front fog switch OFF → ON

      		 Below 1 V → 11 to 14 V
      D2-3 (S) - Body ground W - Body ground Rear fog signal

      Ignition switch ON

      Rear fog switch OFF → ON

      		 Below 1 V → 11 to 14 V
      D2-5 (EFI) - Body ground BR - Body ground Check engine warning light signal Check engine warning light ON → OFF Below 1 V → 11 to 14 V
      D2-7 (SW) - Body ground W - Body ground Brake fluid level warning light signal

      Ignition switch ON

      Brake fluid level warning light ON → OFF

      		 Below 1 V → 11 to 14 V
      D2-8 (CHG-) - Body ground R - Body ground Charge warning light signal

      Engine start

      Charge warning light ON → OFF

      		 Below 1 V → 11 to 14 V
      D2-9 (IND) - Body ground SB - Body ground Tail light indicator signal Headlight dimmer switch assembly ON → OFF Below 1 V → 11 to 14 V
      D2-10 (B) - Body ground L - Body ground Right turn signal

      Ignition switch ON

      Right turn indicator light OFF → ON

      		 Below 1 V → 11 to 14 V
      D2-11 (+) - Body ground B - Body ground High beam indicator signal (+) Always 11 to 14 V
      D2-13 (S) - Body ground LG - Body ground Engine oil pressure signal Engine oil pressure warning light ON → OFF Below 1 V → 11 to 14 V
      D2-14 (-) - Body ground W-B - Body ground High beam indicator signal (-) High beam indicator light ON → OFF Below 1 V → 11 to 14 V
      D2-16 (PBLT) - Body ground Y - Body ground Passenger seat belt warning light signal

      Ignition switch ON

      Passenger seat belt warning light OFF → ON → OFF

      		 Below 1 V → 11 to 14 V → Below 1 V

      • *1: w/ Rear Seat Belt Warning System

      • *2: for Manual Transaxle

      • *3: w/ Theft Deterrent System

      • *4: w/ Fog Light

      If the result is not as specified, the combination meter assembly may have a malfunction.


      1. A0118HOE01

        Waveform 1: Using an oscilloscope

        Terminal Connections

        D1-16 (+S) and Body ground

        D1-17 (SI) and 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.

  2. CHECK MAIN BODY ECU AND INSTRUMENT PANEL JUNCTION BLOCK

    A01179UE01
    Text in Illustration
    *1 Instrument Panel Junction Block - -
    A011B53E01
    Text in Illustration
    *1 Main Body ECU (w/ Theft Deterrent System) - -
    A0119MJE02
    Text in Illustration
    *1 Main Body ECU (w/o Theft Deterrent System) - -

    1. Remove the main body ECU.

    2. Disconnect the main body ECU connector.

    3. Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3F-11 (GND1) - Body ground - Ground Always Below 1 Ω
      3F-29 (ACC)*1 - Body ground - Ignition power supply (ACC signal) Ignition switch ACC → off 11 to 14 V → Below 1 V
      3F-30 (BECU) - Body ground - +B (power system signal system) power supply Always 11 to 14 V
      3F-31 (ALTB) - Body ground - +B (power system alternator system) power supply Always 11 to 14 V
      3F-32 (IG)*1 - Body ground - Ignition power supply (IG signal) Ignition switch ON → off 11 to 14 V → Below 1 V
      D42-19 (BCTY) - Body ground V - Body ground Back door courtesy switch input Back door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω

      • *1: w/o Entry and Start System

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

    4. Reconnect the main body ECU connector.

    5. Reinstall the main body ECU.

    6. Measure the voltage between each terminal of the wire harness side connectors and body ground.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3C-33 (PKB) - Body ground R - Body ground Parking brake signal Parking brake warning light ON → OFF Below 1 V → 11 to 14 V
      3E-20 (DBKL) - Body ground SB - Body ground Front seat inner belt assembly signal (driver side) Driver seat belt warning light OFF → ON Below 1 V → 11 to 14 V
      D42-13 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      D42-14 (CANH) - Body ground R - Body ground CAN communication line Ignition switch ON Pulse generation

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