METER / GAUGE SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY

    A01UYO7E02

    1. Disconnect the F1 and F2 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
      F1-21 (ET) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F1-39 (IG+) - Body ground P - Body ground Ignition switch signal Ignition switch off → ON (IG) Below 1 V → 11 to 14 V
      F1-40 (B) - Body ground L - Body ground Battery Always 11 to 14 V
      F2-1 (B) - Body ground R - Body ground Battery Always 11 to 14 V

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

    3. Reconnect the F1 and F2 combination meter assembly connector.

    4. Measure the voltage, resistance and check for pulses of the wire harness side connector.

      Terminals No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F1-1 (RLMT) - Body ground GR - Body ground Rear LH seat belt warning light signal Rear LH seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      F1-2 (RCMT) - Body ground G - Body ground Rear CENTER seat belt warning light signal Rear CENTER seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      F1-3 (RRMT) - 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
      F1-5 (SI) - Body ground L - Body ground Speed signal (Input)

      Driving at approximately

      20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      F1-6 (+S) - Body ground SB - Body ground Speed signal (Output)

      Driving at approximately

      20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      F1-7 (P/SB) - Body ground P - 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
      F1-9 (S) - Body ground Y - Body ground Engine oil pressure signal Engine oil pressure warning light ON → OFF Below 1 V → 11 to 14 V
      F1-11 (CHK) - Body ground LG - Body ground Check engine warning light signal Check engine warning light ON → OFF Below 1 V → 11 to 14 V
      F1-14 (-) - Body ground W-B - Body ground High beam indicator signal (-) Always Below 1 V
      F1-16 (L) - Body ground G - Body ground Fuel level signal

      Ignition switch ON (IG)

      Fuel level is FULL → EMPTY

      		 Below 1 V → 4.5 to 9.0 V
      F1-19 (+) - Body ground GR - Body ground High beam indicator signal (+) High beam indicator ON → OFF 11 to 14 V → Below 1 V
      F1-20 (ILL+) - Body ground R - Body ground Taillight signal Light control switch off → on Below 1 V → 11 to 14 V
      F1-24 (RLSB) - Body ground V - Body ground Rear seat inner belt assembly signal (LH side) Rear LH seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-25 (RCSB) - Body ground R - Body ground Rear seat inner belt assembly signal (Center side) Rear CENTER seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-26 (RRSB) - Body ground BE - Body ground Rear seat inner belt assembly signal (RH side) Rear RH seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-31 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON (IG) Pulse generation
      F1-32 (CANH) - Body ground G - Body ground CAN communication line Ignition switch ON (IG) Pulse generation
      F2-3 (HAZ) - Body ground L - Body ground Hazard warning signal switch signal Hazard warning signal switch off 11 to 14 V
      Hazard warning signal switch on Below 1 Ω
      F2-6 (TAIL) - Body ground LG - Body ground Taillight signal Light control switch off → on Below 1 V → 11 to 14 V
      F2-7 (LR) - Body ground V - Body ground Right turn signal

      Ignition switch ON (IG)

      Right turn indicator light OFF → ON

      		 Below 1 V → 11 to 14 V
      F2-9 (ER) - Body ground B - Body ground Turn signal switch RH signal Turn signal switch RH on Below 1 V
      Turn signal switch RH off 11 to 14 V
      F2-10 (EL) - Body ground Y - Body ground Turn signal switch LH signal Turn signal switch LH on Below 1 V
      Turn signal switch LH off 11 to 14 V
      F2-11 (S) - Body ground SB - Body ground Rear fog signal

      Ignition switch ON (IG)

      Rear fog switch off → on

      		 Below 1 V → 11 to 14 V
      F2-12 (FOG)*1 - Body ground BE - Body ground Front fog signal

      Ignition switch ON (IG)

      Front fog switch off → on

      		 Below 1 V → 11 to 14 V
      F2-13 (LL) - Body ground LG - Body ground Left turn signal

      Ignition switch ON (IG)

      Left turn indicator light OFF → ON

      		 Below 1 V → 11 to 14 V

      • *1: w/ Fog Light

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


      1. A01UY1HE01

        Waveform 1: Using an oscilloscope

        Terminal Connections

        F1-6 (+S) - Body ground

        F1-5 (SI) - 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 (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    A01V22JE03
    Text in Illustration
    *a Instrument Panel Junction Block Assembly *b

    Main Body ECU

    (Multiplex Network Body ECU)

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

    2. 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
      MB-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω
      MB-29 (ACC) - Body ground None - Body ground Ignition power supply (ACC signal) Ignition switch ACC 11 to 14 V
      MB-30 (BECU) - Body ground None - Body ground +B (power system signal system) power supply Always 11 to 14 V
      MB-32 (IG) - Body ground None - Body ground Ignition power supply (IG signal) Ignition switch ON (IG) 11 to 14 V

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

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

    4. 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
      3A-28 (PKB) - Body ground R - Body ground Parking brake signal Parking brake warning light ON → OFF Below 1 V → 11 to 14 V
      3D-34 (DBKL) - Body ground W - Body ground Front seat inner belt assembly signal (driver side) Driver seat belt warning light OFF → ON Below 1 V → 11 to 14 V
      F57-13 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON (IG) Pulse generation
      F57-14 (CANH) - Body ground R - Body ground CAN communication line Ignition switch ON (IG) Pulse generation

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

  3. COMBINATION METER INTERNAL CIRCUIT

    A01V070E02
    A01UXR2E02
    A01UZT1E02
    A01UZVPE02
    Connectors
    Terminal No. Wire Harness Side
    F1 1 Telltale light assembly (Rear Seat LH)
    2 Telltale light assembly (Rear Seat CENTER)
    3 Telltale light assembly (Rear Seat RH)
    5 Brake booster with master cylinder assembly (skid control ECU)
    6 Other ECU
    7 Occupant detection sensor and Front seat inner belt assembly (Front passenger side)
    9 Engine oil pressure switch assembly
    11 ECM
    14 Body ground
    16 Fuel sender gauge assembly
    19 H-LP LH HI fuse
    20 Panel fuse
    21 Body ground
    24 Rear seat inner belt assembly LH
    25 Rear seat inner belt assembly CENTER
    26 Rear seat inner belt assembly RH
    31 CAN communication line
    32 CAN communication line
    39 IG2 relay
    40 Auxiliary battery
    F2 1 Auxiliary battery
    3 Telltale light assembly
    6 Panel fuse
    7 Turn signal light RH
    9 Headlight dimmer switch assembly (Turn signal switch)
    10 Headlight dimmer switch assembly (Turn signal switch)
    11 FOG RR relay
    12 FOG FR relay*1
    13 Turn signal light LH

    • *1: w/ Fog Light