SEAT BELT WARNING SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY

    A01VFT3E02

    1. Disconnect the combination meter assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F1-40 (B) - Body ground L - Body ground Combination meter +B line Always 11 to 14 V
      F1-39 (IG+) - Body ground P - Body ground Combination meter IG line Ignition switch ON 11 to 14 V
      F1-21 (ET) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the 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
      F1-7 (P/SB) - Body ground P - Body ground Front passenger seat belt signal Front passenger seat occupied, seat belt fastened Below 1 V
      Front passenger seat occupied, seat belt unfastened 11 to 14 V
      F1-24 (RLSB) - Body ground V - Body ground Rear seat belt LH signal Rear seat belt LH fastened Below 1 V
      Rear seat belt LH unfastened 11 to 14 V
      F1-25 (RCSB) - Body ground R - Body ground Rear seat center belt signal Rear seat center belt fastened Below 1 V
      Rear seat center belt unfastened 11 to 14 V
      F1-26 (RRSB) - Body ground BE - Body ground Rear seat belt RH signal Rear seat belt RH fastened Below 1 V
      Rear seat belt RH unfastened 11 to 14 V
      F1-1 (RLMT) - Body ground GR - Body ground Rear seat belt LH warning signal Rear seat belt LH fastened Below 1 V
      Rear seat belt LH unfastened 11 to 14 V
      F1-2 (RCMT) - Body ground G - Body ground Rear seat center belt warning signal Rear seat center belt fastened Below 1 V
      Rear seat center belt unfastened 11 to 14 V
      F1-3 (RRMT) - Body ground B - Body ground Rear seat belt RH warning signal Rear seat belt RH fastened Below 1 V
      Rear seat belt RH unfastened 11 to 14 V

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

  2. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    • A01VJ2CE02
      Text in Illustration
      *A for LHD *B for RHD
      *1 Instrument Panel Junction Block Assembly *2 Main Body ECU (Multiplex Network Body ECU)

    1. Remove the main body ECU from the instrument panel junction block assembly Click here.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-31 (ALTB) - Body ground - Battery (ECU power source) Always 11 to 14 V
      MB-30 (BECU) - Body ground - Battery (ECU power source) Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply Ignition switch ON 11 to 14 V
      MB-29 (ACC) - Body ground - Ignition power supply Ignition switch ACC 11 to 14 V
      F76-6 (LRCY) - Body ground G - Body ground Rear door courtesy light switch signal Rear door open Below 1 Ω
      Rear door closed 10 kΩ or higher
      MB-2 (FLCY) - Body ground - Front door courtesy light switch LH signal Front door LH open Below 1 Ω
      Front door LH closed 10 kΩ or higher
      F76-19 (FRCY) - Body ground Y - Body ground Front door courtesy light switch RH signal Front door RH open Below 1 Ω
      Front door RH closed 10 kΩ or higher

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

    3. Install the main body ECU to the instrument panel junction block assembly 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
      3D-34 (DBKL) - Body ground W - Body ground Driver seat belt warning signal Driver seat belt fastened 11 to 14 V
      Driver seat belt unfastened Below 1 V
      F76-13 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      F76-14 (CANH) - Body ground R - Body ground CAN communication line Ignition switch ON Pulse generation

      If the result is not as specified, the main body ECU may have a malfunction.