SEAT BELT WARNING SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER

    A004NMBE02

    1. Disconnect the D66 meter 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
      D66-40 (B) - Body ground W - Body ground Combination meter +B line Always 11 to 14 V
      D66-39 (IG+) - Body ground P - Body ground Combination meter IG line Ignition switch ON 11 to 14 V
      D66-21 (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 D66 meter connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D66-11 (PKBI) - Body ground

      L - Body ground*1

      P - Body ground*2

      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
      D66-13 (MSD) - Body ground Y - Body ground Rear seat belt LH signal Rear seat belt LH fastened Below 1 V
      Rear seat belt LH unfastened 11 to 14 V
      D66-14 (MSTI) - Body ground P - Body ground Rear seat center belt signal Rear seat center belt fastened Below 1 V
      Rear seat center belt unfastened 11 to 14 V
      D66-15 (MSFM) - Body ground B - Body ground Rear seat belt RH signal Rear seat belt RH fastened Below 1 V
      Rear seat belt RH unfastened 11 to 14 V
      D66-34 (RRMT) - Body ground B - Body ground Rear seat belt RH warning light signal Rear seat belt RH fastened within 30 seconds of opening rear door with ignition switch ON 11 to 14 V
      Rear seat belt RH unfastened within 30 seconds of opening rear door with ignition switch ON Below 1 V
      D66-35 (RCMT) - Body ground P - Body ground Rear seat center belt warning light signal Rear seat center belt fastened within 30 seconds of opening rear door with ignition switch ON 11 to 14 V
      Rear seat center belt unfastened within 30 seconds of opening rear door with ignition switch ON Below 1 V
      D66-36 (RLMT) - Body ground Y - Body ground Rear seat belt LH warning light signal Rear seat belt LH fastened within 30 seconds of opening rear door with ignition switch ON 11 to 14 V
      Rear seat belt LH unfastened within 30 seconds of opening rear door with ignition switch ON Below 1 V

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

      *1: for LHD

      *2: for RHD

  2. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    A004NX8E02

    1. Disconnect the DB, DE, DF and DG junction block connectors.

    2. Disconnect the D79 ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      DE-17 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      DG-1 (ALTB) - Body ground W - Body ground Battery (ECU power source) Always 11 to 14 V
      DB-30 (BECU) - Body ground W - Body ground Battery (ECU power source) Always 11 to 14 V
      DF-3 (IG) - Body ground W - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      DF-5 (ACC) - Body ground W - Body ground Ignition power supply Ignition switch ACC 11 to 14 V
      D79-8 (LCTY) - Body ground SB - Body ground Rear door courtesy light switch LH signal Rear LH door open Below 1 Ω
      Rear LH door closed 10 kΩ or higher
      DE-19 (RCTY) - Body ground LG - Body ground Rear door courtesy light switch RH signal Rear RH door open Below 1 Ω
      Rear RH door closed 10 kΩ or higher

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

    4. Reconnect the DB, DE, DF and DG junction block connectors.

    5. Reconnect the D79 ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D79-26 (DBKL) - Body ground

      P - Body ground*1

      L - Body ground*2

      Driver seat belt warning signal Driver seat belt fastened 11 to 14 V
      Driver seat belt unfastened Below 1 V

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

      *1: for LHD

      *2: for RHD