SEAT BELT WARNING SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY

    A01IOCCE26

    1. Disconnect the H62 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
      H62-40 (B) - Body ground W - Body ground Battery power supply Always 11 to 14 V
      H62-39 (IG+) - Body ground P - Body ground IG power supply IG switch ON 11 to 14 V
      IG switch off Blow 1 V
      H62-21 (ET) - Body ground BR - Body ground Ground Always Below 1 Ω

    3. Reconnect the H62 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
      H62-11 (PKBI) - Body ground

      L - Body ground*1

      B - 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
      H62-13 (MSD) - Body ground*3 R - Body ground Rear No. 1 seat belt LH signal Rear No. 1 seat belt LH fastened Below 1 V
      Rear No. 1 seat belt LH unfastened 11 to 14 V
      H62-14 (MSTI) - Body ground*3 W - Body ground Rear No. 1 seat center belt signal Rear No. 1 seat center belt fastened Below 1 V
      Rear No. 1 seat center belt unfastened 11 to 14 V
      H62-15 (MSFM) - Body ground*3 B - Body ground Rear No. 1 seat belt RH signal Rear No. 1 seat belt RH fastened Below 1 V
      Rear No. 1 seat belt RH unfastened 11 to 14 V
      H62-34 (MSM+) - Body ground*4 G - Body ground Rear No. 2 seat belt LH signal Rear No. 2 seat belt LH fastened Below 1 V
      Rear No. 2 seat belt LH unfastened 11 to 14 V
      H62-35 (MS+) - Body ground*4 L - Body ground Rear No. 2 seat belt RH signal Rear No. 2 seat belt RH fastened Below 1 V
      Rear No. 2 seat belt RH unfastened 11 to 14 V

      • *1: for RHD

      • *2: for LHD

      • *3: w/ Rear No. 1 Seat

      • *4: w/ Rear No. 2 Seat

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

    A01IOG6E03

    1. Disconnect the DB, DE, DF, DG and H79 main body ECU connectors.

    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
      DE-28 (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 IG power supply IG switch ON 11 to 14 V
      IG switch off Blow 1 V
      DF-5 (ACC) - Body ground W - Body ground ACC power supply IG switch ACC 11 to 14 V
      IG switch off Blow 1 V
      H79-8 (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

    3. Reconnect the DB, DE, DF, DG and H79 main body ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H79-26 (DBKL) - Body ground P - Body ground Driver seat belt warning signal Driver seat belt fastened 11 to 14 V
      Driver seat belt unfastened Below 1 V