SEAT BELT WARNING SYSTEM TERMINALS OF ECU

  1. CHECK COMBINATION METER ASSEMBLY

    U123686E02

    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

      Ignition switch ON

      11 to 14 V

      Ignition switch off

      Below 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

      H62-1 (RLMT) - Body ground*1

      R - Body ground

      Rear No. 1 seat belt LH warning light signal

      Rear No. 1 seat belt LH fastened

      11 to 14 V

      Rear No. 1 seat belt LH unfastened

      Below 1 V

      H62-2 (RCMT) - Body ground*1

      W - Body ground

      Rear No. 1 seat center belt warning light signal

      Rear No. 1 seat center belt fastened

      11 to 14 V

      Rear No. 1 seat center belt unfastened

      Below 1 V

      H62-4 (RRMT) - Body ground*1

      B - Body ground

      Rear No. 1 seat belt RH warning light signal

      Rear No. 1 seat belt RH fastened

      11 to 14 V

      Rear No. 1 seat belt RH unfastened

      Below 1 V

      H62-9 (RLBT) - Body ground*2

      G - Body ground

      Rear No. 2 seat belt LH warning light signal

      Rear No. 2 seat belt LH fastened

      11 to 14 V

      Rear No. 2 seat belt LH unfastened

      Below 1 V

      H62-11 (PKB1) - Body ground

      L - 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

      H62-13 (MSD) - Body ground*1

      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*1

      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*1

      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

      H62-27 (RRBT) - Body ground*2

      L - Body ground

      Rear No. 2 seat belt RH warning light signal

      Rear No. 2 seat belt RH fastened

      11 to 14 V

      Rear No. 2 seat belt RH unfastened

      Below 1 V

      H62-34 (MSM+) - Body ground*2

      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*2

      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: w/ Rear No. 1 Seat

      • *2: w/ Rear No. 2 Seat

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

    U122708E01

    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

      Ignition switch ON

      11 to 14 V

      Ignition switch off

      Below 1 V

      DF-5 (ACC) - Body ground

      W - Body ground

      ACC power supply

      Ignition switch ACC

      11 to 14 V

      Ignition switch off

      Below 1 V

      H79-8 (LCTY) - Body ground

      SB - Body ground

      Rear door courtesy light switch LH signal

      Rear door LH open

      Below 1 Ω

      Rear door LH closed

      10 kΩ or higher

      DE-19 (RCTY) - Body ground

      LG - Body ground

      Rear door courtesy light switch RH signal

      Rear door RH open

      Below 1 Ω

      Rear door RH 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