SEAT BELT WARNING SYSTEM(w/o Occupant Classification System) TERMINALS OF ECU

  1. CHECK COMBINATION METER ASSEMBLY

    E161130N05

    1. Disconnect the G16 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

      G16-40 (B) - Body ground

      Y - Body ground

      Battery power supply

      Always

      11 to 14 V

      G16-39 (IG+) - Body ground

      B - Body ground*1

      P - Body ground*2

      IG power supply

      Ignition switch ON

      11 to 14 V

      Ignition switch off

      Below 1 V

      G16-21 (ET) - Body ground

      BR - Body ground

      Ground

      Always

      Below 1 Ω

      *1: w/o Stop and Start System

      *2: w/ Stop and Start System

    3. Reconnect the G16 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

      G16-1 (RLMT) - Body ground*3

      B - Body ground

      Rear seat belt LH warning light signal

      Rear seat belt LH fastened

      Below 1 V

      Rear seat belt LH unfastened

      11 to 14 V

      G16-2 (RCMT) - Body ground*3

      G - Body ground

      Rear seat center belt warning light signal

      Rear seat center belt fastened

      Below 1 V

      Rear seat center belt unfastened

      11 to 14 V

      G16-3 (RRMT) - Body ground*3

      L - Body ground

      Rear seat belt RH warning light signal

      Rear seat belt RH fastened

      Below 1 V

      Rear seat belt RH unfastened

      11 to 14 V

      G16-7 (P/SB) - Body ground

      L - Body ground

      Front passenger side seat belt warning light signal

      Front passenger seat occupied, seat belt fastened

      Below 1 V

      Front passenger seat occupied, seat belt unfastened

      11 to 14 V

      G16-24 (RLSB) - Body ground*3

      G - Body ground

      Rear seat belt LH buckle switch signal

      Rear seat belt LH fastened

      Below 1 V

      Rear seat belt LH unfastened

      11 to 14 V

      G16-25 (RCSB) - Body ground*3

      B - Body ground

      Rear seat center belt buckle switch signal

      Rear seat center belt fastened

      Below 1 V

      Rear seat center belt unfastened

      11 to 14 V

      G16-26 (RRSB) - Body ground*3

      W - Body ground

      Rear seat belt RH buckle switch signal

      Rear seat belt RH fastened

      Below 1 V

      Rear seat belt RH unfastened

      11 to 14 V

      *3: w/ Rear Seat Belt Warning System

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

    C278789N01
    C278790C02

    *A

    Main Body ECU (Multiplex Network Body ECU) with 1 connector

    *B

    Main Body ECU (Multiplex Network Body ECU) with 3 connectors

    1. Disconnect the 3A, 3B, 3D, 3E and G78 main body ECU (multiplex network 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

      3D-9 (GND1) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      3B-16 (BECU) - Body ground

      R - Body ground

      Battery power supply

      Always

      11 to 14 V

      3D-40 (IG) - Body ground

      L - Body ground

      IG power supply

      Ignition switch ON

      11 to 14 V

      Ignition switch off

      Below 1 V

      3A-1 (ACC) - Body ground

      W - Body ground

      ACC power supply

      Ignition switch ACC

      11 to 14 V

      Ignition switch off

      Below 1 V

      G78-24 (LCTY) - Body ground*3

      W - Body ground*1

      SB - Body ground*2

      Rear door courtesy light switch LH signal

      Rear LH door open

      Below 1 Ω

      Rear LH door closed

      10 kΩ or higher

      G78-6 (RCTY) - Body ground*3

      Y - Body ground

      Rear door courtesy light switch RH signal

      Rear RH door open

      Below 1 Ω

      Rear RH door closed

      10 kΩ or higher

      *1: for LHD

      *2: for RHD

      *3: w/ Rear Seat Belt Warning System

    3. Reconnect the 3A, 3B, 3D, 3E and G78 main body ECU (multiplex network 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

      3E-34 (DBKL) - Body ground*1

      R - Body ground

      Driver side seat belt buckle switch signal

      Driver side seat belt fastened

      Below 1 V

      Driver side seat belt unfastened

      11 to 14 V

      3C-40 (DBKL) - Body ground*2

      R - Body ground

      Driver side seat belt buckle switch signal

      Driver side seat belt fastened

      Below 1 V

      Driver side seat belt unfastened

      11 to 14 V

      3D-34 (PKB) - Body ground

      B - Body ground

      Parking brake switch signal

      Ignition switch ON, parking brake switch off

      11 to 14 V

      Ignition switch ON, parking brake switch on

      Below 1.5 V

      *1: for LHD

      *2: for RHD