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


  1. CHECK COMBINATION METER ASSEMBLY

    A00YTYKN05

    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)

    A00YV8EN01
    A00YX3RC02
    *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