SEAT BELT WARNING SYSTEM(w/ Occupant Classification System) SYSTEM DESCRIPTION


  1. SEAT BELT WARNING SYSTEM DESCRIPTION

    Tech Tips

    The front seat belt warning light on the combination meter assembly is used for both the driver side seat and front passenger side seat.


    1. Front seat belt warning light operation for driver side seat belt:

      The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with the driver seat belt state, vehicle speed, shift lever position and parking brake state.

    2. Front seat belt warning light operation for front passenger side seat belt:

      The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with whether the front passenger seat is occupied, the front passenger seat belt state, vehicle speed, shift lever position and parking brake state.

    3. Seat belt warning buzzer:

      After turning the power switch on (IG), if the driver seat belt is not fastened within 1.8 seconds, check that the seat belt warning buzzer in the combination meter assembly sounds at 1.2 second intervals for 6 seconds.

      When the vehicle is driven at 20 km/h (12 mph) or more with the front passenger seat occupied and the driver or front passenger seat belt not fastened, the seat belt warning buzzer in the combination meter assembly sounds once.

      When 24 seconds have passed after the buzzer sounded, the seat belt warning buzzer in the combination meter assembly sounds at an interval of 1.2-second for 9.6 seconds.

      After that, the seat belt warning buzzer in the combination meter assembly sounds at an interval of 0.4 seconds for 20 seconds.

  2. FUNCTION OF MAIN COMPONENT

    The following functions are available.
    Components Function
    Front seat inner belt assembly LH Informs airbag ECU assembly of driver side seat belt condition (fastened or unfastened).
    Front seat inner belt assembly RH Informs occupant detection ECU of front passenger side seat belt condition (fastened or unfastened).
    Occupant detection ECU Sends the front passenger side seat belt buckle switch signal and occupant detection signal to the airbag ECU assembly.

    Front occupant classification sensor LH

    Rear occupant classification sensor LH

    		 Informs the occupant detection ECU of the front passenger seat condition (occupied or unoccupied).
    Airbag ECU assembly

    • Sends the driver side seat belt buckle switch signal to the main body ECU (multiplex network body ECU) via CAN communication.

    • Sends the front passenger side seat belt buckle switch and occupant detection signal to the combination meter assembly via CAN communication.
    Main body ECU (multiplex network body ECU)

    • Sends the driver side seat belt buckle switch signal to the combination meter assembly via CAN communication.

    • Sends the parking brake switch signal to the combination meter assembly via CAN communication.
    Brake booster with master cylinder assembly (skid control ECU) Sends the vehicle speed signal to the combination meter assembly via CAN communication.
    Hybrid vehicle control ECU Sends the shift position signal to the combination meter assembly via CAN communication.
    Parking brake ECU assembly Sends the parking brake switch signal to the combination meter assembly via CAN communication.