Toyota CH-R Service Manual: System Description

Toyota CH-R Service Manual / Seat Belt / Seat Belt Warning System(w/ Occupant Classification System) / System Description

SYSTEM DESCRIPTION

SEAT BELT WARNING SYSTEM DESCRIPTION

(a) Seat belt warning light operation for driver seat belt:

The seat belt warning light on the combination meter assembly blinks or turns off in accordance with the driver seat belt state and vehicle speed.

(b) Seat belt warning light operation for front passenger seat belt:

The seat belt warning light on the combination meter assembly blinks or turns off in accordance with the whether the front passenger seat is occupied, the front passenger seat belt state or vehicle speed.

The rear seat belt warning light on the clock assembly illuminates or turns off in accordance with the rear door state, vehicle speed and rear seat belt state.

(d) Seat belt warning buzzer:

When the vehicle is driven at 20 km/h (12 mph) or more with the front passenger seat occupied and the driver, front passenger or rear seat belt not fastened, the seat belt warning buzzer in the combination meter assembly will sound at an interval of 1.2 seconds for 30 seconds.

an interval of 0.4 seconds for 90 seconds.

FUNCTION OF MAIN COMPONENTS

Component	Function
Front seat inner belt assembly LH	Informs the airbag sensor assembly of the driver seat belt condition (fastened or unfastened).
Front seat inner belt assembly RH	Informs the occupant detection ECU of the front passenger seat belt condition (fastened or unfastened).
Front occupant classification sensor LH Rear occupant classification sensor LH	Informs the occupant detection ECU of the front passenger seat condition (occupied or unoccupied).
Combination meter assembly	Blinks or turns off the seat belt warning light. Illuminates or turns off the rear seat belt warning light. Sounds the seat belt warning buzzer.
Rear seat inner with center belt assembly LH Rear seat inner belt assembly RH	Informs the combination meter assembly of each rear seat belt condition (fastened or unfastened).
Rear door courtesy light switch assembly (LH/RH)	Informs the main body ECU (multiplex network body ECU) of the rear door condition (open or closed).
Clock assembly	The clock assembly illuminates, blinks or turns off the rear seat belt warning light.
Main body ECU (multiplex network body ECU)	Sends the rear door courtesy switch signal to the combination meter assembly via CAN communication.
Occupant detection ECU	Sends the front passenger seat belt buckle switch signal and occupant detection signal to the airbag sensor assembly via CAN communication.
Airbag sensor assembly	Sends the front passenger seat belt buckle switch signal and occupant detection signal to the combination meter assembly via CAN communication.
Skid control ECU (brake actuator assembly)	Sends the vehicle speed signal to the combination meter assembly via CAN communication.
ECM	Sends the shift position signal to the combination meter assembly via CAN communication.

Precaution

PRECAUTION IGNITION SWITCH EXPRESSIONS HINT: The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are u ...

System Diagram

SYSTEM DIAGRAM FRONT SEAT BELT WARNING Communication Table Sender Receiver Signal Communication Method Airbag sensor assembly ...

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