Air Bag Systems: Description and Operation

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)




SRS Configuration
The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in the ON or START position.
The collision modes for which supplemental restraint systems are activated are different among the SRS systems. For example, the driver air bag module and front passenger air bag module are activated in a frontal collision but not in a side collision.




SRS configurations which are activated for some collision modes are as shown in the table.




Front Seat Belt Pre-Tensioner with Load Limiter
The seat belt pre-tensioner system with load limiter is installed for both the driver's seat and the front passenger's seat. It operates simultaneously with the SRS air bag system in the event of a frontal collision with an impact exceeding a specified level.

When the frontal collision with an impact exceeding a specified level occurs, seat belt slack resulting from clothing or other factors is immediately taken up by the pre-tensioner. Vehicle passengers are securely restrained.

When passengers in a vehicle are thrown forward in a collision and the restraining force of the seat belt exceeds a specified level, the load limiter permits the specified extension of the seat belt by the twisting of the ELR shaft, and a relaxation of the chest-area seat belt web tension while maintaining force.




Front Side Air Bag
Front side air bag is built-in type.
The front seat-backs with built-in type side air bag have the labels as shown.




Side Curtain Air Bag
The side curtain air bags have the labels as shown.

Occupant Classification System (OCS)
The occupant classification system identifies different size occupants, out of position occupants, and detects if child seat is present in the front passenger seat. The occupant classification system receives inputs from the occupant classification sensor (located inside the passenger seat cushion assembly) and belt tension sensor (part of the passenger front seat belt assembly and located at the belt anchor location). Depending on classification of passenger, the occupant classification system sends a signal to the diagnosis sensor unit. The diagnosis sensor unit uses this signal to determine full, partial, or non deployment of passenger front air bag in the event of a collision. Depending on the signal received, the diagnosis sensor unit can disable the passenger front air bag completely.

NOTE: In case of customer concern, CONSULT-II can be used to confirm the passenger air bag status (readiness).




Passenger Air Bag Status Condition