Restraints and Safety Systems: Description and Operation

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) "AIR BAG" AND "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER" used along with a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. The SRS composition which is available to INFINITI QX4 is as follows:

For a Frontal Collision
The Supplemental Restraint System consists of:
* Driver Air Bag Module (located in the center of the steering wheel)
* Front Passenger Air Bag Module (located on the instrument panel on passenger side)
* Seat Belt Pre-Tensioners
* Diagnosis Sensor Unit
* Warning Lamp
* Wiring Harness
* Spiral Cable


For a Side Collision
The Supplemental Restraint System consists of:
* Side Air Bag Module (located in the outer side of front seat)
* Satellite Sensor
* Diagnosis Sensor Unit (one of components of air bags for a frontal collision)
* Wiring Harness
* Warning Lamp (one of components of air bags for a frontal collision).






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 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 above.






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






Seat Belt Pre-tensioner with Load Limiter
The seat belt pre-tensioner system with load limiter is installed to 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.