Seatbelts and Airbags

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Supplemental Restraint Systems.

What happens when an air bag is deployed?

During deployment, an air bag inflates within a small fraction of a second during theactual collision in order to provide the occupant with additional protection beyond that

affordedby the seat belt. As inflation must be very rapid to affordprotection in the veryshort accident sequence, deployment results with a relatively loud noise. When theoccupant is properly positioned, contact between the occupant and the inflated air baghelps prevent or reduce the severity of the occupants striking interior surfaces ofthevehicle.

The front air bag or side impact air bag will deflate through vent holes or a permeablefabric after inflation in order to provide the intended occupant restraint. The gases thatare used to inflate the air bag are hot when expelled from the inflator into the air bagitself and cool down relatively rapidly when they mix with the atmosphere within thevehicle. However, escaping gases can cause injury if body parts such as hands come intocontact with them. Additionally, the inflator remains hot and should not be touched after

inflation. Also, air bag inflation can result in some harmless smoke or dust beingreleased into the passenger compartment.

Available restraint systems for the E-Class (W 211)


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A front air bag will not be deployed in a lateral rollover unless the rollover alsogenerates a longitudinal deceleration rate meeting the systems deployment thresholdsensed early in the collision.

Special features of dual-stage front air bags.

If the vehicle is equipped with dual-stage front air bags, the front air bag is initiallyinflated with a single inflator when a first activation threshold is reached. If a secondthreshold is reached, within the few milliseconds in which the determination to deploy ismade, a second inflator provides additional inflation to increase the inflation rate oftheairbag to help address the higher deceleration rate sensed with respect to the accident.If the vehicle is equipped with a front passenger weight classification system, the bodyweight of the front passenger is taken into account along with the accident severity andthe seat belt status when calculating the air bag inflation rate.

Knee air bags supplement the function of the knee bolster in head-on collisions thatexceed the deployment threshold.

Advanced Systems.

Special features of an Occupant Classification System.

If your vehicle is equipped with an Occupant Classification System (OCS), itautomatically turns the passenger front air bag on oroffbased on the classified occupantsize category, determined by weight sensor readings from the front passenger seat.

The system is not designed to deactivate a side impact air bag or window curtain air

bag. IfOCS classified the occupant sitting in the front passenger seat as an adult, the

passenger front air bag will be enabled and deploy in an accident meeting the respectiveair bag deployment criteria. IfOCS classified the front passenger seat occupant as a smalloccupant, depending on weight, the passenger front air bag may or may not be enabled.

The passenger front air bag will be disabled and the PASS AIR BAGOFF indicator lamp islit, if the system:

classified the front passenger seat occupant as child-sized at a certain weight level or

classified the front passenger seat as empty.

In order forOCS to classify the front seat passenger as it is intended to operate, the front

passenger seat occupant must always be seated and belted properly (seat backnearlyupright, back against the seatback and feet on the floor). In addition, any circumstancethat results in the system misreading the passenger seat occupants correct weightcategory must be avoided (forexample transferring the passenger weight to the armrestby leaning on it, attaching objects to the seatback or putting items under, on oraroundthe seat or seat back). You need to make sure that the passenger front seat has clearancein all directions at all times. Otherwise the OCS may not be able to properly approximate


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Seatbelts and Airbags

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