Bedienungsanleitung Mercedes GLS 2018 (Seite 59 von 398) (Englisch)

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repaired. This will help to make sure the air bags

continue to perform their protective function for

the vehicle occupants in the event of a crash.

WARNING

Emergency Tensioning Devices that have

deployed pyrotechnically are no longer opera-

tional and are unable to perform their inten-

ded protective function. This poses an

increased risk of injury or even fatal injury.

Have pyrotechnically triggered Emergency

Tensioning Devices replaced immediately at a

qualified specialist workshop.

An electric motor is used by PRE-SAFE

to trig-

ger the tightening of the seat belt in hazardous

situations. This procedure is reversible.

If Emergency Tensioning Devices are triggered

or air bags are deployed, you will hear a bang,

and some powder may also be released. The

6 restraint system warning lamp lights up.

Only in rare cases will the bang affect your hear-

ing. The powder that is released generally does

not constitute a health hazard, but it may cause

short-term breathing difficulties in people with

asthma or other respiratory problems. Provided

it is safe to do so, you should leave the vehicle

immediately or open the window in order to pre-

vent breathing difficulties.

Air bags and pyrotechnic Emergency Tensioning

Devices (ETDs) contain perchlorate material,

which may require special handling and regard

for the environment. National guidelines must

be observed during disposal. In California, see

www.dtsc.ca.gov/HazardousWaste/

Perchlorate/index.cfm.

Method of operation

During the first stage of a collision, the restraint

system control unit evaluates important physi-

cal data relating to vehicle deceleration or accel-

eration, such as:

duration

direction

intensity

Based on the evaluation of this data, the

restraint system control unit triggers the Emer-

gency Tensioning Devices during a frontal or

rear collision.

An Emergency Tensioning Device can only be

triggered, if:

the ignition is switched on

the components of the restraint system are

operational. You can find further information

under "Restraint system warning lamp"

(

Y page 45)

the seat belt buckle tongue has engaged in

the belt buckle of the respective front seat

The Emergency Tensioning Devices in the rear

compartment are triggered independently of the

lock status of the seat belts.

If the restraint system control unit detects a

more severe accident, further components of

the restraint system are activated independ-

ently of each other in certain frontal collision

situations:

Front air bags and driver's knee bag

Window curtain air bag, if the system deter-

mines that deployment can offer additional

protection to that provided by the seat belt

The front-passenger front air bag is activated or

deactivated depending on the person on the

front-passenger seat. The front-passenger front

air bag can only deploy in an accident if the

PASSENGER AIR BAG OFF indicator lamp is off.

Observe the information on the PASSENGER AIR

BAG indicator lamps (

Y page 45).

Your vehicle has two-stage front air bags. In the

first deployment stage, the front air bag is filled

with propellant gas. The front air bag is fully

deployed with the maximum amount of propel-

lant gas if a second deployment threshold is

reached within a few milliseconds.

The activation threshold of the Emergency Ten-

sioning Devices and the air bags is determined

by evaluating the rate of vehicle

decelera

tion or

acceleration which occurs at various points in

the vehicle. This process is pre-emptive in

nature. Deployment should take place in good

time at the start of the collision.

The rate of vehicle deceleration or acceleration

and the direction of the force are essentially

determined by:

the distribution of forces during the collision

the collision angle

the deformation characteristics of the vehicle

the characteristics of the object with which

the vehicle has collided

Factors which can only be seen and measured

after a collision has occurred do not play a deci-

sive role in the deployment of an air bag. Nor do

Occupant safety

Safety

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Mercedes GLS 2018 Seite 59

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