Mercedes-benz 2013 CLA Class User Manual download pdf (Page 43)

Airbag deployment only provides increased

protection if the seat belt is worn correctly.

The seat belt helps, firstly, to keep the vehicle

occupant in the best position in relation to the

airbag. Secondly, in a head-on collision, for

example, the seat belt restricts movement of

the vehicle occupant towards the point of

impact.

SRS (Supplemental Restraint System)

Introduction

Supplemental Restraint System (SRS) with:

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the 6 SRS warning lamp

R

airbags

R

airbag control unit (with crash sensors)

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belt tensioners for the front seat belts and

the outer seat belts in the rear

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seat belt force limiters for the front seat

belts and the outer seat belts in the rear

SRS reduces the risk of vehicle occupants

coming into contact with parts of the vehi-

cle's interior in the event of an accident. It can

also reduce the forces to which vehicle occu-

pants are subjected during an accident.

SRS warning lamp

G

WARNING

If SRS is malfunctioning, child restraint sys-

tem components may be triggered uninten-

tionally or might not be triggered at all in the

event of an accident with a high rate of vehicle

deceleration. There is an increased risk of

injury, possibly even fatal.

Have SRS checked and repaired immediately

at a qualified specialist workshop.

SRS functions are checked regularly when

you switch on the ignition and when the

engine is running. Therefore, malfunctions

can be detected in good time.

The 6 SRS warning lamp in the instrument

cluster lights up when the ignition is switched

on. It goes out no later than a few seconds

after the engine is started.

The SRS components are in operational read-

iness when the 6 SRS warning lamp goes

out while the engine is running.

A malfunction has occurred if:

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the 6 SRS warning lamp does not light

up when the ignition is switched on

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the engine is running and the 6 SRS

warning lamp does not go out after a few

seconds

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the engine is running and the 6 SRS

warning lamp lights up again

Triggering of belt tensioners and air-

bags

During the first stage of a collision, the airbag

control unit evaluates important physical

data relating to vehicle deceleration or accel-

eration, such as:

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duration

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direction

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magnitude

Based on the evaluation of this data, the air-

bag control unit pre-emptively triggers the

belt tensioners in the first stage.

If there is an even higher rate of vehicle decel-

eration or acceleration in a longitudinal direc-

tion, the front airbags are also deployed.

Your vehicle has adaptive, two-stage front air-

bags. The airbag control unit evaluates vehi-

cle deceleration or acceleration in the event

of a collision. In the first deployment stage,

the front airbag is filled with enough propel-

lant gas to reduce the risk of injuries. The

front airbag is fully deployed if a second

deployment threshold is reached within a few

milliseconds.

The belt tensioner and airbag triggering

thresholds are variable and are adapted to the

detected rate of deceleration or acceleration

of the vehicle. This process is pre-emptive in

nature. The triggering process must take

place in good time at the start of the collision.

Occupant safety

41

Safety

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