MERCEDES-BENZ B-CLASS SPORTS 2014 Service Manual

Useful information
..............................40
Panic alarm .......................................... 40
Occupant safety .................................. 40
Children in the vehicle ........................56
Driving safet ysystems ....................... 63
Thef tdeterrent locking system .........70 39Safety

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please not ethat your vehicle may
not be equipped with all features
described. This also applies to safety-
related system sand functions.
i Read the information on qualified
specialist workshops: (Y page 25).Panic alarm
X
To activate: press0004button 001Afor at
least one second.
An alarm sounds and the exterior lighting
flashes.
X To deactivate: press0004button 001A
again.
or
X Insert the SmartKey int othe ignition lock. Occupant safety
Important safet
ynotes G
WARNING
Modifications to the restraint system scould
result in them not functioning properly any
more. The restraint system scould then no longer protect vehicle occupants as they are
designed to do and could fail in the even
tof
an acciden toractivat eunexpectedly, for
example. Ther eisanincreased risk of injury.
Never modify part softherestraint systems.
Do no tattemp ttomodify the wiring as well as
electronic components or their software.
If it is necessary to modify an air bag system
to accommodat eaperson with disabilities,
contact an authorized Mercedes-Benz center.
USA only: for further information contact our
Customer Assistance Center at
1-800-FOR-MERCedes (1800-367-6372).
In this section ,you will learn the most
important facts about the restraint system
components of the vehicle.
The restraint system consist sof:
R Seat belts
R Child restraint systems
R LATCH-type (ISOFIX) child seat securing
system
Additional protection is provided by:
R SRS (Supplemental Restraint System)
R Air bag system components with:
-PASSENGER AIR BAG OFF indicator lamp
- Front-passenger seat with Occupant
Classification System (OCS)
Although the systems are independent ,their
protective functions work in conjunction with
each other. Not all air bags are always
deployed in an accident.
i For information on infant sand children
traveling with you in the vehicle restraint
systems for infant sand children, see
"Children in the vehicle" (Y page 56). SRS (Supplemental Restraint System)
Introduction Supplemental Restraint System (SRS) with:
R
The 0021 SRS warning lamp
R Air bags 40
Occupant safetySafety

R
Air ba gcontro lunit( with crash sensors)
R Emergenc yTensioning Device for th efront
seat belt sand th eoute rseat belts in the
rear
R Seat belt forc elimiter for the fron tseat
belts and the outer seat belts in the rear
SRS reduces the risk of vehicle occupants
comin gintoc ontact with parts of the
vehicle's interior in the event of an accident.
It can also reduce the forces to which vehicle
occupants are subjected during an accident.
SRS warning lamp G
WARNING
If SRS is malfunctioning, child restraint
system component smay be triggered
unintentionally or might not be triggered at all
in the event of an acciden twith ahigh rate of
vehicle deceleration. There is an increased
risk of injury, possibly even fatal.
Have SRS checked and repaire dimmediately
at aq ualified specialist workshop.
SRS function sare checked regularly when
you switc honthe ignition and when the
engin eisrunning. Therefore, malfunctions
can be detected in good time.
The 0021 SRS warnin glamp in the instrument
cluster light supwhen the ignition is switched
on. It goes out no later than afew seconds
after the engin eisstarted.
The SRS component sare in operational
readiness when the 0021SRS indicator lamp
goes out while the engin eisrunning.
There is amalfunction if:
R the 0021 SRS warnin glamp does not light
up when the ignition is switched on
R the engin eisrunning and the 0021SRS
warnin glamp does not go out after afew
seconds
R the engin eisrunning and the 0021SRS
warnin glamp light supagain Triggering of Emergency Tensioning
Devices and air bags Durin
gthe firs tstag eofac ollision, the ai rbag
control unit evaluates important physical
dat arelating to vehicle deceleratio nor
acceleration, suc has:
R duration
R direction
R magnitude
Based on th eevaluation of this data, th eair
bag control unit pre-emptivel ytrigger sthe
Emergency Tensioning Devic einthefirst
stage.
If there is an eve nhigher rat eofvehicle
deceleratio noracceleration in alon gitudinal
direction, the front ai rbags are also deployed.
Your vehicle has adaptive, two-stag efront air
bags. The air bag control unit evaluates
vehicle deceleration or acceleration in the
even tofa collision. In the firs tdeployment
stage, the fron tair bag is filled with enough
propellan tgas to reduc ethe ri sk of injuries.
The front air bag is fully deployed if asecond
deploymen tthreshold is reached within afew
milliseconds.
The Emergency Tensioning Device and air bag
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.
The rate of vehicle deceleration or
acceleration and the direction of the force are
essentially determined by:
R the distribution of forces during the
collision
R the collision angle
R the deformation characteristics of the
vehicle
R the characteristics of the object with which
the vehicle has collided
Factors that can only be seen and measured
after acollision has occurred do not play a Occupant safety
41Safety Z

decisive role in the deployment of an air bag,
nor do they provide an indication of air bag
deployment.
The vehicle may be deformed significantly,
e.g. the hood or the fender ,without an air bag
being deployed. This is the case if only parts
which are relatively easily deformed are
affected and the rate of deceleration is not
high. Conversely, air bags may be deployed
even though the vehicle suffers only minor
deformation. This is the case if, for example,
very rigid vehicle parts such as longitudinal
body members are hit, and sufficient
deceleration occurs as aresult.
i The fron tEmergenc yTensioning Devices
can only be triggered if the seat belt
tongues on the fron tseats are correctly
engaged in the seat belt buckles.
i Not all air bags are deployed in an
accident. The differen tair bag systems
work independently of each other.
How the air bag system work sis
determined by predictin gthe severity of
the accident ,especially vehicle
deceleration or acceleration, and the type
of accident:
R head-on collision
R side impact
R rollover
Safety guidelines for seat belts,
Emergency Tensioning Devices (ETDs)
and air bags G
WARNING
R Damaged seat belts or seat belts that have
been subjected to stress in an accident
must be replaced. Their anchorin gpoints
must also be checked. Only use seat belts
installed or supplied by an authorized
Mercedes-Ben zCenter.
R Air bags and pyrotechnic Emergency
Tensionin gDevices (ETDs) contain
perchlorat ematerial, which may require
special handlin gand regar dfor the environment. Check your national disposal
guidelines. In California, see
www.dtsc.ca.gov/HazardousWaste/
Perchlorate/index.cfm.
R Air bags and ETD sare designed to function
on aone-time-only basis. An air bag or ETD
that has deployed must be replaced.
R Do not pass seat belts over sharp edges.
They could tear.
R Do not make any modification that could
change the effectiveness of the seat belts.
R Do not bleach or dye seat belts ,asthis may
severely weaken them. In acrash, the ymay
not be able to provide adequate protection.
R Do not make any modifications to the SRS
wirin gorc omponents.
R Do not modif yorremove any components
or part softhe SRS.
R Do not install additional trim material, seat
covers, badges, etc .tothe:
- padded steering wheel boss
- knee bag covers
- front-passenger air bag cover
- outer side of front seat bolsters
- outer seat bolsters of the rear bench seat
backrest
- roof frame trim
R Do not install additional electrical/
electronic equipment on or near SRS
components and wiring.
R Keep the area between the air bags and
occupant sfree of object s(e.g. packages,
handbags, umbrellas etc.).
R Do not hang any objects such as coat
hangers on the coat hooks or the grab
handle above the door. These items may be
thrown around in the vehicle and cause
head and other injuries when the window
curtain air bag is deployed.
R Air bag system componentsw ill be hot after
an air bag has inflated. Do not touch them.
R Never rest your feet on the dashboard or
the seat. Always keep both feet on the floor
in fron tofthe seat. 42
Occupant safetySafety

R
Improper repairw ork on the SRS creates a
risk of rendering the SRS inoperative or
causing unintended air bag deployment.
Work on the SRS must therefor eonly be
performed by qualified technicians.
Consult an authorized Mercedes-Benz
Center.
R For your protection and the protection of
others, when scrapping the air bag unit or
ETD, our safety instructions must be
followed. These are available from any
authorized Mercedes-Benz Center.
R Given the considerable deployment speed,
required inflation volume, and the material
of the air bags, there is the possibility of
abrasions or other, potentially more serious
injuries resulting from air bag deployment.
If you sell your vehicle, Mercedes-Benz
strongly recommends that you inform the
subsequent owner that the vehicle is
equipped with SRS. Also, refer them to the
applicabl esection in the Operator's Manual. Air bags
Important safety notes NEVERu
searearward facing child restraint
system on aseat protected by an ACTIVE AIR
BAG in front of it, DEATH or SERIOUS INJURY
to the CHILD can occur. G
WARNING
Using unsuitable seat covers could restric tor
even preven tdeployment of the air bags
integrated into the seats. Consequently, the
air bags cannot protec tvehicle occupant sas
they are designed to do. In addition, the
function of the air bag deactivation system
could be restricted. This poses an increased
risk of injury or even fatal injury.
You should only use seat cover sthat have
been approved for the respective seat by
Mercedes-Benz. G
WARNING
The air bag parts are hot after the airbag has
been deployed. There is arisk of injury.
Do not touch the air bag parts. Have the
deployed air bags replaced at aqualified
specialist workshop as soon as possible. G
WARNING
Air bags are designed to reduce the incidence
of injuries and fatalities in certain situations:
R frontal impacts (driver's and front-
passenger fron tair bags and driver's knee
bag)
R side impact s(side impact air bags and
window curtain air bags)
R rollover (window curtain air bags)
However, no system available today can
completely eliminate injuries and fatalities.
When the air bags are deployed, asmall
amount of powder is released .The powder
generally does not constitute ahealth hazard
and does not indicate that there is afire in the
vehicle. In order to prevent potential
breathing difficulties, you should leave the
vehicle as soon as it is safe to do so. If you
have any breathing difficulty but cannot get
out of the vehicle after the air bag inflates,
then get fresh air by opening awindow or
door. G
WARNING
In order to reduce the potential danger of
injuries caused during the deployment of the
front air bags, the driver and front passenger
must always be correctly seated and wear
their seat belts.
For maximum protection in the event of a
collision, you must always be in the normal
seat position with your back against the
backrest. Fasten your seat belt and make sure
that it is correctly positioned on your body. Occupant safety
43Safety
Z

As the ai
rbag inflate swith considerable
spee dand force, aproper seating position
and correc tpositioning of th ehands on the
steering wheel will help to keep you at asafe
distanc efromt heair bag. Occupants who are
no tw earing their seat belt, are not seated
properly or are too close to the air bag can be
seriously injured or killed by an air bag, as it
inflates with great forc einstantaneously:
R sit with the seat belt fastened correctly and
in ap osition that is as upright as possible
with your back against the backrest.
R move the driver's seat as far back as
possible, still permitting proper operation
of vehicle controls. The distanc efrom the
center of the driver's chest to the center of
the air bag cover on the steerin gwheel
must be at least 10 inches (25 cm). You
should be able to accomplish this by
adjustin gthe seat and steerin gwheel. If
you have any difficulties, please contact an
authorized Mercedes-Benz Center.
R do not lean your head or chest close to the
steerin gwheel or dashboard.
R only hold the steerin gwheel on the outside.
Placing hands and arms inside the rim can
increase the risk and potential severit yof
hand/arm injury if the driver fron tair bag
inflates.
R adjust the front-passenger seat as far back
as possible from the dashboard when the
seat is occupied.
R occupants, especially children ,should
never place their bodies or lean their heads
in the area of the door where the side
impact air bag inflates .This could result in
serious or fatal injuries should the side
impact air bag be deployed. Always sit as
upright as possible, wear the seat belt
properly and use an appropriately sized
infant restraint,t oddler restraint or booster
seat recommended for the size and weight
of the child.
Failure to follow these instructions can result
in severe injuries to you or other occupants. If you sell your vehicle, it is important that you
make the buyer aware of this safety
information. Be sure to give the buyer this
Operator's Manual.
If the air bags are deployed, you will hear a
bang, and asmall amount of powder may also
be released. Only in rare cases will the bang
affect your hearing. The powder that is
released generally does not constitute a
health hazard and does not indicate that there
is af ire in the vehicle. The dust might cause
some temporary breathing difficulty for
people with asthma or other breathing
trouble. To avoid this, you may wish to get out
of the vehicle as soon as it is safe to do so.
You can also open the window to allow fresh
air to enter the vehicle interior. The 0021SRS
warning lamp lights up.
The air bag installation locations are
identified by the AIR BAG symbol.
The air bags are deployed if the air bag control
unit detects the need for deployment.O nly in
the event of such asituatio nwill the air bags
provide their supplemental protection.
If the drive rand front passenge rdonot wear
their seat belts, it is not possible for the air
bags to provide their supplemental
protection.
In the event of other types of impacts and
impacts below air bag deployment
thresholds, the air bags will not deploy. The
driver and passenger will then be protected
to the extentp ossible byaproperly fastened
seat belt. Aproperl yfastened seat beltisa lso
needed to provide the best possible
protection in arollover.
Air bags provide additional protection; they
are not, however, asubstitute for seat belts.
All vehicle occupants must fasten their seat
belts regardless of whether your vehicle is
equipped with air bags or not.
It is important for your safety and that of your
passenger to have deployed air bags replaced
and to have any malfunctioning air bags
repaired. This will help to make sure the air
bags continue to perform their protective 44
Occupant safetySafety

function for the vehicle occupants in the
event of acrash.
i After an airb ag has been deployed, have
th ev ehicle towed to th eneares tqualified
specialist workshop, eve nifyour vehicle is
ready to drive.
Front air bags Driver'
sair bag 001Adeploys in front of the
steerin gwheel; front-passenger front air
bag 0010deploys in front of and above the glove
box.
The front air bags increase protection for the
driver's and front passenger's head and
chest.
They are deployed:
R at the start of an accident with ahigh rate
of vehicle acceleration or deceleration in a
longitudinal direction
R if the system determines that air bag
deployment can offer additional protection
to that provided by the seat belt
R independently of other air bags in the
vehicle
The release time of the front air bags is
dependent upon the use of the seat belt.
If the vehicle rolls over, the front air bags are
generally not deployed.
Your vehicle has adaptive, two-stage front air
bags. The air bag control unit evaluates
vehicle deceleration or acceleration in the
event of acollision. In the first deployment
stage, the front air bag is filled with part of the
total available propellant gas, thereby reducing the risk of injury. If the air bag
control unit recognizes within
afew
milliseconds that the vehicle is being braked
or accelerated faster than originally
predicted, the front air bag is filled with the
maximum amount of propellant gas available.
The deployment of the front-passenger front
air bag is also influenced by the weight
category of the front passenger, which is
determined by the Occupant Classification
System (OCS) (Y page 47).
The lighter the passenger-side occupant ,the
higher the vehicle deceleration rate required
(predicted at the start of the impact) for
second stage inflation of the front-passenger
front air bag. In the second stage, the front
air bags are inflated with the maximum
amount of propellant gas available.
The front air bags are not deployed in
situations where alow impact severity is
predicted. You will then be protected by the
fastened seat belt.
The front-passenger front air bag will only
deploy if:
R the system, based on the OCS weight
sensor readings, detect sthat the front-
passenger seat is occupied
R the PASSENGER air bag OFF indicator lamp
on the center console is not lit
(Y page 47)
R the air bag control unit predicts ahigh
impact severity
Driver's knee bag Occupant safety
45Safety Z

Driver's knee bag
001Adeploy sunder the
steering column. Th edriver's knee ba gis
always deployed along with the driver's front
ai rb ag. The driver' skneeb ag is designe dto
operate together wit hthe fron tair bags in
frontal impacts if certain thresholds are
exceeded. The driver's knee bag operates
best in conjunction with correctly positioned
and fastened seat belts.
Driver' skneeb ag001A increases the driver's
protection against:
R knee injuries
R thig hinjuries
R lower leg injuries
Side impact air bags G
WARNING
Usin gunsuitable seat covers could restric tor
even preven tdeployment of the air bags
integrated into the seats. Consequently, the
air bags cannot protec tvehicle occupant sas
they are designed to do. In addition, the
function of the air bag deactivation system
could be restricted. This poses an increased
risk of injury or even fatal injury.
You should only use seat cover sthat have
been approved for the respective seat by
Mercedes-Benz. G
WARNING
Sensors to control the air bags are located in
the doors. Modification sorwork not
performed correctly to the doors or door
paneling, as well as damaged doors, can lead
to the function of the sensor sbeing impaired.
The air bags might therefore not function
properly any more. Consequently, the air bags
cannot protec tvehicle occupant sasthey are
designed to do. There is an increased risk of
injury.
Never modify the doors or parts of the doors.
Always have work on the doors or door
paneling carried out at aqualified specialist
workshop. You should only use seat cover
sthat have
been approved for your vehicle by Mercedes-
Benz .The seat covers must have aspecial
tear seam for side impact air bags. Otherwise,
the side impact air bags cannot deploy
correctly and therefore cannot provide the
intended protection in the event of an
accident. Front side impact air bags
001Aand rear side
impact air bags 0010deploy next to the outer
seat cushions.
When deployed, the side impact air bags offer
additional protection of the thorax for
occupants on the front seats as well as also
of the pelvis for the vehicle occupants on the
side of the vehicle on which the impact
occurs. However, they do not protect the:
R head
R neck
R arms
The side impact air bags are deployed:
R on the side on which an impact occurs
R at the start of an accident with ahigh rate
of lateral vehicle deceleration or
acceleration, e.g. in aside impact
R independently of the use of the seat belt
R independently of the front air bags
R independently of the ETDs
If the vehicle rolls over ,the side impac tair
bags are generally not deployed. Side impact
air bags are deployed if the system detects
high vehicle deceleration or acceleration in a
lateral direction and determines that side
impac tair bag deploymen tcan offer 46
Occupant safetySafety

additional protection to that provide
dbythe
seat belt.
Sid eimpac tair bags will not deploy in side
impacts which do not exceed the system's
prese tdeployment thresholds for lateral
acceleration/deceleration .You will then be
protected by the fastened seat belt.
The side impact air bag on the front-
passenger side is not deployed in the
following situations:
R OCS has detected that the front-passenger
seat is unoccupied.
R the front-passenger seat belt is not
fastened.
The side impact air bag on the front-
passenger side will deploy if the front-
passenger seat belt is fastened, regardless of
whether the front-passenger seat is occupied
or not.
Window curtain air bags Window curtain air bags
001Aenhanc ethe level
of protection for the head, but not chest or
arms, of the vehicle occupant sonthe side of
the vehicle on which the impact occurs.
Window curtain air bags 001Aare integrated
into the side of the roof frame and deployed
in the area from the A-pillar to the C-pillar.
Window curtain air bags are deployed:
R at the start of an accident with ahigh rate
of lateral vehicle deceleration or
acceleration, e.g. in aside impact
R on the side on which an impact occurs R
on th edriver' ssidea nd passenger side, in
the event of avehicl erollover and if the
system determine sthat ai rbag deployment
can offer th evehicle occupants additional
protection to that provide dbytheseat belt
R independently of th euse of th eseat belt
R regardless of whether th efront-pa ssenger
seat is occupied
R independently of th efront air bags
Windo wcurtain air bags 001Awill not deploy in
the even tofimpacts which do not exceed the
system's prese tdeployment thresholds for
vehicle acceleration/deceleration .You will
then be protected by the fastened seat belt. Occupant Classification System
(OCS)
Method of operation G
WARNING
If the 000E0013 indicator lamp illuminates
when an adult or someone larger than asmall
individual is in the front-passenger seat, have
the front passenger reposition himself or
herself in the seat until the 000E0013
indicator lamp goes out.
In the event of acollision, the air bag control
unit will not allow front-passenger front air
bag deployment when the OCS has classified
the front-passenger seat occupant as
weighing as much as or less than atypical 12-
month-old child in astandard child restraint
or if the front-passenger seat is classified as
being empty.
When the OCS senses that the front-
passenger seat occupant is classified as
being up to or less than the weight of atypical
12-month-old child in astandard child
restraint ,the 000E0013 indicator lamp will
illuminate when the engine is started and
remain illuminated, indicating that the front-
passenger front air bag is deactivated.
When the OCS senses that the front-
passenger seat is classified as being empty, Occupant safety
47Safety
Z

the
000E0013 indicator lamp will illuminate
when the engine is started and remain
illuminated, indicating tha tthe front-
passenger front air bag is deactivated.
When the OCS senses that the front-
passenger seat occupant is classified as
being heavier than the weight of atypical 12-
month-old child seated in astandar dchild
restraint or as being asmall individual (such
as ayoung teenager or asmall adult), the
000E0013 indicator lamp willi lluminate for
approximatel y6seconds when the engine is
started and then ,depending on occupant
weight sensor readings from the front-
passenger seat, remain illuminated or go out.
With the 000E0013 indicator lamp
illuminated, the front-passenger fron tair bag
is deactivated. With the 000E0013indicator
lamp out, the front-passenge rfront air bag is
activated.
When the OCS senses that the front-
passenger seat occupant is classifie dasan
adult or someone larger than asmall
individual, the 000E0013indicator lamp will
illuminate for approximatel y6seconds when
the engine is started and then go out,
indicating that the front-passenger fron tair
bag is activated.
If the 000E0013 indicator lamp is illuminated,
the front-passenger fron tair bag is
deactivated and will not be deployed.
If the 000E0013 indicator lamp is not
illuminated, the front-passenger fron tair bag
is activate dand will be deployed:
R in the even tofcertain frontal impacts
R if impact exceeds apreset deployment
threshold
R independently of the side impact air bags
If the front-passenge rfront air bag is
deployed, the rate of inflation will be
influenced by:
R the rate of relevant vehicle deceleratio nas
assessed by th eair bag control unit
R thef ront pa ssenger's weigh tcategor yas
identified by OCS G
WARNING
Accordin gtoacciden tstatistics, childre nare
safe rwhen properly restrained on the rear
seats than on the front-passenger seat. Thus,
we strongly recommendt hat children be
placed in the rear seats whenever possible.
Regardless of seating position, children 12
years old and under must be seated and
properly secured in an appropriate infant
restraint,t oddler restraint,orb ooster seat
recommended for the size and weight of the
child.
The infant or child restraint must be properly
secured with the vehicle's seat belt, the seat
belt and Top Tether strap, or lower anchors
and Top Tether strap, fully in accordance with
the child seat manufacturer's instructions.
Occupants, especially children, should always
sit as upright as possible, wear the seat belt
properly and use an appropriately sized infant
restraint,t oddler restraint,orb ooster seat
recommended for the size and weight of the
child.
Children can be killed or seriously injured by
an inflating air bag. Note the following
important information when circumstances
require you to place achild in the front-
passenger seat:
R Your vehicle is equipped with air bag
technology designed to deactivate the
front-passenger front air bag in your vehicle
when the system senses the weight of a
typical 12-month-old child or less along
with the weight of astandard appropriate
child restraint on the front-passenger seat.
R Ac hild in arear-facing child restraint on the
front-passenger seat will be seriously
injured or even killed if the front-passenger
front air bag inflates in acollision which
could occur under some circumstances,
even with the air bag technology installed
in your vehicle. The only means to eliminate
this risk completely is never to place achild
in ar ear-facing child restraint in the front-
passenger seat. We therefore strongly
recommendt hat you always place achild 48
Occupant safetySafety