2014 MERCEDES-BENZ CLS sensor

If the SmartKey is removed from the ignition
lock or is in position0,PASSENGER AIR BAG
OFF indicator lampdoes not light up.
The Occupant Classification System (OCS)
categorizesthe occupant on the front-
passengerseat usingaweight sensor.The
front-passenger front air bag is deactivated
automatically for certain weight categories.
The PASSENGER AIR BAG OFF indicator lamp
shows you the current status.
Occupant Classification System (OCS)
categories the occupant on the front-
passenger seat usingaweight sensor.
The front-passenger front air bag and the
front-passenger knee bag are deactivated
automatically for certain weight categories.
The PASSENGER AIR BAG OFF indicator lamp
shows you the current status.
If the PASSENGER AIR BAG OFF indicator
lamp lights up, the front-passenger front air
bag and the front-passenger knee bag are
disabled.
The system does not deactivate:
Rthe side impact air bag
Rthe pelvis air bag
Rthe window curtain air bag
Rthe Emergency Tensioning Devices
To be classified correctly, the front passenger
must sit:
Rwith the seat belt fastened correctly
Rinaposition that is as upright as possible
with their back against the seat backrest
Rwith their feet on the floor
The OCS weight sensor reading is affected if
the occupant's weight is transferred, e.g. by
leaning on the armrest.
If the front-passenger seat, the seat cover or
the seat cushion are damaged, have the
necessary repair work carried out at a
qualified specialist workshop.
For safety reasons, Mercedes-Benz
recommends that you only use seat
accessories that have been approved by
Mercedes-Benz.
Both the driver and the front passenger
should always observe the PASSENGER AIR
BAG OFF indicator lamp as an indication of
whether or not the front passenger is
positioned correctly. Observe also the air bag
displaymessages that can be displayed in the
instrumentcluster (Ypage 244).
If the driver's air bag deploys, this does not
mean that the front-passenger front air bag
will also deploy.
The OCS may have detected that the seat:
Ris empty or occupied by the weight of a
typical child up to twelve months old,
seated inachild restraint system
Ris occupied byasmall individual, such as a
young teenager orasmall adult
Ris occupied byachild inachild restraint
system whose weight is greater than that
ofatypical twelve monthold child.
These are examples of when the OCS
deactivates the front-passenger front air bag
and front-passenger knee bag. Deactivation
takes place although the collision fulfills the
criteria for deploying the driver's air bag.
For further information,see "Air bag display
messages" (Ypage 244).
System self-test
GWARNING
If theindicator lamp does not
illuminate, the system is not functioning. You
must contactanauthorized Mercedes-Benz
50Occupant safety
Safety

Rif, on vehicles with DISTRONIC PLUS,the
radar sensor system detectsanimminent
dangerofcollision in certain situations.
Rin critical driving situations, e.g. when
physical limits are exceeded and the
vehicle understeers or oversteers severely.
PRE-SAFE®takes the following measures
depending on the hazardous situation
detected:
Rthe front seat belts are pre-tensioned.
Rthe front-passenger seat is adjusted if it is
in an unfavorable position.
Rvehicles withamulticontour seat or active
multicontour seat: the air pressure in the
side bolsters of the seat cushion and
backrest is increased.
Rif the vehicle skids, the sliding sunroof and
the side windows are closed so that only a
small gap remains.
If the hazardous situation passes without
resulting in an accident,PRE-SAFE®slackens
the belt pre-tensioning. The air pressure in
the side bolsters on the multicontour seat/
active multicontour seat is reduced again. All
settings made by PRE-SAFE®can then be
reversed.
If the seat belts are not released:
XWhen the vehicle is stationary, move the
backrest or seat back slightly.
The seat belt pre-tensioningisreduced and
the lockingmechanism is released.
Information about seat belt adjustment, a
conveniencefunction integrated into PRE-
SAFE®,can be found in the "Seat belt
adjustment" section (Ypage 57).
Seat belts
Important safety notes
GWARNING
The seat belt does not offer the intended level
of protection if the backrest is not in the
upright position. When braking or in the event
of an accident,you could slide underneath the
seat belt and sustain abdomen or neck
injuries, for example. This poses an increased
risk of injury or even fatal injury.
Adjust the seat properly before beginning
your journey. Always make sure that the seat
is in the upright position.
GWARNING
Seat belts cannot protect as intended, if:
Rthey are damaged, extremely dirty,
bleached or dyed
Rthe seat belt buckle is damaged or
extremely dirty
Rthe Emergency TensioningDevices or the
belt anchorage has been modified.
Damage caused to seat belts in an accident
may not be visible, e.g. by splinters of glass.
Modified or damaged seat belts can tear or
fail, for example in the event of an accident.
Modified Emergency TensioningDevices may
be deployed unintentionally or fail to be
deployed when required. There is an
increased risk of injury, possibly even fatal.
Never modify seat belts, Emergency
TensioningDevices, seat belt anchorages and
inertia reels. Ensure that seat belts are not
damaged or worn and are clean.
Only use seat belts that have been approved
for your vehicle by Mercedes-Benz.
The use of seat belts and infant and child
restraint systems is required by law in:
Rall 50 states
Rthe U.S. territories
Rthe District of Columbia
Rall Canadianprovinces
Even where this is not required by law,all
vehicleoccupants should correctly fasten
their seat belts before starting the journey.
iSee "Children in the vehicle"
(Ypage60) for further information on
infants and children traveling in the vehicle
as wellasonchild restraint systems.
Occupant safety55
Safety
Z

ABS works fromaspeedof about5mph
(8 km/h)upwards,regardless of road-surface
conditions.ABS works on slippery surfaces,
evenifyou only brake gently.
The yellowABS warning lamp in the
instrument cluster lights up when the ignition
is switched on. It goes out when the engine is
running.
Braking
XIf ABS intervenes:continue to depress the
brake pedal vigorously until the braking
situation is over.
XTo makeafull brake application:
depress the brake pedal with full force.
If ABS intervenes when braking, you will feel
apulsing in the brake pedal.
The pulsating brake pedal can be an
indication of hazardous road conditions, and
functions asareminder to take extracare
while driving.
BAS (Brake Assist System)
iObserve the "Important safety notes"
section (Ypage 66).
GWARNING
If BAS is malfunctioning, the braking distance
in an emergencybraking situation is
increased. There isarisk of an accident.
In an emergencybraking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
BAS operates in emergencybraking
situations. If you depress the brake pedal
quickly, BAS automatically boosts the braking
force, thus shortening the stopping distance.
The brakes will function as usual once you
release the brake pedal. BAS is deactivated.
BAS PLUS (Brake Assist System
PLUS)
General information
iObserve the "Important safety notes"
section (Ypage 66).
BAS PLUS is only available in vehicles
equipped with DISTRONIC PLUS.
For BAS PLUS to assist you when driving, the
radar sensor system must be:
Ractivated (Ypage 232)
Roperational
With the help of the radar sensor system, BAS
PLUS can detect obstacles that are in the
path of your vehicle for an extended period of
time.
If the radar sensor system is malfunctioning,
BAS PLUS will not be available. The brake
system is still available with complete brake
boosting effect and BAS.
BAS PLUS provides braking assistance in
hazardous situations at speeds greater than
4mph (7 km/h).
At speeds of up to approximately 40 mph
(70 km/h),BAS PLUS can also react to
stationary objects. Examples of stationary
objectsare stopped or parked vehicles.
Important safety notes
GWARNING
BAS PLUS cannot alwaysclearly identify
objectsand complex traffic situations. BAS
PLUS cannot intervene in these cases. There
isarisk of an accident.
Always pay careful attention to the traffic
situation and be ready to brake.
GWARNING
BAS PLUS does not react:
Rto people or animals
Rto oncoming vehicles
Rto crossingtraffic
Rwhen cornering
Driving safety systems67
Safety
Z

Asaresult, BAS PLUS may not intervene in all
critical situations. There isarisk of an
accident.
Always pay careful attention to the traffic
situation and be ready to brake.
In particular, the detection of obstacles can
be impaired if there is:
Rdirt on the sensorsoranythingelse
covering the sensors
Rsnow or heavy rain
Rinterference by other radar sources
Rthere are strong radar reflections, for
example in parking garages
Ranarrow vehicle travelinginfront, e.g. a
motorbike
Ravehicle travelinginfrontonadifferent line
relative to the center of your vehicle
Following damage to the frontend of the
vehicle, have the configurationand operation
of the radarsensorschecked ataqualified
specialist workshop. This also applies to
collisions at low speeds where thereisno
visible damage to the frontofthe vehicle.
Braking assistance
To preventacollision with the vehicle in front,
BAS PLUS calculates the brake force
necessary if:
Ryou approach an obstacle, and
RBAS PLUS has detectedarisk of collision
When driving ataspeed under 20 mph
(30 km/h):ifyou depress the brake pedal,
BAS PLUS is activated. The increase in brake
pressure will be carried out at the last
possible moment.
When driving ataspeed greater than
20 mph (30 km/h):ifyou depress the brake
pedal sharply, BAS PLUS automatically raises
the brake pressure toavalue adapted to the
traffic situation.
If BAS PLUS demands particularly high
braking force, preventative passenger
protection measures (PRE-SAFE®)are
activated simultaneously.
XKeep the brake pedal depressed until the
emergencybraking situation is over.
ABS preventsthe wheels from locking.
BAS PLUS is deactivated and the brakes
function as usual if:
Ryou release the brake pedal
Rthere is no longerarisk of collision
Rno obstacle is detected in front of your
vehicle
ESP®(Electronic Stability Program)
Important safety notes
iObserve the "Important safety notes"
section (Ypage 66).
GWARNING
If ESP®is malfunctioning, ESP®is unable to
stabilize the vehicle. Additionally, further
driving safety systems are deactivated. This
increases the risk of skidding and an accident.
Drive on carefully. Have ESP®checked at a
qualified specialist workshop.
!Vehicles with 4MATIC: switch off the
ignition when the parking brake is being
tested onabrake dynamometer.
Application of the brakes by ESP®may
otherwise destroy the brake system.
Vehicles without 4MATIC: observe the notes
on ESP®(Ypage 330) when towing the
vehicle witharaised rear axle.
ESP®is deactivated if the warning lamp
in the instrument cluster lights up
continuously when the engine is running.
If thewarning lamp and the
warning lamp are lit continuously, ESP®is not
available due toamalfunction.
Observe the information on warning lamps
(Ypage 269) and display messages which
may be shown in the instrument cluster
(Ypage 238).
68Driving safety systems
Safety

ADAPTIVE BRAKE
ADAPTIVEBRAKE enhancesbraking safety
and offers increased braking comfort.In
addition to thebraking function,ADAPTIVE
BRAKE also has theHOLDfunction
(Ypage 186) and hill start assist
(Ypage 150).
PRE-SAFE®Brake
Generalinformation
iObservethe"Importantsafetynotes"
section(Ypage 66).
PRE-SAFE®Brakeisonly available in vehicles
with DISTRONIC PLUS.
If PRE-SAFE®Brakeistoaid you, the radar
sensorsystem mustbe:
Ractivated (Ypage 232)
Roperational
With the help of the radar sensor system,
PRE-SAFE®Brakecan detectobstacles that
are in frontofyour vehicle for an extended
period of time.
PRE-SAFE®Brakecan help you to minimize
the risk ofacollision withavehicle ahead or
reduce the effects of suchacollision. If PRE-
SAFE®Brakehas detectedarisk of collision,
you will be warned visually and acoustically
as well as by automatic braking. PRE-SAFE®
Brakecannot preventacollision withoutyour
intervention.
At speeds of up to approximately 40 mph
(70 km/h)PRE-SAFE®Brake can also detect
stationary objects. Examples of stationary
objectsare stopped or parked vehicles.
Important safety notes
GWARNING
PRE-SAFE®Brake will initially brake your
vehicle byapartial application of the brakes
ifadanger of collision is detected. There may
beacollision unless you also brake.
Automatic emergencybraking cannot prevent
acollision. There isarisk of an accident.
Always apply the brakes yourself and try to
take evasive action.
GWARNING
PRE-SAFE®Brake cannot alwaysclearly
identify objects and complextraffic
conditions.
In these cases, PRE-SAFE®Brake may:
Rgive an unnecessary warning and then
brake the vehicle
Rnot giveawarning or intervene
There isarisk of an accident.
Always pay particular attention to the traffic
situation and be readytobrake, especially if
PRE-SAFE®Brake warns you.Terminate the
intervention inanon-critical driving situation.
In particular, the detection of obstacles can
be impaired if there is:
Rdirt on the sensors or anything else
covering the sensors
Rsnow or heavy rain
Rinterference by other radarsources
Rthere are strongradar reflections, for
example in parking garages
Ranarrow vehicle traveling in front,e.g. a
motorbike
Ravehicle traveling in front onadifferent line
relative to the center of your vehicle
GWARNING
PRE-SAFE®Brake does not react:
Rto people or animals
Rto oncoming vehicles
Rto crossingtraffic
Rwhen cornering
Asaresult, PRE-SAFE®Brake may neither
give warnings nor intervene in all critical
situations. There isarisk of an accident.
Always pay careful attention to the traffic
situation and be ready to brake.
72Driving safety systems
Safety

In order to maintain the appropriatedistance
to the vehicle in front and thus prevent a
collision, you must apply the brakes yourself.
Due to the nature of the system, particularly
complicated driving conditionsmay cause
unnecessarywarningsortheunnecessary
intervention of PRE-SAFE®Brake.
Followingdamagetothe front end of the
vehicle, have the configurationand operation
of the radarsensorschecked ataqualified
specialist workshop. This also applies to
collisions at low speeds where thereisno
visible damage to the frontofthe vehicle.
Function
XTo activate/deactivate:activate or
deactivate PRE-SAFE®Brake in the on-
board computer (Ypage 228).
If the PRE-SAFE®Brake is not activated, the

symbol appears in the multifunction
display.
If you approachavehicle in front very quickly,
this function warns you fromaspeed of
approximately4mph (7 km/h). An
intermittent warning tone sounds and the
distance warning signal lamp in the
instrumentcluster lightsup.
XBrake immediately to defuse the situation.
or
XTake evasiveaction provided it is safe to do
so.
Fromaspeed of approximately4mph
(7 km/h), if the driver and frontpassenger
have fastened their seat belts, PRE-SAFE®
Brakecan brake the vehicle automatically at
speeds up to approximately 124 mph
(200 km/h).
You can preventthe intervention of the PRE-
SAFE®Brakeatany time by:
Rdepressingthe accelerator pedal further.
Ractivating kickdown.
Rreleasing the brake pedal.
The brakingaction of PRE-SAFE®Brakeis
ended automatically if:
Ryou maneuver to avoid the obstacle.
Rthereisnolonger any danger ofarear-end
collision.
Rthereisnolonger an obstacle detected in
frontofyour vehicle.
If you approach an obstacle and PRE-SAFE®
Brakedetectsarisk ofacollision, the system
will alert you both visually and acoustically. If
you do not brake or takeevasive action,the
system will warn you by automatically braking
the vehicle gently. If thereisanincreased risk
of collision, preventative passenger
protection measures (PRE-SAFE®)are
activated (Ypage 54). Ifarisk of collision
remains at speeds of over 20 mph
(30 km/h) and you do not brake, takeevasive
action or significantly accelerate, automatic
brakingmay be performed up to and including
emergency braking. Automatic emergency
brakingisnot performed until immediately
prior to an accidentthat can no longer be
avoided.
Theftdeterrent locking system
Immobilizer
The immobilizer prevents your vehicle from
being started without the correct SmartKey.
XTo activate with the SmartKey:remove
the SmartKey from the ignition lock.
XTo activate with KEYLESS-GO:switchthe
ignition off and open the driver'sdoor.
XTo deactivate:switchonthe ignition.
When leaving the vehicle, always takethe
SmartKey with you and lock the vehicle.
Anyone can start the engineifavalid
SmartKey has been left inside the vehicle.
iThe immobilizer is always deactivated
when you start the engine.
In the event that the enginecannot be
started when the starter battery is fully
charged, the immobilizer may be faulty.
Theft deterrent locking system73
Safety
Z

If you do not open the vehicle within
approximately 40 seconds of unlocking:
Rthe vehicle is locked again.
Rthe theft deterrent locking system is
armed again.
XTo lockcentrally:pressthebutton.
The SmartKey centrally locks/unlocks:
Rthedoors
Rthetrunk lid
Rthefuel filler flap
The turnsignals flash oncewhen unlocking
and three times when locking.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer (Ypage 232).
When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer (Ypage 231).
KEYLESS-GO
General notes
Bear in mind that the engine can be started
by any of the vehicle occupants if there is a
KEYLESS-GO key in the vehicle.
Locking/unlocking centrally
You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you only need carry
the SmartKey with you. You can combine the
functions of KEYLESS-GO with those of a
conventional SmartKey. Unlock the vehicle
by using KEYLESS-GO, for instance, and lock
it using thebutton on the SmartKey.
When locking or unlocking with KEYLESS-GO,
the distance between the SmartKey and the
corresponding door handle must not be
greater than3ft(1m).
KEYLESS-GO checkswhetheravalid
SmartKey is in the vehicle by periodically
establishingaradio connection between the
vehicle and the SmartKey. This happens:
Rwhen the external door handles are
touched
Rwhen startingthe engine
Rwhile the vehicle is in motion
XTo unlock the vehicle:touch the inner
surface of the door handle.
XTo lock the vehicle:touch sensor
surface.
XConvenience closing feature:touch
recessed sensor surfacefor an
extended period.
XTo unlock the trunk lid:pull the handle on
the trunk lid.
Further information on the convenience
closing feature (Ypage 90).
Changing the settings of the locking
system
You can change the settings of the locking
system. This means that only the driver's door
and the fuel filler flap are unlocked when the
vehicle is unlocked. This is useful if you
frequently travel on your own.
XTo change the setting:press and hold
down theandbuttons on the
SmartKey simultaneously for
SmartKey77
Opening and closing
Z

approximately six seconds until thebattery
check lamp flashes twice (Ypage 79).
iIf thesettingofthelockingsystem is
changed within thesignal range of the
vehicle,pressingtheorbutton:
Rlocks or
Runlocksthevehicle
The SmartKey nowfunctionsasfollows:
XTo unlock thedriver's door:pressthe
buttononce.
XTo unlock centrally:pressthe
buttontwice.
XTo lock centrally:pressthebutton.
The KEYLESS-GO function is changed as
follows:
XTo unlock thedriver's door:touch the
inner surface of thedoor handle on the
driver'sdoor.
XTo unlock centrally:touch theinner
surface of thedoor handle on thefront-
passenger door or therear door.
XTo lock centrally:touch theoutersensor
surface on one of the door handles.
XTo restorethe factorysettings:press
and hold down theandbuttons
simultaneously for approximately six
seconds until the batterychecklamp
flashes twice (Ypage 79).
Mechanicalkey
General notes
If thevehicle can no longer be lockedor
unlocked withtheSmartKey, use the
mechanical key.
If you use themechanical keytounlock and
open thedriver'sdoor or thetrunk lid, the
anti-theftalarm system will be triggered
(Ypage 74).
There are several ways to turnoff the alarm:
XTo turn the alarm off with the
SmartKey:press theorbutton
on the SmartKey.
or
XInsert the SmartKey into the ignition lock.
or
XTo deactivate the alarm with KEYLESS-
GO:press the Start/Stop button in the
ignition lock. The SmartKey must be in the
vehicle.
or
XLock or unlock the vehicle using KEYLESS-
GO. The SmartKey must be outside the
vehicle.
If you unlock the vehicle using the mechanical
key, the fuel filler flapwill not be unlocked
automatically.
XTo unlock thefuel filler flap:insert the
SmartKey intothe ignition lock.
Removing themechanical key
Release catch
Mechanical key
XPush release catchin the direction of
the arrow and at the same timeremove
mechanical keyfromthe SmartKey.
78SmartKey
Opening and closing