light MERCEDES-BENZ CLS 2017 Owner's Manual

Function PRE-SAF E ®
intervenes:R
in emergenc y braking situations, e.g. when
BA S is activatedR
in critical driving situations, e.g. when physi-
cal limits are exceeded and th e vehicl e under-
steer s or oversteer s severelyR
on vehicles wit h th e Drivin g Assistanc e pack-
age: if BA S PLU S intervenes powerfully or th e
radar sensor system detect s an imminent
danger of collision in certai n situation s
PRE-SAF E ®
takes th e followin g measures
depending on th e hazardous situation detected:R
th e fron t seat belt s are pre-tensioned.R
th e front-passenger seat is adjusted if it is in
an unfavorable position .R
if th e vehicl e skids, th e side windows and th e
sliding sunroo f are closed.R
vehicles wit h a multicontour seat or active
multicontour seat : th e air pressur e in th e side
bolsters of th e backrest is increased.
If th e hazardous situation passes without result -
ing in an accident, PRE-SAF E ®
slackens th e belt
pre-tensioning . On vehicles wit h multicontour
seat s or active multicontour seats, th e air pres-
sure in th e side bolsters is reduce d again . All
setting s made by PRE-SAF E ®
can then be
reversed.
If th e seat belt pre-tensioning is no t reduced:X
Mov e th e seat backrest or seat bac k slightly
when th e ve hicl e i s stationary.
The seat belt pre-tensioning is reduce d and
th e lockin g mechanism is released.
The seat-belt adjustmen t is an integral part of
th e PRE-SAF E ®
convenience function . Informa-
tion about th e convenience function can be
foun d under "Belt adjustment" ( Y
page 45).
PRE-SAFE ®
PLUS (anticipatory occu-
pant protection system PLUS)
Introduction
PRE-SAF E ®
PLU S is only available in vehicles
wit h th e Drivin g Assistanc e package.
Usin g th e radar sensor system, PRE-SAF E ®
PLU S is able to detect that a head-on or rear-end
collision is imminent . In certai n hazardous sit - uations, PRE-SAF E ®
PLU S takes pre-emptive
measures to protect th e vehicl e occupants.
Important safety notes The intervention of PRE-SAF E ®
PLU S canno t
preven t an imminent collision .
The driver is no t warned about th e intervention
of PRE-SAF E ®
PLUS.
PRE-SAF E ®
PLU S does no t interven e if th e vehi-
cle is backin g up.
When driving , or when parking or exiting a park -
ing spac e wit h assistanc e from Active Parking
Assist , PRE-SAF E ®
PLU S will no t apply th e
brakes.
Function PRE-SAF E ®
PLU S intervenes in certai n situa-
tion s if th e radar sensor system detect s an
imminent head-on or rear-end collision .
PRE-SAF E ®
PLU S takes th e followin g measures
depending on th e hazardous situation detected: R
if th e radar sensor system detect s that a
head-on collision is imminent , th e seat belt s
are pre-tensioned. R
if th e radar sensor system detect s that a rear -
en d collision is imminent :-
th e brak e pressur e is increased if th e driver
applie s th e brakes when th e vehicl e is sta-
tionary. -
th e seat belt s are pre-tensioned.
The PRE-SAF E ®
PLU S braking application is can -
celed: R
if th e accelerato r pedal is depressed when a
gear is engage d R
if th e ris k of a collision passes or is no longer
detected R
if DISTRONI C PLU S indicates an intention to
pull away
If th e hazardous situation passes without result -
ing in an accident, th e original setting s are
restored .Occupant safety 57
Safety Z

Aut oma tic measures after an acci-
dent Immediately after an accident, th e followin g
measures are implemented, depending on th e
typ e and severity of th e impact :R
th e hazard warning lamp s are activatedR
th e emergenc y lighting is activatedR
th e vehicl e door s are unlocke dR
th e fron t side windows are loweredR
vehicles wit h a memory function : th e electri-
call y adjustable steering whee l is raisedR
th e engin e is switched off and th e fuel supply
is cut off R
vehicles wit h mbrace : automatic emergenc y
call
Children in the vehicle
Import ant safety notesAcciden t statistics sho w that children secured
in th e rear seat s are safer than children secured
in th e front-passenger seat . Fo r this reason ,
Mercedes-Benz strongly advises that you instal l
a child restrain t system on a rear seat . Children
are generally bette r protected there .
If a child younger than twelve years old and
under 5 ft (1.5 0 m) in height is traveling in the
vehicle: R
always secure the child in a child restraint
system suitable for Mercedes-Benz vehicles.
The child restraint system must be appropri-
ate to the age, weight and size of the child R
be sure to observe the instructions and safety
notes in this section in addition to the child
restraint system manufacturer's installation
instructions R
be sure to observe the instructions and safety
notes on the "Occupant classification system
(OCS)" ( Y
page 49)
G WARNING
If you leave children unsupervised in the vehi-
cle, they could set it in motion by, for example: R
release the parking brake. R
shift the automatic transmission out of the
parking position P .R
start the engine. In addition, they may operate vehicle equip-
ment and become trapped. There is a risk of
an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
G WARNING
If persons, particularly children are subjected
to prolonged exposure to extreme heat or
cold, there is a risk of injury, possibly even
fatal. Never leave children unattended in the
vehicle.
G WARNING
If the child restraint system is subjected to
direct sunlight, parts may get very hot. Chil-
dren may burn themselves on these parts,
particularly on the metal parts of the child
restraint system. There is a risk of injury.
If you leave the vehicle, taking the child with
you, always ensure that the child restraint
system is not exposed to direct sunlight. Pro-
tect it with a blanket, for example. If the child
restraint system has been exposed to direct
sunlight, let it cool down before securing the
child in it. Never leave children unattended in
the vehicle.
Always ensure that all vehicle occupants have
their seat belts fastened correctly and are sitting
properly. Particular attention must be paid to
children.
Observe the safety notes on the seat belt
( Y
page 43) and the notes on correct use of seat
belts ( Y
page 44).
A booster seat may be necessary to achieve
proper seat belt positioning for children over
41 lbs (18 kg) until they reach a height where a
three-point seat belt can be properly fastened
without a booster seat.
Special seat belt retractor
G WARNING
If the seat belt is released while driving, the
child restraint system will no longer be58
Children in the vehicle
Safety

G WARNING
If the child restraint system is subjected to
direct sunlight, parts may get very hot. Chil-
dren may burn themselves on these parts,
particularly on the metal parts of the child
restraint system. There is a risk of injury.
If you leave the vehicle, taking the child with
you, always ensure that the child restraint
system is not exposed to direct sunlight. Pro-
tect it with a blanket, for example. If the child
restraint system has been exposed to direct
sunlight, let it cool down before securing the
child in it. Never leave children unattended in
the vehicle.
Child-proof locks for the rear doors
You secure each door individually with the child-
proof locks on the rear doors. A door secured
with a child-proof lock cannot be opened from
inside the vehicle. When the vehicle is unlocked,
the door can be opened from the outside. X
To activate: press the child-proof lock lever
up in the direction of arrow C .X
Make sure that the child-proof locks are work-
ing properly. X
To deactivate: press the child-proof lock
lever down in the direction of arrow D . Override feature for the rear side win-
dows X
To activate/deactivate: press button D .
If indicator lamp C is lit, operation of the rear
side windows is disabled. Operation is only
possible using the switches in the driver's
door. If indicator lamp C is off, operation is
possible using the switches in the rear com-
partment.
Pets in the vehicle
G WARNING
If you leave animals unattended or unsecured
in the vehicle, they could press buttons or
switches, for example.
As a result, they could: R
activate vehicle equipment and become
trapped, for example R
activate or deactivate systems, thereby
endangering other road users
Unsecured animals could also be flung around
the vehicle in the event of an accident or sud-
den steering or braking, thereby injuring vehi-
cle occupants. There is a risk of an accident
and injury.
Never leave animals unattended in the vehi-
cle. Always secure animals properly during
the journey, e.g. use a suitable animal trans-
port box.Pets in the vehicle 63
Safety Z

Drivin g safet y systems
Overview of drivin g safet y systemsIn this section , you will fin d information about
th e followin g drivin g safet y systems :R
AB S ( A n ti-loc k B rakin g S ystem)
( Y
page 64)R
BA S ( B rak e A ssist S ystem) ( Y
page 65)R
BA S PLU S ( B rake A s sis t S ystem PLUS) wit h
Cross-Traffic Assis t ( Y
page 65)R
COLLISION PREVENTION ASSIST PLU S
( Y
page 67 )R
ES P ®
( E lectronic S t ability P r ogram)
( Y
page 69)R
EB D ( E lectroni c B rak e forc e D istribution )
( Y
page 72 )R
ADAPTIV E BRAKE ( Y
page 72 )R
PRE-SAF E ®
Brak e ( Y
page 72 )
Important safet y notesIf you fail to adapt your drivin g style or if you are
inattentive , th e drivin g safet y systems can nei-
ther reduce th e ris k of an acciden t no r override
th e laws of physics. Driving safet y systems are
merely aids designed to assist driving. You are
responsible fo r maintainin g th e distanc e to th e
vehicle in front, fo r vehicle speed, fo r braking in
goo d time, and fo r stayin g in lane. Always adapt
your drivin g style to suit th e prevailin g road and
weather condition s and maintain a saf e distanc e
from th e vehicle in front. Drive carefully.
The drivin g safet y systems described only wor k
as effectively as possible when there is ade-
quat e contact between th e tires and th e road
surface. Pay particular attention to th e informa-
tion regardin g tires , recommended minimum
tire tread depths etc. in th e "Wheels and tires "
section ( Y
page 292).
In wintr y drivin g conditions, always use winte r
tires (M+ S tires )a nd if necessary, snow chains.
Only in this way will the driving safety systems
described in this section work as effectively as
possible. ABS (Anti-lock Braking System)
General information ABS regulates brake pressure in such a way that
the wheels do not lock when you brake. This
allows you to continue steering the vehicle when
braking.
The % ABS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out when the engine is running.
ABS works from a speed of about 5 mph
(8 km/h), regardless of road-surface conditions.
ABS works on slippery surfaces, even when you
only brake gently.
Important safety notes
i Observe the "Important safety notes" sec-
tion ( Y
page 64).
G WARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally, further driving safety systems are deac-
tivated. There is an increased danger of skid-
ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at a qualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp ( Y
page 229) and dis-
play messages which may be shown in the
instrument cluster ( Y
page 204).
Braking X
If ABS intervenes: continue to depress the
brake pedal vigorously until the braking sit-
uation is over. X
To make a full brake application: depress
the brake pedal with full force.
If ABS intervenes when braking, you will feel a
pulsing in the brake pedal.
The pulsating brake pedal can be an indication
of hazardous road conditions, and functions as a
reminder to take extra care while driving.64
Driving safety systems
Safety

Deactivating/activating ESP ®
(Mercedes ‑ AM G vehicles )Important safet y notes
i Observ e th e "Important safet y notes" sec -
tion ( Y
page 64).
You can selec t between th e followin g states of
ES P ®
: R
ES P ®
is activated.R
SPORT handlin g mode is activated.R
ES P ®
is deactivated.
G WARNING
Whe n SPORT handlin g mode is activated,
there is a greater ris k of skidding and acci-
dents .
Only activat e SPORT handlin g mode in th e sit -
uation s described in th e following.
G WARNING
If you deactivat e ES P ®
, ES P ®
no longer sta-
bilizes th e vehicle. There is an increase d ris k
of skidding and an accident.
Only deactivat e ES P ®
in th e situation s descri-
bed in th e following.
! Avoid spinnin g th e driven wheels fo r an
extended period wit h ES P ®
deactivated. You
could otherwise damage th e drivetrain .
In th e followin g situations, it may be bette r to
activat e SPORT handlin g mode or deactivat e
ES P ®
: R
when usin g snow chain sR
in dee p snowR
on san d or grave lR
on specially designated roads when th e vehi-
cle's own oversteering and understeering
characteristics are desire d
Spinning th e wheels result s in a cutting action
whic h provides bette r grip.
Driving in SPORT handlin g mode or without
ES P ®
require s an extremely qualified and expe-
rienced driver .
i Activat e ES P ®
as soo n as th e situation s
described abov e no longer apply . ES P ®
will
otherwise no t be able to stabilize th e vehicle if th e vehicle start s to skid or a whee l start s to
spin.
Deactivating/activating ESP ®
X
To activate SPORT handling mode: briefly
press butto n C .
The t SPORT handlin g mode warnin g
lamp in th e instrumen t cluster lights up. The
SPORT handling mod e
messag e appears in
th e multifunction display. X
To deactivate SPORT handling mode:
briefly press butto n C .
The t SPORT handlin g mode warnin g
lamp in th e instrumen t cluster goe s out .X
To deactivate ESP ®
: press butto n C until
th e

tions of KEYLESS-GO with those of a conven-
tional SmartKey. Unlock the vehicle by using
KEYLESS-GO, for instance, and lock it using the
7 button on the SmartKey.
When locking or unlocking with KEYLESS-GO,
the distance between the SmartKey and the cor-
responding door handle must not be greater
than 3 ft (1 m).
A brief radio connection between the vehicle
and the SmartKey determines whether a valid
SmartKey is in, or in the direct vicinity of, the
vehicle. This occurs, for example: R
when the external door handles are touched R
when starting the engine R
while the vehicle is in motion
X
To unlock the vehicle: touch the inner sur-
face of the door handle. X
To lock the vehicle: touch sensor sur-
face C .X
Convenience closing feature: touch
recessed sensor surface D for an extended
period.
Further information on the convenience clos-
ing feature ( Y
page 88).X
To unlock the trunk lid: pull the handle on
the trunk lid.
The vehicle only unlocks the trunk lid.
Deactivating and activating If you do not intend to use a SmartKey for an
extended period of time, you can deactivate the
KEYLESS-GO function of the SmartKey. The
SmartKey will then use very little power, thereby
conserving battery power. For the purposes of
activation/deactivation, the vehicle must not be
nearby. X
To deactivate: press the 7 button on the
SmartKey twice in rapid succession.
The battery check lamp of the SmartKey
( Y
page 79) flashes twice briefly and lights
up once, then KEYLESS-GO is deactivated. X
To activate: press any button on the Smart-
Key.
or X
Insert the SmartKey into the ignition lock.
KEYLESS-GO and all of its associated features
are available again.
Changing the settings of the locking
system You can change the settings of the locking sys-
tem. 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
alone. X
To change the setting: press and hold down
the 6 and 7 buttons simultaneously
for approximately six seconds until the bat-
tery check lamp ( Y
page 79) flashes twice.
If the setting of the locking system is changed
within the signal range of the vehicle, pressing
the 7 or 6 button: R
locks or R
unlocks the vehicle
The SmartKey now functions as follows: X
To unlock: press the 6 button once.X
To unlock centrally: press the 6 button
twice. X
To lock centrally: press the 7 button.
The KEYLESS-GO function is changed as fol-
lows: X
To unlock the driver's door: touch the inner
surface of the door handle on the driver's
door. X
To unlock centrally: touch the inner surface
of the door handle on the front-passenger
door or the rear door. X
To lock centrally: touch the outer sensor
surface on one of the door handles. X
To restore the factory settings: press and
hold the 6 and 7 buttons simultane-
ou
sly fo r approximately six seconds until theSmartKey 77
Opening and closing Z

Checking the battery X
Press the 7 or 6 button.
The battery is working properly if battery
check lamp C lights up briefly.
The battery is discharged if battery check
lamp C does not light up briefly.X
Change the battery ( Y
page 79).
If the SmartKey battery is checked within the
signal reception range of the vehicle, pressing
the 7 or 6 button:R
locks or R
unlocks the vehicle
i You can get a battery at any qualified spe-
cialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery. X
Take the mechanical key out of the SmartKey
( Y
page 78). X
Press mechanical key D into the SmartKey
opening in the direction of the arrow until bat-
tery compartment cover C opens. Do not
hold battery compartment cover C closed
while doing so. X
Remove battery compartment cover C .
X
Repeatedly tap the SmartKey against your
palm until battery

Problem
Possible causes/consequences and P Solutions
The engine cannot be
started using the Smart-
Key. The on-board voltage is too low. X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work: X
Check the starter battery and charge it if necessary ( Y
page 284).
or X
Jump-start the vehicle ( Y
page 285).
or X
Consult a qualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
There is interference from a powerful source of radio waves. X
Start your vehicle with the SmartKey in the ignition lock.
You have lost a Smart-
Key. X
Have the SmartKey deactivated at a qualified specialist workshop. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
Doors
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
Unlocking and opening doors from
the inside You can open a door from inside the vehicle
even if it has been locked.
If the vehicle has previously been locked from
the outside, opening a door from the inside will
trigger the anti-theft alarm system. Switch off
the alarm ( Y
page 75).
You can only open the rear doors from inside the
vehicle if they are not secured by the child-proof
locks ( Y
page 63). Doors 81
Opening and closing Z

G WARNING
The reversing feature does not respond: R
to soft, light and thin objects, e.g. fingers R
over the last 1/3 in (8 mm) of the closing
movement
The reversing feature cannot prevent some-
one being trapped in these situations in par-
ticular. There is a risk of injury.
Make sure that no body parts are in close
proximity during the closing procedure.
If somebody becomes trapped: R
press the T button on the SmartKey, orR
pull or press the remote operating switch
on the driver's door or R
press the closing or locking button on the
trunk lid, or R
pull on the trunk lid handle
Opening/closing from outside
Opening
X
Press the 6 button on the SmartKey.X
Pull handle C .X
Raise the trunk lid. Closing X
Pull the trunk lid down using recess C .X
If necessary, lock the vehicle with the 7
button on the SmartKey ( Y
page 76) or with
KEYLESS-GO ( Y
page 76).
If KEYLESS-GO detects only one SmartKey in the
trunk after it closed, the trunk lid opens again. If
KEYLESS-GO detects a second SmartKey out-
side the vehicle, the trunk lid remains closed.
Opening/closing automatically from
outside
Important safety notes
G WARNING
Parts of the body could become trapped dur-
ing automatic closing of the trunk lid. More-
over, people, e.g. children, may be standing in
the closing area or may enter the closing area
during the closing process. There is a risk of
injury.
Make sure that nobody is in the vicinity of the
closing area during the closing process.
Use one of the following options to stop the
closing process: R
press the T button on the SmartKey. R
pull or press the remote operating switch
on the driver's door. R
press the closing or locking button on the
trunk lid. R
pull the trunk lid handle84
Trunk
Opening and closing

! The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
The opening dimensions of the trunk lid can be
found in the "Vehicle data" section
( Y
page 328).
Opening and closing X
To open: pull remote operating switch for
trunk lid C until the trunk lid opens.X
To close: press remote operating switch for
trunk lid C until the trunk lid is completely
closed.
You can open and close the trunk lid from the
driver's seat when the vehicle is stationary and
unlocked.
Unlocking the trunk
! The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
If the trunk cannot be unlocked with the Smart-
Key or KEYLESS-GO, use the mechanical key.
If you use the mechanical key to unlock and
open the trunk lid, the anti-theft alarm system
will be triggered. Switch off the alarm
( Y
page 75). X
Take the mechanical key out of the SmartKey
( Y
page 78).X
Insert the mechanical key into the trunk lid
lock as far as it will go. X
Turn the mechanical key from position G
counter-clockwise as far as it will go to posi-
tion H . Simultaneously pull the trunk lid han-
dle.
The trunk is unlocked. X
Turn the mechanical key back to position G
and remove it. X
Insert the mechanical key into the SmartKey.
Emergency release for the trunk You can open the trunk lid from inside the vehi-
cle with the emergency release button.
X
Press emergency release button C briefly.
The trunk lid unlocks and opens.
The trunk lid can be unlocked and opened with
the trunk lid emergency release when the vehi-
cle is stationary or while driving.
The trunk lid emergency release does not open
the trunk lid if the battery is disconnected or
discharged.
Trunk lid emergency release light: R
Emergency release button C flashes for
30 minutes after the trunk lid is opened. R
Emergency release button C flashes for
60 minutes after the trunk lid is closed.86
Trunk
Opening and closing