If children open a door, they could injure other
persons or get out of the vehicle and injure
themselves or be injured by following traffic.
Do not expose the child restraint system to
direct sunlight. The child restraint system's
metal parts, for example, could become very
hot, and the child could be burned on these
parts.
Override feature for the rear side
windowsGWARNING
When children ride on the vehicle's rear seats,
activate the override switch. Otherwise the
children could be injured, e.g. by trapping
themselves in the rear side window.
XTo activate/deactivate: press button :.
If indicator lamp ; is lit, operation of the
rear side windows is deactivated.
Operation is only possible using the
switches in the driver's door. If indicator
lamp ; is off, operation is possible using
the switches in the rear compartment.Panic alarmX To activate: press ! button : for
approximately one second.
An alarm sounds and the exterior lighting
flashes.XTo deactivate: press ! button :
again.
or
XInsert the SmartKey into the ignition lock.
or
XPress the KEYLESS-GO Start/Stop button.
The KEYLESS-GO key must be in the
vehicle.
Driving safety systems
Overview of driving safety systems
In this section, you will find information about
the following driving safety systems:
R ABS ( Anti-lock Braking System)
R BAS ( Brake Assist System)
R BAS PLUS ( Brake Assist System Plus)
R ESP ®
(E lectronic Stability Program)
R EBD ( Electronic Brake force Distribution)
R ADAPTIVE BRAKE
R PRE-SAFE ®
Brake
Important safety notes
If you fail to adapt your driving style or
become distracted, the driving safety
64Driving safety systemsSafety
! Avoid spinning the driven wheels for an
extended period with ESP ®
deactivated.
You could otherwise damage the drivetrain.XTo deactivate: (Y page 348).
The å ESP®
OFF warning lamp in the
instrument cluster lights up.
CL 63 AMG: deactivate ESP ®
when driving
on designated roads when the vehicle's
own oversteering and understeering
characteristics are desired. Driving without
ESP ®
requires an extremely qualified and
experienced driver who is able to cope with
these critical driving conditions.XTo activate: (Y page 348).
The å ESP®
OFF warning lamp in the
instrument cluster goes out.
ESP ®
is activated automatically when the
engine is started.
If ESP ®
is deactivated and one or more wheels
start to spin, the ÷ ESP®
warning lamp in
the instrument cluster flashes. In such
situations, ESP ®
will not stabilize the vehicle.
It may be best to deactivate ESP ®
in the
following situations:
R when using snow chains
R in deep snow
R on sand or gravel
If you deactivate ESP ®
:
R ESP ®
no longer improves driving stability.
R traction control is still activated.
R ESP ®
still provides support when you
brake.
R the engine's torque is no longer limited, and
the drive wheels can spin. The spinning of
the wheels results in a cutting action, which
provides better grip.
Vehicles with ECO start/stop function: the
ECO start/stop function switches the engine
off automatically when the vehicle comes to
a stop. The engine starts automatically when
the driver wants to pull away again. ESP ®
remains in its previously selected status.
Example: if ESP ®
was deactivated before the
engine was switched off, ESP ®
remains
deactivated when the engine is switched on
again.
EBD (electronic brake force
distribution)
i Observe the "Important safety notes"
section ( Y page 64).
GWARNING
If EBD has malfunctioned, the rear wheels can
still lock, e.g. under full braking. This
increases the risk of skidding and an accident.
You should therefore adapt your driving style
to the different handling characteristics. Have
the brake system checked at a qualified
specialist workshop.
Observe information regarding indicator and
warning lamps ( Y page 391) as well as
display messages ( Y page 357).
EBD monitors and controls the brake
pressure on the rear wheels to improve
driving stability while braking.
ADAPTIVE BRAKE
ADAPTIVE BRAKE enhances braking safety
and offers increased braking comfort. In
addition to the braking function, ADAPTIVE
BRAKE also has the HOLD function
( Y page 308) and hill start assist
( Y page 275).
PRE-SAFE ®
Brake
i Observe the "Important safety notes"
section ( Y page 64).
PRE-SAFE ®
Brake is only available in vehicles
with DISTRONIC PLUS.
PRE-SAFE ®
Brake can help you to minimize
the risk of a collision with a vehicle ahead or
reduce the effects of such a collision. If PRE-
SAFE ®
Brake has detected a risk of collision,
68Driving safety systemsSafety
you will be warned visually and acoustically
as well as by automatic braking. PRE-SAFE ®
Brake cannot prevent a collision without your
intervention.
Starting at a speed of around 4 mph
(7 km/h), this function warns you if you
rapidly approach a vehicle in front. An
intermittent warning tone will then sound and
the · distance warning lamp will light up
in the instrument cluster.XBrake immediately in order to increase the
distance from the vehicle in front.
or
XTake evasive action provided it is safe to do
so.
From a speed of approximately 4 mph
(7 km/h), if the driver and front passenger
have fastened their seat belts, PRE-SAFE ®
Brake can brake the vehicle automatically at
speeds up to approximately 124 mph
(200 km/h).
Due to the nature of the system, particularly
complicated driving conditions may cause
unnecessary warnings or the unnecessary
intervention of PRE-SAFE ®
Brake.
You can prevent the intervention of the PRE-
SAFE ®
Brake at any time by:
R depressing the accelerator pedal further.
R activating kickdown.
R releasing the brake pedal.
The braking action of PRE-SAFE ®
Brake is
ended automatically if:
R you maneuver to avoid the obstacle.
R there is no longer any danger of a rear-end
collision.
R there is no longer an obstacle detected in
front of your vehicle.
With the help of the radar sensor system,
PRE-SAFE ®
Brake can detect obstacles that
are in front of your vehicle for an extended
period of time.
At speeds up to approximately
40 mph (70 km/h), PRE-SAFE ®
Brake can
also detect stationary obstacles such as
stopped or parked vehicles.
If you approach an obstacle and PRE-SAFE ®
Brake detects a risk of collision, the system
will initially alert you both visually and
acoustically. If you do not brake or take
evasive action, the system will warn you by
automatically braking the vehicle gently. If
there is an increased risk of collision,
preventative passenger protection measures
(PRE-SAFE ®
) are activated ( Y page 55). If a
risk of collision remains at speeds of over
20 mph (30 km/h) and you do not brake, take
evasive action or significantly accelerate,
automatic emergency braking may be
performed up to and including full brake
application. Automatic emergency braking is
not performed until immediately prior to an
accident that can no longer be avoided.GWARNING
PRE-SAFE ®
Brake will initially brake your
vehicle by a partial application of the brakes
if a danger of collision is detected. There may
be a collision unless you also brake.
Automatic emergency braking cannot prevent
a collision. There is a risk of an accident.
Always apply the brakes yourself and try to
take evasive action.
GWARNING
PRE-SAFE ®
Brake cannot always clearly
identify objects and complex traffic
conditions.
In these cases, PRE-SAFE ®
Brake may:
R give an unnecessary warning and then
brake the vehicle
R not give a warning or intervene
There is a risk of an accident.
Always pay particular attention to the traffic
situation and be ready to brake, especially if
PRE-SAFE ®
Brake warns you. Terminate the
intervention in a non-critical driving situation.
Driving safety systems69SafetyZ
iIf the alarm stays on for more than
30 seconds, the mbrace (USA only) or TELE
AID (Canada only) emergency call system
initiates a call to the Customer Assistance
Center automatically. The emergency call
system initiates the call provided that:
R you have subscribed to the mbrace/
TELE AID service.
R the mbrace/TELE AID service has been
activated properly.
R the required mobile phone, power supply
and GPS are available.XTo arm: lock the vehicle with the SmartKey
or KEYLESS-GO.
Indicator lamp : flashes. The alarm
system is armed after approximately
30 seconds.XTo disarm: unlock the vehicle with the
SmartKey or KEYLESS-GO.XTo stop the alarm using the SmartKey:
insert the SmartKey into the ignition lock.
The alarm is switched off.
or
XPress the % or & button on the
SmartKey.
The alarm is switched off.XTo stop the alarm using KEYLESS-GO:
grasp the outside door handle. The
SmartKey must be outside the vehicle.
The alarm is switched off.
or
XPress the Start/Stop button on the
dashboard. The SmartKey must be inside
the vehicle.
The alarm is switched off.Theft deterrent locking system71SafetyZ
2. This device must be able to
accommodate interference that is
received, including interference which
could cause unwanted functions.
Unapproved modifications to this device
may lead to withdrawal of permission to
operate it.
The product label with FCC ID and IC
certification number can be found in the
battery case of the SmartKey.
Important information for using
KEYLESS-GO
R You can use the KEYLESS-GO key as a
conventional key.
R You can combine KEYLESS-GO functions
with those of a conventional key, e.g. open
with KEYLESS-GO and close with the
& button.
R Always carry your KEYLESS-GO key on your
person.
R Never keep the KEYLESS-GO key with:
- electronic equipment, such as your
mobile phone or another key
- metal objects, such as coins or metal foil
This may impair the functioning of
KEYLESS-GO.
R To open or close the vehicle, the KEYLESS-
GO key should be no more than 3 ft (1 m)
from the door or trunk.
R If the vehicle is parked for more than
72 hours, the KEYLESS-GO function is
deactivated. Pull one of the outer door
handles and turn on the ignition to
reactivate the KEYLESS-GO function.
R When the KEYLESS-GO key is removed
from the vehicle, it is possible that the
system may not recognize it. In this case,
the vehicle cannot be locked or started with
KEYLESS-GO.
R If the KEYLESS-GO key has been removed
from the vehicle, e.g. if a passenger leaves
the vehicle with the KEYLESS-GO key:
- while someone is holding the Start/Stop
button or attempting to lock the vehicle
using the outer door handle, the Key
Not Detected message will appear in
the multifunction display.
- while the engine is running, the red Key
Not Detected message will appear in
the multifunction display as you pull
away. Find the KEYLESS-GO key and
change its position in the vehicle. Place
the KEYLESS-GO key in a location such
as the front-passenger seat, or carry it in
your shirt pocket.
R If you have started the engine using the
Start/Stop button, you can turn if off again
by:
- pressing the Start/Stop button again
- inserting the KEYLESS-GO key into the
ignition lock when the vehicle is
stationary and the automatic
transmission is in parking position P.
R You may accidentally unlock the vehicle if
the KEYLESS-GO key is within 3 ft (1 m) of
the vehicle and:
- a jet of water splashes an outer door
handle
or
- you are cleaning an outer door handle.
R Note that the engine can be started by any
vehicle occupant if a KEYLESS-GO key is in
the vehicle.
Option 1: there is a KEYLESS-GO key in the
vehicle and a KEYLESS-GO key outside the
vehicle. If you leave the KEYLESS-GO key
behind when you get out and lock the
vehicle, a message does not appear in the
multifunction display.
Option 2: there is a KEYLESS-GO key in the
vehicle but no KEYLESS-GO key outside the
vehicle. When you get out and try to lock
the vehicle, the Key Detected in
Vehicle message appears in the
multifunction display. The vehicle is not
locked in this case.
When starting the engine and while driving,
KEYLESS-GO also checks whether a valid key76SmartKeyOpening and closing
is in the vehicle by periodically establishing
radio contact.X To unlock the vehicle: pull the door
handle.XTo lock the vehicle: touch sensor
surface :.
If you pull on the handle of the trunk lid, only
the trunk of the vehicle is unlocked.
Changing the settings of the locking
system
You can change the settings of the locking
system in such a way that only the driver's
door and the fuel filler flap are unlocked. This
is useful if you frequently travel on your own.
XTo change the setting: press the %
and & buttons until the battery check
lamp ( Y page 78) flashes twice.
The SmartKey now functions as follows:
XTo unlock the driver's door: press the
% button once.XTo unlock centrally: press the %
button twice.XTo lock centrally: press the & button.The KEYLESS-GO function is changed as
follows:XTo unlock the driver's door : pull the door
handle on the driver's door.XTo unlock centrally: pull the door handle
on the front-passenger door.XTo lock centrally: touch the outer sensor
surface on one of the door handles.
Restoring the factory settings
XPress the % and & buttons
simultaneously for approximately six
seconds until the battery check lamp
flashes twice.
Mechanical key
General notes
If you use the mechanical key to unlock and
open the driver's door or the trunk lid, the
anti-theft alarm system will be triggered
( Y page 70).
There are several ways to turn off the alarm:
XTo stop the alarm with the SmartKey:
press the % or & button on the
SmartKey.
or
XInsert the SmartKey into the ignition lock.
or
XTo stop 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.SmartKey77Opening and closingZ
Opening and closing manually
Opening the trunk lid
You can only open the trunk lid after
unlocking it first.
XPress the % button on the key.XPull handle :.
Closing the trunk lid
GWARNING
To prevent possible personal injury, always
keep hands and fingers away from the trunk
opening when closing the trunk lid. Be
especially careful when small children are
around.
XPull the trunk lid down using recess :.XLock the vehicle if necessary with
the & button on the key or with
KEYLESS-GO ( Y page 75).Opening/closing automatically from
outside
Important safety notesGWARNING
Make sure the trunk lid is closed when the
engine is running and while driving. Among
other dangers, deadly carbon monoxide (CO)
gases may enter the vehicle interior resulting
in unconsciousness and death.
! The trunk lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the trunk lid.
To open the trunk lid completely, a minimum
clearance of 5.90 ft (1.80 m) above the
ground is necessary.
Opening
You can open the trunk lid with the SmartKey.
XPress and hold the F button on the
SmartKey until the trunk lid opens.
Closing
GWARNING
Monitor the closing procedure carefully to
make sure no one is in danger of being
injured. To prevent possible personal injury,
always keep hands and fingers away from the
trunk opening when closing the trunk lid. Be
especially careful when small children are
around. To stop the closing procedure, do one
of the following:
R Press button F on the SmartKey.
R Press the remote trunk opening/closing
switch (on the driver's door).
R Press the trunk closing switch.
R Press the KEYLESS-GO locking/closing
switch.
R Pull the trunk lid handle.
Even with the SmartKey removed from the
starter switch or the SmartKey with KEYLESS-
GO removed from the vehicle, the remote
Trunk85Opening and closingZ
Opening and closing the side
windows:Front left;Front right=Rear right?Rear left
The switches for all side windows are located
on the driver's door. There is also a switch on
the front-passenger door as well as on the
doors in the rear compartment on the left and
right-hand sides for the respective side
window.
i It is not possible to operate the door
windows from the rear compartment when
the override feature is activated for the
door windows.
XTurn the SmartKey to position 1 in the
ignition lock.XTo open: press the corresponding switch.XTo close: pull the corresponding switch.
i
You can start automatic operation when
opening and closing the front door windows
and when opening the rear door windows.
To do so, briefly press or pull the switch to
just beyond the point of resistance in the
relevant direction. You can stop automatic
operation by pressing or pulling again.
i You can continue to operate the side
windows after you switch off the engine.
This function remains active for five
minutes or until one of the doors is opened.
Convenience opening
You can ventilate the vehicle before you start
driving. To do this, you can use the SmartKey
to simultaneously:
R open the side windows
R open the sliding sunroof
R switch on the seat ventilation of the driver's
seat
i The convenience opening feature can
only be operated using the SmartKey. The
SmartKey must be close to the driver's
door handle.XPoint the tip of the SmartKey at the driver's
door handle.XUnlock the vehicle by pressing the %
button.XPress and hold the % button until the
side windows and the sliding sunroof are in
the desired position.XTo interrupt the convenience opening:
release the % button.
Convenience closing feature
General notes
When you lock the vehicle, you can
simultaneously:
R close the side windows
R close the sliding sunroof
GWARNING
When closing the door windows and the
sliding sunroof, make sure that there is no
danger of anyone being harmed by the closing
procedure.
If potential danger exists, proceed as follows:
R Release the & button to stop the closing
procedure. To open, press and hold the
% button. To continue the closing
procedure after making sure that there is
no danger of anyone being harmed by the
Side windows89Opening and closingZ