ignition MERCEDES-BENZ C-CLASS CABRIOLET 2016 User Guide

Important safety notes
In particular, the detection of obstacles can be
impaired in the following situations:
R dirt on the sensors or obscured sensors
R snow or heavy rain
R interference by other radar sources
R strong radar reflections, for example, in multi-
storey car parks
R a narrow vehicle travelling in front, e.g. a
motorcycle
R a vehicle travelling in front on a different line
R new vehicles or after the COLLISION PRE-
VENTION ASSIST PLUS system has been serv- iced
Observe the important safety notes in the
"Running-in notes" section (Y page 132).
Following damage to the front end of the vehicle, have the configuration and operation of the
radar sensor checked at a qualified specialist
workshop. This also applies to collisions at low
speeds where there is no visible damage to the front of the vehicle.
Activating/deactivating The COLLISION PREVENTION ASSIST PLUS is
automatically active when the ignition is
switched on.
You can activate or deactivate COLLISION PRE-
VENTION ASSIST PLUS in the on-board com-
puter (Y page 233). When the system is deac-
tivated, the distance warning function and the
autonomous braking function are also deactiva-
ted.
If COLLISION PREVENTION ASSIST PLUS is
deactivated, the æsymbol appears on the
assistance display.
Distance warning function General information
The distance warning function can help you to
minimise the risk of a rear-end collision with a
vehicle ahead or reduce the effects of such a
collision. If the distance warning function
detects a risk of collision with the vehicle in
front, you will be warned visually and audibly. Important safety notes
i Observe the "Important safety notes" sec-
tion for driving safety systems (Y page 67). G
WARNING
The distance warning function does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
Thus, the distance warning function cannot
provide a warning in all critical situations.
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake. G
WARNING
The distance warning function cannot always
clearly identify objects and complex traffic
situations.
In such cases, the distance warning function
may:
R give an unnecessary warning
R not give a warning
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation; do not rely on the distance warning
function alone.
Function The distance warning function issues a warning at speeds:
R of approximately 30 km/h or more if, over
several seconds, the distance maintained to
the vehicle travelling in front is insufficient.
The · distance warning lamp will then
light up on the instrument cluster.
R of approximately 7 km/h or more if you are
rapidly approaching a vehicle in front. An
intermittent warning tone will then sound and
the · distance warning lamp will light up
on the instrument cluster. 70
Driving safety systemsSafety

You can prevent the engagement of 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 manoeuvre to avoid the obstacle
R the danger of collision has passed
R an obstacle is no longer detected in front of
your vehicle STEER CONTROL
General information STEER CONTROL helps you by transmitting a
noticeable steering force to the steering wheel
in the direction required for vehicle stabilisation.
This steering support is provided in particular if:
R both right wheels or both left wheels are on a
wet or slippery road surface when you brake
R the vehicle begins to skid
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 67).
No steering support is provided from STEER
CONTROL, if:
R ESP ®
is deactivated
R ESP ®
is malfunctioning
R the steering is faulty
If ESP ®
is malfunctioning, you will be assisted
further by the electrical power steering. Protection against theft
Immobiliser
The immobiliser prevents your vehicle from
being started without the correct key.
X To activate with the key: remove the key
from the ignition lock.
X To activate with KEYLESS-GO start func-
tion or KEYLESS-GO: switch the ignition off
and open the driver's door.
X To deactivate: switch on the ignition. When leaving the vehicle, always take the key
with you and lock the vehicle. Anyone can start
the engine if a valid key has been left inside the vehicle.
i The immobiliser is always deactivated when
you start the engine. ATA (Anti-Theft Alarm system)
X
To activate: lock the vehicle with the key or
KEYLESS-GO.
Indicator lamp :flashes. The alarm system
is activated after approximately ten seconds.
X To deactivate: unlock the vehicle with the
key or KEYLESS-GO.
or X Insert the key into the ignition lock.
or X Vehicles with KEYLESS-GO start function
or KEYLESS-GO: press the Start/Stop but-
ton.
The key must be in the vehicle.
A visual and audible alarm is triggered if the
alarm system is activated and you open: R a door
R the vehicle with the emergency key element
R the boot lid
R the bonnet
R the stowage compartment / telephone com-
partment under the armrest in vehicles with
automatic transmission
X To stop the alarm with the key: press the
% or& button on the key.
The alarm stops.
or 78
Protection against theftSafety

X
Vehicles with KEYLESS-GO start function
or KEYLESS-GO: remove the Start/Stop but-
ton from the ignition lock (Y page 133).
X Insert the key into the ignition lock.
The alarm stops.
X To stop the alarm using KEYLESS-GO:
grasp the outside door handle. The key must
be outside the vehicle.
The alarm stops.
or X Press the Start/Stop button on the dash-
board. The key must be inside the vehicle.
The alarm stops.
The alarm does not stop, even if you close the
open door that has triggered it, for example.
i If the alarm stays on for more than
30 seconds, the Mercedes‑Benz emergency
call system automatically sends a message to
the Customer Centre. This is sent via text
message or a data connection.
The emergency call system sends a message
or establishes a data connection provided
that:
R you have subscribed to the Mercedes‑Benz
emergency call system
R the Mercedes‑ Benz emergency call system
has been activated properly
R the necessary mobile phone network is
available Tow-away protection
Function An audible and visual alarm is triggered if your
vehicle's angle of inclination is altered while
tow-away protection is primed. This can occur if
the vehicle is jacked up on one side, for exam-
ple.
Activating/deactivating Tow-away protection is automatically switched
on and off with the ATA (anti-theft alarm system) when:
R the doors are closed
R the boot lid is closed
Tow-away protection is active around
60 seconds after the ATA has been switched on (Y page 78). Deactivating To prevent a false alarm, deactivate tow-away
protection if you lock your vehicle and it:
R is being transported
R is being loaded, e.g. onto a ferry or car trans-
porter
R is parked on a movable surface, e.g. in a split-
level garage
The tow-away alarm remains deactivated until
you switch the ATA on again after opening a
door.
You can deactivate tow-away protection via the
multimedia system (see the Digital Owner's
Manual). Interior motion sensor
Function When the interior motion sensor is switched on,
a visual and audible alarm is triggered if move-
ment is detected in the vehicle interior. This can occur if someone reaches into the vehicle inte-
rior, for example.
Switching on/off The interior motion sensor is automatically
switched on and off with the ATA (Anti-Theft
Alarm system) when:
R the doors are closed
R the boot lid is closed
The interior motion sensor is active around ten
seconds after the ATA has been switched on
(Y page 78).
You can prevent false alarms by doing the fol-
lowing before switching on the ATA:
R close the side windows
R close the soft top
R make sure that no objects, such as mascots,
are attached to the rear-view mirror
Deactivating If you want to lock your vehicle and people or
animals are inside it, you can deactivate the
interior motion sensor.
The interior motion sensor remains deactivated
until you switch the ATA on again after opening
a door. Protection against theft
79Safety Z

Key
Important safety notes
United Kingdom only: G
WARNING
When the double locks are activated, the
doors can no longer be opened from the
inside. People in the vehicle can no longer get out, e.g. in hazardous situations. There is a
risk of injury.
Therefore, do not leave any people unsuper-
vised in the vehicle, particularly children, eld-
erly people or people in need of special assis-
tance. Do not activate the double lock when
people are in the vehicle.
If the vehicle has been locked from the outside, the double lock function is activated as stand-
ard. It is then not possible to open the doors
from inside the vehicle. You can deactivate the
double lock function by deactivating the interior
motion sensor (see Digital Owner's Manual).
The doors can then be opened from the inside
after the vehicle has been locked from the out-
side. The anti-theft alarm system is triggered if
the door is opened from the inside. Switch off
the alarm (Y page 78).
All countries: G
WARNING
If children are left unsupervised in the vehicle, they could:
R open doors, thereby endangering other per-
sons or road users
R get out and be struck by oncoming traffic
R operate vehicle equipment and become
trapped, for example
In addition, the children could also set the
vehicle in motion, for example, if they:
R release the parking brake
R shift the automatic transmission out of park
position P or shift manual transmission into
neutral
R start the engine
There is a risk of an accident and injury. When leaving the vehicle, always take the key
with you and lock the vehicle. Never leave
children and animals unattended in the vehi-
cle. Keep the keys out of the reach of children. G
WARNING
If you attach heavy or large objects to the key, the key could be unintentionally turned in the
ignition lock. This could cause the engine to
be switched off. There is a risk of an accident.
Do not attach any heavy or large objects to the
key. Remove any bulky keyrings before insert-
ing the key into the ignition lock.
! Keep the key away from strong magnetic
fields. Otherwise, the remote control function could be affected.
Strong magnetic fields can occur in the vicin-
ity of powerful electrical installations.
Do not keep the key: R with electronic devices, e.g. a mobile phone
or another key
R with metallic objects, e.g. coins or metal foil
R inside metallic objects, e.g. a metal case
This can impair the key's function.
Vehicles with KEYLESS-GO start function: do
not keep the key in the boot. Otherwise, the key
may not be detected, e.g. when starting the
engine using the Start/Stop button.
A check that periodically establishes a radio
connection between the vehicle and the key
determines whether a valid key is in or in the
direct vicinity of the vehicle. This occurs, for
example:
R during engine start
R during driving
R when the external door handles are touched
R during convenience closing Key
81Opening and closing Z

Make sure that you do not touch the inner
surface of the door handle.
X Convenience closing feature: touch
recessed sensor surface ;for an extended
period.
Deactivating and activating If you do not intend to use a key for an extended
period of time, you can deactivate the KEYLESS-
GO function of the key. The key will then use very
little power, thereby conserving battery power.
For the purposes of activation or deactivation,
the vehicle does not have to be nearby.
X To deactivate: press the&button on the
key twice in rapid succession.
The battery indicator lamp (Y page 84) of
the key flashes twice briefly and lights up
once, then KEYLESS-GO is deactivated.
X To activate: press any button on the key.
or X Insert the key into the ignition lock.
KEYLESS-GO and all its associated features
are available again. KEYLESS-GO start function
General notes Bear in mind that the engine can be started by
any of the vehicle occupants if there is a key in
the vehicle (Y
page 135). 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: simultaneously press
the % and& buttons for approximately
six seconds until the battery check lamp
(Y page 84) flashes twice.
If the setting of the locking system is changed
within the signal range of the vehicle, pressing
the & or% button:
R locks or
R unlocks the vehicle The key now functions as follows:
X To unlock: press the%button once.
X To unlock centrally: press the%button
twice.
X To lock: press the &button.
The KEYLESS-GO functions can be changed as
follows: 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 front-passenger door handle.
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 %and& buttons simultane-
ously for approximately six seconds until the
battery check lamp (Y page 84) flashes
twice. Emergency key element
General notes If the vehicle can no longer be unlocked with the
key or KEYLESS-GO, use the emergency key ele-
ment.
If you use the emergency key element to unlock
and open the driver's door, the anti-theft alarm
system will be triggered. Switch off the alarm
(Y page 78).
If you unlock the vehicle using the emergency
key element, the fuel filler flap will not be
unlocked automatically.
X To unlock the fuel filler flap: insert the key
into the ignition lock. Key
83Opening and closing Z

Problem
Possible causes/consequences and
M
MSolutions You can no longer lock or
unlock the vehicle using
KEYLESS-GO. KEYLESS-GO has been deactivated.
X Reactivate KEYLESS-GO (Y page 82). The key battery is weak or discharged.
X Check the key battery (Y page 84) and replace if necessary
(Y page 84).
If this does not work: X Lock or unlock the vehicle using the emergency key element
(Y page 89). Interference from a powerful source of radio waves.
X Lock or unlock the vehicle using the emergency key element
(Y page 89). Fault with KEYLESS-GO.
X Lock or unlock the vehicle using the remote control function of the
key.
X Have the vehicle and key checked at a qualified specialist work-
shop.
If the vehicle cannot be locked or unlocked even using the remote
control function:
X Lock or unlock the vehicle using the emergency key element
(Y page 89).
X Have the vehicle and key checked at a qualified specialist work-
shop. The engine cannot be
started using the 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 332).
or X Jump-start the vehicle (Y page 333).
or X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The key is in
the vehicle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The key battery is weak or discharged.
X Check the key battery (Y page 84) and replace if necessary
(Y page 84).
If this does not work: X Start your vehicle with the key in the ignition lock. Interference from a powerful source of radio waves.
X Start your vehicle with the key in the ignition lock. 86
KeyOpening and closing

You can open a door from inside the vehicle
even if it has been locked. If the vehicle has pre-
viously been locked with the key or with KEY-
LESS-GO, opening a door from the inside will
trigger the anti-theft alarm system. Switch off
the alarm (Y page 78). X
Pull door handle ;.
If the door is locked, locking knob :pops up.
The door is unlocked and opens. Centrally locking and unlocking the
vehicle from the inside
You can centrally lock and unlock the vehicle
from the inside. The switches are on the driver's door. X
To unlock: press button :.
X To lock: press button ;.
When the front-passenger door is closed, the
vehicle is locked.
This does not lock or unlock the fuel filler flap or the glove compartment.
You cannot unlock the vehicle centrally from the
inside if the vehicle has been locked with the key or KEYLESS-GO.
For all countries except the United Kingdom: The doors can be opened from the inside.
If the vehicle has previously been locked with
the key or with KEYLESS-GO, opening a door
from the inside will trigger the anti-theft alarm
system. Switch off the alarm (Y page 78).
United Kingdom only: if the vehicle has been
locked with the key or with KEYLESS-GO, the
double lock function is activated as standard. It is then not possible to open the doors from
inside the vehicle. You can deactivate the dou-
ble lock function by deactivating the interior
motion sensor (see Digital Owner's Manual).
Opening/closing doors is then possible as fol-
lows: the doors can be opened from inside.
When a locked door is opened from inside the
vehicle, the previous unlocking process will be
observed if the vehicle has been:
R locked with the locking button for the central
locking or
R locked automatically
The vehicle will be fully unlocked if it had previ-
ously been fully unlocked. Only the door that has been opened from the inside is unlocked if only
the driver's door had previously been unlocked. Automatic locking feature
X
To deactivate: press and hold button :for
approximately five seconds until a tone
sounds.
X To activate: press and hold button ;for
approximately five seconds until a tone
sounds.
If you press one of the two buttons and do not
hear a tone, the relevant setting has already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn-
ing. 88
DoorsOpening and closing

:
Front left
; Front right
= Rear right
? Rear left
X Turn the key to position 1or 2in the ignition
lock.
X To open manually: press and hold the cor-
responding button.
X To open fully: press the button beyond the
point of resistance and release it.
Automatic operation is started.
X To close manually: pull the corresponding
button and hold it.
X To close fully: pull the button beyond the
point of resistance and release it.
Automatic operation is started.
X To interrupt automatic operation: press/
pull the corresponding switch again.
If you press/pull the switch beyond the point of resistance and release, automatic operation is
started in the corresponding direction. You can
stop automatic operation by pressing/pulling
again.
You can continue to operate the side windows
after switching off the engine or removing the
key. This function remains active for five
minutes or until the driver's or front-passenger
door is opened. Opening and closing all side windows
Using the switch on the centre console G
WARNING
While closing the side windows, body parts in the closing area could become trapped. There is a risk of injury. When closing make sure that no parts of the
body are in the closing area. If somebody
becomes trapped, release the switch or press the switch to open the side window again.
Only vehicles with automatic transmission have
this function. You can use button
:to open or close all side
windows simultaneously.
X Turn the key to position 1or 2in the ignition
lock.
X To open all side windows: press and hold
button :to the point of resistance.
X To open all side windows fully: press but-
ton :beyond the point of resistance.
X To close all side windows: pull and hold
button :.
Using KEYLESS-GO G
WARNING
When using convenience closing, you could
become trapped within the sweep of the clos- ing window. There is a risk of injury.
Monitor the entire closing procedure when
using convenience closing. When closing,
make sure that no one has any parts of the
body within the closing area.
The key must be outside the vehicle. All the
doors must be closed. 92
Side windowsOpening and closing

X
Convenience closing feature: touch the
recessed sensor surface :on the door han-
dle until the side windows are fully closed.
i Make sure you touch only the recessed sen-
sor surface :.
X To interrupt convenience closing: release
recessed sensor surface :on the door han-
dle. Resetting the side windows
If a side window can no longer be closed fully,
you must reset it.
X Close all doors.
X Turn the key to position 1or 2in the ignition
lock.
X Close the soft top (Y page 95).
X Pull the corresponding switch on the door
control panel until the side window is com-
pletely closed (Y page 91).
X Hold the switch for an additional second.
If the side window opens again slightly: X Immediately pull the corresponding switch on
the door control panel until the side window is completely closed (Y page 91).
X Hold the switch for an additional second.
X If the corresponding side window remains
closed after the button has been released, the
side window has been reset correctly. If this is
not the case, repeat the steps above again. Problems with the side windows
G
WARNING
If you close a side window again immediately after it has been blocked or reset, the side window
closes with increased or maximum force. The reversing function is then not active. Parts of the
body could be trapped in the closing area in the process. This poses an increased risk of injury or even fatal injury.
Make sure that no parts of the body are in the closing area. To stop the closing process, releasethe switch or push the switch again to reopen the side window. Side windows
93Opening and closing Z

Problem
Possible causes/consequences and
M
MSolutions A side window cannot be
closed because it is
blocked by objects, e.g.
leaves in the window
guide. X
Remove the objects.
X Close the side window. A side window cannot be
closed and you cannot
see the cause. If a side window is obstructed during closing and reopens again
slightly:
X Immediately after the window blocks, pull the corresponding switch
again until the side window has closed.
The side window is closed with increased force.
If a side window is obstructed again during closing and reopens again slightly:
X Immediately after the window blocks, pull the corresponding switch
again until the side window has closed.
The side window is closed without the automatic reversing feature. Convertible top
Important safety notes
G
WARNING
If you do not fully open/close the soft top, the soft-top hydraulics depressurise after a short time. This causes the soft top to lower unex-
pectedly and may cause you or others to be
trapped. There is a risk of injury.
Always open or close the soft top completely.
! Never sit on the soft-top compartment
cover or stow heavy objects there. You will
otherwise damage the soft top and soft-top
compartment cover of the vehicle.
! When opening and closing the soft top,
make sure that:
R there is sufficient clearance above it, as the
soft top swings upwards
R the boot is only loaded to below the boot
separator
R the boot separator is not pushed up by the
load
R the boot lid is closed
R there are no objects on the soft-top com-
partment cover
R the soft-top fabric is not dirty, wet or frozen
You could otherwise damage the soft top,
boot and other parts of the vehicle. Take the height of the vehicle into account when
opening and closing the soft top (Y page 367).
Make sure that the soft top is dry and clean
before opening it. Otherwise, water or dirt could enter the vehicle interior or boot.
You can open or close the soft top:
R when the vehicle is stationary or
R when you are not exceeding a speed of
50 km/h (max. 60 km/h, to avoid interrupting
the closing process while slightly exceeding
the speed limit).
If there is a strong headwind, it may not be pos-
sible to close the soft top fully. In this case,
reduce speed or stop in order to close the soft
top fully.
For safety reasons, Mercedes-Benz recom-
mends that you open or close the soft top only
when the vehicle is stationary.
If the soft top does not open or close fully, the
soft-top hydraulics are depressurised and the
soft top is lowered:
R after about seven minutes if the ignition is
switched on
R after about 20 seconds if the ignition is
switched off 94
Convertible topOpening and closing