light MERCEDES-BENZ C-CLASS CABRIOLET 2016 Service Manual

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

Removing the emergency key element
X
Push release catch :in the direction of the
arrow and, at the same time, remove emer-
gency key element ;from the key.
Further information on locking/unlocking the
driver's door (Y page 89).
Inserting the emergency key element X
Push emergency key element ;completely
into the key until it engages and release
catch :is back in its basic position. Battery of the key
Important safety notes G
WARNING
Batteries contain toxic and corrosive substan- ces. If batteries are swallowed, it can result in
severe health problems. There is a risk of fatal injury.
Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention immediately. H
Environmental note Batteries contain pollutants.
It is illegal to dispose of them with the household rubbish.
They must be collected sep-
arately and disposed of in an environmentally responsible
recycling system.
Dispose of batteries in an
environmentally responsible
manner. Take discharged
batteries to a qualified spe-
cialist workshop or to a col-
lection point for used batter-
ies.
Mercedes-Benz recommends that you have the
batteries replaced at a qualified specialist work- shop.
Checking the battery X
Press the &or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharged if battery check
lamp :does not light up briefly.
X Replace the battery (Y page 84).
If the key battery is checked within the signal
reception range of the vehicle, pressing the
& or% button:
R locks or
R unlocks the vehicle
i You can obtain a battery from any qualified
specialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery.
X Take the emergency key element out of the
key (Y page 84). 84
KeyOpening and closing

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

Problem
Possible causes/consequences and
M
MSolutions You have lost a key. X
Have the key 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 emer-
gency key element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. Doors
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. Unlocking and opening the doors
from the inside
When a door is opened, the side window on that side opens slightly. When the door is closed, the
side window is raised again.
! The side windows will not open/close if the
battery is discharged or if the side windows
have iced up. It will then not be possible to
close the door. Do not attempt to force the
door to close. You could otherwise damage
the door or the side window.
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).
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).
For all countries except the United Kingdom: Doors
87Opening and closing Z

Locking the boot separately
The "separate boot locking" function is available
only in certain countries.
You can lock the boot separately. If you then
unlock the vehicle centrally, the boot remains
locked and cannot be opened. X
To activate: close the boot lid.
X Open the glove compartment.
X Push the switch to position :.
If the vehicle is unlocked centrally, the boot
remains locked.
i You can also lock the glove compartment
(Y page 297).
X To deactivate: open the glove compartment.
X Push the switch to position ;.
If the vehicle is unlocked centrally, the boot
will also be unlocked. Side windows
Important safety notes
G
WARNING
While opening the side windows, body parts
could become trapped between the side win- dow and the door frame as the side window
moves. There is a risk of injury.
Make sure that nobody touches the side win-
dow during the opening procedure. If some-
body becomes trapped, release the switch or pull the switch to close the side window again. 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. Side window reversing feature
The side windows are equipped with an auto-
matic reversing feature. If a solid object blocks
or restricts a side window from travelling
upwards during the automatic closing process,
the side window opens again automatically. Dur-
ing the manual closing process, the side window
only opens again automatically after the corre-
sponding switch is released. The automatic
reversing feature is only an aid and is no substi- tute for your attention when closing a side win-
dow. G
WARNING
The reversing function does not react:
R to soft, light and thin objects, e.g. small fin-
gers
R while resetting
This means that the reversing feature cannot
prevent someone being trapped in these sit-
uations. There is a risk of injury.
When closing, make sure that no parts of the
body are in the closing area. If someone
becomes trapped, press the switch to open
the side window again. Opening and closing the side win-
dows
The switches for the side windows are located
on the driver's door. There is also a switch for
the front-passenger side window on the front-
passenger door.
The switches on the driver's door take prece-
dence. Side windows
91Opening and closing Z

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

AIRCAP has the following components:
R a wind deflector above the windscreen
R a draught stop behind the two rear-seat head
restraints
When AIRCAP has been activated, the draught
stop extends up between the two rear-seat head
restraints. At the same time, the wind deflector
extends out along the front windscreen.
AIRCAP can be activated or deactivated up to
speeds of approximately 160 km/h.
Activating and deactivating AIRCAP X
Turn the key to position 2in the ignition lock.
X To activate: pull switch:.
The draught stop behind the rear-seat headr-
ests and the wind deflector in the roof frame
extend simultaneously. The indicator lamp in
switch :lights up.
X To deactivate: press switch:.
The draught stop behind the rear-seat headr-
ests and the wind deflector in the roof frame
retract simultaneously. The indicator lamp in
switch :goes out.
If you park your vehicle with the soft top down
and remove the key, the wind deflector and the
draught stop retract automatically. When you
restart your engine after having been parked,
the wind deflector and the draught stop extend
again automatically.
AIRCAP cannot be extended or retracted if the
vehicle speed exceeds approximately
160 km/h. Folding draught stop
Important safety notes G
WARNING
If you use the draught stop in darkness or in
other conditions offering poor visibility, your
view to the rear is further impaired. There is a
risk of an accident.
Only use the draught stop when visibility con- ditions are good. G
WARNING
If the draught stop is not fitted correctly, it
could come loose during the journey and
endanger other road users. There is a risk of
an accident and injury.
Fit the draught stop as described.
! Fit or remove the draught stop only when
the soft top is open. You could otherwise
damage the draught stop or the vehicle inte-
rior.
! Observe the backrest position of the front
seats if the draught stop is installed, since the
backrest could collide with the draught stop
here.
! Mercedes-Benz recommends that you only
use draught stops which have been tested
and approved for Mercedes-Benz vehicles.
This helps to prevent damage to the vehicle.
The folding draught stop protects against wind
when driving with the soft top open. It is secured
above the rear bench seats. For this reason, only the driver and the front passenger can travel in
the vehicle when the folding draught stop is fit-
ted.
The folding draught stop can be fitted or
removed from the driver's side or passenger
side.
You should preferably perform operations
involving the folding draught stop on the side
facing away from traffic, after you have stopped the vehicle, paying attention to road and traffic
conditions. Convertible top
97Opening and closing Z

Correct driver's seat position
G
WARNING
You could lose control of the vehicle while
driving if you:
R adjust the driver's seat, steering wheel or
mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirrors and fasten your seat
belt before starting the engine. Observe the following when adjusting steering
wheel
:, seat belt ;and driver's seat =:
R You are as far away from the driver's airbag as
possible.
R You are sitting in an upright position.
R Your thighs are slightly supported by the seat
cushion.
R Your legs are not entirely stretched and you
can depress the pedals properly.
R The back of your head is supported at eye
level by the centre of the head restraint.
R You can hold the steering wheel with your
arms slightly bent.
R You can move your legs freely.
R You can see all the displays in the instrument
cluster clearly. R
You have a good overview of traffic condi-
tions.
R The seat belt is pulled snugly against the body
and must be routed across the centre of your
shoulder and across your hips in the pelvic
area.
Further related subjects:
R Adjusting the seats mechanically and electri-
cally (Y page 102).
R Adjusting the seats electrically (Y page 102).
R Adjusting the steering wheel mechanically
(Y page 107).
R Adjusting the steering wheel electrically
(Y page 108).
R Fastening the seat belt correctly (Y page 46).
R Adjusting the rear-view mirror and exterior
mirrors (Y page 110).
R You can store the seat, steering wheel, exte-
rior mirror and head-up display settings with
the memory function (Y page 112). Seats
Important safety notes
G
WARNING
If children adjust the seats, they could
become trapped, especially if they are unat-
tended. There is a risk of injury.
When leaving the vehicle, always take the key with you and lock the vehicle. Never leave
children unattended in the vehicle.
The seats can still be adjusted when there is no
key in the ignition lock. G
WARNING
When adjusting a seat, you or another vehicle occupant could become trapped by the guiderail of the seat, for instance. There is a risk of
injury.
Make sure that no one has any part of their
body within the sweep of the seat when
adjusting it.
Observe the safety notes on "Airbags"
(Y page 48) and "Children in the vehicle"
(Y page 59). 100
SeatsSeats, steering wheel and
mirrors

The three red indicator lamps in the button indi-
cate the heating level you have selected.
The system automatically switches down from
level 3to level 2after approximately eight
minutes.
The system automatically switches down from
level 2to level 1after approximately ten
minutes.
The system automatically switches off approx-
imately 20 minutes after it is set to level 1.
X Turn the key to position 1or 2in the ignition
lock (Y page 133).
X To switch on: press button:repeatedly
until the desired heating level is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the vehicle battery voltage is too low, the
seat heating may switch off.
i If drive program Eis selected, the power of
the seat heating is reduced:
R Manual transmission (Y page 144)
R Automatic transmission (Y page 148) Switching the seat ventilation on/off
Switching on/off The blue indicator lamps in the button indicate
the ventilation level you have selected.
X Turn the key to position 1or 2in the ignition
lock (Y page 133).
X To switch on: press button:repeatedly
until the desired ventilation level is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the vehicle battery voltage is too low, the
seat ventilation may switch off.
i You can open the side windows and the soft
top with the key (Y page 95). The seat venti-
lation of the driver's seat automatically
switches to the highest level.
i When the vehicle is stationary, the fan
speed can be reduced automatically. This
reduces the noise of the seat ventilation. Problems with the seat heating / seat ventilation
Problem
Possible causes/consequences and
M MSolutions The seat heating or seat
ventilation has switched
off prematurely or can-
not be switched on. The on-board voltage is too low because too many electrical consum-
ers are switched on.
X Switch off electrical consumers that you do not need, such as the
rear window heating or interior lighting.
Once the battery is sufficiently charged, the seat heating or seat
ventilation can be switched back on manually. 106
SeatsSeats, steering wheel and mirrors