2016 MERCEDES-BENZ C CLASS key

Defrosting th e windows
Windows fogged up on th e insideX
Activat e th e "Coolin g wit h air dehumidifica-
tion " function wit h th e Z rocker switch .X
Switc h on automatic mode usin g th e X
rocker switch .X
If th e windows continue to fo g up, activat e th e
"Windshield defrosting" function usin g th e
d rocker switch .
i You should only selec t this setting until th e
windshield is clear again .
Windows fogged up on th e outsid eX
Activat e th e windshield wipers .X
Switc h on automatic mode usin g th e X
rocker switch .
i If you clean th e windows regularly, they do
no t fo g up so quickly.
Rea r window defroster
General notes The rea r window defroster has a hig h curren t
draw. You should therefore switch it of f as soo n
as th e rea r window is clear . Otherwise , th e rea r
window defroster switches of f automatically
after severa l minutes.
If th e battery voltage is to o low, th e rea r window
defroster may switch off.
Switchin g on/of fX
Tur n th e SmartKey to position 2 in th e ignition
loc k ( Y
page 146).X
Press th e l rocker switch up or down .
The indicator lamp abov e th e l rocker
switch lights up or goe s out .136
Operating the climate control systems
Climate control

Problems with the rear window defroster Problem
Possible causes/consequences and P Solutions
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The battery has not been sufficiently charged. X
Switch off any consumers that are not required, e.g. reading lamps,
interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window defroster
can be activated again.
Switching air-recirculation mode
on/off
General notes You can also temporarily deactivate the flow of
fresh air manually if unpleasant odors are enter-
ing the vehicle from outside. The air already
inside the vehicle will then be recirculated.
If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Switching on/off X
Turn the SmartKey to position 2 in the ignition
lock ( Y
page 146).X
To activate: press the r rocker switch up
or down.
The indicator lamp above the r rocker
switch lights up.
Air-recirculation mode switches on automati-
cally: R
at high outside temperatures R
at high levels of pollution (3-zone automatic
climate control only) R
in a tunnel (vehicles with a navigation system
only)
The indicator lamp above the r rocker
switch is not lit when automatic air-recirculation
mode is activated. Outside air is added after
about 30 minutes. X
To deactivate: press the r rocker switch
up or down.
The indicator lamp above the r rocker
switch goes out. Air-recirculation mode deactivates automati-
cally: R
after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †) R
after approximately five minutes if cooling
with air dehumidification is deactivated R
after approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated
Switching the residual heat on or off
General notes The residual heat function is only available with
3-zone automatic climate control on vehicles for
Canada.
Once the engine is switched off, it is possible to
make use of the residual heat of the engine to
continue heating or ventilating the front com-
partment of the vehicle for approximately
30 minutes. The heating or ventilation time
depends on the interior temperature that has
been set.
Switching on/off X
Turn the SmartKey to position 0 in the ignition
lock or remove it ( Y
page 146).X
To switch on: press the ! rocker switch
up or down.
The indicator lamp above the ! rocker
switch lights up.
The blower will run at a low speed regardless of
the airflow setting.
If you activate the residual heat function at high
temperatures, only the ventilation will be acti-
vated. The blower runs at medium speed.Operating the climate control systems 137
Climate control

Pre-entry climate control via SmartKey
General notes The "Pre-entry climate control via SmartKey" function is only available in PLUG-IN HYBRID vehicles.
Before getting in, the driver's seat area or the whole interior can be briefly warmed or ventilated in
advance with the air from the air vents being pre-cooled.
The high-voltage battery must be sufficiently charged before "Pre-entry climate control via Smart-
Key" can be activated.
When the vehicle is pre-cooled, the following functions are activated if required: R
Climate control system R
Blower R
Seat ventilation
When the vehicle is pre-heated, the following functions are activated if required: R
Climate control system R
Blower R
Seat heating R
Steering wheel heating R
Exterior mirror heating R
Rear window defroster
If you have switched on the perfume atomizer or ionization using the multimedia system, these will
be activated together with pre-entry climate control.
Activate the perfume atomizer ( Y
page 303).
Activate ionization ( Y
page 303).
Activating or deactivating "Pre-entry climate control via SmartKey" Before "Pre-entry climate control via SmartKey" can be activated, you must activate the function via
the multimedia system ( Y
page 303).X
To activate pre-entry climate control via SmartKey: unlock the vehicle with the SmartKey or
KEYLESS-GO.
The climate control functions are activated for up to 5 minutes for pre-heating and pre-cooling.
To deactivate "Pre-entry climate control via SmartKey": "Pre-entry climate control via Smart-
Key" switches off automatically when the engine is started.
The following functions remain active after the engine is started: R
Seat heating (heating) R
Seat ventilation (ventilation) R
Perfume atomizer R
Ionization
An activated "Pre-entry climate control via SmartKey" function can be deactivated using the rocker
switch ( Y
page 143). Operating the climate control systems 141
Climate control Z

Problems with "Pre-entry climate control via SmartKey" Problem
Possible causes/consequences and P Solutions
"Pre-entry climate con-
trol via SmartKey" can-
not be switched on or
has switched itself off. The condition of charge of the high-voltage battery is under the speci-
fied minimum condition of charge. X
Start the engine when the vehicle is at a standstill.
The engine powers the electric motor. The electric motor operates
as a generator. The high-voltage battery is being charged.
Further information on charging the high-voltage battery via: R
a mains socket ( Y
page 171)R
a charging station ( Y
page 174)R
a wallbox ( Y
page 173)
"Pre-entry climate control via SmartKey" has been started more than
twice with the engine switched off. X
Switch on the engine and let it run for more than ten seconds. X
Try again to switch on "Pre-entry climate control via SmartKey".
Pre-entry climate control at time of
departure
Important safety notes
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.
General notes The "Pre-entry climate control at departure
time" function is only available in PLUG-IN
HYBRID vehicles.
You can use the "Pre-entry climate control at
departure time" function to cool or heat the
vehicle interior if the engine is not running.
The "Pre-entry climate control at departure
time" function can be activated regardless of
whether or not the vehicle is connected to an
electric power supply. The condition of charge of
the high-voltage battery must be higher than the
specified minimum condition of charge, how-
ever.
When the vehicle is connected to an electric
power supply, priority is given to charging the
high-voltage battery to the specified minimum charge. "Pre-entry climate control at departure
time" is only activated subsequently.
The running time of the "Pre-entry climate con-
trol at departure time" function may be reduced
if: R
the vehicle is not connected to an electric
power supply and R
the high-voltage battery is not fully charged
With active "Pre-entry climate control at depar-
ture time" the condition of charge of the high-
voltage battery can be reduced, even if the
charge cable connector is connected.
When the vehicle is cooled, the following func-
tions are activated if required: R
Climate control system R
Blower R
Seat ventilation
When the vehicle is heated, the following func-
tions are activated if required: R
Climate control system R
Blower R
Seat heating R
Steering wheel heating R
Exterior mirror heating R
Rear window defroster
If you have switched on the perfume atomizer or
the ionization using the multimedia system,
these will be activated together with the "Pre-
entry climate control at departure time".142
Operating the climate control systems
Climate control

G WARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect,
for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
G WARNING
If the parking brake has not been fully
released when driving, the parking brake can: R
overheat and cause a fire R
lose its hold function.
There is a risk of fire and an accident. Release
the parking brake fully before driving off.
! Do not warm up the engine with the vehicle
stationary. Drive off immediately. Avoid high
engine speeds and driving at full throttle until
the engine has reached its operating temper-
ature.
Only shift the automatic transmission to the
desired drive position when the vehicle is sta-
tionary.
Where possible, avoid spinning the drive
wheels when pulling away on slippery roads.
You could otherwise damage the drive train.
! Mercedes-AMG vehicles: at low engine oil
temperatures below 68 ‡ (+20 †), the max-
imum engine speed is restricted in order to
protect the engine. To protect the engine and
maintain smooth engine operation, avoid driv-
ing at full throttle when the engine is cold.
Observe the important safety notes for PLUG-IN
HYBRID vehicles ( Y
page 44). SmartKey positions
SmartKey
Z
To remove the SmartKey G
Power supply for some consumers, such as
the windshield wipers H
Ignition (power supply for all consumers)
and drive position I
To start the engine
i The SmartKey can be turned in the ignition
lock even if it is not the correct SmartKey for
the vehicle. The ignition is not switched on.
The engine cannot be started.
Vehicles with AIRPANEL: you can open the
shutters in the radiator trim by turning the
SmartKey to position 2 in the ignition lock. After
approximately 120 seconds the shutters open
automatically. Further information on opening
and cleaning the shutters ( Y
page 339).
Start/Stop button
General notes
When you insert the Start/Stop button into the
ignition lock, the system needs approximately
two seconds recognition time. You can then use
the Start/Stop button.
Pressing the Start/Stop button several times in
succession corresponds to the different key
positions in the ignition lock. This is only the
case if you are not depressing the brake pedal.
If you depress the brake pedal and press the
Start/Stop button, the engine starts immedi-
ately.
A check which periodically establishes a radio
connection between the vehicle and the Smart-
Key determines whether a valid SmartKey is in
the vehicle. This occurs, for example, when
starting the engine.146
Driving
Driving and parking

To start the vehicle without actively using the
SmartKey: R
the Start/Stop button must be inserted in the
ignition lock. R
the SmartKey must be in the vehicle. R
the vehicle must not be locked with the
SmartKey or KEYLESS-GO ( Y
page 82).
Do not keep the SmartKey: R
with electronic devices, e.g. a mobile phone
or another SmartKey. R
with metallic objects, e.g. coins or metal foil. R
inside metallic objects, e.g. a metal case.
This can affect the functionality of the Smart-
Key.
If you lock the vehicle with the SmartKey's
remote control or with KEYLESS-GO, after a
short time: R
you will not be able to switch on the ignition
with the Start/Stop button. R
you will not be able to start the engine with the
Start/Stop button until the vehicle is
unlocked again.
If you lock the vehicle centrally using the button
on the front door ( Y
page 88), you can continue
to start the engine with the Start/Stop button.
The engine can be switched off while the vehicle
is in motion by pressing and holding the Start/
Stop button for three seconds. This function
operates independently of the ECO start/stop
automatic engine switch-off function.
Key positions with the Start/Stop button
C
Start/Stop button
D
Ignition lock
As soon as the ignition is switched on, all the
indicator lamps in the instrument cluster light
up. Further information on situations where an
indicator lamp either fails to go out after starting the engine or lights up while driving
( Y
page 288).
If Start/Stop button C has not yet been
pressed, this corresponds to the SmartKey
being removed from the ignition. X
To switch on the power supply: press
Start/Stop button C once.
The power supply is switched on. You can now
activate the windshield wipers, for example.
The power supply is switched off again if: R
the driver's door is opened and R
you press Start/Stop button C twice when in
this position X
To switch on the ignition: press Start/Stop
button C twice.
The ignition is switched on.
The ignition is switched off again if: R
you do not start the engine from this position
within 15 minutes R
you press Start/Stop button C twice when in
this position
The power supply is switched off again if: R
the driver's door is opened and R
you press Start/Stop button C twice when in
this position
Removing the Start/Stop button You can remove the Start/Stop button from the
ignition lock and start the vehicle as normal
using the SmartKey.
It is only possible to switch between Start/Stop
button mode and SmartKey operation when the
transmission is in position P .X
Remove Start/Stop button C from ignition
lock D .
You do not have to remove the Start/Stop but-
ton from the ignition lock when you leave the
vehicle. You should, however, always take the
SmartKey with you when leaving the vehicle. As
long as the SmartKey is in the vehicle: R
the vehicle can be started using the Start/
Stop button R
the electrically powered equipment can be
operated Driving 147
Driving and parking Z

Starting the engine
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.
G WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases leads to poisoning. There
is a risk of fatal injury. Therefore never leave
the engine running in enclosed spaces with-
out sufficient ventilation.
G WARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system or
parts of the engine that heat up. There is a risk
of fire.
Carry out regular checks to make sure that
there are no flammable foreign materials in
the engine compartment or in the exhaust
system.
! Do not depress the accelerator when start-
ing the engine. General notes The catalytic converter is preheated for up to
30 seconds after a cold start. The sound of the
engine may change during this time.
Automatic transmission X
Shift the transmission to position P
( Y
page 156).
The transmission position display in the mul-
tifunction display shows P ( Y
page 157).
i You can start the engine in transmission
position P and N .
Starting procedure with the SmartKey To start the engine using the SmartKey instead
of the Start/Stop button, pull the Start/Stop
button out of the ignition lock. X
Turn the SmartKey to position 3 in the ignition
lock and release it as soon as the engine is
running ( Y
page 146).
If the engine will not start: X
Remove the SmartKey from the ignition lock. X
Reinsert the SmartKey into the ignition lock
after a short waiting period. X
Turn the SmartKey to position 2 in the ignition
lock ( Y
page 146).
The indicator lamps in the instrument cluster
light up ( Y
page 286). X
Turn the SmartKey to position 3 in the ignition
lock ( Y
page 146) and release it as soon as the
engine is running.
Starting procedure with the Start/Stop
button The Start/Stop button is only available on vehi-
cles with KEYLESS-GO or the KEYLESS-GO start
function.
The Start/Stop button can be used to start the
vehicle manually without inserting the SmartKey
into the ignition lock. The Start/Stop button
must be inserted in the ignition lock and the
SmartKey must be in the vehicle. This mode for
starting the engine operates independently of
the ECO start/stop automatic engine start func-
tion.
You can start the engine if a valid SmartKey is in
the vehicle. Switch off the engine and always
take the SmartKey with you when leaving the148
Driving
Driving and parking

vehicle, even if you only leave it for a short time.
Pay attention to the important safety notes. X
Depress the brake pedal and keep it
depressed. X
Press the Start/Stop button once
( Y
page 146).
The engine starts.
Starting procedure via smartphone Observe the important safety notes on starting
the engine ( Y
page 148).
You can also start your engine via your smart-
phone from outside the vehicle. In this case, the
previously selected climate control setting is
activated. In this way you can cool or heat the
interior of the vehicle before starting the jour-
ney.
Only start the engine via your smartphone if it is
safe to start and run the engine where your vehi-
cle is parked.
Observe the legal stipulations in the area where
your vehicle is parked. Engine start via smart-
phone may be limited to certain countries or
regions.
You can execute a maximum of two consecutive
starting attempts via your smartphone. If you
insert the SmartKey into the ignition lock, you
can carry out two more starting attempts.
Once you have started the engine, you can
switch the engine off via your smartphone at any
time.
You can only start the engine via your smart-
phone if: R
the SmartKey is in the ignition lock R
park position P is selectedR
the accelerator pedal is not depressed R
the anti-theft alarm system is not activated R
the panic alarm is not activated R
the hazard warning lamps are switched off R
the hood is closed. R
the doors are closed and locked R
the windows and sliding sunroof are closed
Also make sure that: R
the fuel tank is sufficiently filled R
the starter battery is sufficiently charged
G WARNING
Limbs could be crushed or trapped if the
engine is started unintentionally during ser- vice or maintenance work. There is a risk of
injury.
Always secure the engine against uninten-
tional starting before carrying out mainte-
nance or repair work.
Make sure that the engine cannot be started via
your smartphone before carrying out mainte-
nance or repairs. You can prevent an engine
start via your smartphone, for example, if you: R
switch on the hazard warning lamps R
do not lock the doors R
open the hood.
Pulling away
General notes
G WARNING
If the engine speed is above the idling speed
and you engage transmission position D or R ,
the vehicle could pull away suddenly. There is
a risk of an accident.
When engaging transmission position D or R ,
always firmly depress the brake pedal and do
not simultaneously accelerate.
Depress the accelerator carefully when pulling
away.
The vehicle locks centrally once you have pulled
away. The locking knobs in the doors drop down.
You can open the doors from the inside at any
time.
You can also deactivate the automatic locking
feature, see the Digital Operator's Manual.
It is only possible to shift the transmission from
position P to the desired position if you depress
the brake pedal. Only then is the parking lock
released. If you do not depress the brake pedal,
the DIRECT SELECT lever can still be moved but
the parking lock remains engaged.
i Upshifts take place at higher engine speeds
after a cold start. This helps the catalytic con-
verter to reach its operating temperature
more quickly.
Information on the automatic release of the
electric parking brake ( Y
page 178).Driving 149
Driving and parking Z