service MERCEDES-BENZ C-CLASS SALOON 2014 Owner's Manual

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variations are pos- sible. Note that your vehicle may not be
equipped with all of the functions descri-
bed. This is also the case for systems and
functions relevant to safety.
i Read the information on qualified special-
ist workshops: (Y page 27). Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could other-
wise mist up.
To prevent the windows from misting up:
R switch off climate control only briefly
R switch on air-recirculation mode only
briefly
R switch on the cooling with air dehumidifi-
cation function
R switch on the "demist windscreen" function
briefly, if required
Climate control regulates the temperature
and air humidity in the vehicle interior. The
interior filter cleans the air, thus improving
the interior climate.
For vehicles without hybrid drive, the "Cooling with air dehumidification" function is availa-
ble when the engine is running. For hybrid
vehicles, the cooling with air dehumidification function is also available via the electric
refrigerant compressor when the engine is
not running. Optimum climate control is only
achieved with the side windows and roof
closed.
The residual heat function can only be acti-
vated or deactivated with the ignition
switched off (Y page 166). i
Ventilate the vehicle for a brief period
during warm weather, e.g. using the con-
venience opening feature (Y page 107).
This will speed up the cooling process and
the desired interior temperature will be
reached more quickly.
i The integrated filter filters out most par-
ticles of dust and soot and completely fil-
ters out pollen. It also reduces gaseous pol-
lutants and odours. A clogged filter reduces
the amount of air supplied to the vehicle
interior. For this reason, you should always observe the interval for replacing the filter,which is specified in the Service Booklet. As this depends on environmental conditions,
e.g. heavy air pollution, the interval may be
shorter than stated in the Service Booklet.
i It is possible that the blower may be acti-
vated automatically 60 minutes after the
key has been removed depending on vari-
ous factors, e.g. the outside temperature.
The vehicle is then ventilated for
30 minutes to dry the automatic climate
control. 150
Overview of climate control systemsClimate control

Problem
Possible causes/consequences and
M
MSolutions The fuel filler flap can-
not be opened. The fuel filler flap is not unlocked.
or
The key battery is discharged.
X Unlock the vehicle (Y page 91).
or
X Unlock the vehicle using the emergency key element
(Y page 93). The fuel filler flap is unlocked, but the opening mechanism is jam-
med.
X Consult a qualified specialist workshop. AdBlue
®
(BlueTEC vehicles only)
Important notes on use To function properly, BlueTEC exhaust gas
aftertreatment must be operated with the
reducing agent AdBlue ®
. Topping up AdBlue ®
is part of the maintenance work.
When the supply of AdBlue ®
is down to
approximately 3.0 litres, the Refill
Refill
AdBlue See Owner's Manual AdBlue See Owner's Manual message is
shown in the multifunction display.
When the AdBlue ®
supply drops to a mini-
mum, the Refill
Refill AdBlue
AdBlueNo
No start
start in
inX
X
km
km message is shown in the multifunction dis-
play.
If you drive the vehicle faster than 15 km/h,
the Refill AdBlue See Owner's Manual Refill AdBlue See Owner's Manual
message goes out after approximately one
minute.
If the Refill AdBlue No start in X km Refill AdBlue No start in X km
message is shown in the multifunction dis-
play, you can still drive the vehicle over the
distance shown. If the AdBlue ®
is not topped
up, you will subsequently be unable to
start the engine. If the Refill AdBlue
Refill AdBlue
Start not possible
Start not possible message appears in
the multifunction display and the engine does
not start, you must top up AdBlue ®
. X
Add at least 3.5 l of AdBlue ®
.
X Switch on the ignition for at least 60 sec-
onds.
X Start the engine.
i You can also have the AdBlue ®
tank refil-
led at a qualified specialist workshop.
Before driving your vehicle outside Europe,
have the AdBlue ®
supply checked at a quali-
fied specialist workshop.
Further information about BlueTEC exhaust
gas aftertreatment and about AdBlue ®
can
be obtained from any Mercedes-Benz Service Centre.
Important notes on the refilling proce-
dure AdBlue
®
is a water-soluble fluid for the
exhaust gas aftertreatment of diesel engines. It is:
R non-toxic
R colourless and odourless
R non-flammable
If you open the AdBlue ®
tank, small amounts
of ammonia vapour may be released.
Ammonia vapours have a pungent odour and
are particularly irritating to the skin, to
mucous membranes and to the eyes. You may experience a burning sensation in your eyes, 204
RefuellingDriving and parking

X
Switch the ignition off.
X Press the fuel filler flap in the direction of
arrow :.
The fuel filler flap swings up.
X Turn blue AdBlue ®
filler cap ;anti-clock-
wise and remove it.
AdBlue ®
filler cap ;is secured with a plas-
tic strip.
i The fuel filler flap is unlocked or locked
automatically when you unlock or lock the
vehicle.
AdBlue ®
refill canisters !
Do not tighten the disposable hose with
too much force. The disposable hose may
otherwise be destroyed. X
Unscrew the cap from the opening on top of
AdBlue ®
refill canister ;.
X Place disposable hose :on the opening of
AdBlue ®
refill canister ;and screw it on
clockwise until hand-tight. Disposable hose
:remains closed until
you fasten disposable hose :to the
AdBlue ®
filler neck of the vehicle.
X Place disposable hose :on the filler neck
on the vehicle and screw it on clockwise
until hand-tight. When you feel resistance,
disposable hose :is sufficiently secured.
X Lift up and tip AdBlue ®
refill canister ;.
Filling stops when the AdBlue ®
tank is com-
pletely filled. Do not fill the AdBlue ®
tank
any further. AdBlue ®
refill canister ;can
be removed when it has been only partially emptied.
X Turn disposable hose :on the filler neck
of the vehicle anti-clockwise and remove it.
X Turn disposable hose :on the opening of
AdBlue ®
refill canister ;anti-clockwise
and remove it.
X Reseal AdBlue ®
refill canister ;with the
cap.
AdBlue ®
refill canisters are available at many
filling stations or at a Mercedes-Benz Service
Centre. AdBlue ®
refill canisters are often sold
with a filler hose. A filler hose that does not
exactly fit the vehicle's AdBlue ®
tank offers
no protection against overfilling. AdBlue ®
may leak out as a result of overfilling.
Mercedes-Benz offers a special disposable
hose with overfill protection. You can obtain
this from any Mercedes-Benz Service Centre.
AdBlue ®
is available in a variety of containers
and receptacles. Only use the disposable
hose with the Mercedes-Benz AdBlue ®
refill
canisters.
AdBlue ®
refill bottle !
Screw on the AdBlue ®
refill bottle only
hand-tight. It may otherwise be destroyed. 206
RefuellingDriving and parking

X
Unscrew the protective cap from AdBlue ®
refill bottle :.
X Place AdBlue ®
refill bottle :on the filler
neck as shown and screw it on hand-tight.
X Press AdBlue ®
refill bottle :towards the
filler neck.
The AdBlue ®
tank is filled. This could last up
to one minute.
When AdBlue ®
refill bottle :is no longer
pressed, filling stops and the bottle may be
taken off again after being only partially
emptied.
X Release AdBlue ®
refill bottle :.
X Turn AdBlue ®
refill bottle :anti-clockwise
and remove it.
X Screw the protective cap onto AdBlue ®
refill bottle :again.
AdBlue ®
refill bottles are available at many
filling stations or at a Mercedes-Benz Service
Centre. Refill bottles without a threaded seal offer no protection against overfilling.
AdBlue ®
may leak out as a result of overfilling.
Mercedes-Benz offers special refill bottles
with a threaded cap. These are available at
any Mercedes-Benz Service Centre. Closing the AdBlue
®
filler cap Example: Saloon
X Fit AdBlue ®
filler cap ;on the filler neck
and turn it clockwise.
X To close the fuel filler flap, press it in the
direction of arrow :.
X Drive faster than 15 km/h.
The Refill AdBlue See Owner's Man‐ Refill AdBlue See Owner's Man‐
ual
ual message goes out after approximately
one minute.
If the Refill
Refill AdBlue
AdBlueSee
SeeOwner's
Owner's Manual
Manual
message continues to be shown in the multi-
function display, you must top up with more
AdBlue ®
. Parking
Important safety notes
G
WARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with hot parts of the exhaust system or exhaust
gas flow. There is a risk of fire.
Park the vehicle so that no flammable mate-
rial can come into contact with hot vehicle
components. In particular, do not park on dry grassland or harvested grain fields. 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 Parking
207Driving and parking
Z

Emergency braking
The vehicle can also be braked during an
emergency by using the electric parking
brake.
X While driving, push handle :of the elec-
trical parking brake (Y page 209).
The vehicle is braked as long as you keep
handle :of the electric parking brake
depressed. The longer the electric parking
brake handle :is depressed, the greater the
braking force.
During braking:
R a warning tone sounds
R the Release park. brake
Release park. brake message
appears
R the red !indicator lamp in the instru-
ment cluster flashes
When the vehicle has been braked to a stand- still, the electric parking brake is applied. Parking up the vehicle
If you leave the vehicle parked up for longer
than four weeks, the battery may be damaged by exhaustive discharging and further dam-
aged in the event of this occurring again.
X Disconnect the battery or connect it to a
trickle charger.
i You can obtain information about trickle
chargers from a qualified specialist work-
shop.
If you leave the vehicle parked up for longer
than six weeks, it may suffer from lack of use.
X Visit a qualified specialist workshop and
seek advice.
Hybrid vehicles: observe the safety notes
for the high-voltage battery (Y page 269). Driving tips
General driving tips
Important safety notes 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.
Drive sensibly – save fuel Observe the following tips to save fuel:
X The tyres should always be inflated to the
recommended tyre pressure.
X Remove unnecessary loads.
X Remove roof racks when they are not nee-
ded.
X Warm up the engine at low engine speeds.
X Avoid frequent acceleration or braking.
X Have all maintenance work carried out as
indicated by the service intervals in the
Service Booklet or by the service interval
display.
Fuel consumption also increases when driv-
ing in cold weather, in stop-start traffic, on
short journeys and in hilly terrain. ECO display
The ECO display shows you how economical
your driving style is. The ECO display assists
you in achieving the most economical driving
style for the selected settings and prevailing
conditions. Consumption can be significantly influenced by your driving style. Driving tips
211Driving and parking Z

Road and traffic conditions
i
The following function is only available in
vehicles with the Driving Assistance Plus
package.
The function is not operational in all coun-
tries.
DISTRONIC PLUS uses additional information
from your navigation system so that it can
adapt to certain traffic situations. This is the
case if, while following a vehicle, DISTRONIC
PLUS is active and you:
R approach or drive around a roundabout
R approach a T-junction
R turn off at a motorway exit
Even if the vehicle in front leaves the detec-
tion range, DISTRONIC PLUS temporarily
maintains the current driving speed and does not accelerate. This is based on the current
map data in the navigation system.
Afterwards, the vehicle accelerates back to
the speed you set.
The system takes into account the fact that
overtaking on the right is not permitted on
motorways or high-speed major roads at
speeds above 80 km/h. The driving speed is
adjusted to the speed of the queue of vehicles
in the adjacent lane to the left.
i Prevention of overtaking on the right
applies to countries where traffic drives on
the right. In countries where traffic drives
on the left, overtaking on the left is preven-
ted accordingly. Stopping G
WARNING
When leaving the vehicle, even if it is braked
only by DISTRONIC PLUS, it could roll away if:
R there is a malfunction in the system or in
the voltage supply.
R DISTRONIC PLUS has been deactivated
with the cruise control lever, e.g. by a vehi-
cle occupant or from outside the vehicle.
R the electrical system in the engine com-
partment, the battery or the fuses have
been tampered with.
R the battery is disconnected.
R the accelerator pedal has been depressed,
e.g. by a vehicle occupant.
There is a risk of an accident.
If you wish to exit the vehicle, always turn off
DISTRONIC PLUS and secure the vehicle
against rolling away.
For further information on deactivating
DISTRONIC PLUS (Y page 228).
If DISTRONIC PLUS detects that the vehicle in front is stopping, it brakes your vehicle until it is stationary.
Once your vehicle is stationary, it remains
stationary and you do not need to depress the
brake.
After a short period, the vehicle is secured by
the electric parking brake, thus relieving the
service brake.
Depending on the specified minimum dis-
tance, your vehicle will come to a standstill at a sufficient distance behind the vehicle in
front. The specified minimum distance is set
using the control on the cruise control lever.
The electric parking brake secures the vehicle
automatically if DISTRONIC PLUS is activated
and:
R the seat belt is unfastened and the driver's
door is open
R the engine is switched off, unless it is auto-
matically switched off by the ECO start/
stop function 226
Driving systemsDriving and parking

Important safety notes
G
WARNING
When leaving the vehicle, it can still roll away despite being braked by the HOLD function if:
R there is a malfunction in the system or in
the voltage supply
R the HOLD function is deactivated by the
accelerator pedal being depressed, e.g. by
a vehicle occupant
R the electrical system in the engine com-
partment, the battery or the fuses are tam-
pered with
R the battery is disconnected
There is a risk of an accident.
Before leaving the vehicle, always deactivate
the HOLD function and secure the vehicle
from rolling away.
! If DISTRONIC PLUS or the HOLD function
is activated, the vehicle brakes automati-
cally in certain situations. To prevent dam-
age to the vehicle, deactivate DISTRONIC
PLUS and the HOLD function in the follow-
ing or other similar situations:
R when towing the vehicle
R in the car wash
Activation conditions You can activate the HOLD function if all of
the following conditions are fulfilled:
R the vehicle is stationary
R the engine is running or if it has been auto-
matically switched off by the ECO start/
stop function
R the driver's door is closed or your seat belt
is fastened
R the electric parking brake is released
R Vehicles with automatic transmission: the
transmission is in position D,Ror N
R DISTRONIC PLUS is deactivated Activating the HOLD function
X
Make sure that the activation conditions
are met.
X Depress the brake pedal.
X Quickly depress the brake pedal further
until :appears in the multifunction dis-
play.
The HOLD function is activated. You can
release the brake pedal.
i If depressing the brake pedal the first
time does not activate the HOLD function,
wait briefly and then try again.
Deactivating the HOLD function The HOLD function is deactivated automati-
cally if:
R you accelerate. On vehicles with automatic
transmission: only when the transmission
is in position Dor R.
R the transmission is in position Pon vehicles
with automatic transmission.
R you depress the brake pedal again with a
certain amount of pressure until :disap-
pears from the multifunction display.
R you secure the vehicle using the electric
parking brake.
R you activate DISTRONIC PLUS.
i After a short period, the vehicle is secured
by the electric parking brake, thus relieving
the service brake. The HOLD function is
then deactivated. Driving systems
233Driving and parking Z

played in a bar display in five levels from
high to low
R If ATTENTION ASSIST is unable to calculate
the attention level and cannot output a
warning, the System suspended
System suspendedmessage
appears. The bar display then changes the
display, e.g. if you are driving at a speed
below 60 km/h or above 200 km/h.
Activating ATTENTION ASSIST X
Activate ATTENTION ASSIST using the on-
board computer (Y page 309).
The system determines the attention level
of the driver depending on the setting
selected:
Selection Standard Standard: the sensitivity with
which the system determines the attention
level is set to normal.
Selection Sensitive Sensitive: the sensitivity is set
higher. The attention level detected by Atten- tion Assist is adapted accordingly and the
driver is warned earlier.
When ATTENTION ASSIST is deactivated, the é symbol appears in the multifunction
display in the assistance graphic display.
When ATTENTION ASSIST has been deactiva-
ted, it is automatically reactivated after the
engine has been stopped. The sensitivity
selected corresponds to the last selection
activated (standard/sensitive).
Warning in the multifunction display If fatigue or increasing lapses in concentra-
tion are detected, a warning appears in the
multifunction display: ATTENTION ASSIST ATTENTION ASSIST
Take a break!
Take a break! .
In addition to the message shown in the mul-
tifunction display, you will then hear a warn-
ing tone.
X If necessary, take a break.
X Confirm the message by pressing the a
button on the steering wheel.
On long journeys, take regular breaks in good
time to allow yourself to rest properly. If you do not take a break and ATTENTION ASSIST
still detects increasing lapses in concentra-
tion, you will be warned again after
15 minutes at the earliest. This will only hap-
pen if ATTENTION ASSIST still detects typical indicators of fatigue or increasing lapses in
concentration.
If a warning is output in the multifunction dis-
play, a service station search is performed in
COMAND. You can select a service station
and navigation to this service station will then
begin. This function can be activated and
deactivated in COMAND. Traffic Sign Assist
General notes Traffic Sign Assist displays the maximum
speed permitted and overtaking restrictions
to the driver in the instrument cluster. Driving onto a section of road in the wrong direction
triggers a warning. Traffic Sign Assist detects traffic signs with camera system :attached
behind the top of the windscreen. The data
and general traffic regulations stored in the
navigation system are also used to determine
the current speed limit.
If a traffic sign that is relevant to your vehicle is passed, the display of the speed limits and
overtaking restrictions is updated. 256
Driving systemsDriving and parking

Instrument cluster
:
Charge level display for high-voltage battery (Y page 273)
; RBS warning lamp (Y page 362)
= Electric motor power display (Y page 272)Displays and operation
Coolant temperature display for a com- bustion engine You can call up the coolant temperature using
the on-board computer.
X Use Ñ on the steering wheel to call up
the list of menus.
X Press the :or9 button on the steer-
ing wheel to select the Service
Servicemenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select
Coolant
Coolant. Electric motor power display The electric motor power display is on the
right-hand side of the instrument cluster.
The current charge level of the high-voltage
battery is shown as a percentage in charge
level display
A. 100% corresponds to the
highest possible charge level of the high-volt- age battery.
There are two further areas located to the left
and right of charge level display A:
R Area :to; (E-DRIVE): 272
Hybrid operationDriving and pa
rking

Acceleration
Depending on the operating mode, pulling
away and driving under low load conditions
are performed:
R entirely by electric propulsion
R in combination with the internal combus-
tion engine
When accelerating at an increased or full
load, boost mode is utilised. The electric
motor supports the internal combustion
engine by providing additional torque when
the accelerator is depressed rapidly.
Overrun mode or braking
There are three possible operating modes
when the hybrid vehicle is decelerating: R When coasting and decelerating, energy
recuperation is already taking place
(Y page 269). The electric motor functions
as an alternator and stores the recuperated
energy in the high-voltage battery.
R When braking gently, the electric motor
increases the deceleration of the vehicle.
Energy recuperation is increased
(Y page 269). The electric motor functions
as an alternator and stores the recuperated energy in the high-voltage battery.
R During heavy braking, the service brake is
also used to slow down the vehicle. Both
systems work together.
Driving in the city
Energy is recuperated during frequent decel-
eration and stopping in city traffic.
The vehicle can be driven by the electric
motor alone up to a speed of approximately
35 km/h, e.g.:
R while approaching a traffic light
R in stop-and-start traffic
The vehicle is driven by the electric motor
alone only when all conditions for the auto-
matic engine switch-off are fulfilled.
Further information on the automatic engine
switch-off (Y page 280). Driving on inter-urban roads
Three phases are possible when driving on
inter-urban roads:
R rapid acceleration (boost mode)
R constant energy consumption
R energy recuperation
Depending on the characteristics of the
route, there may be a lot of recuperated
energy available. This reduces consumption
and emissions.
Driving on the motorway
When driving on a motorway, the following
have a particularly positive effect on fuel con- sumption and emissions:
R the decrease in wasted power when using
recuperative braking
R the decrease in wasted power in overrun
mode when the combustion engine is
switched off
Manoeuvring and turning
The hybrid drive makes it possible to manoeu- vre and turn solely using the electric motor.
ECO start/stop function General notes
The ECO start/stop function switches the
internal combustion engine off automatically
when the vehicle stops moving and at high
speeds (Y page 280).
All vehicle systems remain active, e.g. the
automatic climate control.
The ECO start/stop function is only available in drive programs C,Eand I. Electric-only
operation is only possible in drive programs C
and E. Hybrid operation
279Driving and parking Z