2014 MERCEDES-BENZ CLA maintenance

Useful information
iThis Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
iRead the information on qualified
specialist workshops: (Ypage 25).
Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could
otherwise fog up.
To preventthe windows from fogging up:
Rswitch off climate control only briefly
Rswitch on air-recirculation mode only
briefly
Rswitch on the cooling with air
dehumidification function
Rswitch on the defrost windshield function
briefly, if required
The automatic climate control regulates the
temperature and the humidity of the vehicle
interior and filters out undesirable
substances from the air.
Automatic climate control/dual-zone
automatic climate control is only operational
when the engine is running. Optimum
operation is only achieved with the side
windows and panorama roof with power tilt/
sliding panel closed.
The residual heat function can only be
activated or deactivated with the ignition
switched off (Ypage 131).
iVentilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature (Ypage 84).
This will speed up the cooling process and
the desired vehicle interior temperature
will be reached more quickly.
iThe integrated filter filters out most
particles of dust and soot and completely
filters out pollen. With dual-zone automatic
climate control, gaseous pollutants and
odors will also be reduced.Aclogged filter
reduces the amountofair supplied to the
vehicle interior.For this reason, you should
always observe the interval for replacing
the filter, which is specified in the
Maintenance Booklet.As it depends on
environmental conditions, e.g. heavy air
pollution, the interval may be shorter than
stated in the Maintenance Booklet.
iIt is possible that the dehumidification
function of the climate control system may
be activated automatically an hour after the
SmartKey has been removed. The vehicle
is then ventilated for 30 minutes.
120Overview of climate control systems
Climate control

Drive sensibly–save fuel
Observe the following tips to save fuel:
RThe tires should always be inflated to the
recommended tire pressure.
RRemove unnecessary loads.
RRemove roof racks whenthey are not
needed.
RWarm up the engine at low engine speeds.
RAvoid frequent acceleration or braking.
RHave all maintenance work carried out as
indicated by the service intervals in the
Maintenance Booklet or by the service
interval display.
Fuel consumption also increases when
driving in cold weather, in stop-start traffic
and in hilly terrain.
Drinking and driving
GWARNING
Drinking and driving and/or taking drugs and
driving are very dangerous combinations.
Even a small amount of alcohol or drugs can
affect your reflexes, perceptions and
judgment.
The possibility of a serious or even fatal
accident is greatly increased when you drink
or take drugs and drive.
Do not drink or take drugs and drive or allow
anyone to drive who has been drinking or
taking drugs.
Emission control
GWARNING
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
without sufficient ventilation.
Certain engine systems are designed to keep
the level of poisonous components in exhaust
fumes within legal limits.
These systems only work at peak efficiency if
they are serviced exactly in accordance with
the manufacturer's specifications. For this
reason, only have work on the engine carried
out by qualified and authorized Mercedes-
Benz technicians.
The engine settings must not be changed
under any circumstances. Furthermore, all
specific service work must be carried out at
regular intervals and in accordance with the
Mercedes-Benzservice requirements. Details
can be found in the Maintenance Booklet.
ECO display
The ECO display gives you information on how
economical your driving style is. The ECO
display assists you in achieving the optimum
driving style in terms of consumption, taking
the actual and selected conditions into
consideration.Your driving style can
significantly influence the vehicle's
consumption.
Example: ECO display
The ECO display consists of three bars:
RAcceleration
RConstant
RCoasting
The percent value is the average value of the
three bars. The three bars and the mean value
begin at the value of 50%.Ahigher
percentage indicates a moreeconomical
driving style.
The ECO display does not indicate the actual
fuel consumption and a fixed percentage
count in the ECO display does not indicate a
fixed consumption figure.
Driving tips157
Driving and parking
Z

Heavy and light loads
GWARNING
If you rest yourfoot on the brake pedal while
driving, the braking system can overheat. This
increases the stopping distance and can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as a footrest.Never
depress the brake pedal and the accelerator
pedal at the same time.
!Depressing the brake pedal constantly
results in excessive and premature wear to
the brake pads.
If the brakes have been subjected to a heavy
load, do not stop the vehicle immediately.
Drive on for a short while. This allows the
airflow to cool the brakes more quickly.
Wet roads
If you have driven for a long time in heavy rain
without braking, there may be a delayed
reaction from the brakes when braking for the
first time. This may also occur after the
vehicle has been washed or driven through
deep water.
You have to depress the brake pedal more
firmly. Maintain a greater distance from the
vehicle in front.
After driving on a wet road or having the
vehicle washed, brake firmly while paying
attention to the traffic conditions. This will
warm up the brake discs, thereby drying them
more quickly and protecting them against
corrosion.
Limited braking performance on salt-
treated roads
If you drive on salted roads, a layer of salt
residue may form on the brake discs and
brake pads. This can result in a significantly
longer braking distance.
RBrake occasionally to remove any possible
salt residue. Make sure that you do not
endanger other road users when doing so.
RCarefully depress the brake pedal and the
beginning and end of a journey.
RMaintain a greater distanceto the vehicle
ahead.
Servicing the brakes
!If the red brake warning lamp lights up in
the instrument cluster and you hear a
warning tone while the engine is running,
the brake fluid level may be too low.
Observe additional warning messages in
the multifunction display.
The brake fluid level may be too low due to
brake pad wear or leaking brake lines.
Have the brake system checked
immediately. This work should be carried
out at a qualified specialist workshop.
!A function or performance test should
only be carried out ona2-axle
dynamometer. If you are planning to have
the vehicle tested on such a dynamometer,
contact an authorized Mercedes-Benz
Center to obtain further information first.
Otherwise, you could damage the drive
train or the brake system.
!As the ESP®system operates
automatically, the engine and the ignition
must be switched off (theSmartKey must
be in position0or1in the ignitionlock) if:
Rthe electric parking brake is tested on a
brake dynamometer (for a maximum of
ten seconds)
Rthe vehicle is towed with the front axle
raised.
Braking triggered automatically by ESP®
may seriously damage the brake system.
All checks and maintenance work on the
brake system must be carried out at a
qualified specialist workshop. Consult a
qualified specialist workshop to arrange this.
Driving tips159
Driving and parking
Z

multifunction display in the assistance
graphics display.
For further information about ATTENTION
ASSIST, see (Ypage 186).
Activating/deactivating Blind Spot
Assist
XPress theorbutton on the
steering wheel to select theDriveAssist
menu.
XPress theorbutton to select
Blind Spot Assist.
XPress thebutton.
The current selection is displayed.
XTo activate/deactivate:press the
button again.
For further information about Blind Spot
Assist, see (Ypage 188).
When theBlind Spot Assist: Sensors
Deactivatedmessage is shown, the radar
sensors are deactivated.
XSwitch on the radarsensor system
(Ypage 208).
Activating/deactivating Lane Keeping
Assist
XPress theorbutton on the
steering wheel to select theDriveAssist
menu.
XPressorto selectLane
Keeping Assist.
XPress thebutton.
The currentselection is displayed.
XPressto confirm.
XPress theorbutton to setOff,
StandardorAdaptive.
XPress thebutton to save the setting.
When Lane Keeping Assist is activated, the
multifunction display shows the lane
markings as bright lines in the assistance
graphic.
For further information about Lane Keeping
Assist, see (Ypage 190).
Maintenance menu
In theServicemenu, you have the following
options:
RCalling up display messages in message
memory (Ypage 212)
RChecking the tire pressure electronically
(Ypage 320)
Restarting the tire pressure loss warning
system (Canada only) (Ypage 319)
RCalling up the service due date
(Ypage 284)
Settings menu
Introduction
In theSettingsmenu, you have the following
options:
RChanging the instrument cluster settings
RChanging the light settings
RChanging the vehicle settings
RChanging the convenience settings
RRestoring the factory settings
Menus and submenus205
On-board computer and displays
Z

However, only the law enforcement agency
is informed of the location of the vehicle.
iIf the anti-theft alarm system is activated
for longer than 30 seconds,the Mercedes-
Benz Customer Assistance Center is
automatically informed.
Vehicle remote malfunction diagnosis
With the vehicle remote malfunction
diagnosis (Vehicle Health Check), the
Customer Assistance center can provide
improved support for problems with your
vehicle. During an existing call, vehicle data
is transferred to the Customer Assistance
center. The customer service representative
can use the received data to decide what kind
of assistance is required.You are then, for
example, guided to the nearest authorized
Mercedes-Benz Center or a recovery vehicle
is called.
If vehicle data needs to be transferred during
an MB Info call or a Roadside Assistance call,
this is initiated by the Customer Assistance
center. You will see theRoadside
Assistance Connectedmessage in the
COMAND display.Ifthe vehicle remote
malfunction diagnosis can be started, the
Request for vehicle diagnosis
received. Start vehicle diagnosis?
message appears in the display.
XConfirm the message withYes.
XWhen theVehicle Diagnosis Please
start ignitionmessage appears, turn
the SmartKey to position2in the ignition
lock (Ypage 137).
XWhen thePlease follow the
instructionsreceivedbyphoneand
move your vehicle to a safe
position.message appears, follow the
customer service representative's
instructions.
The message in the display disappears.
If you selectCancel, the vehicle remote
malfunction diagnosis is canceled
completely.
The vehicle operating state check begins.
You will see theVehicle diagnosis
activated.message.
When the diagnosis is completed, theSend
vehicle diagnostics data//(Voice
connection may be//interrupted
duringdatatransfer)message appears.
The vehicle data can now be sent to the
Customer Assistance center.
XPressOKto confirm the message.
The voice connection with the Customer
Assistance center is terminated.
You will see theVehicle Diagnosis:
Transferring data...message.
The vehicle data is sent to the Customer
Assistance center.
Depending on what the customer service
representative agreed with you, the voice
connection is re-established after the transfer
is complete. If necessary, you will be
contacted at a later time by another means,
e.g. by e-mail or phone.
Further functions of the vehicle remote
malfunction diagnosis include, for example:
Rtransfer of service data to the Customer
Assistance center. Ifaservice is overdue,
the COMAND display shows a message
about various special offers at your
workshop.
Rmonthly status information e-mail on oil
level, air pressure, maintenance, brakes,
etc.Ifapplicable, you will receive
information on special offers in the e-mail.
USA only: this information can also be
called up under "Owners Online" at http://
www.mbusa.com.
Information on the data stored in the vehicle
(Ypage 26).
Information on Roadside Assistance
(Ypage 23).
Features271
Stowage and features
Z

Useful information............................280
Engine compartment........................280
Maintenance......................................284
Care....................................................285
279
Maintenance and care

Useful information
iThis Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
iRead the information on qualified
specialist workshops: (Ypage 25).
Engine compartment
Hood
Important safety notes
GWARNING
If the hood is unlatched, it may open up when
the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving.
GWARNING
When opening and closing the hood, it may
suddenly fall into the closed position.There is
a risk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one is
within its range of movement.
GWARNING
Certain components in the engine
compartment, such as the engine, radiator
and parts of the exhaust system, can become
very hot. Working in the engine compartment
poses a risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
GWARNING
Opening the hood when the engine is
overheated or when there is a fire in the
engine compartmentcould expose you to hot
gases or other service products. There is a
risk of injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
GWARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is a risk of injury.
If you need to do any work inside the engine
compartment,
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rkeep clothing away from moving parts
GWARNING
The ignition system and the fuel injection
system work under high voltage. If you touch
components which are under voltage, you
could get an electric shock. There is a risk of
injury.
Never touch components of the ignition
system or fuel injection system when the
ignition is switched on.
Opening the hood
GWARNING
When the hood is open and the windshield
wipers are set in motion,you can be injured
by the wiper linkage. There is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
280Engine compartment
Maintenance and care

!Make sure that the windshieldwipers are
not folded away fromthe windshield. You
could otherwise damage the windshield
wipers or the hood.
XMake sure that the windshield wipers are
switched off.
XPull release leveron the hood.
The hood is released.
XReach into the gap between the hood and
the radiator trim and press hood catch
leverto the left.
XRaise the hood.
XPull support strut!out of bracket.
XLift up support strut!and insert it into
yellow retaining clip".
Closing the hood
XRaise the hood slightly and, at the same
time, remove support strut!from yellow
retaining clip".
XSwing support strut!down and press it
into bracketuntil it engages.
XLower the hood and let it fall from a height
of approximately 8 in (20 cm).
XCheck that the hood has engaged properly.
If the hood can be raised slightly, it is not
properly engaged. Do not press the hood
closed. Open the hood again and close it
with a little more force.
Engine oil
General notes
Depending on the driving style, the vehicle
consumes up to 0.9 US qt (0.8 liters) of oil
overadistanceof600 miles(1,000 km). The
oil consumption may be higher than this when
the vehicle is new or if you frequently drive at
high engine speeds.
Depending on the engine, the oil dipstickmay
be in a different location.
When checking the oil level:
Rpark the vehicle on a level surface.
Rthe engine should be switched off for
approximately five minutes if the engine is
at normal operating temperature.
Rif the engine is not at normal operating
temperature, e.g.ifthe engine was only
started briefly: wait about 30 minutes
before carrying out the measurement.
Engine compartment281
Maintenance and care
Z