2015 MERCEDES-BENZ GLK-CLASS SUV service

Problems with fuel and the fuel tank
ProblemPossible causes/consequences and M Solutions
Fuel is leaking from the
vehicle.The fuel line or the fuel tank is faulty.
GWARNING
Risk of explosion or fire.
X Turn the SmartKey to position 0 immediately and remove it
( Y page 149).
X Do not restart the engine under any circumstances.
X Consult a qualified specialist workshop.
The engine does not
start.The fuel tank of a vehicle with a diesel engine has been run com-
pletely dry.
X Refuel the vehicle with at least 5.3 US qt (5 liters) of diesel.
X Turn the ignition on for approximately ten seconds
(Y page 149).
X Start the engine continuously for up to ten seconds unt il it runs
smoothly.
If the engine does not start: X Turn the ignition on again for approximately ten seconds
(Y page 149).
X Start the engine again continuously for up to ten seco nds until it
runs smoothly.
If the engine does not start after three attempts:
X Consult a qualified specialist workshop.
The fuel filler flap can-
not be opened.The fuel filler flap is not unlocked.
X Unlock the vehicle ( Y page 78).
The SmartKey battery is discharged or nearly discharged.
X Unlock the vehicle using the mechanical key ( Y page 80).
The fuel filler flap is unlocked, but the opening mecha nism is jam-
med.
X Consult a qualified specialist workshop.
DEF (BlueTEC vehicles only)
Important notes on use
To function properly, BlueTEC exhaust gas
aftertreatment must be operated with the
reducing agent DEF. Adding DEF is one of the tasks performed during maintenance. Under
normal operating conditions, a tank of DEF
lasts until the next service due date.
When the supply of DEF is almost used up, theCheck Additive See Operator's Manual
Refueling165
Driving and parking
Z

XTurn DEF cap : counter-clockwise and
remove it.
X Turn DEF filler cap ; counter-clockwise
and open it.
Filler cap ; is secured with a plastic strip.
X
Unscrew the protective cap from DEF refill
bottle =.
X Place DEF refill bottle = on the filler neck
as shown and screw it on clockwise until
hand-tight.
X Press DEF refill bottle = downward.
The DEF tank is filled. This may take up to
one minute.
iTo top up between service intervals, fill
the DEF tank with approximately 1 gal
(3.8 l) of DEF. 1 gal (3.8 l) DEF is equivalent
to approximately 2 DEF refill bottles. Then
have the DEF supply checked at a qualified specialist workshop and completely refilled
if necessary.
X Release DEF refill bottle =.
When DEF refill bottle = is no longer
pressed down, filling stops. DEF refill bottle = can be removed when it has been only
partially emptied.
X Turn DEF refill bottle = counter-clockwise
and remove it.
X Place DEF filler cap ; on the filler neck and
turn it clockwise.
X Replace DEF cover : as shown and turn it
clockwise as far as it will go.
X Fold the cargo compartment floor down.
X Close the tailgate.
X Drive faster than 10 mph (16 km/h).
The
Check Additive See Operator's
Manual message goes out after approx-
imately one minute.
iIf the Check Additive See OperaZ
tor's Manual message is still shown in
the multifunction display, add an additional bottle of DEF.
For further information on DEF, see
( Y page 376).
Refueling167
Driving and parking
Z

iIn the event of an emergency, the engine
can be turned off while the vehicle is in
motion by pressing and holding the Start/
Stop button for three seconds.
Parking brake
GWARNING
If you must brake the vehicle with the parking brake, the braking distance is considerably
longer and the wheels could lock. There is an
increased danger of skidding and accidents.
Only use the parking brake to brake the vehi-
cle when the service brake is faulty. Do not
apply the parking brake too firmly. If the
wheels lock, release the parking brake until
the wheels begin turning again.
GWARNING
If you leave children unsupervised in the vehi- cle, they could set it in motion by, for example:
R release the parking brake.
R shift the automatic transmission out of the
parking position P.
R start the engine.
In addition, they may operate vehicle equip-
ment and become trapped. 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 unsupervised in the vehicle.
If you brake the vehicle with the parking
brake, the brake lamps will not light up.
X To apply: depress parking brake ; firmly.
When the engine is running, the $ (USA
only) or J (Canada only) indicator lamp
lights up in the instrument cluster.
X To release: depress the brake pedal and
keep it depressed.
X Pull release handle :.
When the ignition is switched on or the
engine is running, the $ (USA only) or
J (Canada only) indicator lamp goes out
in the instrument cluster.
Parking the vehicle for a long period
If you leave the vehicle parked for longer than
four weeks, the battery may be damaged by
exhaustive discharging.
If you leave the vehicle parked for longer than six weeks, the vehicle may suffer damage as a
result of lack of use. X Visit a qualified specialist workshop and
seek advice.
iYou can obtain information about trickle
chargers from a qualified specialist work-
shop.
Driving tips
General driving tips
Important safety notes
GWARNING
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.
GWARNING
If you operate mobile communication equip-
ment while driving, you will be distracted from
Driving tips169
Driving and parking
Z

traffic conditions. You could also lose controlof the vehicle. There is a risk of an accident.
Only operate this equipment when the vehicle is stationary.
Observe the legal requirements for the coun- try in which you are driving. Some jurisdic-
tions prohibit the driver from using a mobile
phone while driving a vehicle.
If you make a call while driving, always use
hands-free mode. Only operate the telephone when the traffic situation permits. If you are
unsure, pull over to a safe location and stop
before operating the telephone.
Bear in mind that at a speed of only 30 mph
(approximately 50 km/h), the vehicle covers
a distance of 44 ft (approximately 14 m) per
second.
Drive sensibly – save fuel
Observe the following tips to save fuel:
X The tires should always be inflated to the
recommended tire 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
Maintenance Booklet or by the service
interval display.
Fuel consumption also increases when driv-
ing 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 judg-
ment.
The possibility of a serious or even fatal acci-dent 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 tak-
ing 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 with-
out 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, all work on the engine must be 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-Benz service requirements. Details can be found in the Maintenance Booklet.
ECO display
The ECO display provides feedback on how
economical your driving characteristics are.
The ECO display assists you in achieving the
most economical driving style for the selec-
ted settings and prevailing conditions. Your
driving style can significantly influence the
vehicle's consumption.
170Driving tips
Driving and parking

fied specialist workshop. Consult a qualified
specialist workshop to arrange this.
Have brake pads installed and brake fluid
replaced at a qualified specialist workshop.
! Vehicles with 4MATIC: function or per-
formance tests may only be carried out on
a 2-axle dynamometer. If you are planning
to have the vehicle tested on such a dyna-
mometer, 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 automati-
cally, the engine and the ignition must be
switched off (SmartKey in position 0 or 1 in
the ignition lock) when:
R testing the parking brake on a brake
dynamometer.
R you intend to have the vehicle towed with
the front or rear axle raised (not permit-
ted for vehicles with 4MATIC).
Braking maneuvers triggered automatically
by ESP ®
may seriously damage the brake
system.
If the brake system has only been subject to
moderate loads, you should test the function- ality of your brakes at regular intervals. To do so, press firmly on the brake pedal when driv-
ing at a high speed. This improves the grip of
the brake pads.
You can find a description of Brake Assist
(BAS) on ( Y page 69).
Mercedes-Benz recommends that you only
have brake pads/linings installed on your
vehicle which have been approved for
Mercedes-Benz vehicles or which correspond to an equivalent quality standard. Brake
pads/linings which have not been approved
for Mercedes-Benz vehicles or which are not
of an equivalent quality could affect your vehi-
cle's operating safety.
Mercedes-Benz recommends that you only
use brake fluid that has been specially
approved for your vehicle by Mercedes-Benz,
or which corresponds to an equivalent quality standard. Brake fluid which has not been
approved for Mercedes-Benz vehicles or
which is not of an equivalent quality could
affect your vehicle's operating safety.
Parking brake
GWARNING
If you must brake the vehicle with the parking
brake, the braking distance is considerably
longer and the wheels could lock. There is an
increased danger of skidding and accidents.
Only use the parking brake to brake the vehi-
cle when the service brake is faulty. Do not
apply the parking brake too firmly. If the
wheels lock, release the parking brake until
the wheels begin turning again.
If you brake the vehicle with the parking
brake, the brake lamps will not light up.
If you drive on wet roads or dirt-covered sur-
faces, road salt and/or dirt could get into the parking brake.
In order to prevent corrosion and a reduction
in the braking power of the parking brake,
observe the following:
R gently depress the parking brake from time
to time before beginning the journey.
R Drive for approximately 110 yds (100 m) at
a maximum speed of 12 mph (20 km/h).
Driving on wet roads
Hydroplaning
If water has accumulated to a certain depth
on the road surface, there is a danger of
hydroplaning occurring, even if: R you drive at low speeds.
R the tires have adequate tread depth.
For this reason, in the event of heavy rain or in
conditions in which hydroplaning may occur,
you must drive in the following manner:
R lower your speed.
R avoid ruts.
Driving tips173
Driving and parking
Z

Useful information
iThis Operator's Manual describes all
models and all standard and optional equip- ment 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 special-
ist workshops ( Y page 27).
Important safety notes
GWARNING
If you operate information systems and com-
munication equipment integrated in the vehi-
cle while driving, you will be distracted from
traffic conditions. You could also lose controlof the vehicle. There is a risk of an accident.
Only operate the equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
You must observe the legal requirements for
the country in which you are currently driving when operating the on-board computer.
GWARNING
If the instrument cluster has failed or mal-
functioned, you may not recognize function
restrictions in systems relevant to safety. The operating safety of your vehicle may be
impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately.
The on-board computer only shows messages
or warnings from certain systems in the mul- tifunction display. You should therefore make sure your vehicle is operating safely at all
times.
If the operating safety of your vehicle is
impaired, pull over as soon as it is safe to do
so. Contact a qualified specialist workshop.
For an overview, see the instrument panel
illustration (
Y page 33).
Displays and operation
Coolant temperature display
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could 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.
The coolant temperature gauge is in the
instrument cluster on the left-hand side.
Under normal operating conditions and with
the specified coolant level, the coolant tem-
perature may rise to 248 ‡ (120 †).
! A display message is shown if the coolant
temperature is too high.
If the coolant temperature is over 248 ‡
(120 †), do not continue driving. The
engine will otherwise be damaged.
Tachometer
The red band in the tachometer indicates the
engine's overrevving range.
! Do not drive in the overrevving range, as
this could damage the engine.
The fuel supply is interrupted to protect the
engine when the red band is reached.
220Displays and operation
On-board computer and displays

XTo select the next/previous track:
briefly press the 9 or : button.
X To select a track from the track list
(rapid scrolling): press and hold the 9
or : button until desired track has been
reached.
If you press and hold 9 or : , the rapid
scrolling speed is increased. Not all audio
drives or data carriers support this function.
If track information is stored on the audio
device or medium, the multifunction display
will show the number and name of the track.
Video DVD operation
Example: CD/DVD changer display :
Current scene
Only on vehicles with COMAND can you oper-
ate DVD videos using the
Audio menu.
X Switch on COMAND and select video DVD
(see the separate operating instructions).
X Press the = or ; button on the steer-
ing wheel to select the
Audio menu.
X To select the next/previous scene:
briefly press the 9 or : button.
X To select a scene from the scene list
(rapid scrolling): press and hold the 9
or : button until desired scene has
been reached.
Telephone menu
Introduction
GWARNING
If you operate information systems and com-
munication equipment integrated in the vehi- cle while driving, you will be distracted from
traffic conditions. You could also lose controlof the vehicle. There is a risk of an accident.
Only operate the equipment when the traffic
situation permits. If you are not sure that this is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
When telephoning, you must observe the
legal requirements for the country in which
you are currently driving.
X Switch on the mobile phone (see the sep-
arate manufacturer's operating instruc-
tions).
X Switch on the audio system or COMAND
(see the separate operating instructions).
X Establish a Bluetooth ®
connection to the
audio system or COMAND (see the sepa-
rate operating instructions).
X Press the = or ; button on the steer-
ing wheel to select the
Tel menu.
You will see one of the following display mes-
sages in the multifunction display: R
Phone READY or the name of the network
provider: the mobile phone has found a
network and is ready to receive.
R
Phone No Service: there is no network
available or the mobile phone is searching
for a network.
Accepting a call
If someone calls you when you are in the Tel
menu, a display message appears in the mul- tifunction display, for example:
Example: incoming call
X Press the 6 button on the steering
wheel to accept an incoming call.
Menus and submenus227
On-board computer and displays
Z

If the Blind Spot Assist Sensors DeacZ
tivated or Act. Blind Spot Asst. SenZ
sors Deactivated message appears, the
radar sensor system is deactivated.
X Switch on the radar sensor system
(Y page 233).
For further information about Blind Spot
Assist, see ( Y page 203).
For further information about Active Blind
Spot Assist, see ( Y page 207).
Activating/deactivating Lane Keeping
Assist
X
Press the = or ; button on the steer-
ing wheel to select the
DriveAssist menu.
X Press the 9 or : button to select
Lane Keep. Asst.
X
Press the a button.
The current selection is displayed.
X Press a to confirm.
X Press the : or 9 button to set
Off,
Standard or Adaptive.
X Press the a button to save the setting.
When Lane Keeping Assist or Active Lane
Keeping Assist is activated, the multifunc-
tion display shows the lane markings as
bright lines in the assistance graphic.
For further information about Lane Keeping
Assist, see ( Y page 205).
For further information about Active Lane
Keeping Assist, see ( Y page 210).
Service menu
Depending on the equipment installed in the
vehicle, you have the following options in the
Serv. menu: R
Calling up display messages
(Y page 235)
R Checking the tire pressure electronically
(Y page 339)
R Calling up the service due date
(Y page 304)
Settings menu
Introduction
Depending on the equipment installed in the
vehicle, In the
Sett. menu you have the fol-
lowing options:
R Changing the instrument cluster settings
(Y page 230)
R Changing the light settings ( Y page 231)
R Changing the vehicle settings
(Y page 232)
R Changing the convenience settings
(Y page 233)
R Restoring the factory settings
(Y page 234)
Instrument cluster
Selecting the unit of measurement for dis-
tance
You can determine whether the multifunction
display shows some messages in miles or
kilometers. X Press the = or ; button on the steer-
ing wheel to select the
Sett. menu.
X Press the : or 9 button to select the
Inst. Cluster submenu.
X Press a to confirm.
230Menus and submenus
On-board computer and displays