MERCEDES-BENZ M-Class 2014 W166 Owner's Manual

Crash-responsive emergency lighting
The interio rlighting is activated automatically
if the vehicle is involved in an accident.
X To switch off the crash-responsive
emergency lighting: press the hazard
warning lamp button.
or
X Loc kand then unlock the vehicle using the
SmartKey. Replacing bulbs
Important safety notes
G
DANGER
Xeno nbulbs carry a high voltage. You can get
an electric shock if you remove the cover of
the Xenon bulb and touch the electrical
contacts. There is a risk of fatal injury.
Never touch the parts or the electrical
contacts of the Xenon bulb. Always have work
on the Xenon bulbs carried out at a qualified
specialist workshop.
If your vehicle is equipped with Xenon bulbs,
you can recognize this by the following: the
cone of light from the Xenon bulbs moves
from the top to the bottom and back again
when you start the engine. For this to be
observed, the lights must be switched on
before starting the engine. G
WARNING
Bulbs, lamps and connectors can get very hot
when operating. If you change a bulb, you
could burn yourself on these components.
There is a ris kofinjury.
Allow these components to cool down before
changing a bulb.
Do not use a bulb tha thas been dropped or if
its glass tube has been scratched.
The bulb may explode if:
R you touch it
R it is hot R
you drop it
R you scratch it
Only operate bulbs in enclosed lamps
designed for that purpose. Only install spare
bulbs of the same type and the specified
voltage.
Marks on the glass tube reduce the service
life of the bulbs. Do no ttouch the glass tube
with your bare hands. If necessary, clean the
glass tube when cold with alcohol or spirit and
rub it off with a lint-free cloth.
Protec tbulbs from moisture during
operation .Do not allow bulbs to come into
contact with liquids.
There are bulbs other than the Xenon bulbs
that you cannot replace. Replace only the
bulbs listed (Y page 129). Have the bulbs that
you cannot replace yourself changed at a
qualified specialist workshop.
If you require assistance changing bulbs,
consult a qualified specialist workshop.
If the new bulb still does not light up, consult
a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly. Overview: changing bulbs/bulb types
You can change the following bulbs. The bulb
type can be found in the legend. Replacing bulbs
129Lights and windshiel dwipers Z

Halogen headlamps
0002
Low-beam headlamp: H7 55 W
0003 High-bea mheadlamp: H7 55 W
0023 Parking lamp/standing lamp: W 5 W BV
0022 Side marker lamp: WY 5 W Tail lamp
0002
Brake lamp: P 21 W-L Changing the front bulbs
Removing and installing the cover in the
front wheel housing You must remove the cover from the front
wheel housing before you can change the
fron
tbulbs. X
To remove: switch off the lights.
X Turn the fron twheels inwards.
X Remove securing pin 0003using a suitable
tool.
X Slide cover 0002up and remove it.
X To install: insert cover 0002again and slide
it down until it engages.
X Insert securing pin 0003.
Low-beam headlamps (halogen
headlamps) X
Remove the cover in the front wheel
housing (Y page 130).
X Turn housing cover 0002counter-clockwise
and pull it out.
X Turn bulb holder 0003counter-clockwise and
pull it out.
X Take the bulb out of bulb holder 0003.
X Insert the new bulb into bulb holder 0003.
X Insert bulb holder 0003into the lamp and turn
it clockwise. 130
Replacing bulbsLights and windshield wipers

X
Align housing cover 0002and turn it
clockwise until it engages.
X Replace the cove rinthe front wheel
housing (Y page 130).
High-beam headlamps (halogen
headlamps) X
Switch off the lights.
X Open the hood.
X Turn housing cover 0002counter-clockwise
and pull it out.
X Pull lever 0023upwards and remove bulb
holder 0003.
X Take the bulb out of bulb holder 0003.
X Insert the new bulb into bulb holder 0003.
X Simultaneously press bulb holder 0003and
pull lever 0023downwards.
X Align housing cover 0002and turn it
clockwise until it engages.
Parking lamps/standing lamps
(halogen headlamps) X
Switch off the lights.
X Open the hood.
X Turn housing cover 0002counter-clockwise
and pull it out.
X Pull out bulb holder 0003.
X Take the bulb out of bulb holder 0003.
X Insert the new bulb into bulb holder 0003.
X Insert bulb holder 0003.
X Align housing cover 0002and turn it
clockwise until it engages.
Side marker lamps X
Remove the cover in the front wheel
housing (Y page 130).
X Turn cap 0003counter-clockwise and remove
it.
X Pull out bulb holder 0002.
X Take the bulb out of bulb holder 0002.
X Insert the new bulb into bulb holder 0002.
X Insert bulb holder 0002.
X Align cap 0003and turn it clockwise until it
engages.
X Replace the cover in the front wheel
housing (Y page 130). Replacing bulbs
131Lights and windshield wipers Z

Changing the rea
rbulbs
Opening and closing the service flap Left-hand service flap
Right-hand service flap
You must open the service flap in the cargo
compartment before you can change the
bulbs in the brake lamp.
X
To open: release service flap 0002at the top,
e.g. with a screwdriver, and swing it
downward in the direction of the arrow.
X Right side: remove the first-aid kit
beforehand and pull the parce lnet down.
X To close: reinsertservice flap 0002. Brake lamp X
Switch off the lights.
X Open the cargo compartment.
X Open the service flap (Y page 132).
X Turn bulb holder 0002counter-clockwise and
remove it.
X Take bulb out of bulb holder 0002.
X Inser tthe new bulb into bulb holder 0002.
X Insert bulb holder 0002into the lamp and turn
it clockwise.
X Close the service flap (Y page 132). Windshield wipers
Switching the windshield wipers on/
off
! Do not operate the windshield wipers
when the windshield is dry, as this could
damage the wiper blades. Moreover, dust
that has collected on the windshield can
scratch the glass if wiping takes place when
the windshield is dry.
If it is necessary to switch on the windshield
wipers in dry weather conditions, always
use washer fluid when operating the
windshield wipers.
! If the windshield wipers leave smears on
the windshield after the vehicle has been
washed in an automatic car wash, wax or
other residues may be the reason for this.
Cleant he windshield using washer fluid
after washing the vehicle in an automatic
car wash. 132
Windshield wipersLights and windshield wipers

!
Intermittent wiping with rain sensor: due
to optical influences and the windshield
becoming dirty in dry weather conditions,
the windshield wipers may be activated
inadvertently. This could then damage the
windshield wiper blades or scratch the
windshield.
For this reason, you should always switch
off the windshield wipers in dry weather. Combination switch
0005
0008 Windshield wiper off
0006 0001 Intermittent wipe, low (rain sensor
set to low sensitivity)
0007 0002 Intermittent wipe, high (rain sensor
set to high sensitivity)
000C 0018 Continuous wipe, slow
000D 0012 Continuous wipe, fast
0021 0007 Single wipe
0014 0008 To wipe with washer fluid
X Switch on the ignition.
X Turn the combination switch to the
corresponding position.
In the 0001or0002 position, the appropriate
wiping frequency is set automatically
according to the intensity of the rain. In
the 0002 position, the rain sensor is more
sensitive than in the 0001position, causing
the windshield wipers to wipe more
frequently.
If the wiper blades are worn, the windshield
will no longer be wiped properly.T his could
prevent you from observing the traffic
conditions. Replace the wiper blades twice a
year, ideally in spring and fall. Switching the rear window wiper on/
off
Combination switch
0002
0001 Rear window wiper switch
0006 0005 To wipe with washer fluid
0007 ITo switch on intermittent wiping
000C 0To switch off intermittent wiping
000D 000E To wipe with washer fluid
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 157).
X Turn switch 0002on the combination switch
to the corresponding position.
When the rear window wiper is switched on,
the icon appears in the instrumentc luster. Replacing the wiper blades
Important safety notes G
WARNING
If the windshield wipers begin to move while
you are changing the wiper blades, you could
be trapped by the wiper arm. There is a risk
of injury.
Always switch off the windshield wipers and
ignition before changing the wiper blades.
! Neve ropen the hood/tailgate if a wiper
arm has been folded away from the
windshield/rear window.
Never fold a windshield wiper arm without
a wiper blade back onto the windshield/
rear window. Windshield wipers
133Lights and windshield wipers Z

Hold the windshield wiper arm firmly when
you change the wiper blade. If you release
the wiper arm withou
tawiper blade and it
falls onto the windshield/rear window, the
windshield/rear window may be damaged
by the force of the impact.
Mercedes-Ben zrecommends that you have
the wiper blades changed at aqualified
specialist workshop.
! To avoid damaging the wiper blades,
make sure that you touch only the wiper
arm of the wiper.
Changing the windshield wiper blades Removing the wiper blades
X
Remove the SmartKey from the ignition
lock.
X Fold the wiper arm away from the
windshield. X
Firmly press release knob 0002and pull wiper
blade 0003upwards from the wiper arm in the
direction of the arrow. Installing the wiper blades X
Position new wiper blade 0002in the retainer
on the wiper arm and slide it into place in
the direction of the arrow.
The wiper blade audibly engages.
X Make sure that the wiper blade is seated
correctly.
X Fold the wiper arm back onto the
windshield.
Replacing the rea rwindow wiper blade Removing
awiper blade X
Remove the SmartKey from the ignition
lock.
X Fold wiper arm 0002away from the rear
window until it engages.
X Position wiper blade 0003at a right angle to
wiper arm 0002.
X Hold wiper arm 0002and press wiper
blade 0003in the direction of the arrow until
it releases.
X Remove wiper blade 0003.134
Windshield wipersLights and windshield wipers

Installing
awiper blade
X Place new wiper blade 0003onto wiper
arm 0002.
X Hold wiper arm 0002and press wiper
blade 0003in the opposite direction to the
arrow until it engages.
X Make sure that wiper blade 0003is seated
correctly.
X Position wiper blade 0003parallel to wiper
arm 0002.
X Fold wiper arm 0002back onto the rear
window. Windshield wipers
135Lights and windshield wipers Z

Problems with the windshield wipers
Problem Possible causes/consequences and
0001 Solutions
The windshield wipers
are jammed. Leaves or snow, for example, may be obstructing the windshield
wiper movement.T
he wiper motor has been deactivated.
X For safety reasons, you should remove the SmartKey from the
ignition lock.
or
X Switch off the engine using the Start/Stop button and open the
driver's door.
X Remove the cause of the obstruction.
X Switch the windshield wipers back on. The windshield wipers
fail completely. The windshield wiper drive is malfunctioning.
X
Select another wiper speed on the combination switch.
X Have the windshield wipers checked at a qualified specialist
workshop. 136
Windshield wipersLights and windshield wipers

Useful information
............................138
Overview of climate control sys-
tems ................................................... 138
Operating the climate control sys-
tems ................................................... 144
Setting the air vents .........................152 137Climate control

Useful information
i This 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.
i Read the information on qualified
specialist workshops: (Y page 28).Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could
otherwise fog up.
To preven tthe windows from fogging up:
R switch off climate control only briefly
R switch on air-recirculation mode only
briefly
R switch on the cooling with air
dehumidification function
R switch on the defrost windshield function
briefly, if required
Climate control regulates the temperature
and the humidity in the vehicle interior and
filters undesirable substances out of the air.
Climate control can only be operated when
the engine is running. Optimum operation is
only achieved with the side windows and roof
closed.
The residual heat function can only be
activated or deactivated with the ignition
switched off (Y page 151).
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature (Y page 95).
This will speed up the cooling process and
the desired vehicle interior temperature
will be reached more quickly. i
The integrated filter can filter out most
particles of dust, and completely filters out
pollen. Aclogged 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 Maintenance Booklet .As it
depends on environmental conditions, e.g.
heavy air pollution, the interval may be
shorter than stated in the Maintenance
Booklet.
i It 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. 138
Overview of climate control systemsClimate control