light MERCEDES-BENZ GL SUV 2012 Repair Manual

the main-bea
mheadlamps are switched on
automatically. The Kindicator lam pin
the instrument cluster also lights up.
If you are driving at speeds below
45 km/ horother road users are recog-
nised or the roads are adequately lit:
the main-beam headlamps are switched off
automatically. The Kindicator lamp in
the instrument cluster goe sout. The _
indicator lamp in the multifunction display
remains lit.
X To deactivate: move the combination
switch back to its normal position.
The _ indicator lamp in the instrument
cluster goes out. Headlamp
smisted up on the inside
The headlamps may mist up on the inside if
ther eish igh atmospheric humidity.
X Switc honthe lights and drive off.
The level of moistur ediminishes, depend-
ing on the lengt hofthe jour neya nd the
weather conditions (humidity and temper-
ature).
If the level of moisture doe snot diminish:
X Hav ethe headlamps checked at aqualified
specialist workshop. Interior lighting
Overview of interior lighting
Overhead control panel
:
p To switch the left-hand fron treading
lam pon/off
; c To switch the fron tinterior lighting
on
= v To switch the rear interior lighting
on/off
? | To switch the fron tinterior light ing/
automatic int eriorl ightin gcontrol off
A p To switc hthe right-han dfront read-
ing lamp on/off
B To switch th eautomatic interior lighting
control on Rear overhead control panel (second row of seats)
: To switc hthe readin glamp on/off 126
Interior lightingLight
sand windscreen wipers

Rear overhead control panel (thir
drow of seats)
: Readin glamp Interior lightin
gcontrol
General notes In order to preven
tthe vehicle' sbattery from
discharging, the interior lighting functions are
automatically deactivated after some time
except for when the key is in position 2in the
ignition lock.
The colour and brightness of the ambient
lighting may be set using the on-board com-
puter (Y page 281).
Automatic interior lighting control Overhead control panel
:
p To switch the left-hand front reading
lamp on/off
; c To switch the front interior lighting
on
= v To switch the rear interior lighting
on/off ?
| To switch the front interior lighting/
automatic interior lighting control off
A p To switch the right-hand front read-
ing lamp on/off
B To switch the automatic interior lighting
control on
X To switch on: set the switch to centre
position B.
X To switch off: set the switch to the |
position.
The interior lighting automatically switches
on if you:
R unlock the vehicle
R open adoor
R remove the key from the ignition lock
The interior lightin gisactivate dfor as hort
tim ew hen the key is removed from the igni-
tion lock .You can activate this delayed
switch-of fusing the on-boar dcomputer
(Y page 282).
Manua linterior lighting control Overhead con
trolpanel
: p To switch the left-hand front reading
lamp on/off
; c To switch the front interior lighting
on
= v To switch the rear interior lighting
on/off
? | To switch the front interior lighting/
automatic interior lighting control off Interior lighting
127Lights and windscreen wipers Z

A
p To switc hthe right-hand fron tread-
ing lam pon/off
B To switch the automati cinterior lighting
control on
X To switch on the front interior lighting:
set the switch to the cpositio n.
X To switch off the interior lighting: set the
switch to the |positio nor(if the door
is closed) to the centre position.
X To switch the rear interior lighting on/
off: press the ubutton.
X To switch the reading lamp son/off:
press the pbutton. Crash-responsive emergency lighting
The interior lightin gisa ctivated automatically
if the vehicle is involved in an accident.
X To switch off the crash-responsive
emergenc ylighting: press the hazard
warning lamp button.
or
X Lock and then unlock the vehicle using the
key. Replacing bulbs
Important safet
ynotes
Xenon bulbs G
DANGER
Xenon bulbs are under high voltage. If you
touch the electrical contact sofaxenon bulb,
you could suffer an electric shock and be seri-
ously or even fatally inju red. For this reason,
do not remove the cover of xenon bulbs.
Do not change the xenon bulbs yourself, but
have them replaced at aqualified workshop.
If your vehicle is equipped with xenon bulbs,
you can recognise this by the following :the
con eoflight 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.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Hav
ethe headlamp setting checked regularly.
Other bulbs G
WARNING
Bulbs and lamps can be ver yhot. You should
therefore allow them to cool down befor eyou
change them .Otherwise, you could be burned
if you touch them.
Keep bulbs out of the reach of children .Oth-
erwise, the ycould damage the bulbs, for
example, and inj uret hemselves.
Never use abulbw hich ha sbeend ropped.
Suc hab ulbm ay break or even explode and
injure you.
Haloge nbulbs are pressurised and can
explode when you change them ,particularly
if they are ver yhot.Y ou should therefor ewear
eye protec tion and gloves when you are
changing them.
There are bulbs other than the xenon bulbs
that you can notreplace. Replace only the
bulbs listed (Y page 129). Hav ethe bulbs that
you can notreplace yourself changed at a
qualified specialist workshop.
If you require assistanc echanging bulbs, con-
sult aqualified specialist workshop.
Do not touch the glass tube of new bulbs with
your bare hands. Even minor contamination
can burn into the glass surface and reduce
the service life of the bulbs .Always use alint-
free cloth or only touch the base of the bulb
when fitting.
Only use bulbs of the correc ttype.
If the new bulb still does not light up, consult
aq ualified specialist workshop.
Bulbs and lamps are an importan taspect of
vehicle safety .You must therefor emake sure
that these function correctly at all times.
Have the headlamp setting checked regularly. 128
Replacing bulbsLights and windscree
nwipers

Overview of bulb replacement
–bulbs
Yo uc an replace the following bulbs. The
details for the bul btype can be found in the
legend. Halogen headlamps
:
Dipped-bea mheadlamp: H7 55 W
; Main-beam headlamp: H7 55 W
= Side lamps/par king lamp: W5WBV Tail lamps
:
Brake lamp: P21W-L Replacing the fron
tbulbs
Fitting /removing the cover on the front
wheel arch You must remov
ethe cover from the front
wheel housing before you can change the
front bulbs. X
To remove: switch off the lights.
X Tur nthe front wheels inwards.
X Remov esecuring pin ;using asuitable
tool.
X Slid ecover :up and remove it.
X To fit: insertcover :again and slide it
down until it engages.
X Insert securin gpin; .
Dipped-beam headlamps (halogen
headlamps) X
Remove the cove rinthe front whee larch
(Y page 129).
X Turn housing co ver:anti-clockwise and
pull it out.
X Turn bulb ho lder;anti-clockwise and pull
it out.
X Take the bulb ou tofbulb holder ;.
X Insert the new bulb int obulb holder ;.
X Insert bulb holder ;into the lamp and turn
it clockwise. Replacin
gbulbs
129Lightsand windscreen wipers Z

X
Align housing cover :and turn it clock-
wise unti litengages.
X Replace the cove rinthe front wheel arch
(Y page 129).
Main-beam headla mps(halogen head-
lamps) X
Switch off the lights.
X Open the bonnet.
X Turn housing cover :anti-clockwise and
pull it out.
X Pull lever =upwards and remov ebulb
holder ;.
X Take the bulb out of bulb holder ;.
X Insert the new bulb into bulb holder ;.
X Simultaneously press bulb holder ;and
pull lever =downwards.
X Align housing cover :and turn it clock-
wise until it engages.
Side lamps/parking lamps (halogen
headlamps) X
Switch off the lights.
X Open the bonnet.
X Turn housing cover :anti-clockwise and
pull it out.
X Pull out bulb holder ;.
X Take the bulb out of bulb holder ;.
X Insert the new bulb into bulb holder ;.
X Insert bulb holder ;.
X Align housing cover :and turn it clock-
wise until it engages. Replacing the rear bulbs
Openin gand closing th eservice flap Left
-hand service flap Right-hand service flap130
Replacin
gbulbsLight sand windscreen wipers

You must open the service flap in the luggage
compartmen
tbefor eyou can replac ethe
bulbs in the bra kelamp.
X To open: release service flap :at the top,
e.g. with ascrewdriver, and swing it down-
ward in the dire ction of the arrow.
X Right side: remove the first -aid kit before-
hand and pull the luggage net down.
X To close: reinsert service flap :.
Brake lamp X
Switch off the lights.
X Open the luggage compartment.
X Open the service flap (Y page 130).
X Turn bulb holder :anti-clockwise and
remove it.
X Take bulb out of bulb holder :.
X Insert the new bulb int obulb holder :.
X Insert bulb holder :intothe lamp and turn
it clockwise.
X Close th eservic eflap (Y page 130). Windscree
nwipers Switchin
gthe windscreen wiper son/
off G
WA
RNING
The windscree nwill not longer be wiped prop-
erly if the wiper blades are worn .This could
prevent you from observing the traffic condi-
tions, thereby causing an accident .Replace the wiper blades twic
eayear, ideally in spring
and autumn.
! Do not operate the windscreen wipers
when the windscreen is dry, as this could
damage the wiper blades. Moreover ,dust
that has collected on the windscreen can
scratc hthe glass if wipin gtakes place when
the windscreen is dry.
If it is necessary to switch on the wind-
screen wipers in dry weather conditions,
always operate them using washe rfluid.
! If the windscreen wipers leave smears on
the windscreen after the vehicle has been
washed in an automatic car wash, this may
be due to wax or other residue. Clean the
windscreen with washer fluid after an auto-
matic car wash.
! Intermit tentwiping with rain sensor: due
to optical influences and the windscreen
becoming dirty in dry weather conditions,
the windscreen wipers may be activated
inadvertently. This could damage the wind-
screen wiper blades or scratc hthe wind-
screen.
For this reason, you should always switch
off the windscreen wiper sind ry weather. Combinatio
nswitch
1 $ Windscreen wipers off
2 Ä Intermittent wipe, low (rain sensor
set to low sensitivity)
3 Å Intermittent wipe, high (rain sensor
set to high sensitivity)
4 ° Continuous wipe, slow Windscreen wipers
131Lights and windscreen wipers Z

5
¯ Continuous wipe, fast
B í Single wipe
C î To wipe with washer fluid
X Turn the key to position 1or 2in the ignition
lock (Y page 159).
X Turn the combination switc htothe corre-
sponding position.
In the ÄorÅ position, the appropriate
wipin gfrequency is se tautomatically accord-
ing to the intensity of the rain. In the Å
posi tion, the rain sensor is mor esensitive
than in the Äposition, causin gthe wind-
screen wiper stowipe mor efrequently. Switc
hing th erearw indow wiper on/
off Combi
nation switch
: è Rear windo wwiper switch
2 b To wipe with washer fluid
3 ITo switc honintermitten twiping
4 0To switc hoff intermittent wiping
5 ô To wip ewith washer fluid
X Turn the key to position 1or 2in the ignition
lock (Y page 159).
X Turn switch :on the combination switch
to the correspondin gposition.
When the rea rwindow wiper is switched on,
the icon appears in the instrumen tcluster. Replacing th
ewiper blades
Important safety notes G
WAR
NING
The wipe rarms could start moving and cause
an injury if you leave the windscreen wipers
switche don.
Remove the key from the ignition lock before
replacing the wipe rblades.
! Never open the bonnet if awindscreen
wiper arm has been folded away from the
windscreen.
Never fold awindscreen wiper arm without
aw iper blade back ont othe windscreen/
rea rwindow.
Hold the windscreen wiper arm firmly when
you change the wiper blade. If you release
the windscreen wiper arm without awiper
blade and it falls ont othe windscreen, the
windscreen ma ybedamaged by the force
of the impact.
Mercedes-Benz recommends that you have
the wiper blades changed at aqualified
specialist workshop.
! To avoid damaging the windscreen wiper
blades, mak esure that you touc honly the
wipe rarm of th ewindsc reen wiper.
Replacing th ewindscreen wiper blades Removing th
ewiper blades
X Remov ethe key fr om theignition lock.
X Fold the wiper ar maway fro mthe wind-
screen. 132
Windscreen wipersLights and windscreen wipers

X
Firml ypress release knob :and pull the
wipe rblade upwards from the wiper arm in
the directio nofthe arrow.
Fitting th ewiper blades X
Position the new wiper blade in the retainer
on the wiper arm and slide it into place in
the opposite direction to the arrow.
The wiper blade audibly engages.
X Make sure that wiper blade is seated cor-
rectly.
X Fold the wiper arm back onto the wind-
screen.
Replacing the rear window wiper blade Removing the wiper blades
G
WARNING
The wiper arm could be set in motion and
injur eyou if the windscreen wiper sare
switched on.
Remove th ekey from the ignition lock before
replacing the wiper blade. X
Remov ethe key from the ignition lock.
X Fold wiper arm :away from the rea rwin-
dow until it engages.
X Position wiper blade ;atar ight angle to
wiper arm :.
X Hold wiper arm :and press wiper
blade ;in the direction of the arrow until
it releases.
X Remove wiper blade ;.
Fitting the wiper blade
X Place new wiper blade ;onto wiper
arm :.
X Hold wiper arm :and press wiper
blade ;in the opposite direction to the
arrow until it engages.
X Make sure that wiper blade ;is seated
correctly.
X Position wiper blade ;parallel to wiper
arm :.
X Fold wiper arm :back onto the rear win-
dow. Problems with the windscreen wipers
The windscreen wipers are obstructed X
For safety reasons, you should remov ethe
key from the ignition lock.
or
X Switc hoff th eengine using the Start/Stop
butto nand ope nthe driver's door.
X Remove the cause of the obstruction.
X Switc hthe windscreen wiper sback on.
The windscreen wipers are inoperative The windscreen wiper drive is malfunctioning.
X
Select another wiper spee donthe combi-
nation switch.
X Hav ethe windscreen wiper schecked at a
qualified specialist workshop. Windscreen wipers
133Lights and windscreen wipers Z

=
Directs the airflo wthroug hthe rear air vents
? Directs the airflow thr oughthe footwell vents Informatio
nabout using THERMATIC
automatic climate control
The following contains notes and recommen-
dation sonoptimum use of THERMATIC auto-
matic climate control.
R Activat eclimate control using the Ãand
Á buttons. The indicator lamps in the
à andÁ buttons light up.
R Set the temperature to 22 †.
R Only use the demisting func tion briefly until
the windscreen is clea ragain.
R Only use the air-recirculation mode briefly,
e.g. if ther eare unpleas anto utside odours
or when in atunnel. The windows could
otherwis emist up as no fresh air is drawn
into the vehicle in air-recirculation mode.
R Use the ZONE func tion to adopt the tem-
peratur esettings on the driver' sside for
the front-passenger side as well. The indi-
cator lamp above the ábutton goes
out. 138
Overview of climate control systemsClimat
econtrol

Q
Switche srear-com partment climate contro lon/of f(Y page 141)
R Reduces the airflow (Y page 144)Informat
iona bout using
THERMOTRONIC automatic climate
control
The following contains instructions and rec-
omm endations to enabl eyou to get the most
ou tofy our THERMOTRONIC automatic cli-
mate con trol.
R Activate climate con trol using the Ãand
¿ buttons. The indicator lamps above
the à and¿ button slight up.
R In automatic mode, you can also use the
ñ button to set aclimate mode
(FOCUS/MEDIUM/DIFFUSE). The
MEDIU Mlevel is recommended.
R Set the temperature to 22 †.
R Only use the demisting function briefly until
the windscreen is clear again.
R Only use the air-recir culation mode briefly,
e.g. if there are unpleasant outside odours
or when in atunnel. The windows could
otherwis emist up as no fresh air is drawn
into the vehicle in air-recirculation mode.
R Use the ZONE func tion to adopt the tem-
peratur esettings on the driver' sside for
the front-passenger side and the rear com-
partmen taswell. The indicator lamp above
the á button goes out.
R Use the residual heat function if you want
to heat or ventilate the vehicl einterior
whe nthe ignition is switched off .The resid-
ual heat func tion can only be activated or
deactivated with the ignition switched off. Operating th
eclimat econtrol system Switching climate control on/off
Points to observe before use i
If climat econtrol is switched off ,the air
supply and air circulation ar ealso switched off. Only select this settin
gbriefly. Other-
wise ,the windows ma ymist up.
i Switch on climate control primarily using
the à button (Y page 142).
In the rear compartment, you can also switch
climate control on and off using the Ãand
^ buttons.
Switching on/off X
Turn the key to position 2in the ignition
lock.
X To switch on: press buttonÃ.
The indicator lamp in the Ãbutton lights
up. Airflow and air distribution are set to
automatic mode.
or
X Press the ^button.
The indicator lamp in the ^button goes
out. The previous settings are reactivated.
X To switch off: press the^button.
The indicator lamp in the ^button lights
up. Activating/deactivating the cooling
with air dehu
midification function
Points to observe before use G
WARNING
If the "cooling with air dehumidification" func-
tion is deactivated, the air inside the vehicle
will not be cooled (during warm weather) or
dehumidified. The windows could mist up
more quickly. This may prevent you from
observing the traffic conditions, thereby caus-
ing an accident.
The cooling with air dehumidification function
is only available when the engine is running.
The air inside the vehicle is cooled and dehu- Operating the climate control system
141Climatecontrol Z