light MERCEDES-BENZ M-Class 2012 W166 Workshop Manual

Side
markerlamp s X
Remove thecover inthe front wheel arch
(Y page 115).
X Turn cap;counter -clockwiseandremove
it.
X Pull outbulb holder :.
X Take thebulb outofbulb holder :.
X Insert thenew bulb intobulb holder :.
X Insert bulbholder :.
X Align cap;and turn itclockwise.
X Inst allthe cover inthe front wheel arch
(Y page 115). Changing
therear bulbs
Opening andclosi ngthe service flap You
must opentheservice flapinthe cargo
compartmen tbefore youcan change the
bulbs inthe taillamps. Left-
hand service flap Right-hand
serviceflap
X To open: release serviceflap:atthe top,
e.g. with ascrewdriver, andswing it
downward inthe direction ofthe arrow.
X Right side:remove thefirst- aidkit
beforehand andpulltheparcel netdown.
X To close :reinsert serviceflap:.
Bra kelamp X
Switch offthe lights.
X Open thecargo compartmen t.
X Open theservice flap(Ypage 117). :
Brake lamp
X Turn thebulb holder counter -clockwiseand
remove it.
X Remove thebulb from thebulb holder.
X Insert thenew bulb intothebulb holder.
X Insert thebulb holder andturn itclockwise.
X Close theservice flap(Ypage 117). Replacing
bulbs
117Lights and windshieldwipers Z

Windshi
eldwipers Swi
tchin gthe windshie ldwipers on/
off G
WARNING Wip
erbla des arecomponents thataresub ject
to wea rand tea r.Re place thewipe rb lades
twic eayear, preferably inthe sprin gand fall.
Oth erwise thewindows willnotbewiped
proper ly.As aresult ,you may notbeable to
obser vesurro undin gtraffic condition sand
could cause anacc ident .
! Donot operat ethe windsh ieldwipers
when thewindsh ieldisdry, asthis could
damage thewiper blades. Moreover,dust
that hascollec tedonthe windsh ieldcan
scr atc hthe glass ifwiping takesplace when
the windsh ieldisdry.
! Ifthe windsh ieldwipers leavesmear son
the windsh ieldafterthe vehic lehas been
washed inan autom aticcarwash, waxor
oth erresidues maybethe reason forthis .
Clean thewindsh ieldusing washer fluid
aft erwashing thevehic lein an autom atic
car wash. Combin
ationswitch
1 $ Winds hieldwipers off
2 Ä Inter mit ten twipe, low7
3 Å Inter mit ten twipe, high8
4 ° Continuous wipe,slow
5 ¯ Continuous wipe,fast B
í Single wipe
C î Towipe withwasher fluid
X Swit chon the ignit ion.
X Turn thecom binat ionswitc hto the
appropr iateposit ionorpress thebutt onon
the side.
! Inter mit ten twiping withrainsensor: due
to optic alinf luenc esand thewindsh ield
becom ingdirtyin dry weather condition s,
the windsh ieldwipers maybeact ivate d
inadv ertent ly.This could thendamage the
wind shieldwiper blades orscrat ch the
wind shield.
For this reas on,you should always switch
off thewind shieldwiper sin dry weat her.
In theÄ orÅ position,theappro priate
wipin gfrequen cyisset auto maticall y
acc ording totheint ensityof therain .In
th eÅ position,therain sensor ismor e
sen sitive than intheÄ position,caus ing
th ewind shieldwiper sto wipe more
fr equen tly. Swit
ching therea rwindow wiperon/
off Combin
ationswitch
: è Rearwindow wiperswitch
2 b Towipe withwasher fluid
3 ° Toswitc hon intermit tentwiping
7 Rain sensorset tolow sens itivity.
8 Rain sensorset tohigh sensitivity. 118
Wind
shield wipersLights and windshield wipers

4
e Toswitch offinter mittentwiping
5 b Towipe withwasher fluid
X Turn theSmart Keytoposition 1or 2in the
ignition lock.
X Slide switch :onthe combinat ionswitch
up ordown tothe appropriate position.
When therear window wiperisswitched on,
the icon appears inthe instr ument cluster. Replacing
thewiper blades
Impor tantsafety notes G
WARNIN
G For
safety reasons, switchoffthe windshield
wipers andremove thekey from theignition
lock before changin gthe wiper blades
(vehicles withKEYLE SS-GO: make surethat
the on-board electronicsare instate 0).
Otherwise, thewiper motor couldbeswitched
on suddenly andcause injury.
! Toavoid damaging thewiper blades,
make surethatyoutouch onlythewiper
arm ofthe wiper.
! Never openthehood ifawindshield wiper
arm hasbeen folded awayfromthe
windshield.
Never foldawindshield wiperarmwithout
a wiper bladebackontothe windshield/
rear window.
Hold thewindshield wiperarmfirmly when
you change thewiper blade. Ifyou release
the windshield wiperarmwithout awiper
blade anditfalls ontothe windshield, the
windshield maybedamaged bythe force of
the impact.
Mercedes- Benzrecomm endsthatyouhave
the wiper blades replaced byaq ualifi ed
spec ialist workshop,e.g. at an auth orized
Mer cedes- BenzCent er. Changing
thewindshield wiperblades Removing
thewiper blades
X Remove theSmart Keyfrom theignition
lock.
X Fold thewiper armaway fromthe
windshield. X
Firmly pressrelease knob : and pullthe
wiper bladeupwards fromthewiper armin
the direct ionofthe arrow.
Installing thewiper blades
X Position thenew wiper bladeinthe retain er
on the wiper armandslide itint oplace in
the opposite directiontothe arrow.
The wiper bladeaudibly engages.
X Make surethatwiper bladeisseated
corr ectly.
X Fold thewiper armback ontothe
windshield.
Repla cingtherear window wiperblade Removing
thewiper blade G
WARN
ING The
wiper armcould beset inmotion and
injur eyou ifthe wiper isswitch edon.
Remove thekey from theignition lockbefore
replacing thewiper blade. Windsh
ieldwipers
119Lights and windshield wipers Z

X
Remo vetheSm artKey from theign ition
loc k.
X Fo ldwiper arm:away from therear
win dow untilit en gage s.
X Pos ition wiper blade;atarig ht ang leto
wiper arm:.
X Ho ldwiper arm:and presswiper
blade ;inthedir ection ofthearr ow until
it rel ease s.
X Remo vewiper blade;.
Inst alling thewipe rblad e
X Place newwiper blade;ontowiper
arm :.
X Hold wiper arm:and press wiper
blade ;inthe opposit edirec tiontothe
arrow untilit engage s.
X Make surethatwiper blade;isseated
cor rectly.
X Posit ionwiper blade;parallel towiper
arm :.
X Fold wiper arm:back ontothe rear
window. Problem
swith thewindshield wipers
Th ewindshield wipersareobstr ucted Leaves
orsno w,for examp le,may be
obst ructingthe windsh ieldwiper movement.
The wiper motorhas been deact ivated . X
For safet yreason s,you should removethe
Smar tKey from theignit ionlock .
or
X Swit choff the engin eusing theStart/ Stop
butt onand open thedriver 'sdoor.
X Remove thecause ofthe obst ruction.
X Swit chthe windsh ieldwipers backon.
Th ewindshield wipersareinoper ative The
windsh ieldwiper driveismalfun ctionin g.
X Selec tanothe rwiper speed onthe
com binat ionswitc h.
X Have thewinds hieldwipers checkedata
qualified specialist workshop.
Th espr aynozz lesaremisa ligned The
winds hieldwasher fluidfromt hespray
nozz lesnolonger hitsthecent erofthe
windshield. Thespray nozzlesare misaligned.
X Have thespray nozzlesadjusted ata
qual ified specialist workshop. 120
Windshield
wipersLights and windshield wipers

=
Directs theairfl ow thro ughthe rearai rvents
? Directs theairfl ow thro ught he footwell vents Notes
onusing climate control
The following contains notes and
recommen dationsonoptimum operation of
dual -zoneautomatic climatecontrol.
R Act ivate climate controlusing theà and
¿/Á buttons.Theindicator lampsin
the à and¿/Á buttonslightup.
R Set thetemperature to72 ‡(22 †).
R Only usethe"defrosting" functionbriefly
until thewindshield isclear again.
R Only use"air-recirculation" modebriefly,
e.g. ifthere areunpleasa ntoutside odors
or when inatunn el.The windows could
otherwise fogupas, inair-recirculation
mode, nofresh airisdrawn intothevehicle.
R Use theZONE functiontoadopt the
temperature settingson the driver's side
for the front -passenger sideaswell. The
indicator lampinthe á button goesout. Overview
ofclimate controlsystems
125Climate control Z

Note
son using 3-zo neauto matic
cl imate contro l
Th efol lowi ng conta insnote sand
rec omm endations onoptim um opera tiono f
auto maticclim atecontrol.
R Ac tivate clim atecontrol usin gth eà and
¿ buttons .T he indicator lampsinthe
à and¿ buttons lightup.
R In automatic mode,youcan also usethe
ñ button toset aclimate mode
(FOCUS/ME DIUM/DIFFUSE). The
MEDI UMlevel isrecommen ded.
R Set thetemperature to72 ‡(22 †).
R Only usethe"defrosting" functionbriefly
until thewindshield isclear again.
R Only use"air-recirculation" modebriefly,
e.g. ifthere areunpleasa ntoutside odors
or when inatunn el.The windows could
otherwise fogupas, inair-recirculation
mode, nofresh airisdrawn intothevehicle.
R Use theZONE functiontoadopt the
temperature settingson the driver's side
for the front -passenger sideandtherear
compartmen taswell .The indicator lampin
the á button goesout.
R Use theresidual heatfunct ionifyou want
to heat orvent ilate thevehicle interior
when theignition isswitched off.The
"residu alheat" functioncan only be
activated ordeactivated withtheignition
switched off. Operat
ingthe climate controlsystem Activating/deactivating
climate
control
Import antinformat ion G
WARNING When
theclimate controlsystem is
deactivated, theoutside airsupply and
circulation arealso deactivated. Onlychoose
this settin gfor ashort time.Otherwise the windows
couldfogup,impairing visibilityand
endangering youand others. i
Switch
onclimate controlprimarily using
the à button (Ypage 129).
In the rear compartmen t,you can also switch
climate controlonand offusing theà and
^ buttons.
Activating/deactivating X
Turn theSmartK eytoposition 2in the
ignition lock.
X To switch on:press theà button.
The indicator lampinthe à button lights
up. Airflow andairdistribution aresetto
automatic mode.
or
X Press the^ button.
The indicator lampinthe ^ button goes
out. Thepreviously selectedsettingscome
into effect again.
X To switch off:press the^ button.
The indicator lampinthe ^ button lights
up. Activating/deactivating
thecool ing
with airdehum idification function
Import antinformat ion The
cooling withairdehumidi ficationfunction
is only availa blewhen theengine isrunning.
The airinside thevehicle iscooled and
dehumidi fiedaccording tothe temperature
selected. G
WARNING If
you switch offthe cooling function,the
vehicle willnotbecooled whenweather
condition sare warm. Thewindows canfogup
more quickly. Window foggingmayimpair
visibili tyand endanger youand others.
Condensation maydripfrom theunderside of
the vehicle whenitis in cooling mode.Thisis 128
Operat
ingthe climate controlsystemClimate control

norm
aland notasign tha tther eis a
ma lfunctio n. i
The
cooling with aird ehumidification
func tion uses refriger antR134a. This
coolant doesnotcontain
chlorof luorocarbon s,and therefore does
not damage theozon elayer.
Activating/d eactivating X
To activa te:press the¿/Á button.
The indicat orlamp inthe ¿/Á
button lightsup.
X To deactiva te:press the¿/Á
button .
The indicat orlamp inthe ¿/Á
button goesout.Thecooling withair
dehumidification function hasadelayed
switch -offfeature.
Problems withthecooling withair
dehum idificat ionfunction When
youpress the¿/Á button,the
indicat orlamp inthe button flashes three
times orremains off.You cannolonger switch
on the cooling withairdehumidification
func tion.
X Consult aqualified specialist workshop. Sett
ingclimat econtrol toaut omat ic G
WARN
ING If
you switch offthe cooling function,the
vehicle willnotbecooled whenweather
con ditions arewarm. Thewindows canfogup
more quickly. Window foggingmayimpair
visibility andendanger youand other s.
In automatic mode,thesettemper atureis
maint ained automatic allyatacon stan tlevel.
The system automatic allyregulates the
temper atureofthe dispensed air,the airflow
and theairdistribut ion.
Autom aticmode willachieve optimal
operation ifcooling withairdehumidification is
also activat ed.Ifdesired, coolingwithair
dehumidification canbedeactivat ed.
In the rear compart ment,you can also switch
climate control forthe rear seats toautomatic
mode usingtheà button .
X Turn theSmart Keytoposition 2in the
ignition lock.
X Set thedesired temperature.
X To activa te:press theà button .
The indicat orlamp inthe à button lights
up. Autom aticairdistribut ionand airflow
are activ ated. i
Autom
aticclimate control: when
automatic modeisactivat ed,you can
select aclimate modesetting
(Y page 129).
X To switch off:press the_ button .
or
X Press theI orK button .
The indicat orlamp inthe à button goes
out. Adju
sting theclimat emode settings
(AIR FLOW)
This function isonly available withautomatic
climate control.
The climate control settings areespecially
effec tiveathigh temper atures.
You canselect thefollowing climatecontrol
sett ings inautomatic mode:
FOCUS highairflow thatisset slightly
cooler
MED IUM medium airflow,standard setting
DIF FUS Elow airflow thatisset slightly
warmer andwith alower rateof
airflow Opera
tingtheclimate controlsystem
129Climate control Z

Rear
control panel:
M Directsthe airflo wthrou ghthe rear
center andrearsid eairvents.
O Directsthe airflo wthrou ghthe
footw ellai rv ent s i
Using
therear control panel, youcan also
activat eboth airdistribut ionposition s
simultaneously. Inorder todo this, press
both airdistribut ionbutton s.The airisthen
routed through allrear airvent s. i
Regardless
ofthe airdistribut ionsett ing,
airflow isalway sdirect edthrough theside
air vent s.The side airvent scan only be
closed whenthecontrols onthe side air
vent sare turn eddownwards.
X Turn theSmart Keytoposition 2in the
ignition lock.
X Front control panel:pressthe_
button repeatedly untilthedesired symbol
appears inthe display.
X Rear control panel:presstheM and/
or O button . Sett
ingthe airflow
X Turn theSmart Keytoposition 2in the
ignition lock.
X To increase: presstheK button .
X To redu ce:press theI button . i
You
canuseautomatic climatecontrol to
set the airflow inthe rear compart ment
separately. Switching
theZONE function on/off
X To switch on:press theá button .
The indicat orlamp inthe á button lights
up.
Dual-z oneautomatic climatecontrol: the
temper aturesettingforthe driver's sideis not
adopted forthe fron t-passenger side.
The temper atureofthe fron t-passenger
side isadopted forthe rear compart ment.
Autom aticclimate control: the
temper aturesettingforthe driver's sideis
not adopted forthe fron t-passenger side
and therear compart ment.
When thebutton sor con trols for
temper ature,airflow orair distribut ionare
activat ed,the temper aturesettingforthe
driver's sideisnot adopted forthe other
climate control zones.
X To switch off:press theá button .
The indicat orlamp inthe á button goes
out.
The temper aturesettingforthe driver's
side isadopted forthe fron t-passenger side
and therear compart ment. Defrosting
thewindshield
You canusethis func tion todefrost the
windshield ortodefrost theinside ofthe
windshield andtheside windows. i
You
should onlyselect thedefrost ing
func tion until thewindshield isclear again.
X Turn theSmart Keytoposition 2in the
ignition lock.
X To activa te:press the¬ button .
The indicat orlamp inthe ¬ button lights
up.
The climate control system switchestothe
following functions:
R cooling withairdehumidification on11
R high airflow 12
R high temper ature12
R air distribut iontothe windshield and
fron tside windows
R air-r ecirculat ionmode off
11 Only withenginerunn ing.
12 Depe ndingon the outs idetem perat ure. Oper
ating theclima tecontr olsyst em
131Climate control Z

X
To switchof f:pre ssthe ¬ button.
The indicator lamp inthe ¬ button goes
ou t.The previouslysel ecte dsettings come
int oeffec tagain. Thecooling withair
dehumidification functionremains on.Air-
recirculation moderemains deactivated.
or
X Press theà button .
The indicator lampinthe ¬ button goes
out. Airflow andairdistribution aresetto
automatic mode.
or
X Turn controls:orB clock wiseor
count er-clockwise (Ypage 123),
(Y page 123).
or
X Press theK orI button . Switching
maximumcool ingMAX
COOL on/off
The MAX COOL functionisonly availa blein
vehicles forthe USA .
MAX COOL isonly operational whenthe
engine isrunnin g.
When youactivate MAXCOOL, climate
cont rolswitches tothe following functions:
R maximum cooling
R maximum airflow
R air-recirc ulationmodeon
X To activat e:press theÙ button .
The indicator lampinthe button lightsup.
X To deactivat e:press theÙ button
again.
The indicator lampgoesout.Thepreviously
selected settings come intoeffect again. Defrosting
thewindows
Windows foggeduponthe inside X
Act ivate the¿/Á coolingwithair
dehumidification function.
X Act ivate automatic modeÃ.
X Ifthe windows continue tofog up,activate
the defrostin gfunct ion(Ypage 131). i
You
should onlyselect thissettinguntil
the windshield isclear again.
Windows foggeduponthe outside X
Act ivate thewindshield wipers.
X Press the_ button repeatedly untilthe
P orO symbol appears inthe
display . i
You
should onlyselect thissettinguntil
the windshield isclear again. Rear
window defroster
Activating/deactivat ing G
WARNING Any
accumulation ofsnow andiceshould be
removed fromtherear window beforedriving.
Visibility couldotherwise beimpaired,
endangering youand others.
The rear window defroster hasahigh current
draw. Youshould therefor eswitch itoff as
soon asthe window isclear asitonly switches
off automatically afterseveral minutes.
If the battery voltage istoo low, therear
window defroster mayswitch off.
X Turn theSmart Keytoposition 2in the
ignition lock.
X Press the¤ button .
The indicator lampinthe ¤ button lights
up orgoes out. 132
Opera
tingtheclimate controlsystemClimate control

Problems
withtherear window
defroster The
rear window defroster hasdeactivated
itself prematurely orcannot beactivated.
X Switch offany consumers thatarenot
required, e.g.reading lampsorinterior
lighting.
When thebattery issufficiently charged,
the rear window defroster isactivated
again automatically. Activating/deactivating
air-
recirculation mode
You candeactivate theflow offresh airif
unpleasant odorsareenterin gthe vehicle
from outside. Theairalready insidethe
vehicle willthen berecirculated.
The operation ofair-recirculation modeisthe
same forallcont rolpanels. G
WARNING Fogged
windows impairvisibility,
endangering youand others. Ifthe windows
begin tofog onthe inside, switching offthe
air recirculation modeimmediately should
clear interior window fogging. Ifinterior
window foggingpersists, makesuretheair
condition ingisactivated, orpress the¬
button.
X Turn theSmartK eytoposition 2in the
ignition lock.
X To activate: pressthed button.
The indicator lampinthe d button lights
up. i
In
the event ofhigh pollu tionlevels 13
or at
high outside temperatures, air-
recirculation modeisautomatically
activated. Whenair-recirculation modeis
activated automatically ,the indicator lamp
in the d button isnot lit.
Outside airisadded afterabout 30
minutes. X
To switch off:press thed button.
The indicator lampinthe d button goes
out. i Air-r
ecirculation modedeactivates
automatically :
R after approximately fiveminutes if
outside temperatures areless than about
41 ‡(5 †)
R after approximately fiveminutes if
cooling withairdehumidi ficationis
deactivated
R after approximately 30minutes ifoutside
temperatures areover about
41 ‡(5 †)
R ifyou press the¿/Á buttonand
switch oncooling withair
dehumidi fication Activating/deactivating
theresidual
heat function
The residual heatfunct ionisonly availa blein
Canada
It is possible tomake useofthe residual heat
of the engine tocont inue heating the
stationary vehicleforupto30 minutes after
the engine hasbeen switched off.The heating
time depends onthe temperature thathas
been set. i
The
blower willrun atalow speed
regardless ofthe airflow setting. i
If
you activate theresidual heatfunct ion
at high temperatures, onlythevent ilation
will beactivated. Theblower runsat
medium speed.
X Turn theSmartK eytoposition 0in the
ignition lockorremove it.
X To activate: presstheÌ/Á button.
The indicator lampinthe Ì/Á
button lightsup.
13 Automatic climatecontrolonly. Operat
ingthe climate controlsystem
133Climate control Z