workshop MERCEDES-BENZ M-Class 2012 W166 User Guide

Opera
tingthesliding sunroof
Opening andclosing i
You
cancontinue tooperate thesliding
sunroof afterswitchin goff the engin eor
removin gthe Smart Keyfrom theignition
lock. Thisfunctionisavailable foruptofive
minut esoruntil thedriver's orfron t-
passenger doorisopened. Overhead
control panel
: Toraise
; Toopen
= Toclose/lower
X Turn theSmart Keytoposition 1or 2in the
ignition lock.
X Press orpull the2 switch inthe
corr espondin gdirect ion. i
If
you press the2 switch beyond the
point ofresist ance, anautomatic opening/
closing process isstart edinthe
corr espondin gdirect ion.You canstop
automatic operationbyoperatin gthe
switch again.
When opening andraising theroof,
automatic operationisonly available ifthe
sliding sunroof isin the closed position .
The sunprotec tioncover automatic allyopens
along withthesliding sunroof .You can open
or close thesun protec tioncover manually
when thesliding sunroof israised orclosed. Resetting Reset
thesliding sunroof ifit does notmove
smoothly.
X Turn theSmart Keytoposition 1or 2in the
ignition lock.
X Raise thesliding sunroof fullyatthe rear
(Y page 89).
X Keep the2 switch pressed foranother
second.
X Make surethatthesliding sunroof canbe
fully opened andclosed again(Ypage 89).
X Ifthis isnot thecase, repeat thesteps
above again.
! Ifthe sliding sunroof stillcann otbe
opened orclosed fullyafter resett ing,
cont actaquali fiedspecialist workshop. Operat
ingthe panora maroof with
power tilt/sliding panel
Opening andclosin g Overhead
controlpanel
: Toraise
; Toopen
= Toclose/lower
The panorama roofwith power tilt/sliding
panel canonly beoperated whentheroller
sunblind isopen.
X Turn theSmart Keytoposition 1or 2in the
ignition lock.
X Push orpull the2 switch inthe
correspon dingdirection . Sliding
sunroof
89Opening/closing Z

i
If
you press the2 switch beyond the
point ofresistance, anautoma ticopening/
closing process isstarted inthe
corresponding direction.Youcanstop
automa ticopera tionbyopera tingthe
switch again.
When raisingthe roof, automa ticopera tion
is only availableifthe sliding sunroof isin
the closed position. Operating
thesunbli ndsforthe
panorama roofwith powe rtilt/slid ing
pa nel
Gener alnotes The
roller sunblin dsshield thevehic leint erior
from sunligh t.The two roller sunblin dscan
only beopen edand close dtog eth erwhen the
panor amaroofwith power tilt/slidin gpanel
is close d. G
WARN
ING When
extendin gthe roller sunblin ds,make
sure noone isin danger ofbeing injured by
the extendin gproc edure. Theextendin gof the
roller sunblin dscan beimmediat elyhalted by
releasin gthe switc h.
Opening andclosing Over
head control panel
: Toraise
; Toopen
= Toclose X
Turn theSmar tKey toposit ion1or 2in the
ignit ionlock .
X Press orpull the2 switchin the
cor respo ndingdirec tion. i
If
you press the2 switchbeyond the
point ofresist ance,an automat icopen ing/
closin gproc essisstar ted inthe
cor respon dingdirec tion.You can stop
automatic operationbyoperating the
switch again.
Resetting thepanora maroof with
power tilt/sliding panelandtheroller
sunblinds Reset
thepanorama roofwith power tilt/
sliding panelandtheroller sunblinds ifthe
panorama roofwith power tilt/sliding panel
or the roller sunblinds donot move smoothly.
X Turn theSmart Keytoposition 1or 2in the
ignition lock.
X Pull the2 switch repeatedly tothe point
of resistanc ein the direction ofarrow =
until thepanorama roofwith power tilt/
sliding panelisfully closed.
X Keep switch 2pulled foranadditional
second.
X Pull the2 switch repeatedly tothe point
of resistanc ein the direction ofarrow =
until theroller sunblinds arefully closed.
X Keep switch 2pulled foranadditional
second.
X Make surethatthepanorama roofwith
power tilt/sliding panel(Ypage 89)and the
roller sunblinds (Ypage 90)can befully
opened again.
X Ifthis isnot thecase, repeat thesteps
above again.
! Ifthe panorama roofwith power tilt/
sliding panelandtheroller sunblind cannot
be fully opened orclosed afterresett ing,
cont actaquali fiedspecialist workshop. 90
Sliding
sunroofOpening/closing

Problems
withthesliding sunroof
Your vehicle maybeequipp edwith asliding
sunroof orapanorama roofwith power tilt/
sliding panel.Inthe following section,the
term "slidingsunroof" referstoboth types of
sliding sunroof.
Problem: thesunroof cannotbeclose d
and youcannot seethecause. G
WARNING You
could beseverely oreven fatally injured
when closing thesliding sunroof with
increased closingforceorifthe anti-
entr apment featureisdeactivated. Makesure
that nobody canbecome trappedwhen
closing thesliding sunroof.
If the sliding sunroof isobstruct edduring
closing andreopens againslightly:
X Immediately afterthesliding sunroof
blocks, pullthe2 switch inthe
overhead controlpanel downtothe point
of resistance andhold ituntil thesliding
sunroof isclosed.
The sliding sunroof isclosed withincreased
force.
If the sliding sunroof isobstruct edagain
during closing andreopens againslightly:
X Immediately afterthesliding sunroof
blocks, pullthe2 switch inthe
overhead controlpanel downtothe point
of resistance andhold ituntil thesliding
sunroof isclosed.
The sliding sunroof isclosed without the
anti-en trapment feature. G
WARNING Pressing
andholding thesliding sunroof
switch toclose thesliding sunroof
immediately afterithad been blocked two
times willcause thesliding sunroof toclose
without theanti-en trapment featureforas
long asyou hold theswitch.
! Ifthe sliding sunroof stillcannot be
opened orclosed asaresult ofa malfunction
,cont actaqual ified specialist
workshop. Sliding
sunroof
91Opening/closing Z

Useful
information
i This
Operat or'sManual describesall
models andallstan dard andoption al
equipment ofyour vehicle available atthe
time ofpublication ofthe Operat or's
Manual. Country-specificdiffer encesare
possible. Pleasenotethat your vehicle may
not beequipped withallfeature s
descr ibed. Thisalso applies tosafet y-
related systemsand func tions. i
Please
readtheinfor mation onqualified
specialist workshops(Ypage 25). Correct
driver's seatposition Observ
ethe safet yguidelines onseat
adjust ment(Ypage 95).
X Check whether youhave adjust edseat =
properly.
Elec tricalseat adjust ment(Ypage 96)
When adjustingthe seat, make sure:
R you areasfar away fromthedriver' sair
bag aspossible.
R you aresitting inanor mal upright
position .
R you can faste nthe seat beltproperly. R
you have moved thebackrest toan
almost vertical position.
R you have setthe seat cushion angleso
that your thighs aregently supported.
R you can depress thepedals properly.
X Check whether thehead restraint is
adjusted properly(Ypage 97).
When doingso,make surethatyouhave
adjusted thehead restraint sothat theback
of your head issupported ateye level by
the cent erofthe head restraint .Also mak e
sure thatthehead restraint 'sfor e/af t
posit ionisadjust edsothat thehead
rest raint isnot too farfromt heback ofyour
head.
Observe thesafety guidelinesonsteering
wheel adjustment (Ypage 100).
X Check whether steeringwheel:is
adjusted properly.
Adjustin gthe steering wheelmanually
(Y page 101)
Adjustin gthe steering wheelelectrically
(Y page 101)
When adjusting thesteering wheel,make
sure:
R you can hold thesteering wheelwithyour
arms slightly bent.
R you can move yourlegsfreely.
R you can seeallthe displa ysinthe
instrumen tcluste rclearly.
Obser vethe safet yguideline sfor seat belts
(Y page 49).
X Check whetheryou have fastened seat
belt ;proper ly(Y page 51).
The seat beltshould:
R fit snug lyacro ssyour body
R be rout edacro ssthe middle ofyour
shoulder
R be rout edinyour pelvic areaacrossthe
hip joints
X Bef ore start ing off,adjust therear- view
mirr orand theexterior mirrors 94
Corr
ectdriver' sseat posit ionSeats, steering wheel and mirrors

Useful
information
i This
Operat or'sManual describesall
models andallstan dard andoption al
equipment ofyour vehicle available atthe
time ofpublication ofthe Operat or's
Manual. Country-specificdiffer encesare
possible. Pleasenotethat your vehicle may
not beequipped withallfeature s
descr ibed. Thisalso applies tosafet y-
related systemsand func tions. i
Please
readtheinfor mation onqualified
specialist workshops(Ypage 25). Exter
iorlighting Impor
tant safet ynotes
For reason sof safet y,Merc edes-B enz
recom mends thatyoudrive withthelights
switc hedoneven during thedaytime. Insome
count ries,operation ofthe headlamps varies
due tolegal requiremen tsand self-imposed
obligation s. Inform
ation about driving abroad
Convert ingtosymm etrical low beam
when driving abroad: switc hthe headlamps
to symmet ricallowbeam incount riesin
which trafficdrives onthe opposite sideofthe
road tothe count rywhere thevehicle is
regist ered. Thispreven tsglare toonc oming
traf fic. Symmet ricallights donot illuminate
as large anarea ofthe edge ofthe road.
Have theheadlamps convert edataqualified
specialist workshop,e.g.anauthoriz ed
Merc edes-B enzCent er,asclose tothe border
as possible beforedrivingin thes ecount ries.
Convert ingtoasym metrical lowbeam
aft erret urn ing: have theheadlamps
con vert edback toasymmet ricallowbeam at
a qualified specialist workshop,e.g.an
authoriz edMerc edes-B enzCent er,assoon as
possible aftercrossing theborder again. Light
switch
Oper ation Depen
dingonthe date ofmanufac tureofyour
vehicle, thec orà symbol forthe
automat icheadlamp mode/dayt imerunn ing
lamps islocate don the light switc h. Illustr
ation:light switc hwith theà symbol for
the automat icheadlamp mode/daytime running
lamps
1W Left-han dstan ding lamps
2X Right-handstanding lamps
3T Parkinglamps, licenseplate and
inst rumen tcluste rlight ing
4Ã Automat icheadlamp mode/daytime
runn inglamps
5L Low-beam/ high-beam headlamps
BR Rearfoglamp Illust
ration: light switc hwith thec symbol for
the autom aticheadlamp mode/daytimerunn ing
lamps
1W Left-han dstandin glamps
2X Right-handstandin glamps 108
Exter
iorlight ingLights and windshield wipers

The
system cannotrecogn izethe following
road users:
R Road users without alighting systemof
their own, e.g.pedestrians
R Road users withdimlighting oftheir own,
e.g. cyclists
R Road users whose lighting isobstruct ed,
e.g. road users behind aguardrail
R Insome seldom cases,evenroadusers with
a lighting systemoftheir ownmay be
recogn izedtoolate ornot atall.
The automatic high-beam headlamps willthen
not bedeactivated oritwill beactivated in
spite ofpreceding oroncom ingroad users.
This could endanger youand/or othersand
cause anaccident .Always payclos eatt ent ion
to the traffic situat ionand switc hoff the high
beam manually ifnec essary. Head
lampsfogged upontheinside
The headlamps mayfogupon the inside if
the reishigh atmo spher ichumidit y.
X Dr ive with theheadlamps switchedon.
The level ofmoist uredimin ishes,
depen dingonthe lengt hof the jour ney and
the weather condition s(humidit yand
tem perat ure).
If the level ofmoist uredoes notdimin ish:
X Have theheadlamps checkedataqualified
spec ialist workshop. Inter
iorlight ing Over
view ofinter iorlight ing Over
head control panel
: p Toswitc hthe left-han dfro ntreadin g
lamp on/off
; c Toswitc hthe frontinterior lighting
on
= v Toswitc hthe rear interior lighting
on/ off
? | Toswitc hthe frontint erior lighting/
autom aticinterior lightingcon trol off
A p Toswitc hthe right -handfront
read inglamp on/off
B Toswi tch the automatic interiorlighting
control on Inte
rior lighting control
Important notes In
order toprevent thevehicl e'sbattery from
discha rging,theinterior lighting functions are
au tomatical lydea ctivated aftersome time
except forwhen theSmartKey isin posi tion
2 in the ignitio nlock.
The color andbrigh tness ofthe ambi ent
lig hting maybeset using the on-board
computer (Ypag e234).
Automatic interiorlight ingcontr ol X
To switch on:setthe rocker switc hto
cen terposit ionB. Inter
iorlight ing
113Lights and windshield wipers Z

X
To switcho ff:set the rocker switch tothe
| position.
The interior lighting automatical lyswitches
on ifyou :
R unlock thevehicl e
R open adoor
R remove theSmartKey fromtheignitio nlock
The interior lightisactivated forashort while
when theSmart Keyisremoved fromthe
ignition lock.Youcanactivate thisdelay ed
switch- offusing theon-board computer
(Y page 235).
Manua linterior lighting control X
To switch thefront interior lighting on:
set the rock erswitch tothe c position.
X To switch thefront interior lighting off:
set the rock erswitch tothe | position.
X To switch therear interior lighting on/
off: press theu button .
X To switch thereading lampson/off:
press thep button . Crash-
responsive emergency lighting
The interior lighting isactivated automatically
if the vehicle isinvolved inan accident .
X To switch offthe crash- responsive
emergency lighting:pressthehazard
warning lampbutton .
or
X Lock andthen unlock thevehicle usingthe
Smart Key. Replacing
bulbs Import
antsafety notes
Xenon bulbs If
your vehicle isequipped withXenon bulbs,
you can recogn izethis bythe following: the
cone oflight from theXenon bulbsmoves
from thetop tothe bottom andback again when
youstart theengine. Forthis tobe
observed, thelights mustbeswitched on
before startingthe engine. G
DANGER Xenon
bulbscarryahigh voltage. Youcould
get anelectric shockandbeseriously oreven
fatally injured ifyou touch theelectric
cont acts onXenon bulbs.Therefore, never
remove thecover fromXenon bulbs.
Do not change Xenonbulbsyourself, buthave
them replaced ataquali fiedspecialist
workshop whichhasthenecessary specialist
knowledge andtools tocarry outthework
required.
Mercedes-B enzrecommen dsthat youusean
authorized Mercedes-B enzCenter forthis
purpose. Inparticular, workrelevant tosafety
or on safety-related systemsmustbecarried
out ataquali fiedspecialist workshop.
Bulbs andlamps areanimportant aspectof
vehicle safety.Youmust therefor emake sure
that these functioncorrec tlyatall times.
Have theheadlamp settingcheck edregularly .
Other bulbs There
arebulbs otherthantheXenon bulbs
that youcann otreplace. Replaceonly the
bulbs listed (Ypage 115). Havethebulbs that
you cann otreplace yourself changed ata
quali fiedspecialist workshop.
Mercedes-B enzrecomm endsthatyouusean
authorized Mercedes-B enzCenter forthis
purpose. Inparticular, workrelevant tosafety
or on safety-related systemsmustbecarried
out ataquali fiedspecialist workshop.
If you require assistance changingbulbs,
consult aquali fiedspecialist workshop.
Do not touch theglass tubeofnew bulbs with
your bare hands. Evenminor contamination
can burn intotheglass surface andreduce
the service lifeofthe bulbs. Always usealint-
free cloth oronly touch thebase ofthe bulb
when installing.
Only usebulbs ofthe correc ttype. 114
Rep
lacingbul bsLights an dwindshield wipers

If
the new bulbstill does notlightup,con sult
a qualified specialist workshop.
Bulbs andlamps areanimport antaspect of
vehicle safety.Youmust therefore make sure
that these function correctlyat all times .
Have theheadlamp settingchec kedregularly. G
WARN
ING Bulbs
andlamps canbevery hot.Youshould
ther efore allowthemtocool down before you
chang ethem .Othe rwise, yo ucou ldbe burned
if yo utou chthe m.
Kee pbu lbsou to fthe reach ofchildren.
Otherwise, theycould damage thebulbs, for
example, andinjure themselves.
Never useabulb which hasbeen dropped.
Such abulb maybreak oreven explode and
injure you.
Halogen bulbsarepressurized andcan
explode whenyouchange them,particularly
if they arevery hot.Youshould therefore wear
eye protect ionand gloves whenyouare
changing them. Overview:
changingbulbs/bulb types
You canchange thefollowing bulbs.Thebulb
type canbefound inthe legend. Halogen
headlamps
: Low-beam headlamp:H755W
; High-beam headlamp:H755W
= Parking lamp/standing lamp:W5W BV
? Side marker lamp:WY5W Tail
lamp
: Brake lamp:P21 W-L Changing
thefront bulbs
Removing andinstalling thecover inthe
front wheel arch You
must remove thecover fromthefront
wheel housing beforeyoucan change the
front bulbs. X
To remove: switchoffthe lights.
X Turn thefront wheels inwards.
X Slide upcover :and liftitout.
X To install: insertcover:again andslide
it downwards untilitengages. Replacing
bulbs
115Lights and windshield wipers Z

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