engine MERCEDES-BENZ M-Class 2012 W166 Owner's Guide

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

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

X
To dea ctivate :pre ssthe Ì/Á
bu tton.
The indicator lamp inthe Ì/Á
bu tton goesou t. i Re
sidu alhea tisdeactivated
automaticall y:
R after about30 minutes
R when theignition isswitched on
R ifthe battery voltage drops
R ifthe coolant temperature istoo low Setting
theairvents Importa
ntsafety notes G
WARNING When
operating theclimate control,the air
that enters thepassenger compartment
through theairvents canbevery hotorvery
cold (depending onthe settemperature). This
could cause burnsorfrostbite tounprotected
skin inthe immediate areaofthe airvents.
Always keepsufficient distancebetween
unprotected partsofthe body andtheair
vents. Ifnecessary, usetheairdistribution
adjustment todirect theairtoair vents inthe
vehicle interior thatarenot inthe immediate
area ofunprotected skin.
In order toensure thedirect flowoffresh air
through theairvents intothevehicle interior,
please observe thefollowi ngnotes:
R keep theairinlet grille onthe hood andin
the engine compartment onthe front -
passenger sidefreeofblockages, suchas
ice, snow orleaves.
R never covertheairvents orair intake grills
in the vehicle interior. i
For
virtually draft-free ventilation, adjust
the sliders ofthe airvents tothe cent er
position. Setting
thecenter airvents :
Center airvent, left
; Center airvent, right
= Center ventthumbwheel, right
? Center ventthumbwheel, left
X To open/c lose:turnthumbwheels =
and ?tothe right orleft. Setting
theside airvents X
To open/c lose:turn thumbwheel =upor
down. Setting
theglove boxairvent
When automatic climatecontrolisactivated,
the glove boxcanbecooled, forinstance to
cool itscont ents. Thelevel ofairflow depends
on the airflow andairdistribution settings.
At high outside temperatures, opentheair
vent andactivate the"cooling withair
dehumid ification" function. 134
Setting
theairventsClimate control

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). Br
eaking-in notes The
first 1000 miles (1500 km)
The more youlook after theengin ewhen itis
new, themore satisfiedyou willbewith its
perfor mancein the future.
R Driv eat varying vehiclespeeds andengin e
speeds forthe first 1000miles (1500km)
for this reason .
R Avo idovers trainingthe vehicle duringthis
period, e.g.drivin gat full throttle.
R Change gearingood time, atthe latest
when thetach omet erneedle is⅔o fthe
way tothe red area inthe tachomet er
displa y.
R Do not manually shifttoalower gearto
brake thevehicle.
R Only select shiftranges 3,2or 1when
driving slowly,e.g. inmountainous terrain.
Aft er1000 miles(1500 km),you can increase
the engine speedgraduall yand bring the
vehicle uptofull speed. i
You
should alsoobserve thesenoteson
runnin gin ifthe engine orparts ofthe drive
train onyour vehicle havebeen replaced. i
Always
observe therespect ivespeed
restr iction s. Driving
Import
antsafety notes G
WARNIN
G Make
sureabsolutely noobject sare
obstruct ingthe pedals' rangeofmovemen t.
Keep thedriver's footwell clearofall
obstacles. Ifthere areany floormats or
carpets inthe footwell, makesurethepedals
still have sufficient clearance.
During sudden drivingorbraking maneuvers
the object scould getcaught between the
pedals. Youcould thennolonger brakeor
accelerate. Thiscould leadtoaccident sand
injury. G
WARNIN
G On
slippery roadsurfaces, neverdownshift in
order toobtain braking action.Thiscould
result indrive wheel slipand reduced vehicle
cont rol.Your vehicle's ABSwillnotprevent
this type ofloss ofcont rol. G
WARNIN
G It
is dangerous toshift theautomatic
transm issionoutofparking position Por
neutral position Nifthe engine speedis
higher thanidlespeed. Ifyour footisnot firmly
on the brake pedal, thevehicle could
accelerate quicklyforward orinreverse. You
could losecontrolofthe vehicle andhit
someone orsomethin g.Only shiftintogear
when theengine isidling normally andwhen
your right footisfirmly onthe brake pedal.
! Warm upthe engine quickly. Donot use
the engine's fullperformanc euntil ithas
reached operating temperature.
Only shifttheautomatic transmission to
the desired driveposition whenthevehicle
is station ary.
Where possible, avoidspinnin gthe drive
wheels whenpulling awayonslippery
roads. Youcould otherwise damagethe
drive train. 138
DrivingDriving and parking

Smar
tKeypositions
Smar tKey g
Toremove theSmartK ey
1 Power supply forsome consumers, such
as the windshield wipers
2 Ignition (powersupplyforallconsumers)
and drive position
3 Tostart theengine
As soon asthe ignition isswitched on,allthe
indicator lampsinthe instrumen tcluster light
up. Ifan indic atorlamp doesnotgoout after
the engineisstart ed orifit light sup while the
vehic leisin mot ion, see(Ypage 271).
If the SmartKey isin posit ion0in the ignit ion
lock foranext ende dperiod oftim e,itcan no
long erbe turned inthe ignit ionlock .The
steering isthen locked. Tounlock, remove the
SmartK eyand reinsert itinto theignition lock.
The steering islocked whenyouremove the
SmartK eyfrom theignition lock.
X Remove theSmartK eywhen theengine is
switched off.
The starter battery couldotherwise be
discharged.
If you cannot turntheSmartK eyinthe ignition
lock, thestarter battery maynotbecharged
sufficiently.
X Check thestarter battery andrecharge itif
necessary (Ypage 340).
or
X Jump-start thevehicle (Ypage 341). i
The
SmartK eycan beturned inthe
ignition lockeven ifit is not thecorrect
SmartK eyfor the vehicle. Theignition isnot
switched on.The engine cannot bestarted.
KEY LESS-GO General
informat ion
Vehicles withKEYLE SS-GO are equipp edwith
aS martKey featuringanintegrated KEYLESS-
GO function andadetacha bleStart/St op
button.
The Start/St opbutton mustbeinserted inthe
ignitio nlock andtheKEYLESS-GO keymust
be inthe vehicl e.
Pressi ngthe Start/St opbutton severaltimes
in successi oncorrespond sto the differe nt
SmartKey positions inthe ignitio nlock. This
is only thecase ifyou arenot depressing the
brake pedal.
If you depress thebrake pedalandpress the
Start /Stopbutton ,the engine starts
immediately.
The Start /Stopbutton canberemoved from
the ignition lock.Then, youcan insert the
Smart Keyinto theignition lock. i
You
donot have toremove theStart /Stop
button fromtheignition lockwhen you
leave thevehicle. However, youshould
alwa ystake theSmart Keywith youwhen
leaving thevehicle. Thevehicle canbe
start edwith theStart /Stopbutton andthe
electric alequipment canbeoperated while
the Smart Keyisin the vehicle. Driving
139Driving and parking Z

X
Insert Start/S topbutton :into ignition
lock ;. i
When
youinsert Start/S topbutton :
into ignition lock;,thesystem requiresa
detection timeofapp roximately two
seconds beforeyoucan useStart/S top
button :. Start/St
opbutton
= USA only
? Cana daonly
X Positio n0: ifStart/S topbutton :has not
yet been pressed ,this corresponds tothe
SmartKey beingremoved fromtheignition.
X Positio n1: press Start/S topbutton :
once.
You cannow activate thewindshi eld
wip ers, forexampl e. i
If
you press Start/S topbutton :twice
when inthis positio n,the powe rsupply is
deac tivat ed again .
X Pos ition 2(ign ition ):pre ssStart /S top
but ton: twice. i
If
you pressStart /S topbut ton: once
when inthis posi tion and thedriv er'sdoor
is open ,th epower supplyis deac tivat ed
again .
As soo nasthe ignition isswitched on,allthe
indicator lampsinthe instrument clusterlight
up. Ifan indicator lampdoesnotgoout after
the engine isstarted orifit lights upwhile the
vehicle isin motion, see(Ypage 271). Star
ting theengin e
Importa ntsafety notes G
WARNING Inhalation
ofexhaust gasishazardous toyour
health. Allexhaust gascont ains carbon
monoxide (CO),andinhaling itcan cause
unconsciousness andpossible death.
Do not run theengine inconfined areas(such
as agarage) whicharenot properly ventilated.
If you think thatexhaust gasfumes are
entering thevehicle whiledriving, havethe
cause determined andcorrect ed
immediately .Ify ou must driveunder these
condit ions,drive onlywith atleast one
window fullyopen atall times. i
Vehicles
withagasoline engine:the
catalytic converter preheats forupto30
seconds afteracold start.Durin gth is time,
th een gin esoun dmay bediff ere nt.
Aut oma tic trans mission X
Sh ift thetrans mis sion toposi tion P.
The trans mis sion position disp layinthe
mult ifunction disp laysho wsP
(Y page 145). i
You
canalso start theen gin ewhen the
tr ans mis sion isin posi tion N.
St artin gpr ocedu rewith theSm artKey X
To star tag asolineeng ine:turn the
SmartKey toposi tion 3in the ignition lock
(Y pag e139) andrelease itas soon asthe
engine isrunning.
X To start adiesel engine: turnthe
Smar tKey toposit ion2in the ignit ionlock
(Y page 139).
The % preglow indicatorlamp inthe
inst rumen tcluster lightsup.
X When the% preglo windic atorlamp
goes out,turnthe SmartK eytoposition 3
(Y page 139)andrelease itas soon asthe
engine isrunning. 140
DrivingDriving and parking

i
You
canstartthe engine without preglow
if the engine iswarm. i
You
canalso usethetouch-st artfunct ion.
To do this, turntheSmartK eytoposition 3
(Y page 139)andrelease itimmediately.
The engine thenstarts automatically .
Using KEYLESS-GO tostar tthe eng ine G
WARNING As
long asthe SmartKey isin you rvehicle, the
vehicle canbestart ed.Therefor e,never leave
children unattended inthe vehicle, asthey
could otherwiseacciden tallystart theengine.
When leaving thevehicle, alwaystake the
Smart Keywith youand lock thevehicle. Do
not leave children unattended inthe vehicle,
or with access toan unlock edvehicle. A
child's unsupervised accesstoavehicle could
result inan acciden tand/o rserious personal
injury. i
The
Start/ Stop button canbeused to
start thevehicle without insertingthe
Smart Keyintothe ignition lock.TheStart/
St op button mustbeinsert edinto the
ignition lockandtheSmart Keymust bein
the vehicle.
X Depress thebrake pedalandkeep it
depressed.
X To star tag asolineeng ine:press the
Start/Stop button(Ypag e139) once.
The engine starts.
X To start adiesel engine: presstheStart/
St op butt on(Ypage 139)onc e.
Preglow isact ivated andtheengin estar ts. Pulling
away
Autom atic transm ission G
WARN
ING It
is danger oustoshift theautomat ic
tr ansm ission outofparkin gposition Por
neutral position Nifthe engine speedis higher
thanidlespeed. Ifyour footisnot firmly
on the brake pedal, thevehicle could
accelerate quicklyforward orinreverse. You
could losecontrolofthe vehicle andhit
someone orsomethin g.Only shiftintogear
when theengine isidling normally andwhen
your right footisfirmly onthe brake pedal. i
It
is only possible toshift thetrans mission
from position Pto the desired position if
you depress thebrake pedal. Onlythenis
the parking lockreleased. Ifyou donot
depress thebrake pedal, youcan move the
DIRECT SELECT lever buttheparking lock
remains engaged.
X Depress thebrake pedalandkeep it
depressed.
X Shift thetrans mission toposition Dor R
(Y page 144).
X Relea sethe brake pedal.
X Carefully depresstheaccelerator pedal.
The electric parking brake(Ypage 156)is
automatically released.
The redF (USAonly)or! (Canada
only) indicator lampinthe instr ument
cluster goesout. i
The
vehicle lockscentrally once youhave
pulled away.The locking knobsinthe doors
drop down.
You canopen thedoors fromtheinside at
any time.
You canalso deactivate theautomatic
locking feature(Ypage 235). i
Upshifts
takeplace athigher engine
speeds afteracold start. Thishelps the
catalytic convertertoreach itsoperating
temperature morequickly.
Pulling awaywithatra iler To
ensure thatyoudonot rollbackwards
when pullingaway onanuphill slope, engage
the electric parking brake. Driving
141Driving and parking Z

X
Press andhold handle :.
The electr icparking brakecontinues to
brake andprevent thevehicle fromrolling
backwards.
The redF (USAonly)or! (Canada
only) indicator lampinthe instrument
cluster remains lit.
X Depress theaccelerator pedal.
X As soon asthe vehicle/t railercombinat ion
is held bythe driving forceofthe engine,
release lever:.
The electr icparking brakeisreleased.
The redF (USAonly)or! (Canada
only) indicator lampinthe instrument
cluster goesout.
Hill star tassist Hill
start assist helpsyouwhen pulling away
forwards orinreverse onanuphill gradient.
It holds thevehicle forashort timeafter you
have removed yourfootfrom thebrake pedal.
This gives youenough timetomove yourfoot
from thebrake pedaltothe accelerat orpedal
and depress itbefore thevehicle beginsto
roll. G
WARN
ING Never
leavethevehicle whenitis held byhill
start assist. Afterapproximately onesecon d,
hill start assist willnolonger brakeyour
vehicle anditcould rollaway. X
Take yourfootoffthe brake pedal. i
Onc
eyou have taken yourfootoffthe
brake pedal, thevehicle isheld foraround
one secon d.
X Pull away .
Hill start assist willnotfunc tion if:
R you arepulling awayonalevel roadora
downhill gradient.
R the tran smission isin position N.
R the electr icparking brakeisapplied.
R ES P®
is malfunct ioning. 142
DrivingDriving and parking