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

nece
ssary.F oreign objectscan disturb the
balance andcause vibrations.
Driving onsand G
WARNIN
G Do
not reduce thetire inflation pressure
before driving through sand.However, ifyou
do so, remember tocorrec tthe tire inflation
pressure beforecontinuing yourtrip.Drivin g
with reduced tireinflation pressure increases
the risk oflosing controlofthe vehicle and
rolling over.
Observe thefollowing ruleswhen driving on
sand:
R vehicles withtheAIRMATIC package:
select araised vehicle level.
R avoid highengine speeds.
R select ashift range appropriate tothe
terrain.
R drive quickly toovercom ethe rolling
resistance. Otherwise,thevehicle coulddig
itself intothesand.
R drive inthe track sof other vehicles if
possible. Makesurethattheruts arenot
too deep, thatthesand isfirm enough and
that your vehicle hassufficient ground
clearance.
Rut sand gravel roads Observe
thefollowing ruleswhen driving
along rutsinoff-r oad terrain oron roads with
loose gravel:
! Check thattheruts arenot too deep and
that your vehicle hassufficient clearance.
Otherwise, yourvehicle couldbedamaged
or bottom outand getstuck.
R for vehicles withAIRMATIC package:select
an increased vehiclelevel.
R avoid highengine speeds.
R select shiftrange 1. R
drive slowly .
R where rutsaretoo deep, drivewiththe
wheels ofone side onthe cent ergrassy
area, ifpossible.
Driving overobstacles !
Obstacles coulddamage thefloor ofthe
vehicle orcomponen tsof the chassis. Ask
passengers forguida ncewhen driving over
large obstacles. Thepassenger should
alwa yskeep asafe distance fromthe
vehicle whendoing soinorder toavoid
injury asaresult ofunexpect edvehicle
movement s.Aft erdriving off-road orover
obstacles, checkthevehicle forpossible
damage, especiallyto the underbody and
the componen tsof the chassis.
Observe thefollowing ruleswhen driving over
tree stumps, largestones andother
obstacles:
R raise thevehicle level.
R avoid highengine speeds.
R select shiftrange 1.
R drive veryslowly .
R drive straight overthecent erofobstacles. Driving
tips
165Driving and parking Z

Trave
ling uphi ll
App roac h/depa rture angle :
: 14
;
Ste
el-spri ng
ve hic les 26° 25° 25°
Veh
icle swi th
the AIRMA TIC
pac kag e Hig
hway level 23° 22°
22°
15 Ra
ised level 28° 27° 27°
R
Co mpl ywi th the rulesfor off-roaddri ving .
R Do not drive atan ang leon slop es,incl ines
or gra dients, butinstea dfol low the direct
li ne offall.T he maximum gradient-climbing
capabil ityofyour vehicle is100%, which
corresponds toan approach/departure
angle of45°. Note thatthevehicle's
gradient-c limbingcapabilitydepends on
the off-r oad condition s.
R Before tackling steepdownhill gradients,
select shiftrange 1.
R Drive slowly .
R Avoid highengine speeds –drive ata
sui table engine speed(maxi mum 3000
rpm). R
When drivingdow nanincli ne, makeuseof
the engine'sbra king effect. Observethe
eng inespeed;do not overrevthe engine.
R Check thebrakes afterdriving off-road for
a long time. G
WARNING Never
turnthevehicle around onsteep
inclines. Thevehicle mightrollover. Ifthe
vehicle cannotcomplete theattempt edclimb,
back itdown inreverse gear. i
Hill
start assist willaidyou when pulling
away onahill.
For further information ,see "Hill start
assist" (Ypage 142).
Maximum gradient-climbing capability For
good roadsurface condition s,the
maximum gradient-climbingcapabilityis
100%, whichcorresponds toan approach/
departure angleof45°. Note thatthe
vehicle's gradient-c limbingcapability
depends onthe off-r oad condition s.
Acc elerate carefully andmake surethatthe
wheels donot spin when driving onsteep
terrain. i
If
the load onthe front axleisreduced
when pullingaway onasteep uphillslope,
the front wheels haveatenden cytospin.
4ETS recogniz esthis and brakes the
wheels accordingly. Therear wheel torque
is increased, makingiteasier todrive off.
Brow ofhill When
driving upanuphill gradient, slightly
reduce pressure onthe accelerator
immediately beforereaching thebrow ofthe
hill. Use thevehicle's ownimpetus todrive
over thetop ofthe hill.
14 With AMG bodystyling.
15 166
Driving
tipsDriving and parking

The ML 350 4MATIC model has a departure angle of 23°.

This
style ofdriving prevent s:
R the vehicle fromlifting offthe ground onthe
brow ofahill
R the vehicle fromtraveling tooquickly down
the other side
Driving downhill R
Drive slowly.
R Do not drive atan angle down steep
inclines. Steer into theline offall and drive
with thefron twheels aligned straight.
Otherwise, thevehicle couldslipsidewa ys,
tip and rollover.
R Before tackling steepdownhill gradients,
select shiftrange 1.
R Act ivate DSR. Ifthis isnot sufficient, brake
gently. Whendoingso,make surethatthe
vehicle isfacing inthe direction ofthe line
of fall.
R Check thatthebrakes areworking normally
after along downhill stretch. i
The
special off-road ABS settin genables
a precise, briefandrepeated lockingofthe
front wheels, causing themtodig into the
loose earth. Beaware thatthefront wheels
easily skidacross theground surface if
completely brakedandtherefore losetheir
abili tyto steer. Driving
systems Cruise
control
Import antsafety notes G
WARNING The
cruise controlisaconven iencesystem
designed toassist thedriver during vehicle
operation. Thedriver isand must always
remain responsible forthe vehicle's speed
and forsafe brake operation.
Only usethecruise controlifthe road, traffic,
and weather condition smake itadvisabl eto
travel ataconst antspeed. R
The useofthe cruise controlcan be
dangerous onwinding roadsorinheavy
traffic because condition sdo not allow safe
driving ataconst antspeed.
R The useofthe cruise controlcan be
dangerous onslippery roads.Rapid
changes intire tract ioncan result inwheel
spin andloss ofcont rol.
R Deactivate thecruise controlwhen driving
in fog.
The "Resu me"funct ionshould onlybe
operated ifthe driver isfully aware ofthe
previously setspeed andwishes toresume
this particular presetspeed. G
WARNING The
cruise controlbrakes automatically so
that thesetspeed isnot exceeded.
General notes Cruise
controlmaintains aconst antroad
speed foryou. Itbrakes automatically inorder
to avoid exceeding thesetspeed. Onlong and
steep downhill gradients, especiallyif the
vehicle isladen ortowing atrailer, youmust
select shiftrange 1,2or 3in good time. By
doing so,you willmake useofthe braking
effect ofthe engine, whichrelieves theload
on the brake system andprevents thebrakes
from overheating andwearing tooquickly.
Use cruise controlonly ifroad andtraffic
condition smake itappropriate tomaintain a
steady speedforaprolonged period.Youcan
set any road speed above20mph
(30 km/h). i
Cruise
controlshould notbeactivated
during off-road driving. Driving
systems
167Driving and parking Z

(30
km/h). When thevehic lespeed exceeds
20 mph (30km/h), theindic atorlamp goes
out and BlindSpot Assistisready foruse.
When yourspeed exceeds approx imately
20 mph (30km/h), warnin glamp :light sup
red ontheco rrespo nding side when evera
vehicl eis detected inthe blind spot
monitoring range.Thiswarning isalw ays
given when avehicl eenters theblind spot
monitoring rangefrombehindorfrom the
side .When youarepassing another vehicle,
the warning isemitted onlyifthe difference
in speed isless than 7mph (12km/h).
The yellow indicator lampgoesoutifreverse
gear isengaged. Inthis event, BlindSpot
Assist isno longer active.
The brightness ofthe indicator/warnin g
lamps isadjusted automatically accordingto
the ambient light. G
WARNING Blind
SpotAssist isnot active atspeeds under
approximately 20mph (30km/h). The
indicator lampsinthe exterior mirrorsare
yellow .Vehicles inthe monit oringrange are
then notindicat ed.
Always payatten tiontotraff iccon ditions and
your surroundin gs.Other wise,youmay failto
recogn izedangers intime, cause anacciden t
and injure yourself andother s.
Collisio nwarning
If avehicle isdetec tedinthe monit oringrange
of Blind SpotAssist andyouswitch onthe turn
signal, adouble warning tonesounds. Red
warning lamp:flashes. Ifthe turn signal
remains on,detect edvehicles areindicated
by the flashing ofred warning lamp:.There
are nofurther warning tones.
Switching onBlind SpotAssist
X Make surethattheradar sensor system
(Y page 236)andBlind SpotAssist (Y
page 232)areactivated inthe on-board
computer.
X Turn theSmartK eytoposition 2in the
ignition lock.
Warning lamps:light upred inthe
exterior mirrorsforapproximately 1.5
seconds andthen turnyellow.
Tra iler towing
When youattach atrailer, makesureyouhave
correct lyestablished theelectrical
conn ection. Thiscanbeaccomplished by
check ingthe trailer lighting. Inthis event,
Blind SpotAssist isdeactivated. Theindicator
lamp inthe exterior mirrorslightsupyell ow,
and the Blind
SpotAssist Currently Unavailable
SeeOperator's Manual message
appearsinthe multifunction
displa y. i
You
candeactivate theindicator lampsin
the exterior mirrors.
To do so, switch offBlind SpotAssist when:
R the SmartK eyisin position 2in the
ignition lock.
R the engine isnot running.
R the electrical connection tothe trailer
has been established.
Lane Keeping Assist Import
antsafety notes
Lane Keeping Assistmonitors thearea in
front ofyour vehicle bymeans ofacamera at
the top ofthe windshield. LaneKeeping Assist
detect slane markings onthe road andwarns
you before youleave yourlane
uninten tionally. 200
Driving
systemsDriving and parking

Please
notethat when towing atrailer,
PARKTRONIC (Ypage 183)andBlind Spot
Assist (Ypage 198)areonly availabl ewith
limitations ,or not atall. i
On
vehicles withoutlevelcontrol,the
height ofthe ball coupling willalter
accordin gto the load placed onthe vehicle.
If necess ary,useatrailer withaheight-
adjustable drawbar.
Driving tips i
Observe
theinform ationonESP®
trailer
stabilization (Ypage 64)and onpulling
away withatrailer. (Ypage 141).
The maximum permissible speedforvehicle/
trailer combinat ionsdepends onthe type of
trailer. Before beginnin gthe journ ey,check
the trailer's document sto see what the
maximum permittedspeed is.Observe the
legally prescribed maximumspeedinthe
relevant country.
For cert ainMercedes- Benzvehicles, the
maximum permissible rearaxle load is
incr eased whentowing atrailer. Refertothe
"Technical data"sectiontofind outwhether
this applies toyour vehicle. Ifyou utilize any
of the added maximum rearaxle load when
towing atrailer, thevehicle/t railer
combinat ionmay notexceed amaximum
speed of60 mph(100 km/h)for reasons
conc ernin gthe operating permit.Thisalso
applies incount riesinwhich thepermissible
maximum speedforvehicle/t railer
combinat ionsisabove 60mph(100 km/h).
When towing atrailer, yourvehicle's handling
charact eristics willbedifferen tinc omparison
with when driving without atrail er.
On long andsteep downhill gradients, you
must selectshift range 1,2or 3in good time. i
This
alsoapp liesif you have activated
cruise control orDISTRONIC PLUS.
This willuse thebraking effectofthe engine,
so that lessbraking willbe requ iredto
maintai nthe speed. Thisrelieves theload on
the brake system andprevents thebrakes from
overheating andwearing tooquickly. If
you need additional braking,depressthe
brake pedalrepeatedly ratherthan
cont inuously .
Driving tips R
Maintain agreater distance fromthe
vehicle infront thanwhen driving without a
trailer.
R Avoid braking abruptly. Ifpossible, brake
gently atfirst toallow thetrailer torun on.
Then, increase thebraking forcerapidly .
R The values givenforgradient-c limbing
capabil itiesfrom astandst illrefer tosea
level. When driving inmountainous areas,
note thatthepower output ofthe engine,
and consequent lythe vehicle's gradient-
climbing capability,decrease with
increasing altitude.
If the trailer swings fromsidetoside:
X Do not accelerate.
X Do not counter- steer.
X Brake ifnecessary. Assemblin
gthe ball coupling
! Mercedes-Ben zrecomm endsthatyou
have theball coupling assembled ata
qualified specialist workshop.Only a
qualified specialist workshophas the
nec essary specialist knowledge andtools
to carry outthework required. Youcould
other wiseincorrectlyassemble theball
coupling ortight enthe nut with the
incor recttorque. Thiscould leadtothe ball
coupling andtheball coupling carrier
becomin gdetached whiletowing atrailer.
As aresult, youcould cause anacciden t.
Therefor e,have theball coupling
assembled ataqualified specialist
worksho p.
If the assembled ballcoupling hasbeen
permanen tlymount edon the vehicle, have
the ball coupling regularly checkedfor 212
Tr
ailer towingDriving and parking

G
WARNING Do
not disconnect atrail erwith anengag ed
overru nbrake. Otherwi se,you rhand could
bec ome trapped between thebumpe rand
trai lerd rawb ar.
Observe themaximu mpermissible trailer
dimension s(width andlengt h).
Most federal statesand allCanadian
provin cesrequire bylaw:
R safety chains between thetowing vehicle
and thetrailer. Thechains should becross -
wound underthetrailer drawbar. Theymust
be fasten edtothe vehicle's trailer
coupling, nottothe bumper orthe axle.
Allow forenough playinthe chains to
facilitat eturn ingtight corners.
R aseparate brakesystem forcert aintypes
of trailer.
R asafety switch forbraked trailers. Check
the specific legalrequirement sapplicable
to your federal state.
If the trailer detaches fromthetowing
vehicle, thesafety switch applies the
trailer's brakes.
! Donot connectthe trailer's brakesystem
(if featured) tothe hydrau licbrake system
of the towing vehicle, asthe latter is
equipp edwith ananti-lock brakesystem.
Doing sowill result inaloss offunct ionof
the brake systems ofboth thevehicle and
the trailer.
X Make surethattheautomatic transmission
is set toposition P.
X Apply thevehicle's electricparking brake.
X Start theengine.
X Vehicles withtheAIRMATIC package:
select highway level.
X Vehicles withtheadaptive damping
system: setADS toAUTO orCOMF.
X Switch offthe engine.
X Close alldoors andthetailgate.
X Coupl eup the trailer.
X Est ablish allelectrical connections. i
Vehicles
withtheAIRMATIC package:
if you couple upatrailer, thevehicle always
remains athighway level.When coupling up
a trailer, please observe thefollowing:
R ifhighway levelhasnotbeen set
manually ,the vehicle willautomatically
sink tohighway levelassoon asit
reaches aspeed of5m ph(8km/ h).
R high-spe edlevel isnot available.
These restrictions apply toall access ories
powered through acon nection tothe trailer
power socketofyour vehicle, e.g.abicycle
carrier . Towing
atrail er
Th ere arenum erouslega lreq uirem ents
conce rning the towingofatra iler, e.g.speed
rest rictions. Make surethatyour vehicle/
trailer combin ationcomplies withthelocal
requiremen tsnot only inyour areaof
residen cebut also atany location towhich
you aretrav eling. Thepolice andlocal
authorit iescan provide reliableinformation .
Please observe thefollowing whentowinga
trailer:
R To acquaint yourselfwithdrivin gwith a
trailer andwith theresultin gchang esto
handling, youshould practicecorn ering,
stoppin gand backin gup inatraf fic-free
location .
R Befor edrivin g,chec k:
- the trailer towhitch
- the safety switchfor braked trailers
- the safety chains
- the elect ricalconnection s
- the lights
- the wheels
R Adj ust the exterior mirror sto provide an
unobst ructedview ofthe rear sectionofthe
trailer.
R Ifthe trailer features electronic ally
con trolled brakes, pullaway thevehicle/
trailer combin ationcarefully, manually 216
Tr
ailer towingDriving and parking

brake
usingthebrake controller, andchec k
the brakes forcorr ectfunc tion.
R Sec ureany objec tson the trailer topreven t
the cargo fromslipping whenthevehicle is
in mot ion.
R Ifyou couple upatrailer, regularly check
the cargo forsecure fasteningand make
sure thatthetrailer lamps and(if
applicable) thetrailer brakes are
func tioningcorr ectly.
R Bear inmind thatthehandling willbeless
stable whentowingatrailer thanwhen
drivin gwithout one.Avoid sudden steering
movem ents.
R The vehicle/ trailercombin ationisheavier,
acceler atesmore slowly, hasadecreased
gradient climbingcapability andalonger
brakin gdistan ce.
It is more suscept ibletoside winds and
requires morecareful steering.
R Ifpossible, avoidabrupt braking.Depres s
the brake pedalmoderat elyatfirst ,so that
the trailer canactiv ateitsown brakes. Then
incr ease thepressure onthe brake pedal.
R Ifthe automatic transmission continues to
shift back andforthbetween twogears
when drivingup ordownhill, restrict the
shift range. Selectshiftrange 4,3,2,or 1.
Al ower gearandlower speed reduce the
risk ofengine failure.
R On long andsteep gradients thatare
difficult todrive down inshift range 1,
switch tothe off-road program orengage
the LOW GEAR off-road gear.
R When driving downhill, shifttoalower gear
to utilize theengine's brakingeffect.
Avoid continuous brakeapplication asthis
may overheat thevehicle brakesand,if
installed, thetrailer brakes.
R Ifthe coolant temperat ureincreases
dramatically whiletheair-con ditioning
system isswitched on,switch offthe air-
condit ioning system.
Coolant heatcanadditionally bedissipated
by opening thewindows andbysett ingthe blower
fanand theinterior temperat ureto
maximum.
R When overtak ing,payparticular attention
to the exten dedlength ofyour vehicle/
trailer combinat ion.
Due tothe length ofyour vehicle/t railer
combinat ion,youwillhave totravel an
additional distancebeyondthevehicle you
are overtak ingbefore returningtothe
previous lane. Deco
upling atrail er G
WA
RNI NG Ve
hicle swi th airs uspen sionprogram :While
you arecoupling ordecoupling atrailer, make
sure nobody locksorunlocks thevehicle and/
or opens orcloses doorsorthe tailgate.
The vehicle's levelcould change andyou
could endanger yourselfand/orothersasa
result.
Make surethatyoudonot operate theADS
switch orthe vehicle levelcontrolsystem
when coupling/decoupling thetrailer.
! Donot disconnec ta trailer withan
engaged overrunbrake.Otherwise, your
vehicle couldbedamaged bythe
rebounding ofthe overrun brake.
X Make surethattheautomatic transmission
is set toposition P.
X Apply thevehicle's electricparking brake.
X Start theengine.
X Close alldoors andthetailgate.
X Apply thetrailer's parkingbrake. G
WARNING Vehicles
withairsuspension program:As
soon asyou disconnec tthe electrical
conn ection between thetrailer andthe
vehicle, thevehicle willlower. Tohelp avoid
personal injury,makesurenoone isnear the
wheel housing orunderneath thevehicle
before theelectrical connection is
disconnec ted. Tr
ailer towing
217Driving and parking
Z

When
youdecouple thetrailer, thevehicle is
tempor arilyraised because thesprings are
relieved ofload. Beespecially carefulduring
this process, asyou could otherwise injure
yourself and/orothers.Make sure that any
pers onsrem ainin gin theveh icle donotp ress
the switches forvehicl elevel control orthe
ADS.
X Remo vethe trail ercabl eand decou plethe
trail er.
X Switch offthe engine. Permissi
bletrailer loadsanddrawbar
nos eweig hts
Weig htspec ifications The
gross trailerwei ght iscalcu lated by
add ingthe weight ofthe trail erto the weight
of the loadand equipme nton the trail er.
Maximu mgross vehicl ewei ght: 17
.
The maximu mpermissible trailerdrawbar
noseweight isthe maximum weightwith
which thetrailer drawbar canbeloaded: 17
Threshold forMercedes- Benzapproved
trailer towhitches.
Loading atrail er R
Wh enload ing the trailer, makesure tha t
nei the rthe permissible grossweight ofthe
trailer northegross vehicle weightare
exceeded. Thepermissible grossvehicle
weight isindicated onthe identification
plate onthe B-pillar onthe driver's sideof
the vehicle.
You canfind themaximum permissible
values onthe type plates ofyour vehicle
and thetrailer. Always observe thelowest
respective valuewhen determining the
maximum weightwithwhich youcan load
the vehicle andthetrailer.
R The trailer drawba rload onthe ball coupling
must beadded tothe rear axle load toavoid exceeding
thepermissible grossaxle
weight. Thepermissible grossvehicle
weight isindicated onthe identificat ion
plate onthe B-pillar onthe driver's sideof
the vehicle. i
Mercedes-B
enzrecomm endsloading the
trailer sothat thedrawbar noseweight
remains between 8%and 15% ofthe
permissible grosstrailer weight. i
The
weight ofadditional accessories,
passengers, andcargo reduces the
permissible trailerloadanddrawbar
noseweight foryour vehicle.
Checking thevehicle andtrailer weight R
To check thattheweights ofthe towing
vehicle andthetrailer comply withthe
maximum permissible values,havethe
vehicle/t railercombinat ion(including the
driver, passengers, andcargo withafully
laden trailer) weighed onacalibrated
weighbridge.
R Check thegross axleweight ratingofthe
front andrear axles, thegross weight ofthe
trailer andtrailer drawbar noseweight. Removing
theball coupling
X Remove thespring cotter.
X Remove thebolt from theball coupling
recess.
X Remove theball coupling fromtheball
coupling recess.
X Clean theball coupling ifit is dirty.
Infor mation oncleaning andcare ofthe trailer
tow hitch canbefound at(Y page 322). Storing
theball coupling G
WARNIN
G Do
not carry theball coupling inthe vehicle
interior ifit is not secured.
17 Missing valueswerenotavailabl eattime ofgoing toprin t. 218
Tr
ailer towingDriving and parking

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). Impor
tant safet ynotes You
willfind anillustrat ionofthe instrumen t
clust erinthe "Ataglance" section
(Y page 29). G
WARN
ING A
driver' satt ent ion tothe road andtraffic
con dition smust always behis/her primary
focus whendriving.
For your safetyand thesafet yof other s,
select ingfeature sthr ough themultifun ction
steer ingwheel should onlybedone bythe
driver whentrafficand road condition spermit
it to be done safely.
Bear inmind thatataspeed ofjust 30mph
(approxim ately50km/ h),your vehic leis
cove ringadistan ceof44 feet (approxim ately
14 m)every second. G
WARN
ING No
messages willbedisplayed ifeither the
inst rumen tclust eror the multif unction
display isinoper ative.
As aresult, youwillnotbeable tosee
info rmat ionabout yourdrivin gcon dition s,
such as
R speed
R outside temperatur e
R warnin g/indicato rlamps R
malf unction/ warn ingmes sages
R failur eof any systems
Dr ivin gch arac terist ics may beimpair ed.
If you must continue todriv e,do sowith added
caut ion.Contac tana uth oriz edMer cedes-
Ben zCent eras soon aspossible. G
WARN
ING Malfunct
ionand warning messages areonly
indicat edfor cert ainsystems andare
inten tionally notvery detailed. The
malfunct ionand warning messages are
simply areminder withrespect tothe
operation ofcert ainsystems. Theydonot
replace theowner's and/ordriver's
respons ibilitytomaint ainthe vehicle's
operatin gsafety. Haveallrequired
maint enanc eand safety checksperform edon
the vehicle. Bringthe vehicle toan authorized
Mercedes- BenzCenter toaddress the
malfunct ionand warning messages. Displays
andopera tion Coolant
temperaturedispla y G
WARN
ING Drivin
gwhen yourengine isoverheat edcan
cause somefluidswhich mayhave leaked into
the engine compart menttocatc hfire. You
could beseriously burned.
St eam from anoverheat edengine cancause
serious burnswhich canoccur justbyopening
the engine hood.Stay away fromtheengine
if you seeorhear steam comingfrom it.
St op the vehicle inasafe location awayfrom
other traffic.Turn offthe engine, getout ofthe
vehicle anddonot stand nearthevehicle until
the engine hascooled down.
The coolant temperaturegauge isin the
inst rument clusteronthe right- hand side.
Under normaloperatin gcon ditions andwith
the specified coolantlevel,thecoolant
temper aturemayriseto248 ‡(120 †). 222
Displays
andopera tionOn-board computer and displays

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions G
Tel
eAid Ino
perative US
Ao nly:one ormor eof the mainfunctio nsinthe mbr ace system
ar ema lfunctio ning.
Ca nad aonl y:one ormor eof the mainfunctio nsofthe TELEAI D
sy stem arema lfunctio ning.
X USA only:ha ve the mbr ace system checked ataq ualifi ed
spec ialist workshop.
X Canad aon ly: have theTE LE AIDs ystem checke dat aqualif ied
spe cialist wor kshop . PRE
-SAFE Ino
perative See Ope
rator'sMan ual G
Ri
sk ofinjury Im
por tant fun ction sofPRE-SAFE ®
have failed .Alloth erocc upant
safet ysyst ems, e.g.airbags, remain available.
X Visit aqualified specialist workshop immed iately. PRE-
SAFE Func
tion Curr
ently Limi
tedSee Oper. Manu
al G
Risk
ofacciden t PRE-
SAFE®
Br ake istem porar ilyinope rative if:
R the DISTRON ICPLUS coverinthe radiat orgrill isdirt y.
R the sensors inthe bumper sare dirty.
R its func tion isimpaired duetoheavy rainorsno w.
R the radar sensor syst emistem porar ilyinope rative, e.g. due to
elect romagnet icradiat ionemit tedbynear byTV orradio
st ation sor oth ersourc esofelect romagnet icradiat ion.
R the syst emisouts idethe operat ingtem perat urerang e.
R the on-board voltage istoo low.
PRE- SAFE®
Br ake isoperat ionalagain andthedisplay message
disappears if:
R the dirt (e.g.slush) drops awaywhile thevehic leisin mot ion.
R the syst emdete ctsthat thesensors arefully available again.
R the syst emiswithin theoperat ingtem perat urerang e.
If the display messagecontinues tobe displayed:
X Clean theDISTRON ICPLUS coverinthe radiat orgrill
(Y page 322).
X Clean thebumper s(Y page 322).
X Restar tthe engine.
X Wait untilthebattery issufficiently charged. Display
messages
245On-board computer and displays Z