2012 MERCEDES-BENZ M-Class light

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions b
Che
ck Lef
t Day
time Run
ning Lig
ht or Che
ck Rig
htDaytim e Run
ningLig ht The
lefto rright -han ddaytime runninglamp isdefec tive.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Acti
veHead lamps Inop
erative The
active light function isdefec tive.
X Visit aqualified specialist workshop. b
Malf
unction See Oper
ator'sManu al The
exterior lightingisdefec tive.
X Visit aqualified specialist workshop. b
AUTO Lamp Func
tion Inop
erative The
light sensor isdefec tive.
X Visit aqualified specialist workshop. b
Swit
chOff Lights The
light sare still switc hedonwhen youleave thevehic le.A
warnin gton ealso soun ds.
X Turn thelight switc hto c orÃ. Adap
tive Highbeam Assi
stInop erative Adapt
iveHighb eamAssistisfaulty.
X Visit aqualified specialist workshop. Adap
tive Highbeam Assi
stCurr ently Unav
ailable See Oper
ator'sManu al Adapt
iveHighb eamAssistisdeact ivatedand temporar ily
inope rative. Possib lecauses are:
R the windsh ieldinthe came ra'sfield ofvision isdirt y.
R visibilit yis impaired duetoheavy rain,snowor fog.
X Clean thewindsh ield.
If the syst emdete ctsthat thecame raisfully functional again, the Adap
tive Highbeam AssistNow Available display
message
is shown .
Adapt iveHighb eamAssistisoperat ionalagain. Display
messages
253On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions Lan
eKee ping Ass
ist Ino
perative or Act
ive Lane Kee
pingAss ist Ino
perative Lan
eKee pingAs sis torA ctive Lane Keeping Assi stisdef ectiv e.
X Vis itaqu alifi ed spe cialist wo rksho p. Blin
dSpot Assist Curr
ently Unav
ailableSee Oper
ator'sManu al or Acti
veBlin d Spot
Assist Curr
ently Unav
ailableSee Oper
ator'sManu al Bli
nd Spot Assistor Active Blind Spot Assististemp orarily
inop erative .Possible causesare:
R you have established theelectric alconn ection between the
trailer andyour vehicle.
R the sensors aredirty.
R funct ionisimpaired duetoheavy rainorsnow.
R the radar sensor system isoutside theoperating temperature
range.
R the radar sensor system istemporarily inoperative, e.g.due to
electrom agneticradiation emittedbynearby TVorradio
station sor other sources ofelectrom agneticradiation.
The yellow 9indicator lampsalsolight upinthe exter ior
mirrors.
X When towing atrailer, confirmthedisplay message witha.
If you aredriving without atrailer andthedisplay message does
not disappea r:
X Pull over andstop thevehicle safelyassoon aspossible, paying
atten tiontoroad andtraffic conditions.
X Apply theelectric parking brake.
X Clean thesensors (Ypage 322).
X Restart theengine.
If the system detectsthat thesensors arefully operational, the
display message disappears.
Blind SpotAssist orAct ive Blind SpotAssist isoperational again. Blind
SpotAssist Inoperative
or Active
Blind Spot
Assist Inoperative Blind
SpotAssist orAct ive Blind SpotAssist isdefectiv e.
The yellow 9indicator lampsalsolight upinthe exter ior
mirrors.
X Visit aquali fiedspecialist workshop. Park
Assist Canceled The
driver's doorisopen andthedriver's seatbelthasnotbeen
fasten ed.
X Repeat theparking process withtheseat beltfastened andthe
driver's doorclosed. 260
Display
messagesOn-board computer and displays

Warning
andindic atorlamps inthe instrument cluster Seat
belt Probl
em Pos
siblecause s/cons equen cesand M Sol
utions 7
After
starting the
engine, thered seat
bel twarn ing lamp lights
up for sixsec onds. The
seat beltwarn inglamp remindsth edriv erand fron tpasse nger
to fast entheir seat belts.
X Fas teny our seat belt(Ypage 49). 7
Aft
erstart ingthe
engine, thered seat
belt warning lamplights
up. Inaddition, a
warning tonesounds
for uptosix seconds. G
Risk
ofinjur y The
driver's seatbeltisnot fastened.
X Fasten yourseatbelt(Ypage 49).
The warning toneceases. 7
The
redseat belt
warning lamplights up
after theengine starts,
as soon asthe driver's
or the front -passenger
door isclosed. G
Risk
ofinjur y The
driver orfront passenger hasnotfastened theirseatbelt.
X Fasten yourseatbelt(Ypage 49).
The warning lampgoesout. G
Risk
ofinjur y There
areobject son the front -passenger seat.
X Remove theobject sfrom thefront -passenger seatandstow
them inasecure place.
The warning lampgoesout. War
ning andindicator lampsin the instru mentcluster
269On-board computer and displays Z

Problem Possible
causes/co nsequences andM Solutions
!
The
yello wABS warning
lamp islit while the
engine isrunning. G
Risk
ofaccident ABS
(Anti-lock Brake System) isdeactivated duetoamalfunction .
BAS (Brake Assist), BASPLUS, ESP®
(Electr onicStability
Program), PRE-SAFE®
,PRE-SA FE®
Brake, theHOLD function,hill
start assist andESP®
trailer stabilization aretherefore also
deactivated, forexample.
The brake system continues tofunct ionnormally, butwithout the
funct ionslisted above. Thewheels couldtherefore lockifyou
brake hard,forexample.
ATTENTI ONASS ISTisdeactivated.
X Observe theadditional displaymessages inthe multifunct ion
display .
X Drive oncarefully.
X Visit aqual ified specialist workshop.
If the ABS controlunit isfaulty, thereisalso apossibili tythat other
systems, suchasthe navigation systemorthe automatic
transm ission,willnotbeavaila ble. !
The
yello wABS warning
lamp islit while the
engine isrunning. G
Risk
ofaccident ABS
istemporarily unavailable.BAS,BAS PLUS, ESP®
,EBD
(electronic brakeforcedistribution), PRE-SAFE®
,
PRE-SA FE®
Brake, theHOLD function,hillstart assist and
ESP ®
trailer stabilization aretherefore alsodeactivated, for
example.
Self diagnosis isnot yetcomplete orthe on-board voltagemaybe
insufficient ,for example.
The brake system continues tofunct ionnormally, butwithout the
funct ionslisted above. Thewheels couldtherefore lockifyou
brake hard,forexample.
ATTENTI ONASS ISTisdeactivated.
X Carefull ydrive asuitable distance makingslightsteering
movement sat aspeed above12mph (20km/ h).
The funct ionsment ioned above areavaila bleagain whenthe
warning lampgoesout.
If the warning lampisstill on:
X Observe theadditional displaymessages inthe multifunct ion
display .
X Drive oncarefully.
X Visit aqual ified specialist workshop. 272
War
ning andindicator lampsin the instrum entclusterOn-board computer and displays

Problem Possible
causes/co nsequences andM Solutions
֌
The
yello wESP ®
and
ESP ®
OFF warning
lamps arelitwhile the
engine isrunning. G
Risk
ofaccident ESP
®
,BAS ,PRE-SA FE®
,the HOLD function,hillstart assist and
ESP ®
trailer stabilization aretemporarily unavailable.
BAS PLUS andPRE-SA FE®
Brake mayalsohave failed.
ESP ®
will notstabilize thevehicle ifit starts toskid orifawheel
starts tospin.
Self diagnosis isnot yetcomplete.
The brake system continues tofunct ionnormally, butwithout the
funct ionslisted above. Thewheels couldtherefore lockifyou
brake hard,forexample.
ATTENTI ONASS ISTisdeactivated.
X Carefull ydrive asuitable distance makingslightsteering
movement sat aspeed above12mph (20km/ h).
The funct ionsment ioned above areavaila bleagain whenthe
warning lampgoesout.
If the warning lampisstill on:
X Observe theadditional displaymessages inthe multifunct ion
display .
X Drive oncarefully.
X Visit aqual ified specialist workshop. $
(USAonly)
! (Canada only)
The redindicator lamp
for the electric parking
brake flashes and/or
the yello w
!
warning lampforthe
electric parking brake
lights up. The
electric parking brakeistemporarily malfunctioningor
defective.
X Observe theadditional displaymessages inthe multifunct ion
display . 6
The
redSRS warning
lamp islit while the
engine isrunning. G
Risk
ofinjury The
restraint systemsaremalfunction ing.Theairbags orETDs
may either betriggered unintentionally or,inthe event ofan
accident, notbetriggered atall.
X Drive oncarefully.
X Visit aqual ified specialist workshop immediately. War
ning andindicator lampsin the instrum entcluster
275On-board computer and displays Z

G
WARNING In
the event amalfu nction ofthe SRS isindica tedasoutli nedabove,the SRS may notbe
opera tional.
For yoursafet y,we stron gly recomm endthat you contactana uth oriz edMer cedes-Ben zCent er
immediately tohave thesystem checked.Other wisetheSRS may notbeactivat edwhen needed
in an acciden t,which couldresult inserious orfatal injury, oritmight deploy unexpec tedlyand
unnec essarily whichcouldalsoresult ininjury. Engine
Problem Possible
causes/consequences andM Solutions
;
The
yellow Check
En gine warning lamp
lights upwhile the
engine isrunn ing. There
maybeamalfunct ion,forexample:
R in the engine managemen t
R in the fuel injec tionsystem
R in the exhaust system
R in the ignition system(forvehicles withagasoline engine)
R in the fuel system
The emission limitvalues maybeexceeded andtheengine may
be runn inginemergen cymode.
X Have thevehicle checkedassoon aspossible ataqualified
specialist workshop. i
In
some states,you arerequired bylaw toimmediately visita
qualified specialist workshop assoon asthe yellow Check
En gine warning lamplights up.Ifin doubt, checkwhether such
legal regulations applyinthe state/prov inceinwhich youare
current lydriving. Vehicles
withadiesel engine: thefuel tank hasbeen rundry
(Y page 152).
X Start theengine threetofour times afterrefueling.
If the yellow Check Enginewarning lampgoesout,emergency
running modeiscanceled. Thevehicle neednotbecheck ed. 8
The
yellow reserve fuel
warning lampflashes
while thevehicle isin
motion. Inaddition, the
yell ow Check Engine
warning lamp;
may light up. The
fuel system pressure istoo low. Thefuel filler capisnot closed
correct lyor the fuel system isleaking.
X Observe theadditional displaymessages inthe multifunction
displa y.
X Check thatthefuel filler capiscorrect lyclosed.
X Ifthe fuel filler capisnot correctly closed:close thefuel filler
cap.
X Ifthe fuel filler capisclose d:visit aqual ified specialist
workshop. 276
War
ning andindicator lampsin the instrum entclusterOn-board computer and displays

Problem Possible
causes/co nsequences andM Solutions
8
The
yello wreserve fuel
warning lamplights up
while theengine is
running. The
fuel level hasdropped intothereserve range.
X Refuel atthe nearest gasstation. ?
The
redcoolant
warning lamplights up
while theengine is
running andthecoolant
temperature gaugeis
at the start ofthe scale. The
temperature sensorforthe coolant temperature gaugeis
defective.
The coolant temperature isno longer beingmonitor ed.There isa
risk ofengine damage ifthe coolant temperature istoo high.
X Pull over andstop thevehicle safelyandswitch offthe engine,
payi ngatten tiontoroad andtraffic condition s.Do not cont inue
driving underanycircumst ances.
X Apply theelectric parking brake.
X Consult aqual ified specialist workshop. War
ning andindicator lampsin the instrum entcluster
277On-board computer and displays Z

G
WARNING Driving
whenyourengi ne isove rheatedcan causesom efluids which mayhave leaked intothe
engin ecom partmen ttocatch fire.Youcould beseriously burned.
Steam fromanoverheated enginecancause serious burnswhich canoccur justbyopening the
engine hood.Stayaway fromtheengine ifyou seeorhear steam coming fromit.
Stop thevehicle inasafe location awayfromother traffic.Turn offthe engine, getout ofthe
vehicle anddonot stand nearthevehicle untiltheengine hascooled down.
! Ifthe coolant temperature exceeds248‡(120 †)donot cont inue driving. Theengine will
otherwise bedamaged. Driving
systems Problem Possible
causes/cons equencesandM Solutions
·
The
reddistance
warning lamplights up
while thevehicle isin
motion .A warning tone
also sounds. G
Risk
ofaccident The
warning isissued ifyou approach astation aryvehicle ora
vehicle drivingaheadofyou attoo high aspeed.
X Be prepared tobrake immediately.
X Pay careful attentiontothe traffic situation. Youmay have to
brake ortake evasive action.
More informat ionabout DISTRONIC PLUS(Ypage 169)and
PRE-S AFE®
Brake (Ypage 65). War
ning andindicator lampsin the instru mentcluster
279On-board computer and displays Z