2012 MERCEDES-BENZ M-Class warning lights

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions The
displaymes sage ison lysho wnwhile theveh icleis in mot ion.
The yello w! warning lamp lightsup and thered F (USA
on ly)/ ! (Canadaonly) indic ato rlamp flashes.
It is no tp ossible toapply theelectric parking brakemanually .
X Shift thetrans mission toP.
X Visit aquali fiedspecialist workshop. F(USA
only)!(Canada
only)
Turn
Onthe Ignition
to Release
the Parking
Brake The
redF (USAonly)/ !(Canada only)indicator lamplights
up.
You attempt edtorelease theelectric parking brakewhilethe
ignition wasswitched off.
X Smar tKey: turntheSmart Keytoposition 1in the ignition lock.
X KEYL ESS-GO: switchonthe ignition. $(USA
only)J(Canada
only)
Check
BrakeFluid Level G
Risk
ofaccident There
isnot enough brakefluidinthe brake fluidreservoir.
Additionally, thered $ (USAonly)/ J(Canada only)
warning lamplights upinthe instr ument cluster andawarning
ton esounds.
X Pull over andstop thevehicle safelyassoon aspossible, paying
atten tiontoroad andtraffic conditions.Donot cont inue driving
under anycircumst ances.
X En gage theelectric parking brake.
X Consult aquali fiedspecialist workshop.
X Do not add brake fluid.Thiswillnotrect ifythe malfunct ion. G
WARNIN
G Drivin
gwith themessage Check Brake Fluid Level display
edcan result inan accident .Have
your brakesyst emcheck edimm ediat ely.
Do notadd brake fluidbefore checkingthe brake system. Overfillingthebrake fluidreserv oircan
result inspilling brakefluidonhot engin eparts andthebrake fluidcatching fire.Youcanbe
seriously burned. 244
Display
messagesOn-board computer and displays

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions PRE
-SAFE Fun
ctions Limited See
Operator's Man
ual G
Ri
sk ofacci dent PRE
-SAF E®
Br ake isdef ective. BASPLU Sor thed istanc ewarning
sign almay alsohave failed.
X Visi taqu alified specialist workshop. 6
SRS
Malfun ction Servic
eRequir ed G
Risk
ofinjur y There
isamalfunc tioninthe SRS (Supplemen talRestrain t
Syst em). The6 warning lampalsolights upinthe instrument
cluster .
X Visit aqualified specialist workshop. 6
Front
LeftSRS Malfun
ction Servic
eRequir ed or
Front
Right Malfun
ction Servic
eRequir ed G
Risk
ofinjur y SRS
hasmalfunc tionedatthe fron ton the left orright .The 6
warning lampalsolights upinthe instrument cluster.
X Visit aqualified specialist workshop. 6
Rear
LeftSRS Malfun
ction Servic
eRequir ed or
Rear
Right SRS Malfun
ction Servic
eRequir ed G
Risk
ofinjur y SRS
hasmalfunc tionedatthe rear onthe left orright .The 6
warning lampalsolights upinthe instrument cluster.
X Visit aqualified specialist workshop. 6
Rear
Center SRS Malfun
ction Servic
eRequir ed G
Risk
ofinjur y SRS
hasmalfunc tionedatthe rear center. The 6 warning lamp
also lights upinthe instrument cluster.
X Visit aqualified specialist workshop. 6
Left
SideCurtai n Airbag Malfun
ction Servic
eRequir ed or
Right Side Curtai
n Airbag Malfun
ction Servic
eRequir ed G
Risk
ofinjur y There
isamalfunc tioninthe left- hand and/or right-handwindow
curt ainairbag. The6 warning lampalsolights upinthe
inst rument cluster.
X Visit aqualified specialist workshop. 246
Display
messagesOn-board computer and displays

G
WARNING If
the 45 indicatorlamp remai nslitwith anadu ltoccupa nton the front-passenge rseat
even afterperform ingthe above corrective steps, donot have anypassenger usethefron t-
passenger seatuntil thesystem hasbeen repaired. Lights
i
Display
messages aboutLEDs:
This display message willonly appear ifall LED shave failed. Display
messages Possible
causes/consequences andM Solutions
b
Check
Left Corneri
ng Light or Check
Right
Corneri ng Light The
leftorright- hand cornering lightisdefect ive.
X Check whether youarepermitt edtochange thebulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Check
LeftLow Beam or Check Right
Low
Beam The
leftorright- hand low-beam headlamp isdefect ive.
X Check whether youarepermitt edtochange thebulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Check Trailer Left
Tail
Lamp or Check
Trailer Right Tail
Lamp The
leftorright- hand trailer taillamp isfaulty.
X Check whether youarepermitt edtochange thebulb yourself.
or
X Visit aqualified specialist workshop. b
Check Trailer Left
Turn
Signal or Check
Trailer Right Turn
Signal The
leftorright- hand trailer turnsignal lampisdefect ive.
X Check whether youarepermitt edtochange thebulb yourself.
or
X Visit aqualified specialist workshop. b
Check
Trailer Brake
Lamp The
trailer brakelampisdefect ive.
X Check whether youarepermitt edtochange thebulb yourself.
or
X Visit aqualified specialist workshop. 250
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