2012 MERCEDES-BENZ M-Class Owner's Manual

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions ?
Coo
lantLev elLow Sto
pVeh icl eTur n Eng
ine Off The
coolan tistoo hot.
X Pull over andstop thevehicle safelyandswitch offthe engine,
pay ing attent iontoroad andtraffic conditions.
X Make surethattheairsuppl yto the engine radiatorisnot
blocked, e.g.bysnow, slushorice.
X Wait untilthedispla ymessage disappearsbefore restarting the
engine. Otherwise, thereisarisk ofengine damage .
X Pay attent iontothe coolant temperature display.
X Ifthe temperature increasesagain,visit aqual ified speciali st
workshop immediately . The
poly-V-belt mayhave torn.
X Pull over andstop thevehicle safelyandswitch offthe engine,
pay ing attent iontoroad andtraffic conditions.
X Open thehood.
X Check whether thepoly-V-belt istorn.
If the poly-V-belt istorn:
! Donot cont inue driving. Theengine couldotherwise overheat.
X Consult aqual ified speciali stworkshop.
If the poly-V-belt isnot dam aged:
X Wait untilthedispla ymessage disappearsbefore restarting the
engine. Otherwise, thereisarisk ofengine damage .
X Pay attent iontothe coolant temperature display.
X Visit aqual ified speciali stworkshop. G
WARNING Driving
whenyourengine isoverheated cancause somefluidswhich mayhave leaked intothe
engine compartment tocatch fire.Youcould beseriously burned.
Steam fromanoverheated enginecancause serious burnswhich canoccur justbyopening the
engine hood.Stayawayfrom theengine ifyou seeorhear steam coming fromit.
Stop thevehicle inasafe location awayfrom other traffic. Turnoffthe engine, getout ofthe
vehicle anddonot stand nearthevehicle untiltheengine hascooled down.
! Ifthe coolant temperature exceeds248‡(120 †)donot cont inue driving. Theengine will
otherwise bedamage d. Dis
play messages
255On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions ? The
engin efan isdef ective.
X At coolan ttemperatures under248‡(120 †),drive tothe next
qualified specialist workshop.
X Avo idsubjec tingthe engin etoheavy loads, e.g.driving in
mountainous terrain,andstop- and-go traffic. # The
battery isnot being charged.
Possible causesare:
R adefectiv ealternator
R atorn poly-V-belt
R amalfunct ioninthe electron ics
X Pull over andstop thevehicle safelyandswitch offthe engine,
paying attentiontoroad andtraffic conditions.
X Open thehood.
X Check whether thepoly-V-belt istorn .
If the poly-V- beltistorn:
! Donot cont inue driving. Theengine couldotherwise overheat.
X Consult aquali fiedspecialist workshop.
If the poly-V- beltisnot dam aged:
X Visit aquali fiedspecialist workshop. 4
Check
Engine Oil At
Next Refueling The
engine oillevel hasdropped tothe minimum level.
Aw arning tone also soun ds.
X Chec kthe engine oillevel atthe latest whennextrefueling
(Y page 313).
X Ifnecessary, addengine oil(Ypage 314).
X Ifengine oilneeds tobe added moreoften thanusual,have the
engine checkedataqual ified specialist workshop. Inform
ationonapproved engineoilscan beobtained fromanyqual ified specialist workshop
or on the Internet athttp: //www.mbusa.com (USAonly).
! The oillevel istoo low. Avoid longjourneys withtoolittle engine oil.There isarisk of
engine damage.
The displa ymessages andthecorresponding symbolthatindicate thattheoillevel istoo
low must notbeignored. 256
Display
messagesOn-board computer and displays

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions 8
Fue
lLev el Low The
fuellev elhas dropped into theres erveran ge.
X Refu elat thene ares tgas statio n. C Ther
eis on lyaver ysmal lamoun toffuel inthef uel tank.
X Refue lat thene ares tgas statio nwitho utfail. 8
Gas
CapLoos e The
fuel systempress ureistoo low. Thefuel filler capisnot clos ed
cor rectlyorthe fuel systemisleakin g.
X Check thatthefuel filler capiscor rectlyclos ed.
If th efuel filler capisnot corr ectly closed:
X Close thefuel filler cap.
If th efuel filler capiscorr ectly closed:
X Visit aqualified specialist workshop. 8
Ultr
aLow- sulfur Dies
elFuel Only Vehic
leswith adiesel engine: thefuel level hasfallen below the
reser verang e.
X Refuel atthe near estgas station .
X Only usecom merc iallyavailable vehicularULTRA -LOW SUL FUR
HIGH WAYDIES EL FUE L(ULS D,15 ppm SULFUR MAXIMUM ). ¸
Repl
aceAir Filter Vehic
leswith adiesel engine: theengineairfilterisdirt yand must
be replac ed.
X Visit aqualified specialist workshop. !
Chec
kFuel Filter Vehic
leswith adiesel engine: thereiswater inthe fuel filter. The
water mustbedrain edoff.
X Visit aqualified specialist workshop. Ø
Chec
k Addi
tive See
Oper
ator'sManu al The
DEFtan kis empt y.
X Have theDEFtank filledas soon asposs ibleataq ualifi ed
spec ialist workshop(Y page 152). Ø
Rem
aining Starts: 16 The
DEFlevel hasfallen toaminimum.
X Have theDEFtank filledimm ediat elyataqualifi edspec ialist
work shop.(Y page 152) Displ
aymes sages
257On-board computer and displays Z

Dri
vin gsys tems Disp
laymessa ges Poss
iblecauses/ conse quences andM Solu
tions À
Att
ention Assist: Dro
wsiness Det
ected Bas
edon spe cific criteri a,AT TENTI ON ASSIST has determ ined that
th edri ver istired orpayin gles sat te nt ion .Aw arning tone also
soun ds.
X Ifne ces sary, takeabreak .
Dur inglongjo urn eys, takereg ular break sin good timeso you get
en ough rest. À
Att
ention Assist Ino
perative AT
TENTI ON ASSIST has faile d.
X Visi taqu alified specialist workshop. Á
Drive
MoreSlowly You
cann otchang ethe vehicle level.Possible causesare:
R you aredrivin gtoo fast forthe select edvehicle level.
R you aretowin gatrailer.
R the trailer- coupling socketisbeing used,e.g.forabicycle rack.
X Driv emore slowly andthen select thedesired vehiclelevelagain
(Y page 181).
X Observ ethe noteson towin gatra iler (Y page 210) . Á
Com
pressorIs Coo
ling Yo
uha ve selected ahigh er veh iclelevel .The compressor first
needs tocool down because offrequent levelchanges.
X Drive inamanner appropria tefor the current vehiclelevel.
X Make surethatthere issufficient groundclearance.
X Allow thecompressor tocool down.
When thecompressor hascooled down,thedispla ymessage
disappe ars.Thevehicle thencontinues rising tothe selected
level. Á
Malfunction AIRMATIC
ismalfunctionin g.
X Drive inamanner appropria tefor the current vehiclelevel,but
no faster than50mph (80km/h).
X Make surethatthere issufficient groundclearance.
X Have thevehicle checkedataqual ified specialist workshop. The
Active Curve System isfaulty. Thevehicle's handling
characterist icsmay beaffected.
X Do not drive faster than50mph (80km/h).
X Have thevehicle checkedataqual ified specialist workshop. 258
Display
messagesOn-board computer and displays

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions h
Max
.Spe ed 12MPH G
Ri
sk ofacci dent The
Active Curv eSys temi sfaulty. Thevehicle's handling
characteristics areseverely impaired.
In addition, thevehicle leveldispla yappea rsbetween thevehicle
icon andthedispla ymessage, andawarning tonesounds.
X Do not drive faster than12mph (20km/h).
X Adjust yourdriving styletothe altered handling characteristics.
X Visit aqual ified speciali stworkshop immediately . Ã
Inoperative DSR
(Downhill SpeedRegulation) isdeactivated duetoa
malfunction.
X Have DSRchecked ataqual ified speciali stworkshop. HOLD
Off The
HOLD function isdeactivated. Thevehicle isskidding.
Aw arning tone also soun ds.
X React ivateth eHO LD function late r(Y page 179). Rad
arSensors Dea
ctivatedSee Ope
rator'sMan ual The
radar sensor syst emisdeac tivate d.
X Swit chon theradar sensor syst em(Ypage 236). Lan
eKee ping Ass
ist Currently Una
vailableSee Ope
rator'sMan ual or Act
ive Lane Kee
pingAss ist Cur
rently Una
vailableSee Ope
rator'sMan ual Lan
eKeep ingAssist orActiveLan eKeep ingAssist isdeac tivate d
and tempo rarilyino perat ive.Poss iblecaus esare:
R thewind shieldinthecam era'sfiel dof vis ion isdirt y.
R vis ibilit yis impair eddue toheav yrain ,sn ow orfog .
R there arenolane markingsfor alon ger period.
R thelane markingsare worn ,dark orcover ed, e.g.bydir torsnow .
If the displ aymes sage does not disa pp ear:
X Pu llove rand stop thevehiclesa fel yas soo naspossible ,pay ing
attent iontoroad andtraffic conditions.
X Apply theelectric parking brake.
X Clea nthe windshield.
If the system detectsthat thecamera isfully operational, the
displa ymessage disappears.
Lane Keeping AssistorAct ive Lane Keeping Assistisoperational
again. Display
messages
259On-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

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions You
haveinadve rten tly to uch edthemult ifunction steer ing whee l
while steer ing inte rven tion was active.
X Whil est eer ing inte rven tion isact ive,mak esur eth at the
mult ifunction steer ing whee lis no ttouched unintentionally. The
vehicle hasstart edtoskid andESP®
has interv ened.
X Use Active Parking Assistagainlater(Ypage 186). Park
Assist Inoperative You
have justcarried outalarge number ofturnin gor parking
maneuvers.
Act ive Parking Assistwillbecome availableagain after
approximately 10minutes (Ypage 186).
X Pull over andstop thevehicle safelyassoon aspossible, paying
atten tiontoroad andtraffic conditions.
X Switch offand restart theengine.
If the display message continues tobe display ed:
X Visit aquali fiedspecialist workshop. PARKTRONIC
isdefectiv e.
X Visit aquali fiedspecialist workshop. Park
Assist Finished The
vehicle isparked. Awarning tone also soun ds.
The displ aymes sage disapp earsautomaticall y. DIS
TRONIC PLUS Off DI
ST RONI CPLU Shasbeen deactivate d(Y page 169). Ifit was
deac tivate dauto maticall y,awarn ingtone also soun ds. DIS
TRONIC PLUS Now
Availa ble DI
ST RONI CPLU Sisoperational againafter havingbeen
tempora rilyunava ilable .You can now reactivat eDIS TRONIC PLUS
(Y page 169). Display
messages
261On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions DIS
TRONIC PLUS Cur
rently Una
vailableSee Ope
rator'sMan ual DI
ST RON ICisdeac tivat ed and tempo rarily inoper ative. Pos sible
caus esare:
R theDI ST RON ICPLU Sco ver intheradi atorgri lle isdir ty.
R fun ction isimp aire ddue toheav yrain orsnow.
R thesen sorsin thebump ersare dirty.
R therada rsensor system istempor arilyinoperat ive,e.g. due to
electr omagnet icradiation emittedbynearby TVorradio
stat ions orother sources ofelectr omagnet icradiation.
R the system isoutside theoperatin gtemper aturerange.
R The on-board voltage istoo low.
Aw arning tone also soun ds.
If th edispl aymes sage does notd isappear:
X Pull over andstop the vehic lesafely assoon aspossible ,paying
att ent ion toroad andtraffic conditio ns.
X Apply theelect ricpark ingbrak e.
X Clean theDISTRON ICPLUS coverinthe radiat orgrille
(Y page 322).
X Clean thebumper s(Y page 322).
X Restar tthe engine.
If the system detectsthat thesensors arefully operational, the
displa ymessage disappears.
DIS TRONIC isoperational again. DISTRONIC
PLUS Inoperative DIS
TRONIC PLUSisdefective. BASPLUS (Brake AssistPLUS) and
PRE-SA FE®
Brake maybeinoperative aswell.
Aw arning tone also soun ds.
X Visi taqu alified specialist workshop. DISTRO
NICPLUS Passiv
e You
have depressed theacceler atorpedal. DISTRONIC PLUSisno
longer controlling thespeed ofthe vehicle.
X Take yourfootoffthe acceler atorpedal. DISTRO
NICPLUS ---
mph An
activ ation condition forDIS TRONIC PLUSisnot fulfilled.
X Check theactiv ation condition sfor DIS TRONIC PLUS
(Y page 169). 262
Display
messagesOn-board computer and displays