MERCEDES-BENZ M-Class 2012 W166 Owner's Manual

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions X
Vis itaqualif iedspecialist wor kshop immediat ely. G
WAR
NING If
th e45 indic ato rlamp remains offeven afterperf ormingtheabove correctivest eps, do
no th ave any childre n12years oldand under andother smallindividuals usethefron t-passenger
seat until thesystem hasbeen repaired. Display
messages Possible
causes/consequences andM Solutions
Front
Passeng er Airbag
Disabl' d See
Operato r's Manual The
front-passenger airbag isdeactivat edduring thejourn eyeven
though anadult oraperson largerthanacert ainsize isoccupying
the fron t-passenger seat.Ifadditional forcesare applied tothe
seat, thesystem mayinterpret theoccupant 'sweight aslower
than itactually is.
X Pull over andstop thevehicle safelyassoon aspossible, paying
atten tiontoroad andtrafficcon ditions .
X En gage theparking brake.
X Switc hoff the ignition .
X Have theoccupant getout ofthe vehicle.
X Keep theseat unocc upied, closethefron t-passenger doorand
switch onthe ignition .
Observe the45(Y page44)indicat orlamp andthe
multifunc tiondisplay andchec kthe following:
Seat unoccupied andignition switched on:
R the 45 indicatorlampmust lightupand remain lit.When
the indicator lampison, OCS (Ypage 44)has deactivated the
front -passenger airbag.
R the Front
Passenger AirbagEnabled SeeOperator's Manual or Front
Passenger AirbagDisabled See Operator's
Manual displa
ymessages mustnotappea rint he
multifunction display.Wait foraperiod ofat least 60seconds
until thenecessary systemcheckshave been completed andto
make surethatthedispla ymessages donot appea rint he
multifunction display.
If these condition sare fulfilled ,the front -passenger seatcanbe
occupied again.Whether the45 indicatorlampremains lit
or goes outdepends onhow OCS classifies theoccupant.
If the condition sare not fulfilled ,the system isnot operating
correct ly.
X Visit aqual ified specialist workshop immediately. Display
messages
249On-board computer and displays Z

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

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions b
Che
ckRearLef t Tur
n Sig
nal or Che
ck Rea
rRig ht Turn Sig
nal The
rear left-han dor rear right-hand turns ignal isdefec tive.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Chec
kFron tLeft Turn
Sign
al or Chec
k Fron
tRigh tTurn Sign
al The
frontleft -han dor fro ntright -handtur nsign alisdefec tive.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Chec
kLeft Mirror Turn
Sign
al or Chec
k Righ
tMirr orTurn Sign
al The
turnsign alin the left-han dor right -handext erior mirroris
defec tive.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Chec
k Cent
er Brak
e Lamp The
high- moun tedbrak elamp isfaulty.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Chec
kLeft Tail and
Brake Lamp
s or Chec
k Righ
tTail and Brak
eLamp s The
leftorright -handbrak elamp isdefec tive.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. b
Chec
kLeft High Beam or Chec
k Righ
t High
Beam The
leftorright -handhigh beam isdefec tive.
X Check whetheryou areperm itted tochan gethe bulb yourself
(Y page 114).
or
X Visit aqualified specialist workshop. Display
messages
251On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions b
Lic
ensePla teLamp The
licen se plat elamp sare fault y.
X Chec kwhether youarepermitted tochange thebulb yourself
(Y page 114).
or
X Visit aqual ified specialist workshop. b
Rear
FogLamp The
rear foglamp isdefective.
X Check whether youarepermitted tochange thebulb yourself
(Y page 114).
or
X Visit aqual ified specialist workshop. b
Check
FrontLeft Parking
Lamp or Check Front
Right
Parking Lamp The
front leftorfront rightparking orstanding lampisdefective.
X Check whether youarepermitted tochange thebulb yourself
(Y page 114).
or
X Visit aqual ified specialist workshop. b
Backup
Light The
backup lampisdefective.
X Check whether youarepermitted tochange thebulb yourself
(Y page 114).
or
X Visit aqual ified specialist workshop. b
Check
FrontLeft Sidemarker
Lamp or Check Front
Right
Sidemarker Lamp The
leftorright front sidemarker lampisdefective.
X Check whether youarepermitted tochange thebulb yourself
(Y page 114).
or
X Visit aqual ified specialist workshop. b
Check
LeftTail Lamp or Check Right
Tail
Lamp The
leftorright-hand taillamp isdefective.
or
The rear leftorright sidemarker lampisdefective.
X Check whether youarepermitted tochange thebulb yourself
(Y page 114).
or
X Visit aqual ified specialist workshop. 252
Display
messagesOn-board computer and displays

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

Engine
Displ
aymes sage s Possib
lecau ses/cons equences andM Solu
tions +
Che
ckCoolant Lev
elSee Ope
rator'sMan ual The
coolant levelis toolow.
X Add coolant ,obse rving thewarn ingnoteswhen doingso
(Y page 315).
X Ifcoo lant needs tobe added moreoft en than usual, havethe
en gin ecoo lant systemcheck edataqualifie dspec ialist
work shop. G
WAR
NING Do
notspill antif reeze onhot engin eparts. Antifr eeze contains ethylene glycolwhich mayburn
if it comes intocon tact with hotengin eparts. Youcould beseriously burned.
! The coolant levelistoo low. Avoid makin glong journ eyswith toolittlecoolant inthe cooling
system. Theengin ewill other wisebedamaged.
The display messages andthecorr espondin gsymbol thatindicat ethat thecoolant levelis
too low must notbeignored. 254
Display
messagesOn-board computer and displays

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