workshop MERCEDES-BENZ M-Class 2012 W166 Repair Manual

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

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions Cru
ise Control Ino
perative Cruis
eco ntrol isdef ective.
X Vis itaqualif iedspecialist wor kshop . Cru
ise Control ---
mph Ac
ondition foractivatin gcruise controlhas notbeen fulfilled.
You attempt edtosave aspeed ofless than 20mph (30km/ h).
X Ifthe situation allows,drivefaster than20mph (30k m/h )and
save thespee d.
X Check theactivati onconditions forcruise control
(Y pag e167). Tires
G
WARNING Do
not drive withaflat tire. Aflat tire affects theability tosteer orbrake thevehicl e.You may
lose control ofthe vehicl e.Continue ddrivi ngwith aflat tire willcause excessive heatbuild-up
and possi blyafire. G
WARNING Follo
wrecommended tireinfla tion pressu res.
Do not underi nflatetires.Underinfla tedtires wearexcess ivelyand /or unevenl y,ad vers elyaff ect
ha ndl ing and fueleco nomy ,and aremore likel yto failfrom being overheated.
Do not overinflate tire s.Ove rinflated tirescan advers elyaff ect handl ing and ridecomfo rt,we ar
une venl y,incre asestop ping dista nce, andresulti ns udden deflation (blowo ut)bec ause they are
mor elik ely tobec ome punctured ordamag edbyroad debris,pot hole set c. Disp
laymes sages Possi
blecauses/cons equences andM Solu
tions Tir
epre ssu res wil
lbe dis played aft
erdrivin ga few
minute s The
tirepres sure monitorismeasuring thetire pressure.
X Drive on.
The tirepressures appearint he multifunction displayafter you
have been drivingfor afew minutes . Tire Press. Monito
r Inoper
ative The
tirepress uremonitor isdefecti ve.
X Visi taqu alified specialist workshop. Tire Press. Monito
r Inoper
ative No Wheel
Sensor s The
wheels mounteddo not have asuitable tirepressure sensor.
The tirepressure monitorisdeactiv ated.
X Mount wheels withsuitable tirepressure sensors.
The tirepressure monitorisactiv ated automatic allyafter drivin g
for afew minut es. Display
messages
263On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions Che
ck Tir
es G
Ri
sk ofacci dent The
tire pre ssur ein on eor mor etires has dropped signific ant ly.
The whee lpos ition isdisp layed inthemult ifunction disp lay.
Aw arning tone also soun ds.
X Stop theveh icle without makingany sudde nstee ring orbra king
ma neu vers.Pa yatte ntiontothe traffic conditionsasyou doso.
X Correct thetire pressure (Ypage 359).
X Ifnecessary, changeawheel (Ypage 374). Caution:
Tire
Malfunction G
Risk
ofaccident The
tirepressure inone ormore tireshasdropped suddenly. The
wheel position isdisplay edinthe multifunct iondisplay .
X Stop thevehicle without makinganysudden steeringor braking
maneuvers. Payatten tiontothe traffic conditionsasyou doso.
X Ifnecessary, changeawheel (Ypage 374). Correct
Tire
Pressure The
tirepressure istoo low inat least oneofthe tires orthe tire
pressure differencebetween thewheels istoo great.
X Check thetire pressures atthe next opportunit y.Ifnecessary,
correc tthe tire pressure (Ypage 359).
X Restart thetire pressure monitor(Y page 361). Tire
Press. Sensor(s)
Missing There
isno signal fromthetire pressure sensorofone orseveral
wheels. Thepressure ofthe affect edtire isnot display edinthe
multifunct iondisplay .
X Have thedefectiv etire pressure sensorreplaced ataq ualifi ed
spec ialist workshop. Tir
e Pre
ss. Mon
itor Cur
rently Unavail. Due
toasour ceofradio interf ere nce, no sign alscan berec eive d
fr om thewheel sensors.The tire pre ssur emon itor istempo rarily
malf unction ing .
X Dr ive on.
The tire pre ssur emon itor res tartsauto maticallyas soo nasthe
problem hasbeen solved. h
Tire
Press. Warning
Caution Tire
Malfunction G
Risk
ofaccident The
tirepressure inone ormore tireshasdropped suddenly .
Aw arning tone also soun ds.
X Stop theveh icle without makingany sudde nstee ring orbra king
ma neu vers.Pa yatte ntiontothe traffic conditionsasyou doso.
X Ifnecessary, changeawheel (Ypage 374). 264
Display
messagesOn-board computer and displays

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions h
Che
ck Tir
e Pre
ssure G
Ri
sk ofacci dent The
tire pre ssur ein on eor mor etires has dropped signific ant ly.
X Stop theveh iclewit hout makingany sudd ensteer ingor brak ing
man euve rs.P ay attentio ntothe traffic conditionsasyou doso.
X Ifnecessary, changeawheel (Ypage 374).
X Check thetire pressure. Ifnecessary, correctthe tire pressure
(Y page 359). h
Correct
Tire Pressure The
tirepressure istoo low inat least oneofthe tires orthe tire
pressure differencebetween thewheels istoo great.
X Check thetire pressures atthe next opportunit y.Ifnecessary,
correc tthe tire pressure (Ypage 359). Vehicle
Display
messages Possible
causes/conse quencesandM Solutions
Shift to 'P' or 'N'
to
Start Engine You
have attempt edtostart theengine withthetrans mission in
position Ror D.
X Shift thetrans mission toposition Por N. Auxiliary
Battery Malfunction The
auxilia rybattery forthe automatic transmission isno longer
being charged.
X Visit aquali fiedspecialist workshop atthe next opportunit y.
X Unt ilthen ,set the automatic transmission toposition Pbefore
you switch offthe engine.
X Before leaving thevehicle, applytheelectric parking brake. Apply
Brake to Shift
from'P' You
have attempt edtomove thetrans mission selector leverto
position D,Ror Nwithout depressing thebrake pedal.
X Depress thebrake pedal. Door
Open Vehicle
Notin'P' The
driver's doorisopen andthetrans mission isin position R,N
or D.
Aw arning tone also soun ds.
X Sh ift thetrans mis sion toposi tionP.
X Ap ply theelec tric park ingbrak e. Displ
aymes sages
265On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions Ser
viceReq uired Do Not Shi
ft Gea
rs Vis
itDealer You
cannotchange thetransmission positionduetoamalfunction.
Aw arning tone also soun ds.
If trans mis sion positionD is selec ted:
X Dr ive toaqualifi edspec ialist workshopwit hout shiftingth e
tr ans mis sion from posi tionD.
If trans mis sion positionR, Nor Pis selec ted:
X Not ifyaqualifi edspec ialist workshopor break down service. Onl
yShi ft to
'P' when Veh
icleis Sta
tionary The
vehicle ismov ing.
X Pull overand stop thevehiclesa fel yas soo naspossible ,pay ing
attent iontoroad andtraffic conditions.
X Shift thetransmission toposition P. A The
tailgate isopen.
X Close thetailgate. ? G
Risk
ofaccident The
hood isopen.
X Pull over andstop thevehicle safelyassoon aspossible ,pay ing
attent iontoroad andtraffic conditions.
X Apply theelectric parking brake.
X Close thehood. C At
least onedoor isopen.
X Close allthe doors. D
Power
Steering Malfunction
See Operator's
Manual G
Risk
ofaccident The
power steering ismalfunctioning.
You willneed touse more forcetosteer.
Aw arning tone also soun ds.
X Chec kwhether youareable toapply theextr aforce required.
X Ifyou areable tosteer safely: carefully driveontoaqual ified
specialist workshop.
X Ifyou areunable tosteer safely: donot drive on.Contact the
nearest qualified specialist workshop. 266
Display
messagesOn-board computer and displays

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions Pho
neNoSer vice Your
vehicleis out side thene twork provider'strans mitter/
rec eiverran ge.
X Wait untilth emob ilepho neoper ationalread iness sym bol
appea rsinthemult ifunction disp lay. ¥
Che
ckWasher Fluid The
wash erflui dlev elin thew asher fluidreservoir has dropped
below themin imum .
X Ad dwashe rfluid (Y page 315). Sma
rtKey Displa
ymessag es Possibl
ecaus es/conseq uencesandM Solut
ions +
Key
DoesNot Bel
ong toVehicle You
have putthewron gSm artKey intheign itio nlock.
X Use thecorrec tSmart Key. +
Take Your Key from
Ignition The
Smart Keyisin the ignition lock.
X Remove theSmart Key. +
Obtain
aNew Key The
Smart Keyneeds tobe replaced.
X Visit aquali fiedspecialist workshop. +
Replace Key Battery The
batteries ofthe KEYLE SS-GO key aredischarged.
X Change thebatteries (Ypage 75). +
Don't
Forget Your Key The
display message isshown foramaximum of60 seconds and
is only areminder.
You have opened thedriver's doorwiththeengine switched off.
The KEYLE SS-GO key isnot inthe ignition lock.
X Remember totake theKEYLE SS-GO key with youwhen you
leave thevehicle. Display
messages
267On-board computer and displays Z

Disp
laymessa ges Poss
iblecauses/c onseq uences and M Solu
tions +
Key
NotDetected (re
ddisp laymes sage ) The
KEYLE SS-GO keyis no tin theveh icle.
Aw arning tone also soun ds.
If th een gin eis swit ched off,you can nolonger lockthe vehicle
cent rally orstart theengine.
X Pull over andstop thevehicle safelyassoon aspossible, paying
attent iontoroad andtraffic condition s.
X Apply theelectric parking brake.
X Locate theKEYLE SS-GO key. The
KEYLE SS-GO key isnot detect edwhile theengine isrunning
because thereisinterfer encefromastron gsource ofradio waves.
Aw arning tone also soun ds.
X Pull overand stop thevehiclesa fel yas soo naspossible ,pay ing
attent iontoroad andtraffic conditions.
X Engage theelectric parking brake.
X Operate thevehicle withtheSmartKey inthe ignition lock. +
Key
NotDetected (White
display
message) The
KEYLES S-GOkeycannot bedetected atpresent.
X Change thelocation ofthe key with theKEYLES S-GOfunction s
in the vehicle.
If the KEYLES S-GOkeyisstill notdetected:
X Operate thevehicle withtheSmartKey inthe ignition lock. +
Key
Detected in Vehicle The
KEYLES S-GOkeyhas been detected insidethevehicle during
locking.
X Remove theKEYLES S-GOkeyfrom thevehicle. +
Remove
'Start' Button
andInsert Key KEYLES
S-GOistemporarily malfunctioning orisdefective. A
warning tonealsosounds.
X Insert theSmartKey intotheignition lockandturn itto the
desired position.
X Visit aqual ified speciali stworkshop. +
Close
Doorsto Lock
Vehicle At
least onedoor isopen. Awarning tone also soun ds.
X Close alldoor sand lockthe vehicle again. 268
Display
messagesOn-board computer and displays

Safety
systems Problem Possible
causes/co nsequences andM Solutions
$
(USAonly)
J (Canada only)
The redbrake system
warning lampcomes on
while theengine is
running. Awarning tone
also sounds. G
Risk
ofaccident The
brake boosting effectismalfunction ingand thebraking
characterist icsmay beaffected.
X Pull over andstop thevehicle safelyassoon aspossible, paying
atten tiontoroad andtraffic condition s.Do not cont inue driving
under anycircumst ances.
X Engage theelectric parking brake.
X Consult aqual ified specialist workshop.
X Observe theadditional displaymessages inthe multifunct ion
display . $
(USAonly)
J (Canada only)
The redbrake system
warning lampcomes on
while theengine is
running. Awarning tone
also sounds. G
Risk
ofaccident There
isnot enough brakefluidinthe brake fluidreservoir.
X Pull over andstop thevehicle safelyassoon aspossible, paying
atten tiontoroad andtraffic condition s.Do not cont inue driving
under anycircumst ances.
X Engage theelectric parking brake.
X Consult aqual ified specialist workshop immediately.
X Observe theadditional displaymessages inthe multifunct ion
display .
Do not add brake fluid.Thiswillnotrectify themalfunction . G
WARNING Driving
withthebrake warning lampilluminated canresult inan accident. Haveyourbrake system
check edimmediately ifthe brake warning lampstays on.Donot add brake fluidbefore checking
the brake system.
Overfilling thebrake fluidreservoir canresult inspilling brakefluidonhot engine partsandthe
brake fluidcatchin gfire. Youcanbeseriously burned. War
ning andindicator lampsin the instrum entcluster
271On-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