2012 MERCEDES-BENZ M-Class TPMS

Tire
s Pro
blem Po
ssible cause s/consequ encesand M So
luti ons h
USA
only:
The yellow tire pressu re
moni torwarnin glamp
(p res sure loss/
ma lfunctio n)islit.
Ca nad aonl y:
The yellow tire pressu re
moni torwarnin glamp
(p res sure loss) islit. G
Ris
kofacciden t The
tirepres sure monitorh as det ectedaloss ofpres sure inat
least oneof thetir es.
X Stop theveh icle without makingany sudde nstee ring orbra king
ma neu vers.Pa yatte ntiontothe traffic conditionsasyou doso.
X Observe theadditional displaymessages inthe multifunct ion
display .
X Check thetire pressure. Ifnecessary, correctthe tire pressure
(Y page 359).
X Ifnecessary, changeawheel (Ypage 374). h
USA
only:
The yellow tirepressure
monit orwarning lamp
(pressure loss/
malfunct ion)flashes for
60 seconds andthen
remains lit. The
tirepressure monitorisfaulty.
X Observe theadditional displaymessages inthe multifunct ion
display .
X Visit aquali fiedspecialist workshop. G
WARNIN
G Each
tire,including thespare (ifprovided), shouldbecheck edatleast every twoweeks when
cold andinflated tothe pressure recommen dedbythe vehicle manufacturer onthe Tire and
Loading Information placard onthe driver's doorB-pillar or,ifavailab le,the tire pressure label
on the inside ofthe fuel filler flap.Ifyour vehicle hastires ofad iffer entsize than thesize indic ated
on the Tire andLoadin gInf ormat ionplacard orthe tirepress urelabel, youshould determin ethe
proper tirepress ureforthosetires.
As anadded safetyfeat ure, your vehic lehas been equipped withatir epress uremon itoring
syst em(TPMS )that illuminat esalow tirepress uretelltalewhen oneormore ofyour tires are
sign ifican tlyunder inflated. Accor dingly, whenthelow tirepress uretellt aleilluminat es,you should
sto pand chec kyour tires assoon aspossible, andinflate themtothe proper pressure. Driving
on asignificant lyunderinflated tirecauses thetire tooverheat andcanlead totire failure.
Underinf lationalsoreduces fuelefficienc yand tiretread life,and may affect thevehicle's handling
and stopping ability.PleasenotethattheTPMS isnot asubstitute forproper tiremainten ance,
and itis the driver's responsibility tomaintain correcttire press ure,even ifunder inflation has
not reach edthe level totrigger illuminat ionofthe TPMS lowtirepress uretelltale.
USA only:
Your vehic lehas also been equipped withaTPMS malfun ction indic atortoindic atewhen the
syst emisnot operat ingproper ly.The TPMS malfun ction indic atoriscom bined withthelow tire
press uretellt ale. When thesyst emdete ctsa malfun ction, thetellt alewill flash forapprox imately
1m inuteand thenremain continuously illuminated. Thissequence willberepeated everytime 280
War
ning andindicator lampsin theinstr ument clusterOn-board computer and displays

the
vehicleis sta rted aslong asthe malfunctio nexists. Whe nthe malfunction indicatoris
illu minated, thesystem maynotbeable todetect orsignal lowtirepressure asintended.
TPMS malfunctions mayoccur foravariety ofreasons, including theinstallation ofincompatible
replacement oralternate tiresorwheels onthe vehicle thatprevent theTPMS fromfunctioning
properly. AlwayschecktheTPMS malfunction telltaleafterreplacing oneormore tiresorwheels
on your vehicle toensure thatthereplacement oralternate tiresandwheels allowtheTPMS to
cont inue tofunct ionproperly. War
ning andindicator lampsin the instrum entcluster
281On-board computer and displays Z

If
you wish tocancel theres tart:
X Pre ssthe% button.
or
X Ifth e Tir
ePre ssureNow OK? mes
sage
appear s,pre ss9 or: tosele ct Can
cel .
X Pre ssthea button.
The tirepre ssur evalues store dat thelast
res tartw illcon tinue tobe mon itored. Tir
epr essur emonit or
Imp ortant safety notes If
atir epress uremon itorsyst emisinst alled,
the vehic le'swheels havesensors that
mon itorthetirepress uresinall four tires. The
tir epress uremon itorwarns youifthe
press uredrops inone ormor eof the tires. The
tir epress uremon itoronly functionsif the
cor rectwheel electronic sunits areinstalled
on allwheels.
The tirepressure monitorhasayell ow
warning lampinthe instrumen tcluster for
indicating pressureloss/malfunction s(USA)
or pressure loss(Canada ).Whether the
warning lampflashes orlights upindicates
whether atire pressure istoo low orthe tire
pressure monitorin gsystem is
malfunctionin g:
R ifthe warning lampislit cont inuously ,the
tire pressure onone ormore tiresis
significantly toolow. Thetirepressure
monitor isnot malfunctionin g.
R USA only: ifthe warning lampflashes for
60 seconds andthen remains litconst antly,
the tire pressure monitorismalfunctionin g. G
WARNING Each
tire,including thespare (ifprovided),
should becheck edatleast once amont h
when coldandinflated tothe pressure
recommen dedbythe vehicle manufacturer
on the Tire andLoading Informationplacard
on the driver's doorB-pillar orthe tire
pressure labelonthe inside ofthe fuel filler flap.
Ifyour vehicle hastires ofadifferent size
than thesize indicated onthe Tire andLoading
Inform ationplacard orthe tire pressure label,
you should determine theproper tirepressure
for those tires.
As anadded safetyfeature, yourvehicle has
been equipp edwith atire pressure monitorin g
system (TPMS)thatilluminates alow tire
pressure telltalewhenoneormore ofyour
tires aresignificantly underinflated.
Acc ordingly, whenthelow tirepressure
telltale illuminates, youshould stopandcheck
your tires assoon aspossible, andinflate
them tothe proper pressure. Drivingona
significantly underinflated tirecauses thetire
to overheat andcanlead totire failure.
Underinflation alsoreduces fuelefficiency
and tiretread life,and may affect thevehicle's
handling andstopping ability.
Please notethattheTPMS isnot asubstitute
for proper tiremaintenanc e,and itis the
driver's responsibility tomaintain correcttire
pressure, evenifunderinflation hasnot
reached thelevel totrigger illumination ofthe
TPMS lowtirepressure telltale.
USA only:
Your vehicle hasalso been equipp edwith a
TPMS malfunction indicatortoindicate when
the system isnot operating properly.The
TPMS malfunction indicatoriscombined with
the low tirepressure telltale.Whenthe
system detects amalfunction, thetelltale will
flash forapproximately oneminute andthen
remain continuously illuminated. This
sequence willberepeated everytimethe
vehicle isstarted aslong asthe malfunction
exists.
When themalfunction indicatorisillu minated,
the system maynotbeable todetect orsignal
low tirepressure asintended. TPMS
malfunctions mayoccur foravariety of
reasons, including theinstallation of
incompatible replacementoralternate tires
or wheels onthe vehicle thatprevent the
TPMS fromfunctioning properly. Always
check theTPMS malfunction telltaleafter Tire
pressure
359Wheels and tires
Z

repla
cingoneormore tiresorwhee lson you r
vehicl eto ensure thattherepla cement or
alterna tetires andwhee lsall ow the TPMS to
continue tofunction properly. i
USA
only:
If the tire pressu remonitor is
malfu nctioning, itmay take more than
10 minutes forthe tire pressu rewarni ng
lamp toinform youofthe malfu nction by
flas hing for60seconds andthen remai ning
lit.
When themalfu nction hasbeen rectified ,
the tire pressu rewarni nglamp goesout
after drivingfor afew minutes.
Information ontire pressu resisdisp layed in
the multi function display.After afew minutes
of drivi ng,the current tirepress ureofeach
tire isshow nint he multifunction display. i
The
tirepressure valuesindicated bythe
on-board computer maydiffer fromthose
measured atagas station withapressure
gauge. Thetirepressures shownbythe on-
board computer refertothose measured at
sea level. Athigh altitudes, thetire pressure
values indicated byapressure gaugeare
higher thanthose shown bythe on-board
computer. Inthis case, donot reduce the
tire pressures. i
The
operation ofthe tire pressure monitor
can beaffected byinterfer encefromradio
transmit tingequipment (e.g.radio
headphones, two-wayradios)thatmay be
being operated inor near thevehicle. i
USA
only:
This device complies withPart15ofthe
FCC Rules. Operation issubject tothe
following twocondition s:
1. This device maynotcause interfer ence,
and
2. this device mustaccept anyinterfer ence
received, includinginterferencethatmay
cause undesired operation. Any
unauthorized modificationtothis
device couldvoidtheuser’s authority to
operate theequipment. i
Canada
only:
This device complies withRSS-2 10of
Industry Canada.Operation issubjec tto
the followi ng two cond itions :
1. Thisde vice ma ynot causeinte rferenc e,
and
2. thi sde vice mu stacc eptany inte rference
rece ived,incl uding inte rference thatm ay
caus eunde sired oper ationofthe device.
Any unauthorized modificationtothis
device couldvoidtheuser’s authority to
operate theequipment.
Checking tirepressur eelec tronically X
Make surethattheSmartK eyisin position
2 (Y page 139)inthe ignition lock.
X Press the= or; button onthe
steering wheeltoselect the Serv. menu.
X Press the9 or: button toselect Tire
Pressure .
X Press thea button.
The current tirepressure foreach wheel will
be displa yedinthe multifunction display.
If the vehicle hasbeen parked forlonger than
20 minutes, the Tire
pressure willbe displayed
afterdriving afew minutes message
appearsinthe displa y.
Aft erateach-in period,thetire pressure
monitor automatically recognizesnew wheels
or new sensors. Ifac lear allocat ionofthe tire
press urevalues tothe indiv idual wheels isnot
possible ,the Tire
Pressure Monitor Acti
ve mess
ageisshown instead ofthe tire
press uredisplay. Thetirepress uresare
already beingmonitored. i
If
aspare wheel/ emergencyspare wheel
is moun ted,thesyst emmay continue to
show thetirepress ureofthe wheel thathas
been removedforafew minutes .If this
occ urs, notethat thevalue displayed for
the posit ionwhere thespare tireis 360
Tir
epr essur eWheels and tires