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allowthe TPMStocontinuetofunction prop‐erly.
The systemchecksthe tire pressure andthe tiretemperature ofthe tires installed onthevehiclebymeans of a tire pressuresensor.
New tire pressure sensors, e.g. in winter tires,are automaticallytaught-in duringthefirst jour‐neytheyare used.
The tire pressure andthe tiretemperatureappear inthe multifunction display( page 396).
Ifthere is a substantial pressure loss or ifthetiretemperature isexcessive,you will bewarnedinthefollowingways:
Rvia display messages ( page 466)
Rviathe wwarning lamp inthe instrumentcluster ( page 490)
The tire pressuremonitoring system is only anaid. It isthe driver'sresponsibilitytosetthe tirepressuretotherecommended cold tire pressuresuitableforthe operating situation. Setthe tirepressurefor cold tires using a tire pressure
gauge.Notethatthe correct tire pressureforthecurrent operating situation mustfirst betaught-intothe tire pressure monitoring system.
In most cases,the tire pressure monitoring sys‐tem will automatically updatethe newreferencevalues afteryou havechangedthe tire pressure.You can, however,also updatethereferenceval‐uesbyrestartingthe tire pressure monitoringsystem manually ( page 397).
System limitations
The system may be impaired or may not functioninthefollowing situations:
RIfthe tire pressure is set incorrectly
RIfthere is a sudden pressure loss caused,forexample,byaforeign object penetratingthetire
RIfthere is a malfunction causedbyanotherradio signal source
Make suretoobservethefollowing furtherrela‐ted subject:
RNotes on tire pressure ( page 392)
Checkingthe tire pressure withthe tire pres‐sure monitoring system
Requirements:RThe ignition is switched on.
On-board computer:
Service Tires
One ofthefollowing displaysappears:
RCurrent tire pressure and tiretemperature ofthe individual wheels:
RTire pressure will be displayed after driving afew minutes
396Wheels and tires
Page 415 of 534
of skidding orhydroplaning onwetroads isincreased.
In addition,the tire grip is greatlyreduced ata low outsidetemperature and tirerunningtemperature.
Switch onthe ESP®and adaptyourdrivingstyle accordingly.
Use M+S tire at outsidetemperaturesof lessthan10°C (50 °F).
Observethefollowing when selecting, installingandreplacing tires:
ROnly use tires and wheels ofthe same type(summer tires, winter tires, MOExtendedtires) andthe same make.
ROnly install wheels ofthe same size on oneaxle (left andright).
It is only permissibletoinstall a differentwheel size intheevent of aflat tire in ordertodrivetothe specialistworkshop.
ROnly install tires ofthe correct size ontothewheels.
RVehicles with a tire pressure monitoringsystem:All installed wheels must be equip‐ped with functioning sensorsforthe tirepressure monitoring system.
RAttemperatures below 45 °F (7 °C), use win‐ter tires or all-season tires marked M+Sforall wheels.
Winter tires bearingthe Msnowflake sym‐bol in additiontothe M+S marking providethe best possible grip in wintryroad condi‐tions.
RFor M+S tires, only use tires withthe sametread.
RObservethe maximum permissible speedforthe M+S tires installed.
Ifthis is belowthevehicle's maximum speed,this must be indicatedbyan appropriatelabel inthe driver'sfield of vision.
RBreak in new tires at moderate speedsforthefirst 60 miles (100 km).
RReplacethe tires after sixyears atthe latest,regardless ofwear.
RWhenreplacing with tires that do notfea‐turerun-flatcharacteristics:vehicles withMOExtended tires are not equipped with aTIREFIT kit atthefactory.Equipthevehiclewith a TIREFIT kit afterreplacing with tiresthat do notfeaturerun-flatcharacteristics,e.g. winter tires.
For more information on wheels and tires, con‐tact aqualified specialistworkshop.
Be suretoalso observethefollowing furtherrelated subjects:
RNotes on tire pressure ( page 392)
RTireand Loading Information placard( page 399)
RTiresize designation, load-bearing capacity,speedrating and load index( page 406)
RTirepressuretable ( page 393)
Wheels and tires413
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\nWARNING‑ Risk offireand injury fromwindshieldwasher concentrate
Windshieldwasher concentrate is highlyflammable. It could ignite if it comes intocontact withhot engine component parts ortheexhaust system.
Make surethat no windshieldwasherconcentrate spills out nexttothefilleropening.
NOTEDamagetotheexterior lightingduetounsuitable windshieldwasherfluid
Unsuitable windshieldwasherfluid may dam‐agethe plastic surface oftheexterior light‐ing.
Only use windshieldwasherfluid whichis also suitablefor use on plastic surfa‐ces, e.g. MB SummerFit or MBWinter‐Fit.
NOTEBlocked spraynozzles causedbymixing windshieldwasherfluids
Do not mix MB SummerFit and MBWin‐terFit withother windshieldwasherflu‐ids.
Do not use distilled or de-ionizedwater asthefilllevel sensor may be triggered erroneously.
Recommended windshieldwasherfluid:
RAbovefreezing point: e.g. MB SummerFit
RBelow freezing point: e.g. MBWinterFit
Forthe correct mixingratio,refertothe informa‐tion onthe antifreeze container.
Mixthewasherfluid withthe windshieldwasherfluid allyearround.
Refrigerant
Notes onrefrigerantsObservethe notes on operatingfluids( page 425).
NOTEDamageduetoincorrectrefriger‐ant
If a non-approvedrefrigerant is used,the cli‐mate control system may be damaged.
Only usetherefrigerant R‑134a
NOTEDamagetothe climate controlsystem duetoincorrectrefrigerant com‐pressor oil
Only userefrigerant compressor oilthathas been approvedbyMercedes-Benz.
Do not mixthe approvedrefrigerantcompressor oil with a differentrefriger‐ant compressor oil.
Workonthe climate control system may be car‐ried out onlybyaqualified specialistworkshop.All applicableregulations, aswell asSAEstand‐ard J639, must be adheredto.
The instruction label onthe climate control sys‐temfortherefrigerant type andtherefrigerantcompressor oil is located onthe inside ofthehood.
430Technical data
Page 442 of 534
Display messagesPossible causes/consequences and P PSolutions
(Canada only)
Check Brake Fluid Level
Consult aqualified specialistworkshop.
Do not add brakefluid.
Pullover andstopthevehicle safely as soon as possible, paying attentiontoroad and traffic conditions. Do notcontinue driving under any circumstances.
Do not add brakefluid.
Consult aqualified specialistworkshop.
Radar Sensors Dirty SeeOperator's Manual
*Theradar sensor system is malfunctioning.Possible causes are:
RDirt onthe sensors
RHeavyrain or snow
RExtended country driving withoutother traffic, e.g. inthe desert
Driving systems and driving safety systems may be malfunctioning ortemporarily unavailable.
Oncethe cause ofthe problem is no longer present, driving systems and driving safety systems will beavailableagain.
Ifthe display message does not disappear:
Pullover andstopthevehicle safely as soon as possible, paying attentiontoroad and traffic conditions.
Clean all sensors ( page 364).
Restartthe engine.
440Displaymessages andwarning/indicator lamps
Page 451 of 534
Display messagesPossible causes/consequences and P PSolutions
Blind Spot Assist CurrentlyUnavailable See Operator'sManual
*Blind Spot Assist istemporarily unavailable.
The system limits havebeenreached ( page219).
Drive on.Oncethe cause ofthe problem is no longer present,the system will beavailable again.
or
Ifthe display message does not disappear,stopthevehicle while paying attentiontoroad and traffic conditionsandrestartthe engine.
If necessary,cleantherear bumper. Ifthe bumper isextremelydirty,the sensors inthe bumper may be mal‐functioning.
Active Steering Assist Inop-erative
*ActiveSteering Assist is malfunctioning.Active Distance AssistDISTRONICremainsavailable.
Visit aqualified specialistworkshop.
Page 470 of 534
Display messagesPossible causes/consequences and P PSolutions
RThe tires maywearexcessively and/or unevenly, which may greatly impair tire traction.
RThe drivingcharacteristics, aswell assteering and braking, may be greatly impaired.
You couldthen lose control ofthevehicle.
Observetherecommended tire pressure.
Adjustthe tire pressure if necessary.
Stopthevehicle, paying attentiontoroad and traffic conditions.
Checkthe tire pressure ( page 392) andthe tires.
w
Please Correct Tire Pres-sure
*The tire pressure istoo low in at least one ofthe tires, orthe tire pressure difference betweenthe wheels istoogreat.
Checkthe tire pressure and add air, if necessary.
Whenthe tire pressure is correct,restartthe tire pressure monitoring system ( page 397).
w
Tire Press. Monitor Cur-rently Unavailable
*There is interference from a powerfulradio signal source. As aresult, no signals fromthe tire pressure sensor arereceived. The tire pressure monitoring system istemporarily unavailable.
Drive on.The tire pressure monitoring systemrestarts automatically as soon asthe cause has beenrectified.
468Display messages andwarning/indicator lamps
Page 471 of 534
Display messagesPossible causes/consequences and P PSolutions
w
Wheel Sensor(s) Missing
*The tire pressure sensor signal is missing from one or more tire(s). The pressure ofthe affected tire is not dis‐played.
Havethe defective tire pressure sensorreplaced at aqualified specialistworkshop.
w
Tire Pressure Monitor Inop-erative No Wheel Sensors
*The wheels installed do not havesuitable tire pressure sensors. The tire pressure monitoring system is deactivated.
Install wheels with suitable tire pressure sensors.
w
Tire Press. Monitor Inopera-tive
*The tire pressure monitoring system is defective.
\nWARNINGThereis arisk of an accident ifthe tire pressure monitoring system is malfunctioning
Ifthe tire pressure monitoring system is malfunctioning, it is not abletoissue awarning ifthere is pressure lossin one or more ofthe tires.
Underinflated tires may,forexample, impairthe driving,steering and brakingcharacteristics.
Havethe tire pressure monitoring systemchecked at aqualified specialistworkshop.
Visit aqualified specialistworkshop.
Tires Overheated*At least one tire isoverheating. The affected tires are displayed inred.Attemperatures closetothe limitvalue,thetires are displayed inyellow.
Displaymessages andwarning/indicator lamps469
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Display messagesPossible causes/consequences and P PSolutions
I
Switch Off Lights
*You are leavingthevehicle andthe lights arestill switched on.
Turnthe light switchtothe Xposition.
I
Malfunction See Opera-tor’s Manual
*Theexterior lighting is defective.
Visit aqualified specialistworkshop.
I
Switch On Headlamps
*You are driving without low-beam headlamps.
Turnthe light switchtothe Xor Xposition.
I
Automatic Headlamp ModeInoperative
*The light sensor isfaulty.
Consult aqualified specialistworkshop.
*Adaptive Highbeam Assist is malfunctioning.
Display messages andwarning/indicator lamps477
