When you have mounted the M+S tires:
XCheck the tire pressures (Ypage 307).
XRestart the tire pressure monitor (USA only)(Ypage 314).
XRestart the tire pressure loss warning sys-tem (Canada) (Ypage 311)
Snow chains
GWARNING
If snow chains are mounted on the rear
wheels, the snow chains could cause abra-
sion to the vehicle body or to chassis com-
ponents. This could cause damage to the
vehicle or the tires. There is a risk of an
accident.
To avoid hazardous situations:
Rnever mount snow chains on the rear
wheels
Ronly mount snow chains in pairs on the
front wheels.
!On some tire sizes there is not enoughspace for snow chains. To avoid damage tothe vehicle or tires, observe the "Wheel andtire combinations" section under "Tires andwheels".
For safety reasons, Mercedes-Benz recom-mends that you only use snow chains thathave been specially approved for your vehicleby Mercedes-Benz, or are of a correspondingstandard of quality. For more information,please contact a qualified specialist workshop.
If you intend to mount snow chains, pleasebear the following points in mind:
RSnow chains may not be mounted on allwheel/tire combinations. Permissiblewheel-tire combinations (Ypage 329).
ROnly use snow chains when driving on roadscompletely covered by snow. Remove thesnow chains as soon as possible when youcome to a road that is not snow-covered.
RLocal regulations may restrict the use ofsnow chains. Observe the appropriate regu-lations if you wish to mount snow chains.
RDo not exceed the maximum permissiblespeed of 30mph (50 km/h).
RIf snow chains are installed, you cannot useActive Parking Assist (Ypage 176).
You may wish to deactivate ESP®when pullingaway with snow chains installed . This allowsthe wheels to spin in a controlled manner, ach-ieving increased propulsive force (cuttingaction).
RDeactivate ESP®(all vehicles exceptMercedes-AMG vehicles) (Ypage 64)
RDeactivate ESP®(Mercedes-AMG vehicles)(Ypage 65)
Information about driving with an emergencyspare wheel (Ypage 330).
Tire pressure
Tire pressure specifications
Important safety notes
GWARNING
Underinflated or overinflated tires pose the
following risks:
Rthe tires may burst, especially as the load
and vehicle speed increase.
Rthe tires may wear excessively and/or
unevenly, which may greatly impair tire
traction.
Rthe driving characteristics, as well as
steering and braking, may be greatly
impaired.
There is a risk of an accident.
Follow recommended tire inflation pressures
and check the pressure of all the tires
including the spare wheel:
Rmonthly, at least
Rif the load changes
Rbefore beginning a long journey
Runder different operating conditions, e.g.
off-road driving
If necessary, correct the tire pressure.
iThe data on the Tire and Loading Informa-tion placard and tire pressure table shownhere are examples. Tire pressure specifica-
Tire pressure307
Wheels and tires
Z
tions are vehicle-specific and may deviatefrom the data shown here. The tire pressurespecifications that are valid for your vehiclecan be found on the Tire and Loading Infor-mation placard and tire pressure table onthe vehicle.
General notes
The recommended tire pressures for the tiresmounted at the factory can be found on thelabels described here.
Operation with an emergency spare wheel:information on operation with an emergencyspare wheel can be found in the general notesin the "Emergency spare wheel" section(Ypage 329).
Further information on tire pressures can beobtained at a qualified specialist workshop.
Tire and Loading Information placard
CRecommended tire pressures
The Tire and Loading Information placard is onthe B-pillar on the driver's side (Ypage 316).
The Tire and Loading Information placard con-tains the recommended tire pressures for coldtires. The recommended tire pressures arevalid for the maximum permissible load and upto the maximum permissible vehicle speed.
Tire pressure table
The tire pressure table is on the inside of thefuel filler flap. It shows the tire pressure for alltires permitted at the factory for this vehicle;see illustration (example).
The tire pressure table contains the recom-mended pressures for cold tires for variousoperating conditions, i.e. differing load andspeed conditions.
If a tire size precedes a tire pressure, the fol-lowing tire pressure information is only validfor that tire size; see illustration (example).
The load conditions "partially laden" and "fullyladen" are defined in the table for differentnumbers of occupants and amounts of lug-gage. The actual number of seats may differ.
Some tire pressure tables show only the rimdiameters instead of the full tire size, e.g.R18.Rim diameter is part of the tire size and can befound on the tire sidewall (Ypage 320).
308Tire pressure
Wheels and tires
rotation of a wheel changes as a result of aloss of pressure, a corresponding warningmessage will appear in the multifunction dis-play.
You can recognize the tire pressure loss warn-ing by theRun Flat Indicator ActiveRun Flat Indicator ActivePress 'OK' to RestartPress 'OK' to Restartmessage in the mul-tifunction display in theServ.Serv.menu. Informa-tion on the message display can be found inthe "Restarting the tire pressure loss warning"section (Ypage 311).
Important safety notes
The tire pressure warning system does notwarn you of an incorrectly set tire pressure.Observe the notes on the recommended tirepressure (Ypage 307).
The tire pressure loss warning does notreplace the need to regularly check the tirepressure. An even loss of pressure on severaltires at the same time cannot be detected bythe tire pressure loss warning system.
The tire pressure monitor is not able to warnyou of a sudden loss of pressure, e.g. if thetire is penetrated by a foreign object. In theevent of a sudden loss of pressure, bring thevehicle to a halt by braking carefully. Avoidabrupt steering movements.
The function of the tire pressure loss warningsystem is limited or delayed if:
Rsnow chains are mounted on your vehicle'stires.
Rroad conditions are wintry.
Ryou are driving on sand or gravel.
Ryou adopt a very sporty driving style (corner-ing at high speeds or driving with high ratesof acceleration).
Ryou are driving with a heavy load (in thevehicle or on the roof)
Restarting the tire pressure loss warn-
ing system
Restart the tire pressure loss warning systemif you have:
Rchanged the tire pressure
Rchanged the wheels or tires
Rmounted new wheels or tires
XBefore restarting, make sure that the tirepressures are set properly on all four tiresfor the respective operating conditions.
The recommended tire pressure can befound on the Tire and Loading Informationplacard on the B-pillar. Additionally, a tirepressure table is attached to the fuel fillerflap. The tire pressure loss warning systemcan only give reliable warnings if you haveset the correct tire pressure. If an incorrecttire pressure is set, these incorrect valueswill be monitored.
XAlso observe the notes in the section on tirepressures (Ypage 307).
XMake sure that the SmartKey is in position Hin the ignition lock (Ypage 125).
XPress Yor eon the steering wheelto select theServ.Serv.menu.
XPress the cor dbutton to selectTire PressureTire Pressure.
XPress the vbutton.TheRun Flat Indicator Active PressRun Flat Indicator Active Press'OK' to Restart'OK' to Restartmessage appears in themultifunction display.
If you wish to confirm the restart:
XPress the vbutton.TheTire Pressure Now OK?Tire Pressure Now OK?messageappears in the multifunction display.
XPress the cor dbutton to selectYesYes.
XPress the vbutton.TheRun Flat Indicator RestartedRun Flat Indicator Restartedmes-sage appears in the multifunction display.
After a teach-in period, the tire pressureloss warning system will monitor the set tirepressures of all four tires.
If you wish to cancel the restart:
XPress the 8button.
or
XIf theTire Pressure Now OK?Tire Pressure Now OK?messageappears, press the cor dbutton toselectCancelCancel.
XPress the vbutton.The tire pressure values stored at the lastrestart will continue to be monitored.
Tire pressure monitor (Canada only)
General notes
If a tire pressure monitor is installed, the vehi-cle's wheels have sensors that monitor the tirepressures in all four tires. The tire pressure
Tire pressure311
Wheels and tires
Z
monitor warns you if the pressure drops in oneor more of the tires. The tire pressure monitoronly functions if the corresponding sensorsare installed in all wheels.
Information on tire pressures is displayed inthe multifunction display. After a few minutesof driving, the current tire pressure of each tireis shown in theServ.Serv.menu of the multifunc-tion display, see illustration (example).
For information on the message display, referto the "Checking the tire pressure electroni-cally" section (Ypage 313).
Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once every two
weeks when cold and inflated to the pres-
sure recommended by the vehicle manufac-
turer on the Tire and Loading Information
placard on the driver's door B-pillar or the
tire pressure label on the inside of the fuel
filler flap. If your vehicle has tires of a differ-
ent size than the size indicated on the Tire
and Loading Information placard or, if availa-
ble, the tire pressure label, you should
determine the proper tire pressure for those
tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitor-
ing system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires are significantly underinflated. Accord-
ingly, when the low tire pressure telltale
lights up, you should stop and check your
tires as soon as possible, and inflate them to
the proper pressure. Driving on a signifi-
cantly underinflated tire causes the tire to
overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehi-
cle's handling and stopping ability. Please
note that the TPMS is not a substitute for
proper tire maintenance, and it is the driv-
er's responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of
the TPMS low tire pressure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate
when the system is not operating properly.
The TPMS malfunction indicator is combined
with the low tire pressure telltale. When the
system detects a malfunction, the warning
lamp will flash for approximately a minute
and then remain continuously illuminated.
This sequence will be repeated every time
the vehicle is started as long as the malfunc-
tion exists. When the malfunction indicator
is illuminated, the system may not be able to
detect or signal low tire pressure as inten-
ded.
TPMS malfunctions may occur for a variety
of reasons, including the installation of
incompatible replacement or alternate tires
or wheels on the vehicle that prevent the
TPMS from functioning properly. Always
check the TPMS malfunction telltale after
replacing one or more tires or wheels on
your vehicle to ensure that the replacement
or alternate Tires and wheels allow the
TPMS to continue to function properly.
It is the driver's responsibility to set the tirepressure to that recommended for cold tireswhich is suitable for the operating situation(Ypage 307). Note that the correct tire pres-sure for the current operating situation mustfirst be taught-in to the tire pressure monitor.If a substantial loss of pressure occurs, thewarning threshold for the warning message isaligned to the taught-in reference values.Restart the tire pressure monitor after adjust-ing the pressure of the cold tires(Ypage 314). The current pressures aresaved as new reference values. As a result, awarning message will appear if the tire pres-sure drops significantly.
312Tire pressure
Wheels and tires
Observe the instructions and safety notes inthe display messages in the "Tires" section(Ypage 223).
If the wheel positions on the vehicle are rota-ted, the tire pressures may be displayed forthe wrong positions for a short time. This isrectified after a few minutes of driving, and thetire pressures are displayed for the correctpositions.
Restarting the tire pressure monitor
When you restart the tire pressure monitor, allexisting warning messages are deleted and thewarning lamps go out. The monitor uses thecurrently set tire pressures as the referencevalues for monitoring. In most cases, the tirepressure monitor will automatically detect thenew reference values after you have changedthe tire pressure. However, you can also setreference values manually as described here.The tire pressure monitor then monitors thenew tire pressure values.
XSet the tire pressure to the value recom-mended for the corresponding driving situa-tion on the Tire and Loading Informationplacard on the driver's sideB-pillar (Ypage 307).
You can find more tire pressure values forvarious operating conditions in the tire pres-sure table inside the fuel filler flap(Ypage 144).
XMake sure that the tire pressure is correcton all four wheels.
XMake sure that the SmartKey is in position Hin the ignition lock (Ypage 125).
XPress Yor eon the steering wheelto select theServ.Serv.menu.
XPress the cor dbutton to selectTire PressureTire Pressure.
XPress the vbutton.The multifunction display shows the currenttire pressure for each tire or theTireTirepressure will be displayed afterpressure will be displayed afterdriving a few minutesdriving a few minutesmessage.
XPress the dbutton.The multifunction display shows theUseUseCurrent Pressures as New ReferenceCurrent Pressures as New ReferenceValuesValuesmessage.
If you wish to confirm the restart:
XPress the vbutton.TheTire Press. Monitor RestartedTire Press. Monitor Restartedmessage appears in the multifunction dis-play.
After driving for a few minutes, the systemchecks whether the current tire pressuresare within the specified range. The new tirepressures are then accepted as referencevalues and monitored.
If you wish to cancel the restart:
XPress the 8button.The tire pressure values stored at the lastrestart will continue to be monitored.
314Tire pressure
Wheels and tires
Radio type approval for the tire pres-
sure monitor
CountryRadio type approval number
USAFCC ID: MRXMW2433A
FCCIC ID:MRXGG4 This devicecomplies with part 15 of theFCC rules and with licenseexempt RSS standards of Indus-try Canada. Operation is subjectto the following conditions. (1)This device may not causeharmful interference, and (2)This device must accept anyinterference received, includinginterference that may causeundesired operation. Le presentappareil est conforme d'indus-trie Canada applicables auxappareils radio exempts delicence. L'exploitation estauthorisee aux deux conditionssuivantes. (1). L'appareil ne doitpas produire de brouillage, et(2) L'autisateur de l'appareildoit accepter tout brouillageradioelectrique subi, meme si lebrouillage est susceptible d'encompromettre le fonctionne-ment. WARNING: Changes ormodifications not expressivelyapproved by the party responsi-ble for compliance could voidthe users authority to operatethe equipment. The term "IC:"before the radio certificationnumber only signifies Canadatechnical specifications weremet.
FCC ID:MRXMC34MA4 Thisdevice complies with part 15 ofthe FCC rules and with licenseexempt RSS standards of Indus-try Canada. Operation is subjectto the following conditions. (1)This device may not causeharmful interference, and (2)This device must accept anyinterference received, includinginterference that may causeundesired operation. Le presentappareil est conforme d'indus-trie Canada applicables auxappareils radio exempts de
CountryRadio type approval number
license. L'exploitation estauthorisee aux deux conditionssuivantes. (1). L'appareil ne doitpas produire de brouillage, et(2) L'autisatuer de l'appareildoit accepter tout brouillageradioelectrique subi, meme si lebrouillage est susceptible d'encompromettre le fonctionne-ment. WARNING: Changes ormodifications not expressivelyapproved by the party responsi-ble for compliance could voidthe users authority to operatethe equipment. The term "IC:"before the radio certificationnumber only signifies Canadatechnical specifications weremet.
CanadaIC: 2546A-MW2433A
IC:2546A-GG4 This device com-plies with part 15 of the FCCrules and with license exemptRSS standards of Industry Can-ada. Operation is subject to thefollowing conditions. (1) Thisdevice may not cause harmfulinterference, and (2) This devicemust accept any interferencereceived, including interferencethat may cause undesired oper-ation. Le present appareil estconforme d'industrie Canadaapplicables aux appareils radioexempts de license. L'exploita-tion est authorisee aux deuxconditions suivantes. (1). L'ap-pareil ne doit pas produire debrouillage, et (2) L'autisateur del'appareil doit accepter toutbrouillage radioelectrique subi,meme si le brouillage est sus-ceptible d'en compromettre lefonctionnement. WARNING:Changes or modifications notexpressively approved by theparty responsible for compli-ance could void the usersauthority to operate the equip-ment. The term "IC:" before theradio certification number onlysignifies Canada technical spec-ifications were met.
Tire pressure315
Wheels and tires
Z
CountryRadio type approval number
IC: 2546A-MC34MA4
Loading the vehicle
Instruction labels for tires and loads
GWARNING
Overloaded tires can overheat, causing a
blowout. Overloaded tires can also impair
the steering and driving characteristics and
lead to brake failure. There is a risk of acci-
dent.
Observe the load rating of the tires. The load
rating must be at least half of the GAWR of
your vehicle. Never overload the tires by
exceeding the maximum load.
Two instruction labels on your vehicle showthe maximum possible load.
(1) The Tire and Loading Information placardis on the B-pillar on the driver's side. TheTire and Loading Information placardshows the maximum permissible numberof occupants and the maximum permissi-ble vehicle load. It also contains details ofthe tire sizes and corresponding pressuresfor tires mounted at the factory.
(2) The vehicle identification plate is on the B-pillar on the driver's side. The vehicleidentification plate informs you of thegross vehicle weight rating. It is made upof the vehicle weight, all vehicle occu-pants, the fuel and the cargo. You can alsofind information about the maximum grossaxle weight rating on the front and rearaxle.
The maximum gross axle weight rating isthe maximum weight that can be carriedby one axle (front or rear axle). Neverexceed the maximum load or the maxi-mum gross axle weight rating for the frontor rear axle.
CB-pillar, driver's side
Maximum permissible gross vehicle
weight rating
XSpecification for maximum gross vehicleweight Cis listed in the Tire and LoadingInformation placard: "The combined weightof occupants and cargo should neverexceed XXX kilograms or XXX lbs."
The gross weight of all vehicle occupants, loadand luggage must not exceed the specifiedvalue.
iThe specifications shown on the Tire andLoading Information placard in the illustra-tion are examples. The maximum permissi-ble gross vehicle weight rating is vehicle-specific and may differ from that in the illus-tration. You can find the valid maximum per-missible gross vehicle weight rating for yourvehicle on the Tire and Loading Informationplacard.
316Loading the vehicle
Wheels and tires
tion, or excessive loading, either separately
or in combination, can cause excessive heat
build-up and possible tire failure.
The temperature grades are A (the highest), B,and C, representing the tire's resistance to thegeneration of heat and its ability to dissipateheat when tested under controlled conditionson a specified indoor laboratory test wheel.Sustained high temperature can cause thematerial of the tire to degenerate and reducetire life, and excessive temperature can lead tosudden tire failure. The grade C correspondsto a level of performance which all passengercar tires must meet under the Federal MotorVehicle Safety Standard No. 109. Grades Band A represent higher levels of performanceon the laboratory test wheel than the minimumrequired by law.
Tire labeling
Overview
CUniform Tire Quality Grading Standards(Ypage 323)
DDepartment of Transportation, Tire Identifi-cation Number (Ypage 322)