light MERCEDES-BENZ C CLASS 2019 Owners Manual

RImpaired driving comfort
RSusceptibilitytodamage
\nWARNINGRisk of accident causedbyrepeated drop in tire pressure
Ifthe tire pressure dropsrepeatedly,thewheel,valve or tire may be damaged.
Insufficient tire pressure can causethe tirestoburst.
Inspectthe tirefor signs offoreignobjects.
Check whetherthe wheel orvalve has aleak.
Ifyou are unabletorectifythe damage,contact aqualified specialistworkshop.
You canfind information on tire pressureforthevehicle'sfactory-installed tires onthefollowinglabels:
RTireand Loading Information placard ontheB‑pillar ofyourvehicle (page 399).
RTirepressuretable onthe inside ofthe fuelfillerflap (page 393).
Observethe maximum tire pressure(page 406).
Use a suitable tire pressuregaugetocheckthetire pressure. The outer appearance of a tiredoes not permit anyreliable conclusion aboutthe tire pressure.
Vehicles with a tire pressure monitoring sys‐tem:You can alsocheckthe tire pressure usingthe on-board computer.
Only correct tire pressure whenthe tires arecold. Conditionsfor cold tires:
RThevehicle has been parked withthe tiresout of direct sunlightfor at leastthree hours.
RThevehicle has traveled lessthan 1 mile(1.6 km).
Arise inthe tiretemperature of18°F (10 °C)increasesthe tire pressurebyapprox.10kPa(0.1 bar/1.5 psi).Takethis into account whencheckingthe tire pressure ofwarmtires.
The tire pressure recommendedfor increasedload/speed inthe tire pressuretable can affecttheride comfort.
\nWARNINGRisk of accident from unsuita‐ble accessories onthe tirevalves
Ifyou mount unsuitable accessories ontotirevalves,the tirevalves may beoverloaded andmalfunction, which can cause tire pressureloss.Tirepressure monitoring systemsforretrofitting will causethe tirevalvetoremainopen. This can alsoresult in tire pressureloss.
Only screwstandardvalve caps orvalvecaps specifically approvedbyMercedes-Benzforyourvehicle ontothe tirevalve.
Tirepressure table
The tire pressuretable is onthe inside ofthefuelfillerflap.
The data shown inthe images isexampledata.
Wheels and tires393

Screwthevalve cap ontothevalve.
Furtherrelated subjects:
RNotes on tire pressure (page 392)
RTirepressuretable (page 393)
RTireand Loading Information placard(page 399)
Tirepressure monitoring system
Function ofthe tire pressure monitoring sys‐tem
\nDANGERRisk of accident duetoincor‐rect tire pressure
Every tire, includingthe spare (if provided),should bechecked when cold at least once amonth and inflatedtothe pressurerecom‐mendedbythevehicle manufacturer (seeTireand Loading Information placard ontheB-pillar onthe driver’sside orthe tire pres‐sure label onthe inside ofthe fuelfillerflapofyourvehicle). Ifyourvehicle has tires of adifferent sizethanthe size indicated onthe
Tireand Loading Information placard orthetire pressuretable,you needtodeterminethe proper tire pressureforthose tires.
As an added safetyfeature,yourvehicle hasbeen equipped with a tire pressure monitor‐ing system (TPMS)that illuminates a low tirepressure indicator lamp when one or more ofyour tires are significantly underinflated.Accordingly, ifthe low tire pressure indicatorlamp lights up,you shouldstop andcheckyour tires as soon as possible, and inflatethemtothe proper pressure. Driving on asignificantly underinflated tire causesthe tireto overheat and can leadtotirefailure.Underinflation also increases fuel consump‐tion andreduces tire tread life, and mayaffectthevehicle's handling and braking abil‐ity. Please notethatthe TPMS is not a substi‐tutefor proper tire maintenance, and it isthedriver'sresponsibilitytomaintain correct tirepressure,even if underinflation has notreachedthe leveltotrigger illumination ofthe TPMS low tire pressure indicator lamp.
Yourvehicle has also been equipped with aTPMS malfunction indicatortoindicate whenthe system is not operating properly. TheTPMS malfunction indicator is combined withthe low tire pressure indicator lamp. Whenthe system detects a malfunction,the indica‐tor lamp willflashfor approximatelya minuteandthenremain continuously illuminated.This sequence will continue upon subsequentvehiclestart-ups as long asthe malfunctionexists.
Whenthe malfunction indicator is illumina‐ted,the system may not be abletodetect orsignal low tire pressure as intended. TPMSmalfunctions may occurfor avariety ofrea‐sons, includingthe installation of incompati‐blereplacement or alternate tires or wheelsonthevehiclethat preventthe TPMS fromfunctioning properly.
Alwayscheckthe TPMS malfunctionwarninglamp afterreplacing one or more tires orwheels onyourvehicletoensurethatthereplacement or alternate tires and wheels
Wheels and tires395

1Preceding letter
2Nominal tire width in millimeters
3Aspectratio in %
4Tirecode
5Rim diameter
6Load-bearing index
7Speedrating
8Load index
The data shown inthe image isexampledata.
Information aboutreading tire data can beobtained from anyqualified specialistworkshop.
Preceding letter11:RWithout: passengervehicle tires accordingtoEuropean manufacturingstandards.
R"P": passengervehicle tires accordingtoUSmanufacturingstandards.
R"LT": light truck tires accordingtoUS manu‐facturingstandards.
R"T": compact emergency sparewheels withhigh tire pressurethat are only designedfortemporary use in an emergency.
Aspectratio33:Ratio between tire height and tire width in per‐cent (tireheight dividedbytire width).
Tire code44(tiretype):R"R"radial tire
R"D": bias ply tire
R"B": bias belted tires
R"ZR":radial tire with a maximum speed above149mph (240 km/h) (optional)
Rim diameter55:The diameter ofthe bead seat (notthe diameteroftherimflange). Therim diameter is specifiedin inches (in).
Load-bearing index66:Numerical codethat specifiesthe maximumload-bearing capacity of a tire (e.g. "91" corre‐spondsto1356 lbs (615kg)).
The load-bearing capacity ofthe tire must be atleast halfthe permissible axle load ofyourvehi‐cle. Do notoverloadthe tiresbyexceedingthespecified load limit.
See also:
RMaximum permissible load ontheTireandLoading Information placard(page 399)
RMaximum tire load (page 405)
RLoad index
Speedrating77:Specifiesthe approved maximum speed ofthetire.
Wheels and tires407

An electronic speed limiter preventsyourvehicle fromexceeding a speed of130mph(210km/h).
Makesurethatyour tires havetherequiredspeedrating.You can obtain information ontherequired speedrating from an authorizedMercedes-Benz Center.
Summer tires
IndexSpeedrating
Qupto100mph (160 km/h)
Rupto106mph (170 km/h)
Supto112mph (180 km/h)
Tupto118mph (190 km/h)
Hupto130mph (210km/h)
Vupto149mph (240 km/h)
Wupto168mph (270 km/h)
IndexSpeedrating
Yupto186mph (300 km/h)
ZR...Y1upto186mph (300 km/h)
ZR...(..Y)1over186mph (300 km/h)
ZR1over149mph (240 km/h)
RSpecifyingthe speedrating asthe "ZR" indexin tire code4is optionalfor tires upto186mph (300 km/h).
RIfyour tire code4includes "ZR" andthereis no speedrating7,find out whatthe max‐imum speed is fromthe tire manufacturer.
RIf load-bearing index6and speedrating7are in brackets,the maximum speedrating ofyour tire is above186mph (300 km/h).Tofind outthe maximum speed, askthe tiremanufacturer.
All-weather tires and winter tires
IndexSpeedrating
Q M+S2upto100mph (160 km/h)
T M+S2upto118mph (190 km/h)
H M+S2upto130mph (210km/h)
V M+S2upto149mph (240 km/h)
Winter tires beartheMsnowflake symboland fulfilltherequirements oftheRubber Manu‐facturers Association (RMA) andtheRubberAssociation of Canada (RAC)regardingthe tiretraction on snow.
Load index88:RNo specification given:standard load (SL)tire
R"XL" or "Extra Load":extra load tire orrein‐forced tire
R"Light Load": light load tire
1"ZR"stated inthe tire code.2Or "M+SM"for winter tires
408Wheels and tires

fied onthevehicle identification plate ontheB‑pillar onthe driver's side.
Maximumweight ofthe ladenvehicle:themaximumweight isthe sum ofthe curbweightofthevehicle,theweight ofthe accessories,themaximum load andtheweight of optional equip‐ment installed atthefactory.
Kilopascal (kPa):metric unitfor tire pressure.6.9 kPa correspondsto1 psi. Another unitfortire pressureis bar.100 kilopascal (kPa) equals1 bar.
Load index:in additiontothe load-bearingindex,the load index may also be imprinted onthe sidewall ofthe tire. This specifiesthe load-bearing capacity ofthe tire more precisely.
Curbweight:theweight of avehicle withstand‐ard equipment includingthe maximum capacityof fuel, oil and coolant. It also includesthe airconditioning system and optional equipment ifthese are installed onthevehicle, but does notinclude passengers or luggage.
Maximum tire load:the maximum tire load isthe maximum permissibleweight in kilograms orlbsfor whicha tire is approved.
Maximum permissible tire pressure:maxi‐mum permissible tire pressurefor one tire.
Maximum load on one tire:maximum load onone tire. This is calculatedbydividingthe maxi‐mum axle load of one axlebytwo.
PSI (pounds per square inch):standard unit ofmeasurementfor tire pressure.
Aspectratio:ratio between tire height and tirewidth in percent.
Tirepressure:pressure insidethe tire applyingan outwardforcetoeverysquare inch ofthe tire.The tire pressure is specified in pounds persquare inch (psi), in kilopascals (kPa) or in bar.The tire pressure should only be corrected whenthe tires are cold.
Cold tire pressure:the tires are cold whenthevehicle has been parkedfor at least3 hourswithout direct sunlight onthe tires orthevehiclehas been drivenfor lessthan 1 mile (1.6 km).
Tirecontact surface:the part ofthe tirethatcomes into contact with theroad.
Tirebead:the purpose ofthe tire bead istoensurethatthe tire sits securely onthe wheel
rim. There are several wire cores inthe tire beadtopreventthe tire fromchanging length onthewheelrim.
Sidewall:the part ofthe tire betweenthe treadandthe tire bead.
Weight of optional equipment:the combinedweight ofthe optional equipmentweighing morethanthereplacedstandard parts and morethan5 lbs (2.3kg).This optional equipment, such ashigh-performance brakes, level control system, aroof luggagerackor high-performance batteries,is not included inthe curbweight andtheweightofthe accessories.
TIN (Tire IdentificationNumber):a uniqueidentification number which can be usedby atire manufacturertoidentify tires,forexample,in a productrecall, andthus identifythe pur‐chasers. The TIN is made up ofthe manufactur‐er's identity code, tire size, tire type code andthe manufacturing date.
Load-bearing index:the load-bearing index is acodethat containsthe maximum load-bearingcapacity of a tire.
41 0Wheels and tires

\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

Display messagesPossible causes/consequences andPPSolutions
Observethe notes onthe diagnostics connection (page 25).
Visit aqualified specialistworkshop.
S
Inoperative
*At least one main function ofthe Mercedes me connect system or ofthe SOS emergency call system is malfunc‐tioning.
Visit aqualified specialistworkshop.
u
Front Left MalfunctionService Required(Example)
*The correspondingrestraint system isfaulty (page 34).
\nWARNINGRisk of injuryorfatal injury duetoa malfunction intherestraint system
Iftherestraint system is malfunctioning,restraint system components may be triggered unintentionally ormight not be triggered at all intheevent of an accident. This may affectthe EmergencyTensioning Device orairbag,forexample.
Havetherestraint systemchecked andrepaired immediately at aqualified specialistworkshop.
Detection of arestraint system malfunction:
RTheurestraint systemwarning lamp does not light up whenthe ignition is switched on.
RTheurestraint systemwarning lamp lights up continuously orrepeatedly during a journey.
Visit aqualified specialistworkshop immediately.
446Displaymessages andwarning/indicator lamps

Display messagesPossible causes/consequences andPPSolutions
Active Brake Assist Func-tions Currently Limited SeeOperator's Manual
*Vehicles withthe Driving AssistancePackage:Active Brake Assistwith cross-traffic function, EvasiveSteering
Assist or PRE‑SAFE®PLUS aretemporarily unavailable or only partiallyavailable.
Vehicles withoutthe Driving Assistance package:Active Brake Assististemporarily unavailable.
The ambient conditions are outsidethe system limits (page175).
Drive on.As soon asthe ambient conditions are withinthe system limits,the system will becomeavailable again.
Ifthe display message does not disappear,stopthevehicle while paying attentiontoroad and traffic conditionsandrestartthe engine.
u
SRS Malfunction ServiceRequired
*Therestraint system isfaulty (page 34).
\nWARNINGRisk of injuryorfatal injury duetoa malfunction intherestraint system
Iftherestraint system is malfunctioning,restraint system components may be triggered unintentionally ormight not be triggered at all intheevent of an accident. This may affectthe EmergencyTensioning Device orairbag,forexample.
Havetherestraint systemchecked andrepaired immediately at aqualified specialistworkshop.
Detection of arestraint system malfunction:
RTheurestraint systemwarning lamp does not light up whenthe ignition is switched on.
RTheurestraint systemwarning lamp lights up continuously orrepeatedly during a journey.Visit aqualified specialistworkshop immediately.
Displaymessages andwarning/indicator lamps447

Lights
Display messagesPossible causes/consequences andPPSolutions
I
Intell. Light System Inoper-ative
*The Intelligent Light System is defective. The lighting system continuestofunction properly withoutthe functions ofthe Intelligent Light System.
Visit aqualified specialistworkshop.
I
Check Left LowBeam(Example)
*The corresponding light source is defective.
Drive on carefully.
Visit aqualified specialistworkshop immediately.
or
Check whetheryou are permittedtoreplacethe light sourceyourself (page129).
LED light bulbs:the display messageforthe corresponding lamp appearsonly when allthe light-emitting diodesinthe lamp havefailed.
I
Active Headlamps Inopera-tive
*The active headlamps are defective.
Visit aqualified specialistworkshop.
476Displaymessages andwarning/indicator lamps

Display messagesPossible causes/consequences andPPSolutions
I
Switch Off Lights
*You are leavingthevehicle andthe lights arestill switched on.
Turnthe light switchtotheXposition.
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 switchtotheXorXposition.
I
Automatic Headlamp ModeInoperative
*The light sensor isfaulty.
Consult aqualified specialistworkshop.
*Adaptive Highbeam Assist is malfunctioning.
Display messages andwarning/indicator lamps477