ECU MERCEDES-BENZ C CLASS 2019 Repair Manual

The tire pressuretable shows therecommendedtire pressurefor all tires approvedforthisvehi‐cle. Therecommended tire pressures applyforcold tires undervarious operating conditions, i.e.loading and/or speed ofthevehicle.
If one or more tire sizes precede a tire pressure,the tire pressure informationfollowing is onlyvalidforthose tire sizes.
The load conditions "partially laden" and "fullyladen" are defined inthetablefor different num‐bersof passengers and amounts of luggage. Theactual number of seats may differ fromthis.
Some tire pressuretables only showtherimdiameter instead ofthe completetire size, e.g.R18. Therim diameter is part ofthe tire size andcan befound onthe tire sidewall(page 406).
Be suretoalso observethefollowing furtherrelated subjects:
RNotes on tire pressure (page 392)
RTireand Loading Information placard(page 399)
RMaximum tire pressure (page 406)
Checking tire pressures manually
Readthe tire pressureforthe current operat‐ing conditions fromtheTireand LoadingInformation placard orthe tire pressuretable. Observethe notes on tire pressure.
Removethevalve cap ofthe tiretobechecked.
Pressthe tire pressuregauge securely ontothevalve.
Readthe tire pressure.
Ifthe tire pressure is lowerthantherecom‐mendedvalue, increasethe tire pressuretotherecommendedvalue.
Ifthe tire pressure is higherthantherecom‐mendedvalue,release air.Todo so, pressdownthe metal pin inthevalve, e.g. usingthe tip of a penforexample. Thencheckthetire pressureagain usingthe tire pressuregauge.
394Wheels and tires

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)
Rviathewwarning 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:
ServiceTires
One ofthefollowing displaysappears:
RCurrent tire pressure and tiretemperature ofthe individual wheels:
RTire pressure will be displayed after driving afew minutes
396Wheels 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

Height when opened
Model11Heightwhenopened
C 30069.6 in(1768 mm)
C 300 4MATIC69.8 in(1774 mm)
Vehicle dimensions
All models
Vehicle length184.5 in(4686 mm)
Vehicle width including out‐side mirrors79.5 in(2020 mm)
Wheelbase111.8 in(2840 mm)
ModelVehicleheight
C 30057.0 in(1447 mm)
C 300 4MATIC61.1in(1552 mm)
ModelTurningradius
C 30036.8ft(11.22 m)
C 300 4MATIC37.6ft(11.45 m)
Weights and loads
Please notethatforthe specifiedvehicle data:
Ritems of optional equipment increasethecurbweight andreducethe payload.
Roof load
All models
Maximumroof load165 lb (75kg)
432Technical data

Display messagesPossible causes/consequences andPPSolutions
Reven whenthe front passenger seat is not occupied
The system may detect objects orforcesthat are addingtotheweight appliedtothe seat.
\nWARNINGRisk of injuryorfatal injury when using achildrestraint system whilethe front passenger air bagis enabled
Ifyou secure achild in achildrestraint system onthe front passenger seat andthe front passenger air bag isenabled,the front passenger air bag can deploy intheevent of an accident.
Thechild could bestruckbythe air bag.
Ensure, bothbefore and duringthe journey,thatthestatus ofthe front passenger air bag is correct.
NEVER use arearwardfacingchildrestraint on a seat protectedbyanACTIVE FRONT AIRBAG; DEATH or SERI‐OUS INJURYtotheCHILD can occur.
Pullover andstopthevehicle safely as soon as possible, paying attentiontoroad and traffic conditions.
Checkthestatus ofthe automatic front passenger airbag shutoff (page44).
If necessary,consult aqualified specialistworkshop immediately.
Front Passenger Airbag Dis-abled See Operator's Man-ual
*The front passenger airbag andthe knee airbag are deactivated, although an adult or a person with an adultstatureis onthe front passenger seat. If additionalforces are appliedtothe seat,theweightthe system detects may betoo low.
444Displaymessages andwarning/indicator lamps

Securing onthe front passenger seat ....60Securing ontherear seat ...................... 58TopTether ..............................................56
ChildrenAvoiding dangers inthevehicle .............49Basic instructions .................................. 48Special seat beltretractor .....................54
Chock........................................................414Storage location ...................................414
Chocksee Chock
CigarettelighterFront center console ............................117
Cleaningsee Care
Climate control........................................13 83-zone automatic climatecontrolpanel ...................................................13 8Activating/deactivating .......................139Activating/deactivatingthe A/Cfunction (control panel) .......................139Activating/deactivatingthe A/Cfunction (multimedia system) ..............13 9
Activating/deactivatingthe synchro‐nization function (control panel) ..........14 0Activating/deactivatingthe synchro‐nization function (multimedia sys‐tem) .....................................................141Air distribution settings .......................140Air-recirculation mode .........................141Automatic control ................................14 0Climatestyle function ..........................14 0Control panelfor dual-zone auto‐matic climatecontrol ...........................13 8Defrostingthe windshield ....................13 8Filling capacityforPAG oil ...................431Front airvents .....................................14 3Inserting/removingtheflacon (fra‐grance system) ....................................14 2Ionization .............................................141Note....................................................13 8Rear airvents ......................................14 3Rear operating unit ..............................13 8Refrigerant .......................................... 430Refrigerantfilling capacity ...................431Removing condensation fromthewindows...............................................141Residual heat .......................................141
Settingrear climate control (multi‐media system) .....................................140Settingthe air distribution ...................138Settingthe airflow...............................13 8Settingthe climatestyle ......................140Settingthe fragrance system ...............141Settingthetemperature ......................138Switchingtherear windowdefrosteron/off .................................................138Ventilatingthevehicle (convenienceopening) ................................................81
ClimatestyleFunction ..............................................14 0Setting .................................................14 0
Cockpit.........................................................6Overview .................................................6
Coffee cup symbolseeATTENTION ASSIST
COMANDsee Multimedia system
COMANDTouchManaging devices ................................ 268
Combination switch................................124
Index499

Language.................................................269Notes .................................................. 269Setting .................................................269
LATCH-type (ISOFIX)child seat secur‐ing systemInstalling ................................................54
Level control systemsee AIRMATIC
Light switchOverview .............................................122
Lightingsee Interior lightingsee Lights
Lights........................................................12 2Adaptive Highbeam Assist ...................125Adjustingthe instrument lighting ......... 231Automatic driving lights .......................12 3Changing bulbs ....................................12 8Combination switch.............................124Cornering light function .......................12 5Hazardwarning lights ..........................12 5Headlamprange ..................................12 3High beam ...........................................124High-beamflasher ...............................124
Light switch .........................................122Low-beam headlamps ..........................12 2Parking lights .......................................122Rearfog lamp ......................................12 2Responsibilityfor lighting systems .......122Settingtheexterior lighting switch-off delay time .......................................127Settingthe surround lighting ...............127Standing lights .....................................122Turnsignals .........................................124
LimitedWarrantyVehicle ...................................................27
LiveTraffic InformationDisplaying subscription information .... 294Displayingthe traffic map ...................294Displaying traffic incidents .................. 295Extending a subscription ..................... 294Issuing hazard alerts ........................... 295
Load index (tires).................................... 406
Load-bearing capacity (tires)................. 406
Loading.....................................................109Bag hook .............................................109Cargo tie-downrings ...........................109Definitions ...........................................409
Notes ...................................................104Roof carrier ..........................................11 3Stowage space underthe trunkfloor ...11 3
Loading guidelines..................................104
Loading information table...................... 399
LoadsSecuring ..............................................104
Locator lightingsee Surround lighting
Locking/unlockingActivating/deactivatingthe auto‐matic lockingfeature .............................71Emergencykey ......................................72KEYLESS-GO .......................................... 70Unlocking and opening doors fromthe inside ..............................................69
Low-beam headlampsReplacing bulbs ...................................130Switching on/off .................................12 2
Lubricant additivesseeAdditives
LuggageLuggage net .........................................109
Index511

Securing ..............................................104
Lumbar supportseeLumbar support (4-way)
Lumbar support (4-way)...........................95
M
MaintenanceMenu (on-boardcomputer) .................. 231Vehicle .................................................. 23
Maintenancesee ASSYST PLUS
MalfunctionRestraint system ................................... 34
Malfunction messagesee Display message
Map...........................................294, 296, 297Avoiding an area ..................................299Avoiding an area (overview) .................299Changing an area ................................ 299Deleting an area .................................. 300Displayingthe compass ....................... 301Displayingthe mapversion .................298
Displayingthe next intersectingstreet................................................... 298Displayingthe satellite map ................. 301Displayingthe traffic map ...................294Displayingweather information ...........301Map data ............................................. 300Moving .................................................297Overview ............................................. 296Selecting POI symbols .........................298Selectingtext information ................... 298Selectingthe map orientation .............297Settingthe map scale .......................... 297Settingthe map scale automatically ....301Updating .............................................300
Map and compassOverview ............................................. 296
Massage programOverview ............................................... 98Resettingthe settings ............................98
Massage programsSelectingthe front seats ....................... 98
Massage settingsResetting ............................................... 98
Mattefinish (cleaning instructions).......361
Maximum loadrating.............................. 405
Maximum permissible loadCalculationexample ............................ 401Determining ........................................ 400
Maximum tire pressure.......................... 406
MechanicalkeyInserting/removing ............................... 66
MediaMenu (on-board computer) .................. 235Searching ............................................ 336
Media displayNotes ................................................... 254
Media InterfaceActivating ............................................ 337Information .......................................... 336Overview .............................................338
Media modeActivating ............................................ 331
Media playbackOperating (on-board computer) ........... 235
Media searchStarting ...............................................336
512Index

Technical dataInformation .......................................... 421Tirepressure monitor .......................... 397Vehicle identification plate .................. 423
Telephone........................................ 236, 303Activating functions during a call ........ 308Call andringtonevolume .....................308Calls with several participants .............308Connecting a mobile phone (NearField Communication (NFC)) ...............307Connecting a mobile phone (Pass‐key) .....................................................304Connecting a mobile phone (SecureSimplePairing) .................................... 304De-authorizing a mobile phone ............ 306Disconnecting a mobile phone ............ 306Importing contacts ...............................311Importing contacts (overview) .............310Incoming call during anexisting call .... 309Information .......................................... 304Interchanging mobile phones .............. 306Menu (on-board computer) .................. 236Mobile phonevoicerecognition .......... 308Notes .................................................. 302Operating modes ................................. 304
Reception and transmissionvolume .... 307Switching mobile phones (Near FieldCommunication (NFC)) ........................ 307Telephone menuoverview ...................303Telephone operation ............................ 308Using Near Field Communication(NFC) ...................................................307Voice commands (Voice Control Sys‐tem) .....................................................24 6Wirelesscharging (mobile phone) ........12 0
Telephonesee Secondtelephone
Telephone numberDialing (on-board computer) ................ 236
Telephony operating modes
Bluetooth®Telephony .......................... 304
Telephony operating modessee Secondtelephone
Temperature............................................13 8
Temperaturegrade.................................. 403
Text messages.........................................312Calling a message sender ....................313Changingfolders ..................................314
Composing ...........................................313Configuringthe displayedtext mes‐sages ...................................................312Deleting ...............................................314Drafts ..................................................314Notes ...................................................312Options ................................................314Outbox .................................................314Read-aloud function .............................313Reading ................................................313Replying ...............................................313Sending ................................................313Voice commands (Voice Control Sys‐tem) ..................................................... 250
Through-loadingfeaturesee Seat
TimeManual time setting ............................. 265Setting summer time ........................... 264Settingthe time and date automati‐cally ..................................................... 264Settingthe time zone .......................... 264Settingthe time/dateformat .............. 265
TIN (Tire IdentificationNumber)............404
Index523