2019 MERCEDES-BENZ C CLASS battery

Climate control........................................13 8Overview of climate control systems ..........138Operatingthe climate control system .........13 9
Driving and parking.................................14 4Driving ........................................................14 4DYNAMIC SELECT switch ...........................15 3Automatic transmission ..............................154Function ofthe 4MATIC ..............................15 9Refueling ....................................................15 9Parking ........................................................161Driving and driving safety systems .............170Vehicletowing instructions .........................225
Instrument Display and on-boardcomputer..................................................226Instrument Displayoverview ...................... 226Overview ofthe buttons onthesteeringwheel ..........................................................227Operatingthe on-board computer .............. 228Settingthe design ...................................... 229Settingthe additionalvaluerange .............. 229Overview of displays onthe multifunc‐tion display .................................................230
Adjustingthe instrument lighting ................231Menus and submenus ................................. 231Head-up Display ......................................... 237
Voice Control System..............................239Notes on operating safety .......................... 239Operation ................................................... 239UsingtheVoice Control System effec‐tively ...........................................................241Essentialvoice commands ..........................241
Multimedia system..................................254Overview and operation .............................. 254System settings .......................................... 263Fit & Healthy...............................................274Navigation ...................................................276Telephone ...................................................302Online and Internet functions ..................... 324Media .........................................................329Radio .......................................................... 342Sound .........................................................349
Maintenance and care.............................351ASSYST PLUS service interval display .........351Engine compartment .................................. 352Cleaning and care ....................................... 359
Breakdown assistance............................368Emergency ..................................................368Flat tire .......................................................370Battery (vehicle) ..........................................376Towstarting ortowingaway....................... 381Electrical fuses ........................................... 386
Wheels and tires......................................390Notes on noise or unusual handlingchar‐acteristics ...................................................390Notes onregularlyinspecting wheels andtires ............................................................ 390Notes on snowchains .................................391Tirepressure .............................................. 392Loadingthevehicle .................................... 399Tirelabeling ................................................ 403Definition oftermsfor tires and loading ..... 409Changing a wheel ........................................411
Contents3

\nWARNINGRisk of accident duetoobjects inthe driver'sfootwell
Objects inthe driver'sfootwell may impedepedal travel or block a depressed pedal.
This jeopardizesthe operating androadsafety ofthevehicle.
Stowall objects inthevehicle securelysothattheycannotgetintothe driver'sfootwell.
Always installthefloor mats securelyand as prescribed in ordertoensurethatthere is always sufficientroomforthe pedals.
Do not use loosefloor mats and do notplacefloor mats ontop of one another.
NOTEBattery discharging from usingdevices connectedtothe diagnosticsconnection
Using devices atthe diagnostics connectiondrainsthe battery.
Checkthechargelevel ofthe battery.
Ifthechargelevel is low,chargethebattery,e.g.bydriving a considerabledistance.
Connecting equipmenttothe diagnostics con‐nection can leadtoemissions monitoring infor‐mation beingreset,forexample. This may leadtothevehiclefailingtomeettherequirements ofthe next emissions inspection duringthe maininspection.
Qualified specialistworkshop
An authorized Mercedes-Benz Center is aquali‐fied specialistworkshop. It hasthe necessaryspecial skills,tools andqualificationstocor‐rectly carryouttheworkrequired onyourvehi‐cle. This particularlyappliestosafety-relevantworks.
Forthefollowing, always haveyourvehiclechecked at an authorized Mercedes-Benz Cen‐ter:
Rsafety-relevantworks
Rservice and maintenancework
Rrepairwork
Rmodifications aswell as installations andconversions
Rworkon electronic components
Mercedes‑Benzrecommends a Mercedes‑Benzservice center.
Correct use ofthevehicle
Ifyouremoveanywarningstickers,you orotherscouldfailtorecognize certain dangers. Leavewarningstickersin position.
Observethefollowing information in particularwhen drivingyourvehicle:
Rthe safety notes inthis manual
Rtechnical dataforthevehicle
Rtrafficrules andregulations
Rlawsand safetystandards pertainingtomotorvehicles
26General notes

QR codeforrescue card
The QR code is secured inthe fuelfillerflap andonthe opposite side onthe B-pillar. Intheeventof an accident,rescue services can usethe QRcodetoquicklyfindthe appropriaterescue cardforyourvehicle. The currentrescue card con‐tainsthe most important information aboutyourvehicle in a compactform, e.g.therouting oftheelectric lines.
Further information can be obtained at http://www.mercedes-benz.de/qr-code.
Datastorage
Electronic control units
Electronic control units are installed inyourvehi‐cle. Some ofthese are necessaryforthe safeoperation ofyourvehicle, while some assistyouwhen driving (driver assistance systems). Inaddition,yourvehicle provides comfortandentertainment functions, which are also madepossiblebyelectronic control units.
Electronic control units contain datamemorieswhichcantemporarily or permanentlystore
technical information aboutthevehicle's operat‐ingstate, component loads, maintenancerequirements andtechnicalevents or malfunc‐tions.
Ingeneral,this information documentsthestateof a component part, a module, a system orthesurroundings such as:
Roperatingstatus of system components (e.g.fill levels, batterystatus, tire pressure)
Rstatus messages concerningthevehicle orits individual components (e.g. number ofwheelrevolutions/speed, longitudinal accel‐eration, lateral acceleration, display offas‐tened seat belts)
Rmalfunctions orfaults in important systemcomponents (e.g. lights, brakes)
Rinformation onevents leadingtovehicledamage
Rsystemreactions in special driving situations(e.g. airbag deployment, intervention ofsta‐bility control systems)
Rambient conditions (e.g.temperature,rainsensor)
In additiontoprovidingthe actual control unitfunction,this data assiststhe manufacturer indetecting andrectifying malfunctions and opti‐mizingvehicle functions. The majority ofthisdata istemporary and is only processed inthevehicle itself. Only a small portion ofthe data isstored intheevent or malfunction memory.
Whenyourvehicle is serviced,technical datafromthevehicle can beread outbyservice net‐workemployees (e.g.workshops, manufactur‐ers) orthird parties (e.g. breakdown services).Services includerepair services, maintenanceprocesses,warranty claims andquality assur‐ance measures,forexample. Theread out is per‐formed viathe legally prescribed portforthediagnostics connection inthevehicle. Therespective service network locations orthirdparties collect, process and usethe data. Theydocumenttechnicalstatuses ofthevehicle,assist infinding malfunctions and improvingquality and are transmittedtothe manufacturer,if necessary.Furthermore,the manufacturer issubjecttoproduct liability.Forthis,the manu‐facturerrequirestechnical datafromvehicles.
28General notes

SmartKey
Overview of SmartKeyfunctions
\nWARNINGRisk of accident and injuryduetochildren left unattended inthevehicle
Ifchildren are left unattended inthevehicle,theycould:
ROpen doors,thereby endangeringotherpersons orroad users.
RGet out ofthevehicle and be hitbyoncoming traffic.
ROperate vehicle equipment and becometrapped,forexample.
In addition,children could also setthevehi‐cle in motion,forexample,by:
RReleasingthe parking brake.
RShiftingthe automatic transmission outof park position]or shifting manualtransmission into neutral.
RStartingthe engine
When leavingthevehicle, alwaystakethe SmartKeywithyou and lockthevehicle.
Never leavechildren and animals unat‐tended inthevehicle.
Keepthe SmartKeyout ofreach ofchil‐dren.
NOTEDamagetothekey causedbymagneticfields
Keepthekeyawayfromstrong mag‐neticfields.
1Locks
2Batterycheck lamp
3Unlocks
4Opens/closesthe trunk lid
5Panic alarm
The SmartKey mayvaryfromthe one showninthe diagram, depending onthevehicleequipment.
The SmartKeylocksand unlocksthefollowingcomponents:
Rthe doors
Rthe trunk lid
Rthe fuelfillerflap
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Ifthevehicle is not opened within approximately40 seconds after unlocking, it locksagain. Anti-theft protection is activated again.
Do notkeepthe SmartKeytogether with elec‐tronic devices or metal objects. This can affectthe SmartKey's functionality.
If batterycheck lamp2does not light upafter pressingthe6or7button,thebattery is discharged.
Replacingthe SmartKeybattery(page 66).
Activating/deactivating the acoustic lockingverification signal
Multimedia system:
VehicleîVehicle SettingsAcoustic Lock
Activatesor deactivateSthe function.
Activating/deactivating the panic alarm
Requirements:RThe ignition is switched off
The panic alarm function is onlyavailable incertain countries.
Toactivate:press button1for approx‐imatelyone second.A visual and audible alarm is triggered.Todeactivate:briefly press button1again.
or
Pressthestart/stop button onthe cockpit(the SmartKeyis insidethevehicle).
Changingthe unlocking settings
Possible unlocking functions ofthe SmartKey:
RCentral unlocking
RUnlockingthe driver's door and fuelfillerflap
Toswitch between settings:pressthe6and7buttons simultaneouslyforapproximately six seconds untilthe batterycheck lampflashes twice.
Ifthe unlocking functionforthe driver's doorand fuelfillerflap has been selected:
RPressingthe6button a second time cen‐trally unlocksthevehicle
RVehicles with KEYLESS-GO:Ifyoutouchthe inner surface ofthe door handle onthedriver's door, onlythe driver's door and fuelfillerflap are unlocked.
Deactivatingthe SmartKeyfunctions
Ifyou do not usethevehicle or a SmartKey foranextended period of time,you canreducetheenergy consumption oftherespective Smart‐Key .Todo so, deactivatethe SmartKeyfunc‐tions.
Opening and closing65

Todeactivate:pressthe7button ontheSmartKeytwice inquick succession.The batterycheck lamp ofthe SmartKeyflashes twice brieflyand lights up once.
Toactivate:press any button onthe Smart‐Key.
Whenthevehicle isstarted withthe Smart‐Key inthestowage compartment ofthe cen‐ter console,the SmartKeyfunctions areautomaticallyactivated (page145).
Removing/inserting the emergencykey
Toremove:pressrelease button1.Emergencykey2is pushed out slightly.
Pull out emergencykey2until it engages inthe intermediate position.
You can usethe intermediate position ofemergencykey2toattachthe SmartKeytoakeyring.
Pressrelease button1again and fullyremoveemergencykey2.
Toinsert:pressrelease button1.
Insert emergencykey2tothe intermediateposition or fully until it engages.
Replacing the SmartKeybattery
\nDANGERSerious damagetohealthcausedbyswallowing batteries
Batteries containtoxic and corrosive sub‐stances. Swallowing batteries may causeserious damagetohealth.
There is arisk offatal injury.
Keep batteries out ofthereach ofchil‐dren.
If batteries are swallowed, seek medicalattention immediately.
ENVIRONMENTALNOTEEnvironmentaldamagecausedbyimproper disposal ofbatteries
Batteries contain pollutants. It isillegaltodispose ofthem withthe householdrubbish.

Dispose of batteries in anenvironmentallyresponsible manner.Takedischarged batteriestoaqualifiedspecialistworkshop ortoa collectionpointfor used batteries.
66Opening and closing

Requirements:RYourequire a CR 2032 3 V cell battery.
Mercedes-Benzrecommendsthatyou havethebatteryreplaced at aqualified specialistwork‐shop.
Removethe emergencykey (page 66).
Pressrelease button2down fully and slidecover1inthe direction ofthe arrow.
Fold out cover1inthe direction ofthearrowandremove.
Removebattery compartment3andtakeoutthe discharged battery.
Insertthe new battery into battery compart‐ment3. Observethe positive pole markinginthe battery compartment and onthe bat‐terywhen doingthis.
Push in battery compartment3.
Re-attach cover1and push it until itengages.
Problems withthe SmartKey
ProblemPossible causes/consequences andPPSolutions
You can no longer lock or unlockthevehicle.Possible causes are:
RThe SmartKeybattery is discharged or nearly discharged.
RThere is interference from a powerfulradio signal source.
Opening and closing67

ProblemPossible causes/consequences andPPSolutions
RThe SmartKeyis defective.
Checkthe battery usingthe batterycheck lamp andreplace if necessary (page 66).
Usethe emergencykeytolock or unlock (page 66).
Havethe SmartKeychecked at aqualified specialistworkshop.
You havelost a SmartKey.Havethe SmartKeydeactivated at aqualified specialistworkshop.
If necessary,havethe mechanical lockchanged aswell.
68Opening and closing