engine MERCEDES-BENZ C CLASS 2019 Service Manual

NOTEDamagefrom automatic braking
If one ofthefollowing functions is switchedon,thevehicle brakes automatically in cer‐tain situations:
RActive Brake Assist
RActive Distance AssistDISTRONIC
RHOLD function
RActiveParking Assist
Toavoid damagetothevehicle, deactivatethese systems inthefollowing or similar sit‐uations:
Duringtowing
In a carwash
Requirements:RThevehicle isstationary.
RThe driver's door is closed orthe seat belt onthe driver's side isfastened.
RThe engine isrunning or has been automati‐cally switched offbythe ECOstart/stopfunction.
RThe electric parking brake isreleased.
RActive Distance AssistDISTRONIC is deacti‐vated.
RThe transmission is in position[,^or\\.
Activating the HOLD function
Depressthe brake pedal and after a shorttimequickly depress further untilthe

Vehicles without 360° Camera
1Parking AssistPARKTRONIC is only opera‐tional inthe front andrear
2Parking AssistPARKTRONIC is operationaland can alsowarnthe driver about obstaclesatthe side ofthevehicle
3Obstacle detected atthe frontright (yellow)andrear (red)
Vehicles with 360° Camera
1Parking AssistPARKTRONIC is only opera‐tional inthe front andrear
2Parking AssistPARKTRONIC is operationaland can alsowarnthe driver about obstaclesatthe side ofthevehicle
3Obstacle detected atthe frontright (red)
Saved obstacles onthe sides are deleted inthefollowing situations,forexample:
RYou parkthevehicle and switch offthe igni‐tion.
RYou openthe doors.
Afterthe engine isrestarted, obstacles must bedetected again before a newwarning can beissued.
System limitationsThe system limitationsforParking AssistPARKTRONIC applyfor passive side impact pro‐tection.
Thefollowing objects are not detected,forexam‐ple:
RPedestrians who approachthevehicle fromthe side
RObjects placed nexttothevehicle
Deactivating/activatingParking AssistPARKTRONIC
NOTERisk of an accident from objectsat closerange
Parking AssistPARKTRONIC may not detectcertain objects at closerange.
When parking or maneuveringthevehi‐cle, pay particular attentiontoanyobjects which are aboveor belowthesensors, e.g.flower pots or drawbars.
202Driving and parking

RIfthe time has been set incorrectly.
RIn activedriving situations, ifyouchangelanes andvaryyour speed frequently.
TheATTENTION ASSIST tiredness or alertnessassessment is deleted andrestarted when con‐tinuingthe journey inthefollowing situations:
RIfyou switchoffthe engine.
RIfyou unfastenyour seat belt and openthedriver's door (e.g.changing drivers ortakinga break).
SettingATTENTION ASSISTMultimedia system:
VehiclekAssistanceATTENTION ASSIST
Setting options
SelectStandard,SensitiveorOff.
Suggesting arestarea
SelectSuggest Rest Area.
Activatesor deactivatethe functionS.IfATTENTION ASSIST detectsfatigue orincreasing lackof attention, it suggests arestarea inthe vicinity.
Select a suggestedrestarea:you are gui‐dedtothe selectedrestarea.
Traffic Sign Assist
Function ofTraffic Sign Assist
Traffic Sign Assistdetects traffic signs withmul‐tifunction camera1. It assistsyoubydisplay‐ing detected speed limits andovertakingrestric‐
tions inthe instrument cluster and optionally inthe Head-up Display.
SinceTraffic Sign Assistalso usesthe datastored inthe navigation system, it can updatethe display inthefollowing situations withoutdetecting traffic signs:
RWhenthevehiclechangesroads, e.g. a free‐way entry orexitroad.
RWhen a village or city boundary which isstored inthe digital map is passed.
The camera also detects traffic signs with arestriction indicatedbyan additional sign (e.g. inwet conditions).
Traffic Sign Assistis only an aid. The driver isresponsibleforkeeping a safe distancetothevehicle in front,forvehicle speed andfor brakingin good time. The maximum permissible speedalso depends onfactors suchastheroad sur‐face and traffic conditions.
Warning whenthe maximum permissiblespeed isexceededThe system canwarnyou ifyou unintentionallyexceedthe maximum permissible speed.Todo
Driving and parking217

The segments on speedometer1indicatethesystemstatusforthefollowing:
RCruise control (page181)
RActive Distance AssistDISTRONIC(page183)
NOTEEngine damageduetoexcessivelyhigh engine speeds
The engine will be damaged ifyou drive withthe engine intheoverrevvingrange.
Do not drive with the engine intheover‐revvingrange.
The fuel supply is interruptedtoprotecttheengine whenthered mark ontachometer3(overrevvingrange) isreached.
During normal operating conditions, coolanttemperature display4mayrisetotheredmark.
\nWARNINGDanger of burns when open‐ingthe hood
Ifyou openthe hood whenthe engine hasoverheated or during afireinthe enginecompartment,you could come into contactwith hotgases orother escaping operatingfluids.
Before openingthe hood, allowtheenginetocool down.
Intheevent of afireinthe engine com‐partment,keepthe hood closed andcallthefireservice.
Overview ofthe buttons onthesteeringwheel
1¤Back/Home button (press and hold),on-board computer
2Touch Control, on-board computer
3Control panelfor cruise control orActiveDistance AssistDISTRONIC
4Control panelfor multimedia system:
£Voice Control System
ßDisplaysfavorites
VOL: control knob, adjuststhevolume orswitchesthe sound offc(press)
aMakes/accepts a call
Instrument Display and on-board computer227

Vehicles withTraffic Sign Assist:Detectedinstructions and traffic signs (page217).
Adjusting the instrument lighting
Turnbrightness control1up or down.The lighting ofthe Instrument Display and inthe control elements ofthevehicle interior isadjusted.
Menus and submenus
Functions onthe service menu ofthe on-board computer
On-board computer:
Service
Toselectthe function:swipe upwards ordownwards onthe left-handTouch Control.
Pressthe left-handTouch Control.
Functions ontheServicemenu:
RMessage memory (page 433)
RTires:
-Restartthe tire pressure losswarningsystem (page 398)
-Checkthe tire pressure withthe tire pres‐sure monitor (page 396)
-Restartthe tire pressure monitor(page 397)
RASSYST PLUS: calls upthe service due date(page 351)
RVehicles with aWidescreen Cockpit:Cool-ant: coolanttemperature display
REngine Oil Level: engine oil level
Calling upthe assistancegraphic
On-board computer:
Assistance
Thefollowing displaysareavailable onthe assis‐tance graphic menu:
RAssistancegraphic
RAttention level (page215)
Toswitch betweenthe displays:swipeupwards or downwards onthe left-handTouch Control.
Instrument Display and on-board computer231

Voice commandFunction
Scent menuTodisplay fragrance settings
Energy flowTodisplay energyflowsettings
Ionization menuTodisplay ionization settings
Climate control menuTodisplay climate control settings
Automatic climate control driver onToswitch onthe automatic climate control settings onthe driver's side
Light menuTodisplay light settings
Massage menuTodisplay massage settings
Massage driver's seat onToswitch onthe massage functionforthe driver's seat
Massage driver's seat offToswitch offthe massage functionforthe driver's seat
Outside temperatureTodisplaythe outsidetemperature
Engine dataTodisplay engine data
Seats menuTodisplay seat adjustment settings
Seat heating front passenger level "2"Tosetthe seat heatingforthe front passenger seattolevel 2
252Voice Control System

the mobile phone connection inyourvehicleand, as an option, installed automatically.Yo ucan monitorthestatus ofyour updates ontheMercedes me portal andfind information aboutpotential innovations.
Your advantages at aglance:
Rconvenientlyreceivesoftware updates viathe mobile phone network
Rimprovesthequality andavailability ofMercedes me connect services
Rkeepsyour multimedia system and communi‐cation module up-to-date
Further information about software updates canbefound at http://me.mercedes-benz.com
Performing a software update
Requirements:RThere is an Internet connection(page 324).
RFor automatic updates:yourvehicle has apermanentlyinstalled communication mod‐ule.
Multimedia system:
SystemSoftware Update
Automatic update
SwitchAutomatic Online Updateons.Updates are performed.
The currentstatus ofthe updates is dis‐played.
Manual update
DeactivateSAutomatic Online Update.
Select an update fromthe list andstarttheupdate.
Activating the softwareupdate
Restartthe system.
Function of important system updatesImportant system updates may be necessaryforthe security ofyour multimedia system's data.Please installthese updates, or elsethe securityofyour multimedia system cannotbe ensured.
If automatic software updates are activated,the system updates will be downloaded auto‐matically (page273).
As soon as an updateisavailablefor download,a corresponding message appearsonthe mediadisplay.
You havethefollowing selection options:
RDownload
The update will be downloaded inthe back‐ground.
RDetails
Information aboutthe pending systemupdate is displayed.
RLater
The update can be downloaded manually at alater time (page273).
Ifthe download is completed andthe update isreadyfor installation,you will be informed ofthisafterthe next ignition cycle,forexample.
Parkthevehicle safely in a suitable locationbeforestartingthe installation.
Requirementsforthe installation:
RThe ignition is switched on.
RThe engine is notrunning.
Multimedia system273

ASSYST PLUS service interval display
Function ofthe ASSYST PLUS service intervaldisplay
The ASSYST PLUS service interval display ontheInstrument Display provides information ontheremaining time or distance beforethe nextservice due date.
You can hidethis service message usingtheback button onthe left-hand side ofthesteeringwheel.
Depending on howthevehicle is used,theASSYST PLUS service interval display mayshortenthe service interval, e.g. inthefollowingcases:
RMainly short-distance driving
RWhenthe engine is often leftidlingfor longperiods
RIntheevent of frequent coldstart phases
Mercedes-Benzrecommendsavoiding suchoperating conditions.
You can obtain further information concerningthe servicing ofyourvehicle from aqualified
specialistworkshop, e.g. an authorizedMercedes-Benz Center.
Displayingthe service due date
On-board computer:
ServiceASSYST PLUS
The next service due date is displayed.
Toexitthe display:pressthe back buttononthe left-hand side ofthesteering wheel.
Make suretoobservethefollowing furtherrela‐ted subject:
ROperatingthe on-board computer(page 228).
Information onregular maintenancework
NOTEPrematurewearthroughfailuretoobserveservice due dates
Serviceworkwhich is not carried out attheright time or incompletelycan leadtoincreasedwear and damagetothevehicle.
Always observethe prescribed serviceintervals.
Always havethe prescribed serviceworkcarried out at aqualified specialistworkshop.
Special servicerequirements
The prescribed service interval is based on nor‐mal operation ofthevehicle. Maintenanceworkwill needtobe performed more often ifthevehi‐cle is operated under arduous conditions orincreased loads.
The ASSYST PLUS service interval display is onlyan aid. The driver ofthevehicle bearsresponsi‐bility asregardstowhether maintenanceworkneedstobe performed more oftenthan speci‐fied based onthe actual operating conditionsand/or loads.
Examples of arduous operating conditions:
Rregular city driving with frequent intermedi‐atestops
Rmainly short-distance driving
Maintenance and care351

Rfrequent operation in mountainousterrain oron poorroad surfaces
Rwhenthe engine is often leftidlingfor longperiods
Roperation in particularly dusty conditionsand/or if air-recirculation mode is frequentlyused
Inthese or similar operating conditions, havetheinterior airfilter, engine air cleaner, engine oiland oilfilteretc.changed more frequently. Thetires must bechecked more frequently ifthevehicle is operated under increased loads.Fur‐ther information can be obtained at aqualifiedspecialistworkshop.
Battery disconnection periods
The ASSYST PLUS service interval displaycan only calculatethe service due datewhenthe batteryis connected.
Notedownthe service due date displayed onthe instrument display before disconnectingthe battery (page 351).
Engine compartment
Opening/closingthe hood
\nWARNINGRisk of accident ifthe enginehood is unlatched while driving
An unlocked engine hood may open up whenthevehicle is in motion and blockyour view.
Never unlatchthe engine hood whiledriving.
Beforeevery trip, ensurethattheengine hood is latched.
\nWARNINGRisk of accident and injurywhen opening and closingthe enginehood
When opening or closingthe engine hood, itmay suddenly drop intothe end position.
There is arisk of injuryfor anyone intheengine hood'srange of movement.
Only open or closethe engine hoodwhenthere are no persons intheengine hood'srange of movement.
\nWARNINGDanger of burns when open‐ingthe hood
Ifyou openthe hood whenthe engine hasoverheated or during afireinthe enginecompartment,you could come into contactwith hotgases orother escaping operatingfluids.
Before openingthe hood, allowtheenginetocool down.
Intheevent of afireinthe engine com‐partment,keepthe hood closed andcallthefireservice.
\nWARNINGRisk of injuryduetomovingparts
Certain components inthe engine compart‐ment may continuetomoveor suddenlymoveagaineven afterthe ignition has beenswitched off, e.g.the coolerfan.
Makesure ofthefollowing before performingtasks inthe engine compartment:
Switchthe ignition off.
352Maintenance and care

Nevertouchthe danger zone surround‐ing moving component parts, e.g.therotation area ofthefan.
Removejewelry andwatches.
Keep items of clothing and hairawayfrom moving parts.
\nWARNINGRisk of injuryfromtouchingcomponent parts undervoltage
The ignition system andthe fuel injectionsystemworkunder highvoltage. Ifyoutouchcomponent parts which are undervoltage,you couldreceivean electric shock.
Nevertouch component parts oftheignition system orthe fuel injection sys‐tem whenthe ignition is switched on.
\nWARNINGRisk of burns from hot com‐ponent parts inthe engine compartment
Certain components inthe engine compart‐ment can beveryhot, e.g.the engine,theradiator and parts oftheexhaust system.
Allowthe enginetocool down and onlytouch component parts described inthefollowing.
\nWARNINGRisk of injuryfrom usingthewindshield wipers whilethe engine hoodis open
Whenthe engine hood is open andthe wind‐shield wipers are set in motion,you can betrappedbythe wiper linkage.
Always switch offthe windshield wipersand ignition before openingthe enginehood.
Toopen:pull lever1toreleasethe hood.
Maintenance and care353