MERCEDES-BENZ S CLASS 2019 Repair Manual

#Setthe front passenger seat asfar back aspossible and movethe seat intothe highestposition.
#Fullyretractthe seat cushion length adjust‐ment.
#Adjustthe seat cushion inclination sothatthe front edge ofthe seat cushion is inthehighest position andtherear edge oftheseat cushion is inthe lowestposition.
#Setthe seat backresttoan almostverticalposition.
#Installthechildrestraint system.The entire base ofthechildrestraint systemmust alwaysrestonthe seat cushion ofthefront passenger seat.
#Always make surethatthe shoulder beltstrap is correctlyrouted fromthe seat beltoutlet ofthevehicletothe shoulder beltguide onthechildrestraint system.The shoulder beltstrap must beroutedfor‐wards and downwards fromthe seat belt out‐let.
#If necessary,adjustthe seat belt outlet andthe front passenger seat accordingly.
Child safety locks
Activating/deactivating thechild safety lockfor therear doors
&WARNINGRisk of accident and injuryduetochildren and animals left unatten‐ded inthevehicle
Ifyou leavechildren and animals unattendedinthevehicle,theymay be abletosetthevehicle in motion,forexampleby:
RReleasingthe parking brake.
RShiftingthe automatic transmission outof park position].
RStartingthe engine.
In addition,theymay operatevehicle equip‐ment and become trapped.
#Never leavechildren and animals unat‐tended inthevehicle.
#When leavingthevehicle, alwaystakethe SmartKeywithyou and lockthevehicle.
&WARNINGRisk offatal injury duetoexposuretoextreme heat or cold inthevehicle
If people – particularlychildren – areexposedtoextremetemperaturesover anextended period of time,there is arisk ofserious orevenfatal injury.
#Never leaveanyone – particularlychil‐dren – unattended inthevehicle.
#Never leaveanimals inthevehicle unat‐tended.
&WARNINGRisk of accident and injuryduetochildren left unattended inthevehicle
Whenchildren are traveling inthevehicle,theycould:
Ropen doors,thereby endangeringotherpeople orroad users
Rgetout ofthevehicle and be hitbytraffic
Roperatevehicle equipment and becometrapped,forexample
Occupant safety59

#Whenchildren are traveling inthevehi‐cle, always activatetheavailablechildsafety locks.
#Never leavechildren unattended inthevehicle.
#When leavingthevehicle, alwaystakethekey withyou and lockthevehicle.
Child safety locksfortherear doors andtherearside windowsareavailable.Thechild safety lock ontherear doors secureseach door separately.The doors can no longerbe opened fromthe inside.
#Pressthe lever in direction1(activate) or2(deactivate).
#Make surethatthechild safety locksareworking properly.
Activating/deactivating thechild safety lockfor therear side windows
#Toactivate/deactivate:press button2.
Opening/closingthe side window intherearpassenger compartment is possible:
Rwith indicator lamp1lit: viathe switchonthe driver's door
60Occupant safety

Rwith indicator lamp1off: viathe switchonthe correspondingrear door or driv‐er's door
Whenthechild safety lock is activated,the con‐trols intherear passenger compartment are dis‐abledfor:
Rtherear side windows
Rthe adjustment ofthe front passenger seatfromtherear passenger compartment
Rtheroller sunblinds:
-oftherear side windows
-oftherear window
-intheroof
Notes on pets inthevehicle
&WARNINGRisk of accident and injuryduetoanimals left unsecured or unat‐tended inthevehicle
Ifyou leaveanimals inthevehicle unatten‐ded or unsecured,theycould possibly pressdown buttons or switches.
Therebyan animal may:
Ractivatevehicle equipment and becometrapped,forexample
Rswitchsystems on or off and endangerotherroad users
Unsecured animals may bethrown around inthevehicle intheevent of an accident orsuddensteering and braking maneuver andinjurevehicle occupants inthe process.
#Never leaveanimals inthevehicle unat‐tended.
#Always correctly secureanimals whiledriving,forexample using a suitableanimal carrier.
Occupant safety61

SmartKey
Overview of SmartKeyfunctions
&WARNINGRisk 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 out ofpark position].
Rstartingthe engine
#Never leavechildren and animals unat‐tended inthevehicle.
#When leavingthevehicle, alwaystakethe SmartKeywithyou and lockthevehicle.
#Keepthe SmartKeyout ofthereach ofchildren.
*NOTEDamagetothekey causedbymagneticfields
#Keepthekeyawayfromstrong mag‐neticfields.
1Locks
2Batterycheck lamp
3Unlocks
4Opens/closesthe trunk lid
5Panic alarm
The SmartKey locksand unlocksthefollowingcomponents:
RDoors
RTrunk lid
RFuelfillerflap
62Opening and closing

Ifyou do not openthevehicle within approx‐imately 40 seconds after unlocking:
RThevehicle is locked again
RAnti-theft protection isreactivated
Do notkeepthe SmartKeytogether with elec‐tronic devices or metal objects. This can affectthe SmartKey's functionality.
Do notkeepthe SmartKeyinthetemperature-controlled cup holder. Otherwise,the SmartKeywill not bereliably detected.
%If batterycheck lamp2does not light upafter pressingthe6or7button,thebattery is discharged.
Activating/deactivating the acoustic lockingverification signal
Multimedia system:
,Vehicle.îVehicle Set-
tings.Acoustic 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‐
Opening and closing63

Key .Todo so, deactivatethe SmartKeyfunc‐tions.
#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 (→page169).
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
&DANGERSerious 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.
64Opening and closing

Requirements:RYourequire a CR 2032 3 V cell battery.
Mercedes-Benzrecommendsthatyou havethebatteryreplaced at aqualified specialistwork‐shop.
#Removethe mechanicalkey (→page64).
#Pressrelease button2down fully andremovecover1.
#Removebattery compartment3andtakeoutthe discharged battery.
#Insertthe new battery into battery compart‐ment3. Observethe positive pole markinginthe battery compartment and onthe bat‐tery.
#Push in battery compartment3.
#Replace cover1sothat it engages.
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 closing65

ProblemPossible causes/consequences andPPSolutions
RThe SmartKeyis defective.
#Checkthe battery usingthe batterycheck lamp andreplace if necessary (→page64).
#Usethe emergencykeytolock or unlock (→page64).
#Havethe SmartKeychecked at aqualified specialistworkshop.
You havelost a SmartKey.#Havethe SmartKeydeactivated at aqualified specialistworkshop.
#If necessary,havethe mechanical lockchanged aswell.
Doors
Unlocking and opening doors fromthe inside
#Tounlockand open a front door:pull doorhandle2.Locking pin1pops up whenthe door isunlocked.
#Tounlockarear door:pulltherear doorhandle.The locking pin pops up whentherear dooris unlocked.
#Toopen arear door:pulltherear door han‐dle again.
66Opening and closing

Locking/unlockingthevehicle centrally fromthe inside
#Tounlock:press button1.
#Tolock:press button2.
This does not lock or unlockthe fuelfillerflap.
Thevehicle is not unlocked:
RIfyou havelockedthevehicle usingtheSmartKey.
RIfyou havelockedthevehicle using KEY‐LESS-GO.
Locking/unlockingthevehicle with KEY‐LESS-GO
Requirements:RThe SmartKeyis outsidethevehicle.
RThe distance betweenthe SmartKeyandthevehicle does notexceed 3ft(1 m).
RThe driver's door andthe door at whichthedoor handle is used are closed.#Tounlockthevehicle:touchthe inner sur‐face ofthe door handle.
#Tolockthevehicle:touch sensor surface1or2.
#Convenience closing:touchrecessed sen‐sor surface2for anextended period.
%Further information on convenience closing(→page80).
Opening and closing67

Ifyou openthe trunk lid from outside,the trunklid is automatically unlocked.
Problems with KEYLESS-GO
ProblemPossible causes/consequences andPPSolutions
You can no longer lock or unlockthevehicle using KEYLESS-GO.Possible causes are:
RThe SmartKeybattery isweak or discharged.
RThere is interference from a powerfulradio signal source.
RThe SmartKeyis defective.
#Checkthe battery usingthe batterycheck lamp andreplace if necessary (→page64).
#Usethe mechanicalkeytolock or unlockthevehicle (→page64).
#Havethevehicle and SmartKeychecked at aqualified specialistworkshop.
Switchingthe automatic lockingfeatureon/off
Thevehicle is locked automatically whentheignition is switched on andthe wheels are turn‐ingfasterthanwalking pace.
68Opening and closing