2019 MERCEDES-BENZ S CLASS Owners Manual

The electrical fuses are located inthefollowingfuse boxes:
RFuse box inthe engine compartment onthedriver's side (→page 431)
RFuse box onthe driver's side ofthe cockpit(→page 432)
RFuse box inthe front passengerfootwell(→page 432)
RFuse box inthe trunk ontheright-hand sideofthevehicle when viewed inthe direction oftravel (→page 433)
Opening and closingthe fuse box intheengine compartment
Requirements:RObservethe notes on electrical fuses(→page 430).
RHavethefollowingtoolsreadilyavailable:
-a dry cloth
-a screwdriver
Opening
&WARNINGRisk 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.
#Releaseretaining clips1.Pull cover2up.
Breakdown assistance431

#Removeanyexisting moisture fromthe fusebox using a dry cloth.
#Loosen screws4, andremovefuse box lid3fromthetop.
Closing
#Check whetherthe seal is positioned cor‐rectly in lid3.
#Insert lid3intothe bracket attherear ofthe fuse box.
#Fold down lid3ofthe fuse box and tightenscrews4.
#Insert cover2on bothsides and engageretaining clips1.
#Closethe hood.
Opening and closingthe fuse box inthecockpit
Requirements:RObservethe notes on electrical fuses(→page 430).
#Open cover1inthe direction ofthe arrowandremoveit.
Opening and closingthe fuse box inthe frontpassengerfootwell
Requirements:RObservethe notes on electrical fuses(→page 430).
432Breakdown assistance

#Open cover1inthe direction ofthe arrowandremoveit.
Opening and closingthe fuse box inthetrunk
Requirements:RObservethe notes on electrical fuses(→page 430).
#Fold cover1down inthe direction ofthearrow.
Breakdown assistance433

Notes on noise or unusual handlingcharac‐teristics
While driving, pay attentiontovibrations, noisesand unusual handlingcharacteristics, e.g. pullingtoone side. This may indicatethatthe wheels ortires are damaged. Ifyou suspectthat a tire isdefective,reduceyour speed immediately.Stopthevehicle as soon as possibletocheckthewheels and tiresfor damage. Hidden tire dam‐age could also be causingthe unusual handlingcharacteristics. Ifyoufind no signs of damage,havethe tires and wheelschecked at aqualifiedspecialistworkshop.
Notes onregularlyinspecting wheels andtires
&WARNINGRisk of accident from dam‐aged tires
Damaged tires can cause tire pressure loss.
As aresult,you could lose control ofyourvehicle.
#Checkthe tiresregularlyfor signs ofdamageandreplace any damaged tiresimmediately.
&WARNINGRisk of aquaplaning duetoinsufficient tire tread
Insufficient tire tread willresult inreducedtire grip. The tire tread is no longer abletodissipatewater.
This meansthat in heavyrain or slushtherisk ofhydroplaning is increased, in particu‐lar ifvehicle speed is not adaptedtosuittheconditions.
Ifthe tire pressure istoo high ortoo low,tires mayexhibit different levels ofwear atdifferent locations onthe tire contact sur‐face.
#Thus,you shouldregularlycheckthetread depth andthe condition ofthe tirecontact surface acrossthe entire widthof all tires.
Minimum tread depthfor:
RSummer tires:

Six marks1show wherethe bar indicators(arrow) are integrated intothe tire tread. Theyare visible once a tread depthof approximately

RThe tires maywearexcessively and/orunevenly,which maygreatlyimpair tiretraction.
RThe drivingcharacteristics, aswell assteering and braking, may be greatlyimpaired.
#Comply withtherecommended tirepressure andcheckthe tire pressure ofall tires includingthe spare wheelregu‐larly:
Rat least once a month
Rwhenthe loadchanges
Rbefore embarking on a longer journey
Rif operating conditionschange, e.g. off-road driving
#Adjustthe tire pressure as necessary.
Driving withtire pressurethat istoo high ortoolow can:
RShortenthe service life ofthe tires.
RCause increased tire damage.
RAdversely affect drivingcharacteristics andthus driving safety,e.g. dueto hydroplaning.
&WARNINGRisk of an accident duetoinsufficient tire pressure
Tires with pressurethat istoo low canover‐heat and burstas aresult.
In addition,theyalso suffer fromexcessiveand/or irregularwear, which can significantlyimpairthe braking properties andthe han‐dlingcharacteristics.
#Avoidexcessively low tire pressures inallthe tires, includingthe spare wheel.
Tirepressure which istoo low can cause:
RTiredefects as aresult ofoverheating
RImpaired handlingcharacteristics
RIrregularwear
RIncreased fuel consumption
&WARNINGRisk of accident fromexces‐sive tire pressure
Tires withexcessively high pressure canburst becausetheyare damaged more easilybyhighwayfill, pot holesetc.
In addition,theyalso suffer from irregularwear, which can significantly impairthe brak‐ing properties andthe handlingcharacteris‐tics.
#Avoidexcessively high tire pressures inallthe tires, includingthe spare wheel.
Excessively high tire pressure canresult in:
RIncreased braking distance
RImpaired handlingcharacteristics
RIrregularwear
RImpaired driving comfort
RSusceptibilitytodamage
436Wheels and tires

&WARNINGRisk 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 (→page442).
RTirepressuretable onthe inside ofthe fuelfillerflap (→page 437).
Observethe maximum tire pressure(→page448).
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.
&WARNINGRisk 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 tires437

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 (→page449).
Be suretoalso observethefollowing furtherrelated subjects:
RNotes on tire pressure (→page 435)
RTireand Loading Information placard(→page442)
RMaximum tire pressure (→page448)
Checkingtire 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.
#Screwthevalve cap ontothevalve.
438Wheels and tires