2019 MERCEDES-BENZ SLC light

Switching the "windshield defrosting"
function on or off
XTurn the SmartKey to positionHin the igni-tion lock (Ypage 118).
XTo switch on:press thedbutton.The indicator lamp in thedbutton lightsup.
The climate control system switches to thefollowing functions:
Rhigh airflow
Rhigh temperature
Rair distribution to the windshield and frontside windows
Rair-recirculation mode off
XTo switch off:press thedbutton.The indicator lamp in thedbutton goesout. The previously selected settings arerestored. Air-recirculation mode remainsdeactivated.
or
XDual-zone automatic climate control: presstheXbutton.The indicator lamp in thedbutton goesout. Airflow and air distribution are set toautomatic mode.
MAX COOL maximum cooling
The MAX COOL function is only available invehicles for the USA.
MAX COOL is only operational when theengine is running.
XTo activate:press the

Problems with the rear window defroster
ProblemPossible causes/consequences andPPSolutions
The indicator lamp onthelbuttonflashes. The rear win-dow defroster has deac-tivated prematurely orcannot be activated.
The on-board voltage is too low because too many electrical con-sumers are switched on.
XSwitch off any consumers that are not required, e.g. readinglamps, interior lighting or the seat heating.When the battery is sufficiently charged, the rear windowdefroster can be activated again.
The roof is open.
XClose the roof.When the roof is closed, the rear window defroster can be activa-ted again.
Switching air-recirculation mode
on/off
General notes
If you switch on air-recirculation mode, thewindows can fog up more quickly, in particularat low temperatures. Only use air-recirculationmode briefly to prevent the windows from fog-ging up.
Activating/deactivating
XTurn the SmartKey to positionHin the igni-tion lock (Ypage 118).
XTo activate:press therbutton.The indicator lamp in therbutton lightsup.
iAir-recirculation mode is automaticallyactivated at high levels of pollution (dual-zone automatic climate control only) or athigh outside temperatures. When air-recir-culation mode is activated automatically,the indicator lamp in therbutton is notlit. Outside air is added after about30 minutes.
XTo deactivate:press therbutton.The indicator lamp in therbutton goesout.
iAir-recirculation mode deactivates auto-matically:
Rafter approximately five minutes at out-side temperatures below approximately41 ‡ (5 †)
Rafter approximately five minutes if coolingwith air dehumidification is deactivated
Rafter approximately 30 minutes at outsidetemperatures above approximately 41 ‡(5 †) if the "Cooling with air dehumidifi-cation" function is activated
Switching the residual heat on or off
General notes
The residual heat function is only available onvehicles for Canada.
It is possible to make use of the residual heatof the engine to continue heating the station-ary vehicle for up to 30 minutes after theengine has been switched off. The heatingtime depends on the set interior temperature.
Activating/deactivating
XTurn the SmartKey to position

Key positions with KEYLESS-GO
CStart/Stop button
DIgnition lock
As soon as the ignition is switched on, all theindicator lamps in the instrument cluster lightup. Further information on situations where anindicator lamp either fails to go out after start-ing the engine or lights up while driving(Ypage 210).
If Start/Stop buttonChas not yet beenpressed, this corresponds to the key beingremoved from the ignition.
XTo switch on the power supply:pressStart/Stop buttonConce.The power supply is switched on. You cannow activate the windshield wipers, forexample.
The power supply is switched off again if:
Rthe driver's door is opened and
Ryou press Start/Stop buttonCtwicewhen in this position
XTo switch on the ignition:press Start/Stop buttonCtwice.The ignition is switched on.
If you press Start/Stop buttonConcewhen in this position, the ignition isswitched off again.
Removing the Start/Stop button
You can remove the Start/Stop button fromthe ignition lock and start the vehicle as nor-mal using the SmartKey.
XRemove Start/Stop buttonCfrom ignitionlockD.
You do not have to remove the Start/Stop but-ton from the ignition lock when you leave thevehicle. You should, however, always take theSmartKey with you when leaving the vehicle.As long as the SmartKey is in the vehicle:
Rthe vehicle can be started using the Start/Stop button
Rthe electrically powered equipment can beoperated
Starting the engine
Important safety notes
GWARNING
If children are left unsupervised in the vehi-
cle, they could:
Roperate the vehicle's equipment
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake
Rshift the automatic transmission out of
park position]
Rstart the engine
There is a risk of an accident and injury.
Never leave children or animals unattended
in the vehicle.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. This
also applies for the Digital Vehicle Key if the
"Digital Vehicle Key" function is activated via
Mercedes me connect.
GDANGER
Combustion engines emit poisonous
exhaust gases such as carbon monoxide.
Inhaling these exhaust gases is hazardous to
health and can result in poisoning. There is a
risk of fatal injury. Therefore, never leave the
engine running an enclosed space without
adequate ventilation.
GWARNING
Flammable materials introduced through
environmental influence or by animals can
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starts automatically and the braking effect ofthe HOLD function is deactivated.
Automatic engine start
The engine starts automatically if:
Ryou switch off the ECO start/stop functionby pressing the ECO button
Ryou release the brake pedal in transmissionposition[or\\and the HOLD function isnot active
Ryou depress the accelerator pedal
Ryou engage reverse gear^
Ryou move the transmission out of position]
Ryou switch to drive programS+
Ryou unfasten your seat belt or open the driv-er's door
Rthe vehicle starts to roll
Rthe brake system requires this
Rthe temperature in the vehicle interior devi-ates from the set range
Rthe system detects moisture on the wind-shield when the air-conditioning system isswitched on
Rthe battery's condition of charge is too low
Shifting the transmission to position]doesnot start the engine.
Deactivating or activating the ECO
start/stop function
XTo deactivate:press ECO buttonC.Indicator lampDgoes out.
XTo activate:press ECO buttonC.Indicator lampDlights up.
If indicator lampDis off, the ECO start/stopfunction has been deactivated manually or asthe result of a malfunction. The engine willthen not be switched off automatically whenthe vehicle stops.
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Driving and parking

lamp may also light up. A message appearsin the multifunction display (Ypage 197).For further information on warning and indi-cator lamps in the instrument cluster, see(Ypage 213).
Problems with fuel and the fuel tank
ProblemPossible causes/consequences andPPSolutions
Fuel is leaking from thevehicle.The fuel line or the fuel tank is faulty.
GWARNING
Risk of explosion or fire.
XTurn the SmartKey immediately to position

Applying or releasing manually
XTo apply:push handleC.When the electric parking brake is applied,the redI(USA only) or$(Canadaonly) indicator lamp lights up in the instru-ment cluster.
The electric parking brake can also beapplied when the SmartKey is removed.
XTo release:pull handleC.The redI(USA only) or$(Canadaonly) indicator lamp in the instrument clus-ter goes out.
The electric parking brake can only bereleased:
Rwhen the SmartKey is in positionGin theignition lock (Ypage 118) or
Rif the ignition was switched on using theStart/Stop button
Applying automatically
The electric parking brake is automaticallyapplied when the transmission is in position]and:
Rthe engine is switched off or
Rthe driver is not wearing a seat belt and thedriver's door is opened
To prevent the electric parking brake frombeing automatically applied, pull handleC.
The electric parking brake is also applied auto-matically if:
RActive Distance Assist DISTRONIC bringsthe vehicle to a standstill or
Rthe HOLD function is keeping the vehiclestationary
In addition, at least one of the following condi-tions must be fulfilled:
Rthe engine is switched off
Rthe driver is not wearing a seat belt and thedriver's door is opened
Rthere is a system malfunction
Rthe power supply is insufficient
Rthe vehicle is stationary for a lengthy period
The redI(USA only) or$(Canadaonly) indicator lamp in the instrument clusterlights up.
The electric parking brake is not automaticallyapplied if the engine is switched off by theECO start/stop function.
Releasing automatically
The electric parking brake is released auto-matically when all of the following conditionsare fulfilled:
Rthe engine is running
RThe seat belt tongue is engaged in the beltbuckle
Rthe transmission is in position[or^andyou depress the accelerator pedal or shiftfrom position]to[or^
Rif the transmission is in position^, thetrunk lid must be closed
If the seat belt tongue is not engaged in theseat belt buckle, the following conditions mustbe fulfilled:
Rthe driver's door is closed
Ryou move the transmission out of position]or you have previously driven at a speedabove 2 mph (3 km/h)
Rif the transmission is in position^, thetrunk lid must be closed
When the electric parking brake is released,the$indicator lamp goes out in the instru-ment cluster.
Emergency braking
The vehicle can also be braked during anemergency by using the electric parking brake.
XWhile driving, push handleCof the electricparking brake.The vehicle is braked for as long as the han-dle of the electric parking brake is pressed.The longer the electric parking brake handleis depressed, the greater the braking force.
136Parking
Driving and pa rking

economical driving. A higher level indicates amore economical driving style. If the threeouter areas are completely filled at the sametime, the driver has adopted the most eco-nomical driving style for the selected settingsand prevailing conditions. The ECO displayborder lights up.
The ECO display does not indicate the actualfuel consumption. The additionally achievedrange displayed underBonus fr. startBonus fr. startdoesnot indicate a fixed consumption reduction.
In addition to driving style, the actual con-sumption is affected by other factors, such as:
Rload
Rtire pressure
Rcold start
Rchoice of route
Ractive electrical consumers
These factors are not included in the ECO dis-play.
An economical driving style specially requiresdriving at moderate engine speeds.
Achieving a higher value in the categories"Acceleration" and "Constant":
Robserve the gearshift recommendations.
Rdrive the vehicle in drive programCorE.
In urban traffic and stop-start traffic, drive pro-gramCis recommended.
On long journeys at a constant speed, e.g. onthe highway, only the outer area for "constant"will change.
The ECO display summarizes the driving stylefrom the start of the journey to its completion.Therefore, there are more marked changes inthe outer areas at the start of a journey. Onlonger journeys, there are fewer changes. Formore marked changes, perform a manual rest(Ypage 171).
Further information on the ECO display(Ypage 170).
Braking
Important safety notes
GWARNING
If you shift down on a slippery road surface
in an attempt to increase the engine's brak-
ing effect, the drive wheels could lose their
grip. There is an increased danger of skid-
ding and accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface.
Downhill gradients
!On long, steep gradients, you must reducethe load on the brakes. To use engine brak-ing, shift to a lower gear in good time. Thishelps you to avoid overheating the brakesand wearing them out excessively.
When making use of the engine brakingeffect, it is possible that a drive wheel maynot turn for some time, e.g. in the case ofsuddenly changing or slippery road surfaceconditions. This could cause damage to thedrive train. This type of damage is not cov-ered by the Mercedes-Benz warranty.
Change into a lower gear in good time on longand steep downhill gradients. This is especiallyimportant if the vehicle is laden.
This also applies if you have activated cruisecontrol or Active Distance Assist DISTRONIC.
Heavy and light loads
GWARNING
If you rest your foot on the brake pedal
while driving, the braking system can over-
heat. This increases the stopping distance
and can even cause the braking system to
fail. There is a risk of an accident.
Never use the brake pedal as a footrest.
Never depress the brake pedal and the
accelerator pedal at the same time.
!Depressing the brake pedal constantlyresults in excessive and premature wear tothe brake pads.
If the brakes have been subjected to a heavyload, do not stop the vehicle immediately, butdrive on for a short while. This allows the air-flow to cool the brakes more quickly.
Wet roads
If you have driven for a long time in heavy rainwithout braking, there may be a delayed reac-tion from the brakes when braking for the first
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time. This may also occur after the vehicle hasbeen washed or driven through deep water.
You then have to depress the brake pedalmore firmly. Maintain a greater distance fromthe vehicle in front.
After driving on a wet road or having the vehi-cle washed, brake firmly while paying attentionto the traffic conditions. This will warm up thebrake discs, thereby drying them more quicklyand protecting them against corrosion.
Limited braking performance on salt-
treated roads
If you drive on salted roads, a layer of salt resi-due may form on the brake discs and brakepads. This can result in a significantly longerbraking distance.
RIn order to prevent any salt build-up, applythe brakes occasionally while paying atten-tion to the traffic conditions.
RCarefully depress the brake pedal and thebeginning and end of a journey.
RMaintain a greater distance to the vehicleahead.
Servicing the brakes
!The brake fluid level may be too low, if:
Rif the red brake warning lamp lights up inthe instrument cluster and
Ryou hear a warning tone while the engineis running
Observe additional warning messages in themultifunction display.
The brake fluid level may be too low due tobrake pad wear or leaking brake lines.
Have the brake system checked immedi-ately. Consult a qualified specialist work-shop to arrange this.
!As the ESP®system operates automati-cally, the engine and the ignition must beswitched off (the SmartKey must be in posi-tion