2019 MERCEDES-BENZ SLC warning light

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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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

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

Active Distance Assist DISTRONIC
General notes
Active Distance Assist DISTRONIC regulatesthe speed and automatically helps you main-tain the distance from the vehicle detected infront. Vehicles are detected with the aid of theradar sensor system. Active Distance AssistDISTRONIC brakes automatically to avoidexceeding the set speed or to maintain thedesignated distance from the vehicle in front.
Change into a lower gear in good time on longand steep downhill gradients. This is especiallyimportant if the vehicle is laden. By doing so,you will make use of the braking effect of theengine. This relieves the load on the brake sys-tem and prevents the brakes from overheatingand wearing too quickly.
If Active Distance Assist DISTRONIC detectsthat there is a risk of a collision with the vehi-cle in front, you will be warned visually andaudibly. Active Distance Assist DISTRONICcannot prevent a collision without your inter-vention. An intermittent warning tone will thensound and the distance warning lamp will lightup in the instrument cluster. Brake immedi-ately in order to increase the distance fromthe vehicle in front, or take evasive action, pro-vided it is safe to do so.
For Active Distance Assist DISTRONIC toassist you when driving, the radar sensor sys-tem must be operational.
Active Distance Assist DISTRONIC operates inthe speed range between 0 mph (0 km/h) and120 mph (200 km/h).
Do not use Active Distance Assist DISTRONICon roads with steep gradients.
As Active Distance Assist DISTRONIC trans-mits radar waves, it can resemble the radardetectors of the responsible authorities. Youcan refer to the relevant chapter in the Opera-tor's Manual if questions are asked about this.
iUSA only: This device has been approvedby the FCC as a "Vehicular Radar System".The radar sensor is intended for use in anautomotive radar system only. Removal,tampering, or altering of the device will voidany warranties, and is not permitted by theFCC. Do not tamper with, alter, or use in anynon-approved way.
Any unauthorized modification to this devicecould void the user's authority to operatethe equipment.
iCanada only: This device complies withRSS-210 of Industry Canada. Operation issubject to the following two conditions:
1. This device may not cause interference,and
2. This device must accept any interferencereceived, including interference that maycause undesired operation of the device.
Removal, tampering, or altering of thedevice will void any warranties, and is notpermitted. Do not tamper with, alter, or usein any non-approved way.
Any unauthorized modification to this devicecould void the user's authority to operatethe equipment.
Important safety notes
GWARNING
Active Distance Assist DISTRONIC does not
react to:
Rpeople or animals
Rstationary objects in the road, e.g. stop-
ped or parked vehicles
Roncoming vehicles and crossing traffic
As a result, Active Distance Assist
DISTRONIC may neither give warnings nor
intervene in such situations. There is a risk
of an accident.
Always pay careful attention to the traffic
situation and be ready to brake.
GWARNING
Active Distance Assist DISTRONIC does not
react to:
Rpeople or animals
Rstationary objects in the road, e.g. stop-
ped or parked vehicles (vehicles without
the Driving Assistance package)
Rstationary objects in the road, e.g. stop-
ped or parked vehicles, if sufficient detec-
tion is not possible (vehicles with the Driv-
ing Assistance package)
Roncoming vehicles and crossing traffic
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Active Distance Assist DISTRONIC has not yetdetected the vehicle in front on the edge ofthe road because of its narrow width. The dis-tance to the vehicle in front will be too short.
Obstructions and stationary vehicles
Active Distance Assist DISTRONIC does notbrake for obstacles or stationary vehicles. If,for example, the detected vehicle turns a cor-ner and an obstacle or stationary vehicle isrevealed, Active Distance Assist DISTRONICwill not brake for them.
Crossing vehicles
Active Distance Assist DISTRONIC may mis-takenly detect vehicles that are crossing yourlane.
If you activate Active Distance AssistDISTRONIC under the following conditions, thevehicle could pull away unintentionally:
Rat traffic lights with crossing traffic, forexample
Rif there is a vehicle in front, after a crossing,with the HOLD function activated
HOLD function
General notes
The HOLD function can assist the driver in thefollowing situations:
RWhen pulling away, especially on steepslopes
RWhen maneuvering on steep slopes
RWhen waiting in traffic
The vehicle is kept stationary without thedriver having to depress the brake pedal.
The braking effect is canceled and the HOLDfunction deactivated when you depress theaccelerator pedal to pull away.
Important safety notes
GWARNING
If the vehicle is only braked using the HOLD
function, the vehicle may roll away in the fol-
lowing situations when you leave the vehi-
cle:
Rif there is a malfunction in the system or
in the voltage supply
Rif the HOLD function is deactivated by
depressing the accelerator pedal or brake
pedal, e.g. by a vehicle occupant
There is a risk of an accident.
Always deactivate the HOLD function and
secure the vehicle against rolling away
before you leave it.
!When Active Distance Assist DISTRONICor the HOLD function is activated, the vehi-cle brakes automatically in certain situa-tions.
To avoid damage to the vehicle, deactivateActive Distance Assist DISTRONIC and theHOLD function in the following or similar sit-uations:
Rwhen towing the vehicle
Rin the car wash
Deactivating the HOLD function (Ypage 152).
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Range of the sensors
General notes
Parking Assist PARKTRONIC does not take intoaccount obstacles located:
Rbelow the detection range, such as persons,animals or objects
Rabove the detection range, e.g. overhangingloads, tail sections or loading ramps oftrucks
CSensors in the front bumper, left-hand side(example)
The sensors must be free from dirt, ice orslush. They can otherwise not function cor-rectly. Clean the sensors regularly, taking carenot to scratch or damage them (Ypage 250).
Range
Front sensors
CenterApprox. 40 in (approx.100 cm)
CornersApprox. 24 in (approx.60 cm)
Rear sensors
CenterApprox. 48 in (approx.120 cm)
CornersApprox. 32 in (approx.80 cm)
Minimum distance
CenterApprox. 8 in (approx.20 cm)
CornersApprox. 6 in (approx.15 cm)
If there is an obstacle within this range, therelevant warning displays light up and a warn-ing tone sounds. If the distance falls below theminimum, the distance may no longer beshown.
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Problems with Parking Assist PARKTRONIC
ProblemPossible causes/consequences andPPSolutions
Only the red segmentsin the Parking AssistPARKTRONIC warningdisplays are lit. You alsohear a warning tone forapproximately two sec-onds.
Parking AssistPARKTRONIC is deacti-vated after approx-imately 20 seconds andthe indicator lamp inthe Parking AssistPARKTRONIC buttonlights up.
Parking Assist PARKTRONIC has malfunctioned and has been deac-tivated.
XIf problems persist, have Parking Assist PARKTRONIC checked ata qualified specialist workshop.
Only the red segmentsin the Parking AssistPARKTRONIC warningdisplays are lit. ParkingAssist PARKTRONIC isdeactivated afterapproximately five sec-onds.
The Parking Assist PARKTRONIC sensors are dirty or there is inter-ference.
XClean the Parking Assist PARKTRONIC sensors (Ypage 250).
XSwitch the ignition back on.
The problem may be caused by an external source of radio or ultra-sound waves.
XCheck to see if Parking Assist PARKTRONIC works at a differentlocation.
Parking Guidance
Important safety notes
Parking Guidance is an electronic parking aidwith ultrasound. Ultrasound is used to meas-ure the road on both sides of the vehicle. Asuitable parking space is indicated by theparking symbol. You receive steering instruc-tions when parking. You can also still useParking Assist PARKTRONIC (Ypage 153).
Parking Guidance is only an aid. It is not areplacement for your attention to your immedi-ate surroundings. You are always responsiblefor safe maneuvering, parking and exiting aparking space. Make sure that there are nopersons, animals or objects in the maneuver-ing area when you are maneuvering or parking.
GWARNING
If objects are located above the detection
range, Parking Guidance may provide steer-
ing instructions too soon. You may cause a
collision as a result. There is a risk of an
accident.
If objects are located above the detection
range, stop and switch off Parking Assist.
!If they cannot be avoided, drive overobstacles such as curbs slowly and at anobtuse angle. Otherwise, you may damagethe wheels or tires.
When Parking Assist PARKTRONIC is switchedoff, Parking Guidance is also unavailable.
Parking Guidance may also display spaces notsuitable for parking, e.g.:
Rwhere parking or stopping is prohibited
Rin front of driveways or entrances and exits
Ron unsuitable surfaces
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