sensor MERCEDES-BENZ SL CLASS 2019 Owner's Guide

Either no braking application, or a course-cor-recting brake application adapted to the driv-ing situation occurs if:
Rthere are vehicles or obstacles, e.g. crashbarriers, located on both sides of your vehi-cle.
Ra vehicle approaches you too closely at theside.
Ryou have adopted a sporty driving style withhigh cornering speeds.
Ryou clearly brake or accelerate.
Ra driving safety system intervenes, e.g.
ESP®or PRE-SAFE®Brake.
RESP®is switched off.
Ra loss of tire pressure or a defective tire isdetected.
Switching on Active Blind Spot Assist
XMake sure that Active Blind Spot Assist isactivated (Ypage 199).
XTurn the SmartKey to positionHin the igni-tion lock.Warning lampsCin the exterior mirrorslight up red for approximately 1.5 secondsand then turn yellow.
Active Lane Keeping Assist
General notes
Active Lane Keeping Assist monitors the areain front of your vehicle by means of multifunc-tion cameraCat the top of the windshield.Various areas to the front, rear and side ofyour vehicle are also monitored with the aid ofthe radar sensor system. Active Lane KeepingAssist detects lane markings on the road andcan warn you before you leave your lane unin-tentionally. If you do not react to the warning,a lane-correcting application of the brakes canbring the vehicle back into the original lane.
This function is available in a speed rangebetween 40 mph and 120 mph (60 km/h and200 km/h).
For Active Lane Keeping Assist to assist youwhen driving, the radar sensor system must beoperational.
Important safety notes
If you fail to adapt your driving style, ActiveLane Keeping Assist can neither reduce therisk of accident nor override the laws of phys-ics. Active Lane Keeping Assist cannot takeinto account road, weather or traffic condi-tions. Active Lane Keeping Assist is only anaid. You are responsible for the distance to thevehicle in front, for vehicle speed, for brakingin good time and for staying in your lane.
Active Lane Keeping Assist cannot continu-ously keep your vehicle in its lane.
GWARNING
Active Lane Keeping Assist cannot always
clearly detect lane markings.
Driving systems187
Driving an d parking
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Important safety notes
GWARNING
If you operate information systems and com-
munication equipment integrated in the
vehicle when driving, you may be distracted
from the traffic situation. You could also
lose control of the vehicle. There is a risk of
an accident.
Only operate this equipment when the traffic
situation permits. If you are not sure that
this is possible, park the vehicle paying
attention to traffic conditions and operate
the equipment when the vehicle is station-
ary.
You must observe the legal requirements forthe country in which you are currently drivingwhen operating the on-board computer.
GWARNING
If the instrument cluster has failed or mal-
functioned, you may not recognize function
restrictions in systems relevant to safety.
The operating safety of your vehicle may be
impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately.
The on-board computer only shows messagesor warnings from certain systems in the multi-function display. You should therefore makesure your vehicle is operating safely at alltimes.
If the operating safety of your vehicle isimpaired, pull over as soon as it is safe to doso. Contact a qualified specialist workshop.
For an overview, see the instrument panelillustration (Ypage 33).
Displays and operation
Instrument cluster lighting
The lighting in the instrument cluster, in thedisplays and the controls in the vehicle interiorcan be adjusted using the brightness controlknob.
The brightness control knob is located on thebottom left of the instrument cluster(Ypage 33).
XTurn the brightness control knob clockwiseor counter-clockwise.If you turn the light switch (Ypage 109) totheX,`orXposition, the bright-ness will depend upon the brightness of theambient light.
The light sensor in the instrument clusterautomatically controls the brightness of themultifunction display. In daylight, the dis-plays in the instrument cluster are not illu-minated.
Speedometer with segments
The segments in the speedometer indicatewhich speed range is available.
RCruise control activated (Ypage 154):
The segments light up from the storedspeed to the maximum speed.
RActive Distance Assist DISTRONIC activated(Ypage 156):
One or two segments in the set speed rangelight up.
RActive Distance Assist DISTRONIC detects avehicle in front moving more slowly than thestored speed:
The segments between the speed of thevehicle in front and the stored speed lightup.
Tachometer
!Do not drive in the overrevving range, asthis could damage the engine.
The red band in the tachometer indicates theengine's overrevving range.
The fuel supply is interrupted to protect theengine when the red band is reached.
Outside temperature display
You should pay special attention to road con-ditions when temperatures are around freezingpoint.
190Displays and operation
On-board computer and displays

Display messagesPossible causes/consequences andPPSolutions
The yellow$warning lamp lights up and the redI(USAonly) or$(Canada only) indicator lamp flashes.
It is not possible to apply the electric parking brake manually.
XShift the transmission to position].
XVisit a qualified specialist workshop.
'(USA only)
M(Canada only)
Check Brake FluidCheck Brake FluidLevelLevel
There is not enough brake fluid in the brake fluid reservoir.
In addition, the'(USA only) orM(Canada only) warninglamp lights up in the instrument cluster and a warning tone sounds.
GWARNING
The braking effect may be impaired.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions. Do not continue drivingunder any circumstances.
XSecure the vehicle against rolling away (Ypage 146).
XConsult a qualified specialist workshop.
XDo not add brake fluid. This does not correct the malfunction.
&
Check Brake PadCheck Brake PadWearWear
The brake pads/linings have reached their wear limit.
XVisit a qualified specialist workshop.
PRE-SAFE Inopera‐PRE-SAFE Inopera‐tive See Opera‐tive See Opera‐tor's Manualtor's Manual
Important functions of PRE-SAFE®have failed. All other occupantsafety systems, e.g. air bags, remain available.
XVisit a qualified specialist workshop immediately.
Active BrakeActive BrakeAssist FunctionsAssist FunctionsCurrently LimitedCurrently LimitedSee Operator's Man‐See Operator's Man‐ualual
Active Brake Assist is temporarily inoperative.
Possible causes are:
Rthe radar sensor system is temporarily inoperative, e.g. due toelectromagnetic radiation emitted by nearby TV or radio stationsor other sources of electromagnetic radiation
Rthe system is outside the operating temperature range
Rthe on-board voltage is too low
When the causes stated above no longer apply, the display messagedisappears.
Active Brake Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XRestart the engine.
Displaymessages211
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
Active BrakeActive BrakeAssist FunctionsAssist FunctionsLimited See Opera‐Limited See Opera‐tor's Manualtor's Manual
Active Brake Assist is unavailable due to a malfunction.
XVisit a qualified specialist workshop.
Active BrakeActive BrakeAssist FunctionsAssist FunctionsCurrently LimitedCurrently LimitedSee Operator's Man‐See Operator's Man‐ualual
Active Brake Assist with cross-traffic function or PRE‑SAFE®PLUS isdeactivated and temporarily inoperative.
Possible causes are:
Rthe system is outside the operating temperature range
Rthe on-board voltage is too low
Rthe radar sensor system is temporarily inoperative, e.g. due toelectromagnetic radiation emitted by nearby TV or radio stationsor other sources of electromagnetic radiation
RMercedes-AMG vehicles: ESP®is deactivated
When the causes stated above no longer apply, the display messagedisappears.
Active Brake Assist with cross-traffic function and PRE‑SAFE®PLUSare functional again.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XRestart the engine.
XMercedes-AMG vehicles: switch ESP®on again (Ypage 68).
Active BrakeActive BrakeAssist FunctionsAssist FunctionsLimited See Opera‐Limited See Opera‐tor's Manualtor's Manual
Active Brake Assist with cross-traffic function or PRE‑SAFE®PLUS isnot available due to a malfunction.
XVisit a qualified specialist workshop.
212Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
Radar SensorsRadar SensorsDirty See Opera‐Dirty See Opera‐tor's Manualtor's Manual
The radar sensor system is malfunctioning.
Possible causes are:
Rdirt on sensors
Rheavy rain or snow
Rwhen driving on inter-urban roads without traffic or infrastructure,e.g. in desert-like areas
At least one driving system or driving safety system is malfunction-ing or is temporarily unavailable:
RActive Brake Assist
RActive Brake Assist with cross-traffic function
RActive Distance Assist DISTRONIC
RActive Steering Assist
RActive Lane Keeping Assist
RActive Blind Spot Assist
RPRE-SAFE®PLUS
If the radar sensor system in front is dirty, Active Blind Spot Assistwill not perform a course-correcting brake application.
Once the cause of the problem is no longer present, the driving anddrive safety systems will be available again. The display messagedisappears.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XSwitch off the engine.
XClean all sensors (Ypage 275).
XRestart the engine.The display message disappears.
g
Malfunction Ser‐Malfunction Ser‐vice Requiredvice Required
The roll bars are faulty.
GWARNING
The roll bars will then possibly not be extended in the event of anaccident.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
Displaymessages213
On-b oard computer and displays
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Display messagesPossible causes/consequences andPPSolutions
cator lamp remains lit or goes out depends on how OCS classifiesthe occupant.
If the conditions are not fulfilled, the system is not operating cor-rectly.
XVisit a qualified specialist workshop immediately.
Observe the additional information on OCS (Ypage 48).
Lights
Display messagesPossible causes/consequences andPPSolutions
I
Check Left LowCheck Left LowBeamBeam(Example)
The corresponding bulb is faulty.
XVisit a qualified specialist workshop.
or
XCheck whether you are permitted to replace the bulb yourself(Ypage 113).
LED light sources: the display message for the corresponding lamponly appears when all the LEDs in the lamp have failed.
I
Active HeadlampsActive HeadlampsInoperativeInoperative
The active light function is faulty.
XVisit a qualified specialist workshop.
I
Malfunction SeeMalfunction SeeOperator's ManualOperator's Manual
The exterior lighting is malfunctioning.
XVisit a qualified specialist workshop.
I
Auto Lamp FunctionAuto Lamp FunctionInoperativeInoperative
The light sensor is defective.
XVisit a qualified specialist workshop.
I
Switch Off LightsSwitch Off Lights
The lights are still switched on when you leave the vehicle. A warn-ing tone also sounds.
XTurn the light switch to positionX.
Displaymessages217
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
Active Lane Keep‐Active Lane Keep‐ing Assist Cur‐ing Assist Cur‐rently Unavailablerently UnavailableSee Operator's Man‐See Operator's Man‐ualual
Active Lane Keeping Assist is deactivated and temporarily inopera-tive.
Possible causes are:
Rthe windshield in the camera's field of vision is dirty
Rvisibility is impaired due to heavy rain, snow or fog
Rthere have been no lane markings for an extended period
Rthe lane markings are worn away, dark or covered up, e.g. by dirtor snow
When the causes stated above no longer apply, the display messagedisappears.
Active Lane Keeping Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XClean the windshield.
Active Lane Keep‐Active Lane Keep‐ing Assist Inopera‐ing Assist Inopera‐tivetive
Active Lane Keeping Assist is malfunctioning.
XVisit a qualified specialist workshop.
Active Blind SpotActive Blind SpotAssist CurrentlyAssist CurrentlyUnavailable SeeUnavailable SeeOperator's ManualOperator's Manual
Active Blind Spot Assist is temporarily inoperative.
Possible causes are:
Rthe radar sensor system is outside the operating temperaturerange
Rthe radar sensor system is temporarily inoperative, e.g. due toelectromagnetic radiation emitted by nearby TV or radio stationsor other sources of electromagnetic radiation
The yellowcindicator lamps also light up in the exterior mirrors.
When the causes stated above no longer apply, the display messagedisappears.
Active Blind Spot Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XClean the sensors (Ypage 275).
XRestart the engine.
Active Blind SpotActive Blind SpotAssist InoperativeAssist InoperativeActive Blind Spot Assist is malfunctioning.
The yellowcindicator lamps also light up in the exterior mirrors.
XVisit a qualified specialist workshop.
Displaymessages223
On-b oard computer and displays
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Display messagesPossible causes/consequences andPPSolutions
Active DistanceActive DistanceAssist CurrentlyAssist CurrentlyUnavailable SeeUnavailable SeeOperator's ManualOperator's Manual
Active Distance Assist DISTRONIC is temporarily inoperative.
Active Steering Assist is also temporarily inoperative.
Possible causes are:
Rthe radar sensor system is temporarily inoperative, e.g. due toelectromagnetic radiation emitted by nearby TV or radio stationsor other sources of electromagnetic radiation
Rthe system is outside the operating temperature range
Rthe on-board voltage is too low
A warning tone also sounds.
When the causes stated above no longer apply, the display messagedisappears.
Active Distance Assist DISTRONIC is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XRestart the engine.
Active DistanceActive DistanceAssist InoperativeAssist InoperativeActive Distance Assist DISTRONIC is faulty.
The following may have also failed:
RBrake Assist with cross-traffic function
RActive Brake Assist with cross-traffic function
RActive Steering Assist
A warning tone also sounds.
XVisit a qualified specialist workshop.
Act. DistanceAct. DistanceAssist SuspendedAssist SuspendedYou have depressed the accelerator pedal. Active Distance AssistDISTRONIC is no longer controlling the speed of the vehicle.
XRemove your foot from the accelerator pedal.
Distance Assist--Distance Assist--- mph- mphA condition for activating Active Distance Assist DISTRONIC has notbeen met.
XCheck the activation conditions for Active Distance AssistDISTRONIC (Ypage 156).
Display messages225
On-board computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
Tire Press. Moni‐Tire Press. Moni‐tor Currentlytor CurrentlyUnavailableUnavailable
Because there is interference from a strong source of radio waves,no signals from the tire pressure sensors are detected. The tirepressure monitor is temporarily malfunctioning.
XDrive on.The tire pressure monitor restarts automatically as soon as theproblem has been resolved.
TirePress. Sen‐TirePress. Sen‐sor(s) Missingsor(s) MissingThere is no signal from the tire pressure sensor of one or severalwheels. The pressure of the affected tire does not appear in themultifunction display.
XHave the faulty tire pressure sensor replaced at a qualified spe-cialist workshop.
Tire Pressure Moni‐Tire Pressure Moni‐tor Inoperative Notor Inoperative NoWheel SensorsWheel Sensors
The wheels mounted do not have a suitable tire pressure sensor.The tire pressure monitor is deactivated.
XMount wheels with suitable tire pressure sensors.The tire pressure monitor is activated automatically after drivingfor a few minutes.
Tire Press. Moni‐Tire Press. Moni‐tor Inoperativetor InoperativeThe tire pressure monitor is faulty.
XVisit a qualified specialist workshop.
Vehicle
Display messagesPossible causes/consequences andPPSolutions
Shift to 'P' orShift to 'P' or'N' to Start Engine'N' to Start EngineYou have attempted to start the engine with the transmission inposition^or[.
XShift the transmission to position]or\\.
Apply Brake toApply Brake toShift from 'P'Shift from 'P'You have attempted to shift the transmission to position[,^or\\without depressing the brake pedal.
XDepress the brake pedal.
To Shift out of PTo Shift out of Por N, Depressor N, DepressBrake and SwitchBrake and Switchon Engineon Engine
You have attempted to shift the transmission out of position]or\\into another transmission position with the engine switched off.
XDepress the brake pedal.
XStart the engine.
Driver's Door OpenDriver's Door Open& Transmission Not& Transmission Notin P Risk of Vehi‐in P Risk of Vehi‐cle Rolling Awaycle Rolling Away
The driver's door is not fully closed and the transmission is in posi-tion^,\\or[.
A warning tone also sounds.
GWARNING
The vehicle may roll away.
There is a risk of an accident.
XWhen parking the vehicle, shift the transmission to position].
228Displaymessages
On-b oard computer and displays

Cleaning the exterior lighting
!Only use cleaning agents or cleaningcloths that are suitable for plastic lenses.Caustic, irritant or otherwise unsuitablecleaning agents or cleaning cloths couldscratch or damage the exterior lighting plas-tic lenses.
XClean the plastic lenses of the exterior lightswith a wet sponge and a mild cleaningagent, e.g. Mercedes-Benz car shampoo orcleaning cloths.
Cleaning the mirror turn signals
!Only use cleaning agents or cleaningcloths that are suitable for plastic lenses.Unsuitable cleaning agents or cleaningcloths could scratch or damage the plasticlenses of the mirror turn signals.
XClean the plastic lenses of the mirror turnsignals in the exterior mirror housing using awet sponge and mild cleaning agent, e.g.Mercedes-Benz car shampoo or with clean-ing cloths.
Cleaning the sensors
!If you clean the sensors with a powerwasher, make sure that you keep a distanceof at least 11.8 in(30 cm) between the vehi-cleand the power washer nozzle. Informa-tion about the correct distance is availablefrom the equipment manufacturer.
XClean sensorsCof the driving systemswith water, car shampoo and a soft cloth.
Cleaning the reversing camera
!Do not clean the camera lens and the areaaround the rear view camera with a powerwasher.
XUse clean water and a soft cloth to cleancamera lensC.
Cleaning the exhaust pipe
GWARNING
The exhaust tail pipe and tail pipe trim can
become very hot. If you come into contact
with these parts of the vehicle, you could
burn yourself. There is a risk of burns.
Always be particularly careful and supervise
children closely around the exhaust pipe and
the exhaust pipe trims. Allow these compo-
nents to cool down before touching them.
!Do not clean the exhaust pipe with acid-based cleaning agents, such as bathroomcleaner or wheel cleaner.
XClean the exhaust pipe with a chrome careproduct tested and approved by Mercedes-Benz.
Impurities combined with the effects of roadgrit and corrosive environmental factors maycause flash rust to form on the surface. Youcan restore the original shine of the exhaustpipe by cleaning it regularly, especially in win-ter and after washing.
Care275
Maintenance and care
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