2019 MERCEDES-BENZ SL CLASS ECU
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Display messagesPossible causes/consequences and P PSolutions
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Stop Vehicle SeeStop Vehicle SeeOperator's ManualOperator's Manual
The battery is no longer being charged and the condition of chargeis too low.
A warning tone also sounds.
XPull over and stop the vehicle safely and switch off the engine,paying attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XObserve the instructions in the =See Operator's ManualSee Operator's Manualdisplay message.
XConsult a qualified specialist workshop.
Page 225 of 330
Display messagesPossible causes/consequences and P PSolutions
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 yellow cindicator 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 yellow cindicator lamps also light up in the exterior mirrors.
XVisit a qualified specialist workshop.
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On-b oard computer and displays
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Display messagesPossible causes/consequences and P PSolutions
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).
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On-board computer and displays
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Display messagesPossible causes/consequences and P PSolutions
Active SteeringActive SteeringAssist CurrentlyAssist CurrentlyUnavailable SeeUnavailable SeeOperator's ManualOperator's Manual
Active Steering Assist is temporarily inoperative.
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 Steering 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 SteeringActive SteeringAssist InoperativeAssist InoperativeActive Steering Assist is faulty.
However, the Active Distance Assist DISTRONIC functions are stillavailable.
A warning tone also sounds.
XVisit a qualified specialist workshop.
Cruise Control OffCruise Control OffCruise control has been deactivated.
If a warning tone also sounds, cruise control has deactivated auto-matically (Ypage 154).
Cruise Control - -Cruise Control - -- mph- mphCruise control cannot be activated, since not all of the activationconditions have been met.
XCheck the activation conditions for cruise control (Ypage 154).
Cruise ControlCruise ControlInoperativeInoperativeCruise control is malfunctioning.
A warning tone also sounds.
XVisit a qualified specialist workshop.
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On-b oard computer and displays
Page 229 of 330
Tires
Display messagesPossible causes/consequences and P PSolutions
Please CorrectPlease CorrectTire PressureTire PressureThe tire pressure is too low in at least one of the tires, or the tirepressure difference between the wheels is too great.
XCheck the tire pressures at the next opportunity (Ypage 299).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 301).
Tire Pressure SoonTire Pressure SoonThe tire pressure in one or more tires has dropped significantly. Thewheel position is shown in the multifunction display.
A warning tone also sounds.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase
Rthey may wear excessively and/or unevenly, which may greatlyimpair tire traction.
Rthe driving characteristics, as well as steering and braking, maybe greatly impaired
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 146).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 278).
XCheck the tire pressure (Ypage 299).
XIf necessary, correct the tire pressure.
Warning Tire Mal‐Warning Tire Mal‐functionfunctionThe tire pressure in one or more tires has dropped suddenly. Thewheel position is shown in the multifunction display.
GWARNING
Driving with a flat tire poses a risk of the following hazards:
Ra flat tire affects the ability to steer or brake the vehicle
Ryou could lose control of the vehicle.
Rcontinued driving with a flat tire will cause excessive heat build-up and possibly a fire
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 146).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 278).
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On-b oard computer and displays
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Display messagesPossible causes/consequences and P PSolutions
Only Select ParkOnly Select Park(P) When Vehicle(P) When Vehicleis Stationaryis Stationary
The vehicle is moving.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XShift the transmission to position ].
Apply Brake toApply Brake toSelect RSelect RYou have attempted to shift from position [to position ^.
XDepress the brake pedal.
XShift the transmission to position ^.
Service RequiredService RequiredDo Not Shift GearsDo Not Shift GearsVisit DealerVisit Dealer
You cannot change the transmission position due to a malfunction.
A warning tone also sounds.
If transmission position [is selected:
XDrive to a qualified specialist workshop without shifting the trans-mission from position [.
If position ^, \\or ]is selected:
XNotify a qualified specialist workshop or breakdown service.
Reversing Not Pos‐Reversing Not Pos‐sible Servicesible ServiceRequiredRequired
You can no longer shift to transmission position ^due to a mal-function.
Transmission positions ], \\or [continue to be available.
A warning tone also sounds.
XVisit a qualified specialist workshop.
Transmission Mal‐Transmission Mal‐function Stopfunction StopA malfunction has occurred in the mechanical transmission compo-nents.
A warning tone also sounds. The transmission shifts automaticallyto position \\.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XShift the transmission to position ].
XSecure the vehicle against rolling away (Ypage 146).
XNotify a qualified specialist workshop or breakdown service.
Stop Vehicle LeaveStop Vehicle LeaveEngine RunningEngine RunningWait TransmissionWait TransmissionCoolingCooling
The transmission has overheated. Pulling away can be temporarilyimpaired or not possible.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions. Do not continue drivingunder any circumstances.
XWait until the display message disappears before pulling away.
Auxiliary BatteryAuxiliary BatteryMalfunctionMalfunctionThe auxiliary battery for the automatic transmission is no longerbeing charged.
XVisit a qualified specialist workshop at the next opportunity.
XUntil then, always shift the transmission to position ]beforeyou switch off the engine.
XBefore leaving the vehicle, apply the electric parking brake.
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Safety systems
Warning/indicatorlamp
Q QSignal type
Possible causes/consequences and P PSolutions
' M Q '(USA only), M(Canada only): the red brake system warning lamp islit while the engine is running.
A warning tone also sounds.
GWARNING
The brake boosting effect is malfunctioning and the braking characteristics maybe affected.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention toroad and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 146).
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
' M Q '(USA only) or M(Canada only): the red brake system warning lampis lit while the engine is running. A warning tone also sounds.
GWARNING
There is not enough brake fluid in the brake fluid reservoir.
The braking effect may be impaired.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention toroad and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 146).
XDo not add brake fluid. Adding more will not correct the malfunction.
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
' QUSA only: the red brake system warning lamp is lit while the engine is run-ning. The multifunction display also shows a display message with the &symbol.
The brake pads/linings have reached their wear limit.
XVisit a qualified specialist workshop.
Warning and indicator lamps235
On-board computer and displays
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Tires
Warning/indicatorlamp
Q QSignal type
Possible causes/consequences and P PSolutions
w QThe yellow tire pressure monitor warning lamp (pressure loss/malfunction) islit.
The tire pressure monitor has detected a loss of pressure in at least one of thetires.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase
Rthey may wear excessively and/or unevenly, which may greatly impair tiretraction.
Rthe driving characteristics, as well as steering and braking, may be greatlyimpaired
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking maneuvers.Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 146).
XObserve the additional display messages in the multifunction display.
XCheck the tires and, if necessary, follow the instructions for a flat tire(Ypage 278).
XCheck the tire pressure (Ypage 299).
XIf necessary, correct the tire pressure.
w QThe yellow tire pressure monitor warning lamp (pressure loss/malfunction)flashes for approximately one minute and then remains lit.
The tire pressure monitor is faulty.
GWARNING
The system is possibly unable to recognize or register low tire pressure.
There is a risk of an accident.
XObserve the additional display messages in the multifunction display.
XVisit a qualified specialist workshop immediately.
242Warning and indicator lamps
On-board computer and displays