2019 MERCEDES-BENZ CLA Owners Manual

Display messagesPossible causes/consequences andPPSolutions
The yellow$warning lamp lights up and the redI(USA only)or$(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.
A warning tone sounds. The'(USA only) orM(Canada only)warning lamps in the instrument cluster may also light up.
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 142).
XConsult a qualified specialist workshop.
XDo not add brake fluid. This does not correct the malfunction.
&
CheckCheckBrakeBrakePadPadWearWear
The brake pads/linings have reached their wear limit.
XVisit a qualified specialist workshop.
S
InoperativeInoperative
Malfunction of one or more main functions of the Mercedes me con-nect system.
XVisit a qualified specialist workshop.
MercedesMercedesmemeconnectconnectServices LimitedServices LimitedSee Operator's Man‐See Operator's Man‐ualual
Service limited.
Malfunction of one or more main functions of the Mercedes me con-nect system.
XObserve the notes on diagnostics connection (Ypage 28).
XVisit a qualified specialist workshop.
Displaymessages199
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
ActiveActiveBrakeBrakeAssistAssistFunctionsFunctionsCurrentlyCurrentlyLimited See Opera‐Limited See Opera‐tor's Manualtor's Manual
Active Brake Assist is temporarily inoperative.
Possible causes are:
Rthe radar sensor system is temporarily inoperative, e.g. due to elec-tromagnetic radiation emitted by nearby TV or radio stations orother 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 142).
XRestart the engine.
Active BrakeActive BrakeAssist:Assist:SystemSystemInop‐Inop‐erativeerative
Active Brake Assist is unavailable due to a malfunction. Situation-dependent braking assistance may also have failed.
XVisit a qualified specialist workshop immediately.
RadarRadarSensorsSensorsDirtyDirtySee Operator's Man‐See Operator's Man‐ualual
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 malfunctioningor is temporarily unavailable:
RActive Brake Assist
RActive Distance Assist DISTRONIC
A warning tone also sounds.
Once the cause of the problem is no longer present, the driving anddrive safety systems will be available again. The display message dis-appears.
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 142).
XSwitch off the engine.
XClean all sensors (Ypage 269).
XRestart the engine.The display message disappears.
200Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
u
SRSSRSMalfunctionMalfunctionSer‐Ser‐vice Requiredvice Required
The restraint system is malfunctioning. Theuwarning lamp alsolights up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be triggeredunintentionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
Further information about the restraint system (Ypage 40).
u
Front Left Malfunc‐Front Left Malfunc‐tion Servicetion ServiceRequiredRequiredorFrontFrontRight MalfunctionRight MalfunctionService RequiredService Required
The restraint system is malfunctioning at the front on the left or right.Theuwarning lamp also lights up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be triggeredunintentionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
u
Rear Left Malfunc‐Rear Left Malfunc‐tion Servicetion ServiceRequiredRequiredorRearRearRight MalfunctionRight MalfunctionService RequiredService Required
The rear left-hand or right-hand restraint system is malfunctioning.Theuwarning lamp also lights up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be triggeredunintentionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
u
Left Side CurtainLeft Side CurtainAirbag MalfunctionAirbag MalfunctionService RequiredService RequiredorRight Side CurtainRight Side CurtainAirbag MalfunctionAirbag MalfunctionService RequiredService Required
The left-hand or right-hand window curtain air bag is malfunctioning.Theuwarning lamp also lights up in the instrument cluster.
GWARNING
The left or right window curtain air bag may either be triggered unin-tentionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop immediately.
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On-b oard computer and displays
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Display messagesPossible causes/consequences andPPSolutions
FrontFrontPassengerPassengerAir‐Air‐bag Disabled Seebag Disabled SeeOperator's ManualOperator's Manual
The front-passenger air bag and front-passenger knee bag are deac-tivated during the journey, although:
Ran adult
or
Ra person of the corresponding stature is on the front-passenger seat
If additional forces are applied to the seat, the system may interpretthe occupant's weight as lower than it actually is.
GWARNING
The front-passenger front air bag and front passenger knee bag maynot be triggered in the event of an accident.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XSwitch the ignition off.
XHave the occupant on the front-passenger seat get out of the vehi-cle.
XKeep the seat unoccupied, close the front-passenger door andswitch on the ignition.
XObserve the PASSENGER AIR BAG indicator lamps in the centerconsole and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
Ra self-diagnosis is carried out. The PASSENGER AIR BAG OFF andPASSENGER AIR BAG ON indicator lamps must light up simulta-neously for approximately six seconds.
Rthe PASSENGER AIR BAG OFF indicator lamp must then light upand remain lit after the self-diagnosis. If the indicator lamp is on,OCS (Occupant Classification System) has deactivated the front-passenger front air bag and front-passenger knee bag(Ypage 48)
RtheFront Passenger Airbag Enabled See Operator'sFront Passenger Airbag Enabled See Operator'sManualManualorFront Passenger Airbag Disabled See Opera‐Front Passenger Airbag Disabled See Opera‐tor'stor'sManualManualdisplay messages must not be shown on the mul-tifunction display
XWait for a period of at least 60 seconds until the necessary systemchecks have been completed.
XMake sure that the display messages do not appear in the multi-function display.
If these conditions are fulfilled, the front-passenger seat can be occu-pied again. Whether the PASSENGER AIR BAG OFF or ON indicatorlamp remains lit or goes out depends on how OCS classifies the occu-pant.
If the conditions are not fulfilled, the system is not operating correctly.
XVisit a qualified specialist workshop immediately.
Further information about the Occupant Classification System(Ypage 48).
202Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
FrontFrontPassengerPassengerAir‐Air‐bag Enabled Seebag Enabled SeeOperator's ManualOperator's Manual
The front-passenger air bag and front-passenger knee bag are enabledduring the journey, even though:
Ra child, a small adult or an object weighing less than the system'sweight threshold is located on the front-passenger seat
or
Rthe front-passenger seat is unoccupied
The system may detect objects or forces applying additional weight onthe seat.
GWARNING
The front-passenger front air bag and front-passenger knee bag maybe triggered unintentionally.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XSwitch the ignition off.
XOpen the front-passenger door.
XRemove the child and the child restraint system from the front-passenger seat.
XMake sure that there are no objects on the seat adding to theweight.The system might otherwise detect the additional weight and inter-pret the seat occupant's weight as greater than it actually is.
XKeep the seat unoccupied, close the front-passenger door andswitch on the ignition.
XObserve the PASSENGER AIR BAG indicator lamps in the centerconsole and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
Ra self-diagnosis is carried out. The PASSENGER AIR BAG OFF andPASSENGER AIR BAG ON indicator lamps must light up simulta-neously for approximately six seconds.
Rthe PASSENGER AIR BAG OFF indicator lamp must then light upand remain lit after the self-diagnosis. If the indicator lamp is on,OCS has deactivated the front-passenger front air bag and front-passenger knee air bag (Ypage 48)
RtheFront Passenger Airbag Enabled See Operator'sFront Passenger Airbag Enabled See Operator'sManualManualorFront Passenger Airbag Disabled See Opera‐Front Passenger Airbag Disabled See Opera‐tor'stor'sManualManualdisplay messages must not be shown on the mul-tifunction display
XWait for a period of at least 60 seconds until the necessary systemchecks have been completed.
XMake sure that the display messages do not appear in the multi-function display.
If these conditions are fulfilled, the front-passenger seat can be occu-pied again. Whether the PASSENGER AIR BAG OFF or ON indicatorlamp remains lit or goes out depends on how OCS classifies the occu-pant.
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Display messagesPossible causes/consequences andPPSolutions
If the conditions are not fulfilled, the system is not operating correctly.
XVisit a qualified specialist workshop immediately.
Further information about the Occupant Classification System(Ypage 48).
Lights
iVehicles with LED bulbs in the light clusters:
The display message for the corresponding lamp only appears when all of the LEDs in the lamphave failed.
Display messagesPossible causes/consequences andPPSolutions
I
Check Left Corner‐Check Left Corner‐ing Lighting LightorCheckCheckRight CorneringRight CorneringLightLight
The left or right-hand cornering light is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
CheckCheckLeftLeftLowLowBeamBeamorCheck Right LowCheck Right LowBeamBeam
The left or right-hand low-beam headlamp is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
Check Rear LeftCheck Rear LeftTurn SignalTurn SignalorCheck Rear RightCheck Rear RightTurn SignalTurn Signal
The rear left-hand or rear right-hand turn signal is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
Check Front LeftCheck Front LeftTurn SignalTurn SignalorCheck Front RightCheck Front RightTurn SignalTurn Signal
The front left-hand or front right-hand turn signal is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
Check Left MirrorCheck Left MirrorTurn SignalTurn SignalorCheck Right MirrorCheck Right MirrorTurn SignalTurn Signal
The turn signal in the left-hand or right-hand exterior mirror is defec-tive.
XVisit a qualified specialist workshop.
I
Check Center BrakeCheck Center BrakeLampLamp
The high-mounted brake lamp is faulty.
XVisit a qualified specialist workshop.
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Display messagesPossible causes/consequences andPPSolutions
I
Check Left BrakeCheck Left BrakeLampLamporCheck RightCheck RightBrake LampBrake Lamp
The left or right-hand brake lamp is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
CheckCheckLeftLeftTailTailandandBrake LampsBrake LampsorCheck Right TailCheck Right Tailand Brake Lampsand Brake Lamps
The left or right-hand tail lamp/brake lamp is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
CheckCheckLeftLeftHighHighBeamBeamorCheck RightCheck RightHigh BeamHigh Beam
The left or right-hand high beam is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
License Plate LampLicense Plate Lamp
The left or right-hand license plate lamp is faulty.
XVisit a qualified specialist workshop.
I
Rear Fog LampRear Fog Lamp
The rear fog lamp is faulty.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
Check Front LeftCheck Front LeftParking LampParking LamporCheck Front RightCheck Front RightParking LampParking Lamp
The front left or front right parking or standing lamp is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
Backup LightBackup Light
The backup lamp is defective.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
XVisit a qualified specialist workshop.
I
Check Left TailCheck Left TailLampLamporCheck RightCheck RightTail LampTail Lamp
The left or right-hand tail lamp is defective.
XVisit a qualified specialist workshop.
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Display messagesPossible causes/consequences andPPSolutions
I
Check Front LeftCheck Front LeftSidemarker LampSidemarker LamporCheck Front RightCheck Front RightSidemarker LampSidemarker Lamp
The front left-hand or front right-hand side marker lamp is faulty.
XVisit a qualified specialist workshop.
I
Check Rear LeftCheck Rear LeftSidemarker LampSidemarker LamporCheck Rear RightCheck Rear RightSidemarker LampSidemarker Lamp
The rear left-hand or rear right-hand side marker lamp is faulty.
XVisit a qualified specialist workshop.
I
Check Left DaytimeCheck Left DaytimeRunning LightRunning LightorCheckCheckRightRightDaytimeDaytimeRunning LightRunning Light
The left or right-hand daytime running lamp is faulty.
XCheck whether you are permitted to replace the bulb yourself(Ypage 105).
or
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 warningtone also sounds.
XTurn the light switch to theXposition.
I
Switch On HeadlampsSwitch On Headlamps
You are driving with low-beam headlamps switched off.
XTurn the light switch to theXorXposition.
Adaptive HighbeamAdaptive HighbeamAssist CurrentlyAssist CurrentlyUnavailable SeeUnavailable SeeOperator's ManualOperator's Manual
Adaptive Highbeam Assist is deactivated and 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.
XClean the windshield.
If the system detects that the camera is fully operational again, theAdaptiveAdaptiveHighbeamHighbeamAssistAssistNowNowAvailableAvailablemessage is displayed.
Adaptive Highbeam Assist is operational again.
Adaptive HighbeamAdaptive HighbeamAssist InoperativeAssist InoperativeAdaptive Highbeam Assist is faulty.
XVisit a qualified specialist workshop.
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