warning lights MERCEDES-BENZ GLC 2019 Owner's Guide

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.
In addition, the'(USA only) orM(Canada only) warning lamplights 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 152).
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.
USA only: the red'brake system warning lamp is lit while theengine is running.
GWARNING
If the brake pads/linings have reached their wear limit, braking per-formance may be impaired.
There is a risk of an accident.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
S
InoperativeInoperative
One or more main features of the mbrace system are malfunctioning.
XVisit a qualified specialist workshop.
Displaymessages233
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
ActiveActiveBrakeBrakeAssistAssistFunctions LimitedFunctions LimitedSee Operator's Man‐See Operator's Man‐ualual
Active Brake Assist with cross-traffic function is unavailable due to amalfunction.
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 Lane Keeping Assist
RActive Blind Spot Assist
RActive Distance Assist DISTRONIC with Active Steering Assist
If the radar sensor system in front is dirty, Active Blind Spot Assist willnot 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 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 152).
XSwitch off the engine.
XClean all sensors (Ypage 309).
XRestart the engine.The display message disappears.
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 43).
Displaymessages235
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
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
RearRearCenterCenterMalfunc‐Malfunc‐tion Servicetion ServiceRequiredRequired
The rear center restraint system is malfunctioning. Theuwarninglamp 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.
236Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
Further information about the Occupant Classification System(Ypage 51).
Lights
Display messagesPossible causes/consequences andPPSolutions
I
CheckCheckLeftLeftLowLowBeamBeam(Example)
The corresponding bulb is faulty.
XVisit a qualified specialist workshop.
or
XCheck whether you are permitted to replace the bulb yourself(Ypage 114).
iLED light sources: the display message for the correspondinglamp only appears when all the LEDs in the lamp have failed.
I
Active HeadlampsActive HeadlampsInoperativeInoperative
The active light function is malfunctioning.
XVisit a qualified specialist workshop.
I
Malfunction SeeMalfunction SeeOperator’s ManualOperator’s Manual
The exterior lighting is malfunctioning.
XVisit a qualified specialist workshop.
Vehicles with trailer tow hitch: a fuse may have blown.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 152).
XCheck the fuses (Ypage 327).
XIf necessary, replace the blown fuse. Observe the warning notes.
If the display message remains on show:
XVisit a qualified specialist workshop.
I
Automatic HeadlampAutomatic HeadlampMode InoperativeMode Inoperative
The light sensor is malfunctioning.
XVisit a qualified specialist workshop.
I
Switch Off LightsSwitch Off Lights
You leave the vehicle and the lights are switched on. A warning tonealso 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.
Displaymessages239
On-b oard computer and displays
Z

Safety systems
Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions
'MQ'(USA only),M(Canada only): the red brake system warning lamp is litwhile the engine is running.
A warning tone also sounds.
GWARNING
The brake boosting effect is malfunctioning and the braking characteristics may beaffected.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to roadand traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 152).
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
'MQ'(USA only),M(Canada only): the red brake system warning lamp lightsup while the engine is running.
A warning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
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, paying attention to roadand traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 152).
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 running.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.
258Warning and indicator lamps in the instrument cluster
On-board computer and displays

General notes
The multimedia system section in this Opera-tor's Manual describes the basic principles foroperation. More information can be found in theDigital Operator's Manual.
Important safety notes
GWARNING
If you operate information systems and com-
munication equipment integrated in the vehi-
cle when driving, you may be distracted from
the traffic situation. You could also lose con-
trol of the vehicle. There is a risk of an acci-
dent.
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 equip-
ment when the vehicle is stationary.
You must observe the legal requirements for thecountry in which you are currently driving whenoperating the multimedia system.
The multimedia system calculates the route tothe destination without taking the following intoaccount, for example:
Rtraffic lights
Rstop and yield signs
Rparking or stopping restrictions
Rroad narrowing
Rother road and traffic rules and regulations
The multimedia system may give incorrect nav-igation recommendations if the actual street/traffic situation does not correspond with thedigital map's data.
For example:
Ra diverted route
Rthe road layout or the direction of a one-waystreet has been changed
For this reason, you must always observe roadand traffic rules and regulations during yourjourney. Road and traffic rules and regulationsalways have priority over multimedia systemdriving recommendations.
Navigation announcements are intended todirect you while driving without diverting yourattention from the road and driving.
Please always use this feature instead of con-sulting the map display for directions. Lookingat the icons or map display can distract you fromtraffic conditions and driving, and increase therisk of an accident.
This equipment complies with FCC radiationexposure limits set forth for uncontrolled equip-ment and meets the FCC radio frequency (RF)Exposure Guidelines in Supplement C to OET65.
This equipment has very low levels of RF energythat is deemed to comply without maximumpermissive exposure evaluation (MPE). How-ever, it is recommended to install it at a distanceof at least 8 inches (approx. 20 cm) between theradiation source and a person's body (notincluding limbs such as hands, wrists, feet andlegs).
GWARNING
Modifications to electronic components, their
software as well as wiring can impair their
function and/or the function of other net-
worked components. In particular, systems
relevant to safety could also be affected. As a
result, these may no longer function as inten-
ded and/or jeopardize the operating safety of
the vehicle. There is an increased risk of an
accident and injury.
Never tamper with the wiring as well as elec-
tronic components or their software. You
should have all work to electrical and elec-
tronic equipment carried out at a qualified
specialist workshop.
Function restrictions
For safety reasons, some functions are restric-ted or unavailable while the vehicle is in motion.You will notice this, for example, because eitheryou will not be able to select certain menu itemsor a message will appear to this effect.
268Function restrictions
Multimedia system

Information on the message display can befound in the "Checking the tire pressure elec-tronically" section (Ypage 339).
Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once every two
weeks when cold and inflated to the pressure
recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillar or the tire pres-
sure label on the inside of the fuel filler flap. If
your vehicle has tires of a different size than
the size indicated on the Tire and Loading
Information placard or, if available, the tire
pressure label, you should determine the
proper tire pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pres-
sure telltale when one or more of your tires
are significantly underinflated. Accordingly,
when the low tire pressure telltale lights up,
you should stop and check your tires as soon
as possible, and inflate them to the proper
pressure. Driving on a significantly underin-
flated tire causes the tire to overheat and can
lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that
the TPMS is not a substitute for proper tire
maintenance, and it is the driver's responsi-
bility to maintain correct tire pressure, even if
underinflation has not reached the level to
trigger illumination of the TPMS low tire pres-
sure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the sys-
tem detects a malfunction, the warning lamp
will flash for approximately a minute and then
remain continuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists. When the malfunction indicator is illu-
minated, the system may not be able to detect
or signal low tire pressure as intended.
TPMS malfunctions may occur for a variety of
reasons, including the installation of incom-
patible replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioning properly. Always check the
TPMS malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate Tires
and wheels allow the TPMS to continue to
function properly.
It is the driver's responsibility to set the tirepressure to that recommended for cold tireswhich is suitable for the operating situation(Ypage 333). Note that the correct tire pressurefor the current operating situation must first betaught-in to the tire pressure monitor. If a sub-stantial loss of pressure occurs, the warningthreshold for the warning message is aligned tothe taught-in reference values. Restart the tirepressure monitor after adjusting the pressure ofthe cold tires (Ypage 339). The current pres-sures are saved as new reference values. As aresult, a warning message will appear if the tirepressure drops significantly.
The tire pressure monitor does not warn you ofan incorrectly set tire pressure. Observe thenotes on the recommended tire pressure(Ypage 333).
The tire pressure monitor is not able to warn youof a sudden loss of pressure, e.g. if the tire ispenetrated by a foreign object. In the event of asudden loss of pressure, bring the vehicle to ahalt by braking carefully. Avoid abrupt steeringmovements.
The tire pressure monitor has a yellow warninglamp in the instrument cluster for indicatingpressure loss or a malfunction. Whether thewarning lamp flashes or lights up indicateswhether a tire pressure is too low or the tirepressure monitor is malfunctioning:
Rif the warning lamp is lit continuously, the tirepressure on one or more tires is significantly
338Tire pressure
Wheels and tires