2019 MERCEDES-BENZ GLC check engine light

This helps you to avoid overheating thebrakes and wearing them out excessively.
When you take advantage of engine braking, adrive wheel may not turn for some time, e.g.on a slippery road surface. This could causedamage to the drive train. This type of damageis not covered by the Mercedes-Benz war-ranty.
Heavy and light loads
GWARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. 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. Driveon for a short while. This allows the airflow tocool 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 firsttime. This may also occur after the vehicle hasbeen washed or driven through deep water.
You have to depress the brake pedal morefirmly. Maintain a greater distance from thevehicle in front.
After driving on a wet road or having the vehiclewashed, brake firmly while paying attention tothe 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, apply thebrakes occasionally while paying attention tothe 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 engine isrunning
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 immediately.Consult a qualified specialist workshop toarrange this.
!Vehicles with 4MATIC:function or per-formance tests may only be carried out on a 2-axle dynamometer. If you wish to operate thevehicle on such a dynamometer, please con-sult a qualified specialist workshop inadvance. You could otherwise damage thedrive train or the brake system.
!Vehicles with 4MATIC:the ESP®systemoperates automatically. If the electric parkingbrake is tested on a brake dynamometer, theengine and ignition must be switched off: turnthe SmartKey in the ignition lock to position

Rif there is a sudden change in temperature,e.g. when driving into a heated garage in win-ter
Rif the camera lens is dirty or obstructed.Observe the notes on cleaning(Ypage 309)
Rif the rear of your vehicle is damaged. In thiscase, have the camera position and settingchecked at a qualified specialist workshop
The field of vision and other functions of the rearview camera may be restricted due to additionalaccessories on the rear of the vehicle (e.g.license plate holder, rear bicycle rack).
The rear view camera is protected from rain-drops and dust by means of a flap. When the rearview camera is activated, this flap opens.
The flap closes again when:
Ryou have finished the maneuvering process
Ryou switch off the engine
Ryou open the cargo compartment
Observe the notes on cleaning (Ypage 309).
For technical reasons, the flap may remain openbriefly after the rear view camera has beendeactivated.
Activating/deactivating the rear view
camera
XTo activate:make sure that theActiva‐Activa‐
tion by R geartion by R gearfunction is selected in themultimedia system (see the Digital Operator'sManual).
XEngage reverse gear.The rear view camera flap opens. The multi-media system shows the area behind the vehi-cle with guide lines.
The image from the rear view camera is avail-able throughout the maneuvering process.
XTo switch the function mode for vehicleswith trailer tow hitch:using the controller,select symbolCfor the "Reverse parking"function or symbolDfor "Coupling up atrailer".The symbol of the selected function is high-lighted.
XTo deactivate:shift the transmission to posi-tion].
or
XDrive forwards at a speed greater than 7 mph(12 km/h).
Multimedia display
The rear view camera may show a distorted viewof obstacles, show them incorrectly or not at all.The rear view camera does not show objects inthe following positions:
Rvery close to the rear bumper
Runder the rear bumper
Rin the area immediately above the tailgatehandle
!Objects not at ground level may appear tobe further away than they actually are, e.g.:
Rthe bumper of a parked vehicle
Rthe drawbar of a trailer
Rthe ball coupling of a trailer tow hitch
Rthe rear section of an HGV
Ra slanted post
Use the guidelines only for orientation.Approach objects no further than the bottom-most guideline.
Driving systems183
Driving and parking
Z

Warning lamp
CWarning lamp
Blind Spot Assist is not active at speeds belowapproximately 20 mph (30 km/h). Vehicles inthe monitoring range are then not indicated.
If a vehicle is detected within the blind spotmonitoring range at speeds above 20 mph(30 km/h), warning lampCon the correspond-ing side lights up red. This warning is alwaysemitted when a vehicle enters the blind spotmonitoring range from behind or from the side.When you overtake a vehicle, the warning onlyoccurs if the difference in speed is less than7 mph (12 km/h).
If you select the reverse gear, Blind Spot Assistis not operational.
The brightness of the warning lamps is auto-matically adapted to the brightness of the sur-roundings.
Collision warning
If a vehicle is detected in the monitoring range ofBlind Spot Assist and you switch on the corre-sponding turn signal, a double warning tonesounds. The red warning lamp flashes on therelevant exterior mirror. If the turn signalremains on, detected vehicles are indicated bythe flashing of the red warning lamp on the exte-rior mirror. No further warning tone sounds.
Activating Blind Spot Assist
XMake sure that Blind Spot Assist is activatedin the on-board computer (Ypage 220).
XTurn the SmartKey to positionHin the igni-tion lock.The red warning lamps on the exterior mirrorslight up until the engine is started.
Display in the assistance graphic
When Blind Spot Assist is activated, gray radarwaves propagating backwards appear next tothe vehicle in the assistance display in the mul-tifunction display (Ypage 219). Above a speedof 20 mph (30 km/h), the color of the radarwaves in the assistance graphic changes togreenC. Blind Spot Assist is then ready for use.
Towing a trailer
When you attach a trailer, make sure you havecorrectly established the electrical connection.This can be accomplished by checking the trailerlighting. In this event, Blind Spot Assist is deac-tivated. TheBlindBlindSpotSpotAssistAssistNotNotAvail‐Avail‐able When Towing a Trailer See Opera‐able When Towing a Trailer See Opera‐tor's Manualtor's Manualmessage appears in the multi-function display.
Lane Keeping Assist
General notes
Lane Keeping Assist monitors the area in front ofyour vehicle by means of multifunction cam-eraCwhich is attached behind the top of thewindshield. Lane Keeping Assist detects lanemarkings on the road and can warn you beforeyou leave your lane unintentionally.
Driving systems195
Driving and parking
Z

the lines on the assistance graphic display areshown in green (Ypage 219). Active LaneKeeping Assist is ready for use.
XTo deactivate:press buttonD.Indicator lampCgoes out. The Active LaneKeeping Assist is deactivated. TheLaneLaneKeeping Assist OffKeeping Assist Offmessage appears inthe multifunction display.
Selecting Standard or Adaptive setting
XIn theDriveAssistDriveAssistmenu on the on-boardcomputer, select theActive Lane Keep‐Active Lane Keep‐ing Assisting Assistfunction (Ypage 221).
XSelect settingStandardStandardorAdaptiveAdaptive.WhenStandardStandardis selected, no warning vibra-tion occurs if:
Ryou switch on the turn signals. In this event,the warnings are suppressed for a certainperiod of time.
Ra driving safety system intervenes, such as
ABS, BAS or ESP®.
WhenAdaptiveAdaptiveis selected, no warning vibra-tion occurs if:
Ryou switch on the turn signals. In this event,the warnings are suppressed for a certainperiod of time.
Ra driving safety system intervenes, e.g.
ABS, BAS or ESP®.
Ryou accelerate hard, e.g. kickdown.
Ryou brake hard.
Ryou steer actively, e.g. swerve to avoid anobstacle or change lanes quickly.
Ryou cut the corner on a sharp bend.
To ensure that you are warned only when nec-essary and in good time if you cross the lanemarkings, the system detects certain conditionsand warns you accordingly.
The warning vibration occurs earlier if:
Ryou approach the outer lane marking on abend
Rthe road has very wide lanes, e.g. a freeway
Rthe system detects solid lane markings
The warning vibration occurs later if:
Rthe road has narrow lanes
Ryou cut the corner on a bend
Towing a trailer
When you attach a trailer, make sure you havecorrectly established the electrical connection.
This can be accomplished by checking the trailerlighting.
Towing a trailer
Important safety notes
GWARNING
Installing an unsuitable ball coupling may
result in overloading of the trailer tow hitch
and the rear axle. This applies especially if the
ball coupling in question is longer or angled
differently. This could seriously impair the
driving characteristics and the trailer can
come loose. There is a risk of an accident.
You should only ever install a ball coupling
that has the permissible dimensions and that
is designed to meet your trailer-towing
requirements. Do not modify the ball coupling
or the trailer tow hitch.
You will find the values approved by the manu-facturer on the vehicle identification plates andthose for the towing vehicle under "Technicaldata" (Ypage 364).
GWARNING
When the vehicle/trailer combination begins
to lurch, you could lose control of it. The vehi-
cle/trailer combination could even rollover.
There is a risk of an accident.
On no account should you attempt to
straighten up the vehicle/trailer combination
by increasing the speed. Reduce vehicle
speed and do not countersteer. Apply the
brake as necessary.
!If you have a trailer tow hitch retrofitted,changes to the engine cooling system may benecessary, depending on the vehicle type.
If you have a trailer tow hitch retrofitted,observe the anchorage points on the chassisframe.
The installation of a trailer tow hitch is only per-missible if a towing weight is specified in yourvehicle documents. If this is not the case, thenthe vehicle is not approved for the towing of atrailer.
202Towing a trailer
Driving an d parking

XSwitch off the engine.
XClose the doors and tailgate.
XCouple up the trailer.
XEstablish the electrical connection betweenthe vehicle and the trailer.
XCheck that the trailer lighting system is work-ing.
XPush the combination switch upwards/down-wards and check whether the correspondingturn signal on the trailer flashes.
A trailer that is connected is recognized onlywhen the electrical connection is establishedcorrectly and when the lighting system is work-ing properly. The function of other systems alsodepends on this, for example:
RESP®
RPARKTRONIC
RActive Parking Assist
RActive Blind Spot Assist
RActive Lane Keeping Assist
Vehicles with AIR BODY CONTROL: if you coupleup a trailer, the vehicle always remains at high-way level. Observe the following note when cou-pling up a trailer:
RUnless highway level has been set manually,the vehicle is automatically lowered to high-way level. If a speed of 5 mph (8 km/h) hasbeen reached, this may be the case.
These restrictions apply to accessories that aresupplied with power via the trailer socket in yourvehicle, e.g. a rear bicycle rack.
Observe the maximum permissible trailerdimensions (width and length).
Most U.S. states and all Canadian provincesrequire by law:
RSafety chains between the towing vehicle andthe trailer. The chains should be cross-woundunder the trailer drawbar. They must be fas-tened to the vehicle's trailer coupling, not tothe bumper or the axle.
Leave enough play in the chains to make tightcornering possible.
RA separate brake system for certain types oftrailer.
RSafety switch for braked trailers. Check thespecific legal requirements applicable to yourstate.
If the trailer becomes detached from the tow-ing vehicle, the safety feature applies thetrailer brakes.
Towing a trailer
There are several legal requirements for towinga trailer, e.g. the maximum permissible speed.Make sure that your car/trailer combinationcomplies with the local regulations:
Rin your place of residence
Rat your destination
The police and local authorities can provide reli-able information.
To accumulate driving experience and accustomyourself to the new handling characteristics,practice the following at a location where thereis no traffic:
RCornering
RStopping
RBacking up
Check the following before the journey:
RTrailer tow hitch
RSafety switch for braked trailers
RSafety chains
RElectrical connections
RLighting system
RWheels and tires
RLoad securing
Adjust the exterior mirrors so that you have aclear view of the rear section of the trailer.
If the trailer is equipped with electronically con-trolled brakes, pull away carefully in the car/trailer combination. Brake manually using thebrake controller and check whether the brakesfunction correctly.
Regularly check that the load is secure.
When towing a trailer, your vehicle's handlingcharacteristics will be different in comparisonwith when driving without a trailer.
The vehicle/trailer combination:
Ris heavier
Ris restricted in its acceleration and gradient-climbing capability
Rhas an increased braking distance
Ris affected more by strong crosswinds
Rdemands more sensitive steering
Rhas a larger turning circle
Avoid sudden steering movements.
Avoid braking abruptly. If possible, brake gentlyat first to allow the trailer to run on. Then,increase the braking force rapidly.
Towing a trailer205
Driving and parking
Z

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

XReach into the gap, pull hood catch handleDup and lift the hood.
If you lift the hood by approximately 15 in(40 cm), the hood is opened and held openautomatically by the gas-filled strut.
Closing the hood
XLower the hood and let it fall from a height ofapproximately 8 in (20 cm).
XCheck that the hood has engaged properly.If the hood can be raised slightly, it is notproperly engaged. Open it again and close itwith a little more force.
Radiator
Do not cover up the radiator, such as with athermal mat or insect protection cover. Other-wise, the values of the European on-board diag-nostics may be affected. Some of these read-ings are required by law and must be accurate atall times.
Engine oil
Important safety notes
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
GWARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is a risk of injury.
If you need to do any work inside the engine
compartment:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
GWARNING
If engine oil comes into contact with hot com-
ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next to
the filler neck. Let the engine cool down and
thoroughly clean the engine oil off the com-
ponents before starting the engine.
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
General notes
Depending on your driving style, the vehicleconsumes up to 0.9 US qt (0.8 l) of oil per600 miles(1,000 km). The oil consumption maybe higher than this when the vehicle is new or ifyou frequently drive at high engine speeds.
Depending on the engine, the oil dipstick may bein a different location.
300Engine compartment
Maintenance and care

chrome trims must not be polished with achrome polish as this will cause them to losetheir black shine. For optimal care, the face-plates should be rubbed with a lightly oiledcloth after every car wash. Commerciallyavailable engine and care oils are suitable forthis.
For heavier soiling, you can apply a fine paint-work polish with a microfiber cloth. Removethe excess polish residue after polishing.
Impurities combined with the effects of road gritand corrosive environmental factors may causeflash rust to form on the surface. You canrestore the original shine of the exhaust pipe bycleaning it regularly, especially in winter andafter washing.
XClean the exhaust pipe with a care producttested and approved by Mercedes-Benz.
Cleaning the trailer tow hitch
HEnvironmental note
Dispose of rags soaked in oil and grease in an
environmentally responsible manner.
!Please note the care instructions in thetrailer coupling manufacturer's operatinginstructions.
The ball coupling must be cleaned if it becomesdirty or corroded.
XRemove rust on the ball, e.g. with a wirebrush.
XRemove dirt with a clean, lint-free cloth or abrush.
XAfter cleaning, lightly oil or grease the ballcoupling.
XCheck that the vehicle's trailer tow hitch isworking properly.
You can also have the maintenance work on theball coupling and the trailer tow hitch carried outby a qualified specialist workshop.
Interior care
Cleaning the display
!For cleaning, do not use any of the following:
Ralcohol-based thinner or gasoline
Rabrasive cleaning agents
Rcommercially-available household cleaningagents
These may damage the display surface. Donot put pressure on the display surface whencleaning. This could lead to irreparable dam-age to the display.
XBefore cleaning the display, make sure that itis switched off and has cooled down.
XClean the display surface using a commer-cially available microfiber cloth and TFT/LCDdisplay cleaner.
XDry the display surface using a dry microfibercloth.
Cleaning the plastic trim
GWARNING
Care products and cleaning agents containing
solvents cause surfaces in the cockpit to
become porous. As a result, plastic parts may
come loose in the event of air bag deploy-
ment. There is a risk of injury.
Do not use any care products and cleaning
agents to clean the cockpit.
!Never attach the following to plastic surfa-ces:
Rstickers
Rfilms
Rperfume oil container or similar
You could otherwise damage the plastic.
!Do not allow cosmetics, insect repellent orsunscreen to come into contact with the plas-tic trim. This maintains the high-quality look ofthe surfaces.
XWipe the plastic trim with a damp, lint-freecloth, e.g. a microfiber cloth.
XHeavy soiling:use care and cleaning prod-ucts recommended and approved byMercedes-Benz.The surface may change color temporarily.Wait until the surface is dry again.
310Care
Maintenance and care