warning light MERCEDES-BENZ GLC 2019 Service Manual

Problems with Parking Assist PARKTRONIC
ProblemPossible causes/consequences andPPSolutions
Only the red segments inthe Parking AssistPARKTRONIC warningdisplays are lit. You alsohear a warning tone forapproximately two sec-onds.
Parking AssistPARKTRONIC is thendeactivated and the indi-cator lamp on thePARKTRONIC buttonlights up.
Parking Assist PARKTRONIC has malfunctioned and has been deacti-vated.
XIf problems persist, have Parking Assist PARKTRONIC checked at aqualified specialist workshop.
Only the red segments inthe Parking AssistPARKTRONIC warningdisplays are lit. ParkingAssist PARKTRONIC isthen deactivated.
The Parking Assist PARKTRONIC sensors are dirty or there is inter-ference.
XClean the Parking Assist PARKTRONIC sensors (Ypage 309).
XSwitch the ignition back on.
The problem may be caused by an external source of radio or ultra-sound waves.
XCheck to see if Parking Assist PARKTRONIC works at a differentlocation.
Rear view camera
General notes
Rear view cameraCis an optical parking andmaneuvering aid. It shows the area behind thevehicle with guide lines in the multimedia sys-tem.
The area behind the vehicle is displayed as amirror image, as in the rear view mirror.
iThe text shown in the multimedia systemdepends on the language setting. The follow-
ing are examples of rear view camera displaysin the multimedia system.
Important safety notes
The rear view camera is only an aid. It is not areplacement for your attention to your immedi-ate surroundings. You are always responsiblefor safe maneuvering and parking. Make surethat there are no persons, animals or objects inthe maneuvering area while maneuvering andparking in parking spaces.
Under the following circumstances, the rearview camera will not function, or will function ina limited manner:
Rif the tailgate is open
Rin heavy rain, snow or fog
Rat night or in very dark places
Rif the camera is exposed to very bright light
Rif the area is lit by fluorescent bulbs or LEDlighting (the display may flicker)
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sors. A warning lamp lights up in the exteriormirrors and draws your attention to vehiclesdetected in the monitored area. If you thenswitch on the corresponding turn signal tochange lanes, you will also receive a visual warn-ing and a warning tone.
Blind Spot Assist supports you from a speed ofapproximately 20 mph (30 km/h).
Important safety notes
GWARNING
Blind Spot Assist does not react to:
Rvehicles overtaken too closely on the side,
placing them in the blind spot area
Rvehicles which approach with a large speed
differential and overtake your vehicle
As a result, Blind Spot Assist may not give
warnings in such situations. There is a risk of
an accident.
Always observe the traffic conditions care-
fully, and maintain a safe lateral distance.
Blind Spot Assist is only an aid. It may fail todetect some vehicles and is no substitute forattentive driving. Always ensure that there issufficient distance to the side for other roadusers and obstacles.
iUSA only:
This device has been approved by the FCC asa "Vehicular Radar System". The radar sensoris intended for use in an automotive radarsystem only. Removing, tampering with, oraltering the device will void any warranties,and is not permitted by the FCC. Do not tam-per with, alter, or use in any non-approvedway.
Any unauthorized modification to this devicecould void the user's authority to operate theequipment.
Radar sensors
The radar sensors for Blind Spot Assist are inte-grated into the rear bumper. Make sure that thebumpers are free from dirt, ice or slush. Thesensors must not be covered, for example bycycle racks or overhanging loads. Following asevere impact or in the event of damage to thebumpers, have the function of the radar sensorschecked at a qualified specialist workshop.Blind Spot Assist may no longer work properly.
Monitoring area
In particular, the detection of obstacles can beimpaired if:
RThere is dirt on the sensors or anything elsecovering the sensors
Rthere is poor visibility, e.g. due to fog, heavyrain, snow or spray
Rthere are narrow vehicles, e.g. motorcycles orbicycles
Rthe road has very wide lanes
Rthe road has narrow lanes
Ryou are not driving in the middle of the lane
Rthere are barriers or other road boundaries
Vehicles in the monitoring range are then notindicated.
At a distance of around 1.6 ft (0.5 m)Dfrom thevehicle, Blind Spot Assist monitors the area upto 10 ft (3 m) next to

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.
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This function is available in the range between40 mph and 120 mph (60 km/hand 200 km/h).
A warning may be given if a front wheel passesover a lane marking. It will warn you by means ofintermittent vibration in the steering wheel forup to 1.5 seconds.
Important safety notes
GWARNING
Lane Keeping Assist cannot always clearly
detect lane markings.
In such cases, Lane Keeping Assist can:
Rgive an unnecessary warning
Rnot give a warning
There is a risk of an accident.
Always pay particular attention to the traffic
situation and keep within the lane, especially
if Lane Keeping Assist alerts you.
GWARNING
The Lane Keeping Assist warning does not
return the vehicle to the original lane. There is
a risk of an accident.
You should always steer, brake or accelerate
yourself, in particular if warned by Lane Keep-
ing Assist.
Lane Keeping Assist can neither reduce the riskof an accident if you fail to adapt your drivingstyle nor override the laws of physics. LaneKeeping Assist cannot take into account theroad, traffic and weather conditions. Lane Keep-ing Assist is merely an aid. You are responsiblefor the distance to the vehicle in front, for vehi-cle speed, for braking in good time and for stay-ing in your lane.
The Lane Keeping Assist does not keep the vehi-cle in the lane.
The system may be impaired or may not functionif:
Rthere is poor visibility, e.g. due to insufficientillumination of the road, or due to snow, rain,fog or heavy spray
Rthere is glare, e.g. from oncoming traffic, thesun or reflection from other vehicles (e.g. ifthe road surface is wet)
Rthe windshield is dirty, fogged up, damaged orcovered, for instance by a sticker, in the vicin-ity of the camera
Rthere are no or several unclear lane markingsfor one lane, e.g. roadworks
Rthe lane markings are worn away, dark or cov-ered up, e.g. by dirt or snow
Rthe distance to the vehicle in front is too shortand thus the lane markings cannot be detec-ted
Rthe lane markings change quickly, e.g. lanesbranch off, cross one another or merge
Rthe road is narrow and winding
Rthere are highly variable shade conditions onthe roadway
Activating/deactivating Lane Keeping
Assist
XTo activate:press buttonD.
Indicator lampClights up. TheLane Keep‐Lane Keep‐ingingAssistAssistOnOnmessage appears in the mul-tifunction display. If all conditions have beensatisfied, there may be a warning.
If you drive at speeds above 40 mph(60 km/h) and lane markings are detected,the lines in the assistance graphic are shownin green (Ypage 219). Lane Keeping Assist isready for use.
XTo deactivate:press buttonD.Indicator lampCgoes out. Lane KeepingAssist is deactivated. TheLane KeepingLane KeepingAssist OffAssist Offmessage appears in the multi-function display.
Selecting Standard or Adaptive setting
XIn theDriveAssistDriveAssistmenu on the on-boardcomputer, select theLaneLaneKeepingKeepingAssistAssistfunction (Ypage 221).
XSelectStandardStandardorAdaptiveAdaptive.
Standard
WhenStandardStandardis selected, no warning vibra-tion occurs if:
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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®.
Adaptive
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.
In order that you are warned only when neces-sary and in good time if you cross the lane mark-ing, the system detects certain conditions andwarns 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
Driving Assistance Plus package
General notes
The Driving Assistance Plus Package consists ofActive Distance Assist DISTRONIC(Ypage 162), Active Blind Spot Assist(Ypage 197) and Active Lane Keeping Assist(Ypage 200).
Active Blind Spot Assist
General notes
Active Blind Spot Assist monitors the areas oneither side of the vehicle that are not visible tothe driver with two lateral, rear-facing radar sen-sors. A warning lamp lights up in the exteriormirrors and draws your attention to vehicles
detected in the monitored area. If you thenswitch on the corresponding turn signal tochange lanes, you will also receive a visual warn-ing and hear a warning tone. If a risk of lateralcollision is detected, corrective braking mayhelp you avoid a collision. Before a course-cor-recting brake application, Active Blind SpotAssist evaluates the space in the direction oftravel and at the sides of the vehicle. For this,Active Blind Spot Assist uses the forward-facingradar sensors.
Active Blind Spot Assist supports you from aspeed of approximately 20 mph(30 km/h).
Important safety notes
Active Blind Spot Assist is only an aid and is nota substitute for attentive driving.
GWARNING
Active Blind Spot Assist does not react to:
Rvehicles overtaken too closely on the side,
placing them in the blind spot area
Rvehicles which approach with a large speed
differential and overtake your vehicle
As a result, Active Blind Spot Assist may nei-
ther give warnings nor intervene in such sit-
uations. There is a risk of an accident.
Always observe the traffic conditions care-
fully, and maintain a safe lateral distance.
iUSA only: This device has been approved bythe FCC as a "Vehicular Radar System". Theradar sensor is intended for use in an auto-motive radar system only. Removal, tamper-ing, or altering of the device will void any war-ranties, and is not permitted by the FCC. Donot tamper with, alter, or use in any non-approved way.
Any unauthorized modification to this devicecould void the user's authority to operate theequipment.
iCanada only: This device complies withRSS-210 of Industry Canada. Operation issubject to the following two conditions:
1. This device may not cause interference,and
2. This device must accept any interferencereceived, including interference that maycause undesired operation of the device.
Removal, tampering, or altering of the devicewill void any warranties, and is not permitted.
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If you select the reverse gear, Active Blind SpotAssist is not operational.
The brightness of the warning lamps is auto-matically adapted to the brightness of the sur-roundings.
When Active Blind Spot Assist is activated, grayradar waves propagating backward appear nextto the vehicle in the assistance display in themultifunction display. Above a speed of 20 mph(30 km/h), the color of the radar waves in theassistance display changes to greenD. ActiveBlind Spot Assist is then ready for use.
Collision warning from visual warning and
warning tone
If you switch on the turn signal to change lanesand a vehicle is detected in the side monitoringrange, you receive a visual warning and a warn-ing tone as a collision warning. You will thenhear a double warning tone and red warninglampCflashes. If the turn signal remains on,detected vehicles are indicated by the flashingof red warning lampC. No further warning tonesounds.
Course-correcting brake application
If Active Blind Spot Assist detects a risk of a lat-eral collision in the monitoring range, a course-correcting brake application is carried out. Thisis meant to assist you in avoiding a collision.
GWARNING
A course-correcting brake application cannot
always prevent a collision. There is a risk of an
accident.
Always steer, brake or accelerate yourself,
especially if Active Blind Spot Assist warns
you or makes a course-correcting brake appli-
cation. Always maintain a safe distance at the
sides.
If a course-correcting brake application occurs,red warning lampCflashes in the exterior mir-ror and a double warning tone sounds. In addi-tion, a display underlining the danger of a sidecollision appears in the multifunction display.
In very rare cases, the system may make aninappropriate brake application. A course-cor-recting brake application may be interrupted atany time by countersteering slightly or acceler-ating.
The course-correcting brake application is avail-able in the speed range between 20 mph(30 km/h) and 120 mph (200 km/h).
Either no braking application, or a course-cor-recting brake application adapted to the drivingsituation occurs if:
Rthere are vehicles or obstacles, e.g. crashbarriers, located on both sides of your vehicle.
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 in the on-board computer(Ypage 220).
XSwitch on the ignition.Warning lampsCin the exterior mirrors lightup red for approximately 1.5 seconds.
Gray radar waves propagating backwardsDappear next to the vehicle on the assistantdisplay on the multifunction display.
Above a speed of 20 mph (30 km/h), the colorof the radar waves on the assistant displaychanges to greenD. Active Blind Spot Assistis 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. Active Blind Spot Assist is then deacti-vated. Radar wavesDnext to the vehicle arehidden in the assistance graphic. TheActiveActiveBlind Spot Asst. Not Available WhenBlind Spot Asst. Not Available When
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Lane-correcting brake application
If you leave your lane, under certain circumstan-ces the vehicle will brake briefly on one side.This is meant to assist you in bringing the vehicleback to the original lane.
GWARNING
A lane-correcting brake application cannot
always bring the vehicle back into the original
lane. There is a risk of an accident.
Always steer, brake or accelerate yourself,
especially if Active Lane Keeping Assist warns
you or makes a lane-correcting brake appli-
cation.
If a lane-correcting brake application occurs,displayCappears in the multifunction display.The brake application also slightly reduces vehi-cle speed.
A lane-correcting brake application can be madeafter driving over a lane marking recognized asbeing solid or broken. Before this, a warningmust be given by means of intermittent vibrationin the steering wheel. In addition, a lane withlane markings on both sides must have beendetected.
In the case of a broken lane marking beingdetected, a lane-correcting brake applicationcan only be made if a vehicle has been detectedin the adjacent lane. Oncoming vehicles, over-taking vehicles and vehicles in adjacent lanescan be detected.
A further lane-correcting brake application canonly occur after your vehicle has returned to theoriginal lane.
No lane-correcting brake application occurs if:
Ryou clearly and actively steer, brake or accel-erate
Ryou cut the corner on a sharp bend
Ryou have switched on the turn signal
Ra driving safety system intervenes, e.g. ESP®,
PRE-SAFE®Brake or Active Blind Spot Assist
Ryou have adopted a sporty driving style withhigh cornering speeds or high rates of accel-eration
RESP®is switched off
Rthe transmission is not in position[
Ron vehicles with a trailer tow hitch, the elec-trical connection to the trailer has been cor-rectly established
Ra loss of tire pressure or a defective tire hasbeen detected and displayed.
Ran obstacle has been detected in the lane inwhich you are driving
Active Lane Keeping Assist may not detect otherroad users or traffic situations. An inappropriatebrake application may be interrupted at any timeif you:
Rsteer slightly in the opposite direction
Rswitch on the turn signal
Ryou brake or accelerate significantly.
A lane-correcting brake application is interrup-ted automatically if:
Ra driving safety system intervenes, e.g. ESP®,
PRE-SAFE®Brake or Active Blind Spot Assist
Rlane markings are no longer detected
Activating/deactivating Active Lane
Keeping Assist
XTo activate:press buttonD.
Indicator lampClights up. TheLane Keep‐Lane Keep‐ingingAssistAssistOnOnmessage appears in the mul-tifunction display. If all conditions have beensatisfied, a warning or steering interventionmay be made.
If you drive at speeds above 40 mph(60 km/h) and lane markings are detected,
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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.
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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 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.
If the operating safety of your vehicle isimpaired, pull over as soon as it is safe to do so.Contact a qualified specialist workshop.
The on-board computer only shows messages orwarnings from certain systems in the multifunc-tion display. You should therefore make sureyour vehicle is operating safely at all times.
For an overview, see the instrument panel illus-tration (Ypage 36).
Displays and operation
Instrument cluster lighting
The lighting in the instrument cluster, in the dis-plays and the controls in the vehicle interior canbe adjusted using brightness control knobC.
XTurn brightness control knobCup or down.If you turn the light switch (Ypage 109) to the`,XorXposition, the brightnesswill depend upon the brightness of the ambi-ent light.
iThe light sensor in the instrument clusterautomatically controls the brightness of themultifunction display.
In daylight, the displays in the instrumentcluster are illuminated. A dimming function isnot possible in daylight.
Speedometer with segments
The speedometer is divided into segmentsdepending on the equipment.
The segments in the speedometer indicatewhich speed range is available.
RCruise control activated (Ypage 160):
The segments light up from the stored speedto the end of the scale.
RActive Distance Assist DISTRONIC activated(Ypage 164):
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 the vehi-cle in front and the stored speed light up.
208Displays and operation
On-board computer and displays

Display messagesPossible causes/consequences andPPSolutions
The yellow$warning lamp and the redI(USA only) or$(Canada only) indicator lamp light up.
The electric parking brake is malfunctioning.
To release:
XSwitch off the ignition and turn it back on.
XRelease the electric parking brake manually.
or
XRelease the electric parking brake automatically (Ypage 155).
If the electric parking brake still cannot be released:
XDo not drive on.
XConsult a qualified specialist workshop.
The redI(USA only) or$(Canada only) indicator lamp flashesand the yellow$warning lamp lights up.
The electric parking brake is malfunctioning.
To release:
XSwitch off the ignition and turn it back on.
XRelease the electric parking brake manually.
To apply:
XSwitch off the ignition and turn it back on.
XApply the electric parking brake manually.
If the redI(USA only) or$(Canada only) indicator lamp con-tinues to flash:
XDo not drive on.
XSecure the vehicle against rolling away (Ypage 351).
XShift the transmission to position].
XTurn the front wheels towards the curb.
XConsult a qualified specialist workshop.
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On-b oard computer and displays
Z