warning light MERCEDES-BENZ CLA 2014 Repair Manual

Display messagesPossible causes/consequences and
Solutions
The red(USA only)/ (Canada only) indicatorlamp
flashes and 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 red(USA only)/ (Canada only) indicator lamp
continues to flash:
XDo not drive on.
XSecure the vehicle against rolling away (Ypage 337).
XShift the transmission toP.
XTurn the frontwheels towards the curb.
XConsult a qualified specialist workshop.
The yellow warning lamp lights up. The red(USA
only)/ (Canada only) indicator lamp flashes for about ten
seconds after the electric parking brake has been applied or
released. It then goes out or remains lit.
The electric parking brake is malfunctioning.
XSwitch off the ignition and turn it back on.
XApply the electric parking brake.
If it is not possible to engage the electric parking brake:
XShift the transmission toP.
XVisit a qualified specialist workshop.
If it is not possible to release the electric parking brake:
XRelease the electric parking brake automatically (Ypage 154).
If the electric parking brake still cannot be released:
XConsult a qualified specialist workshop.
Display messages217
On-board computer and displays
Z

Display messagesPossible causes/consequences and
Solutions
The yellow warning lamp lights up. If you manually apply or
release the electric parkingbrake, the red(USA
only)/ (Canada only) indicator lamp flashes.
The electric parking brake is malfunctioning. It is not possible to
apply the electric parking brake manually.
XShift the transmission toP.
XVisitaqualified specialist workshop.
(USA
only) (Canada
only)
Parking Brake
Inoperative
The yellow warning lamp lights up. The red(USA
only)/ (Canada only) indicator lamp flashes for about ten
seconds after the electric parking brake has been applied or
released. It then goes out or remains lit.
The electric parking brake is malfunctioning, e.g. because of
overvoltage or undervoltage.
XRemove the cause for the overvoltage or undervoltage, e.g. by
charging the battery or restarting the engine.
XEngage or release the electric parking brake.
If it remains impossible to apply or release the electric parking
brake:
XSwitch off the ignition and turn it back on.
XEngage or release the electric parking brake.
If the electric parking brake still cannot be released:
XConsult a qualified specialist workshop.
The display message is only shown while the vehicle is in motion.
The yellow warning lamp lights up and the red(USA
only)/ (Canada only) indicator lamp flashes.
It is not possible to apply the electric parking brake manually.
XShift the transmission toP.
XVisit a qualified specialist workshop.
(USA
only) (Canada
only)
Turn On the
Ignition to
Release the
Parking Brake
The red(USA only)/ (Canada only) indicator lamp lights
up.
You attempted to release the electric parking brake while the
ignition was switched off.
XTurn the SmartKey to position1in the ignition lock.
218Display messages
On-board computer and displays

Display messagesPossible causes/consequences and
Solutions
(USA
only)(Canada
only)
Check Brake Fluid
Level
There is notenough brake fluid in the brake fluid reservoir.
In addition, the(USA only)/(Canada only) warning
lamp lights up in the instrument cluster and a warning tone
sounds.
GWARNING
The braking effect may be impaired.
There is a riskofanaccident.
XPull overand stop the vehicle safely as soonas possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
XSecure the vehicle against rolling away (Ypage 153).
XConsult a qualified specialist workshop.
XDo not add brake fluid. This does not correct the malfunction.

Check Brake Pad
Wear
The brake pads/linings have reached their wear limit.
XVisit a qualified specialist workshop.

mbrace Inoperative
One or more main features of the mbrace system are
malfunctioning.
XHave the mbrace system checked immediately at a qualified
specialist workshop.

SRS Malfunction
Service Required
There is a malfunction in the SRS (Supplemental Restraint
System). Thewarning lamp also lights up in the instrument
cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be
triggered unintentionally or, in the event of an accident, may not
be triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop.
Further information on occupant safety (Ypage 38).
Display messages219
On-board computer and displays
Z

Display messagesPossible causes/consequences and
Solutions

Front Left
Malfunction
Service Required
orFront Right
Malfunction
Service Required
SRS has malfunctioned at the front on the left or right. The
warning lamp also lights up in the instrumentcluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be
triggered unintentionally or, in the event of an accident, may not
be triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop.

Rear Left
Malfunction
Service Required
orRear Right
Malfunction
Service Required
SRS has malfunctionedat the rear on the left or right. The
warning lamp also lights up in the instrument cluster.
GWARNING
The airbags or Emergency Tensioning Devices may either be
triggered unintentionally or, in the event of an accident, may not
be triggered.
There is an increased riskofinjury.
XVisitaqualified specialist workshop.

Left Side Curtain
AirbagMalfunction
Service Required
orRight Side
Curtain Airbag
Malfunction
Service Required
There is a malfunction in the left-hand or right-hand window
curtain air bag. Thewarning lamp also lights up in the
instrument cluster.
GWARNING
The left or right window curtain air bag may either be triggered
unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
XVisit a qualified specialist workshop.
220Display messages
On-board computer and displays

Display messagesPossible causes/consequences and
Solutions
Front Passenger
Airbag Disabled
See Operator's
Manual
The front-passenger air bag is disabled during the journey, even
though:
Ran adult
or
Ra person larger than a certain size is occupying the front-
passenger seat
If additional forces are applied to the seat, the system may
interpret the occupant's weight as lowerthan it actually is.
GWARNING
The front-passenger air bag does not deploy during an accident.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 153).
XSwitch the ignition off.
XHave the occupant get out of the vehicle.
XKeep the seat unoccupied, close the front-passenger door and
switch on the ignition.
XObserve the PASSENGER AIR BAG OFF indicator lamp in the
center console and the multifunction display and check the
following:
Seat unoccupied and ignition switched on:
Rthe PASSENGER AIR BAG OFF indicator lamp must light up and
remain lit. If the indicator lamp is on, OCS has disabled the front-
passenger air bag (Ypage 45).
RtheFront Passenger Airbag Enabled See Operator's
ManualorFront Passenger Airbag Disabled See
Operator's Manualdisplay messages must not be shown in
the multifunction display.
XWait for a period of at least 60 seconds until the necessary
system checks have been completed.
XMake sure that the display messages do not appearinthe
multifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the PASSENGER AIR BAG OFF indicator
lamp remains lit or goes out depends on how OCS classifies the
occupant.
If the conditions are not fulfilled, the system is not operating
correctly.
XVisit a qualified specialist workshop immediately.
Display messages221
On-board computer and displays
Z

Display messagesPossible causes/consequences and
Solutions
Forfurther information about the OccupantClassification System,
see (Ypage 45).
Front Passenger
AirbagEnabledSee
Operator's Manual
The front-passenger air bag is enabled during the journey, even
though:
Ra child, a small adult or an object weighing less than the
system's weight 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 on the seat.
GWARNING
The air bag may deploy unintentionally.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 153).
XSwitch the ignition off.
XOpen the front-passenger door.
XRemove the child and the child restraint system fromthe front-
passenger seat.
XMake sure that there are no objects on the seat adding to the
weight.
The system may otherwise detect the additional weight and
interpret the seat occupant's weight as greater than it actually
is.
XKeep the seat unoccupied, close the front-passenger door and
switch on the ignition.
XObserve the PASSENGER AIR BAG OFF indicator lamp in the
center console and the multifunction display and check the
following:
Seat unoccupied and ignition switched on:
Rthe PASSENGER AIR BAG OFF indicator lamp must light up and
remain lit. If the indicator lamp is on, OCS (Occupant
Classification System) has disabled the front-passenger air bag
(Ypage 45).
RtheFront Passenger Airbag Enabled See Operator's
ManualorFront Passenger Airbag Disabled See
Operator's Manualdisplay messages must not be shown in
the multifunction display.
222Display messages
On-board computer and displays

Display messagesPossible causes/consequences and
Solutions

Check Rear Left
Sidemarker Lampor
Check Rear Right
Sidemarker Lamp
The rear leftorright side marker lamp is defective.
XCheck whether you are permitted to replace the bulb yourself
(Ypage 111).
or
XVisit a qualified specialist workshop.

CheckLeftDaytime
Running Lightor
Check Right
Daytime Running
Light
The left-hand or right-hand daytime running lamp is faulty.
XCheck whether you are permitted to replace the bulb yourself
(Ypage 111).
or
XVisit a qualified specialist workshop.

Active Light
System Inoperative
The active light function is defective.
XVisit a qualified specialist workshop.

Malfunction See
Operator's Manual
The exterior lighting is defective.
XVisit a qualified specialist workshop.

AutoLampFunction
Inoperative
The light sensor is defective.
XVisit a qualified specialist workshop.

Switch Off Lights
The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
XTurn the light switch to.
Adaptive Highbeam
Assist Inoperative
Adaptive Highbeam Assist is faulty.
XVisit a qualified specialist workshop.
Adaptive Highbeam
Assist Currently
Unavailable See
Operator'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,
theAdaptive Highbeam Assist Now Availablemessage is
displayed.
Adaptive Highbeam Assist is operational again.
226Display messages
On-board computer and displays

Display messagesPossible causes/consequences and
Solutions
Wiper
Malfunctioning
The windshield wipers are malfunctioning.
XVisit a qualified specialist workshop.
Hazard Warning
Flashers
Malfunctioning
The hazard warning lamps are faulty.
XVisit a qualified specialist workshop.
SmartKey
Display messagesPossible causes/consequences and
Solutions

Key Does Not
Belong to Vehicle
You have put the wrong SmartKey in the ignition lock.
XUse the correct SmartKey.

TakeYourKeyfrom
Ignition
The SmartKey is in the ignition lock.
XRemove the SmartKey.

Obtain a New Key
The SmartKey needs to be replaced.
XVisit a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster
Seatbelts
ProblemPossible causes/consequences and
Solutions

After starting the
engine, the red seat
belt warning lamp lights
up for six seconds.
The seat belt warning lamp reminds the driver and frontpassenger
to fasten their seat belts.
XFastenyour seat belt (Ypage 50).

After starting the
engine, the red seat
belt warning lamp lights
up. In addition, a
warning tone sounds
for up to six seconds.
The driver's seat belt is not fastened.
XFasten your seat belt (Ypage 50).
The warning tone ceases.
240Warning and indicator lamps in the instrument cluster
On-board computer and displays

ProblemPossible causes/consequences and
Solutions

The red seat belt
warning lamp lights up
after the engine starts,
as soon as the driver's
or the front-passenger
door is closed.
The driver or front passenger has not fastened their seat belt.
XFasten your seat belt (Ypage 50).
The warning lamp goes out.
There are objects on the front-passenger seat.
XRemove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out.

The red seat belt
warning lamp flashes
and an intermittent
audible warning
sounds.
The driver or front passenger has not fastened their seat belt. In
addition, you are driving faster than 15 mph (25 km/h)or you have
briefly driven faster than 15 mph (25 km/h).
XFasten your seat belt (Ypage 50).
The warning lamp goes out and the intermittentwarning tone
ceases.
There are objects on thefront-passengerseat. In addition, you are
driving faster than 15 mph (25 km/h) or you have briefly driven
faster than 15 mph (25 km/h).
XRemove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out and the intermittentwarning tone
ceases.
Warning and indicator lamps in the instrument cluster241
On-board computer and displays
Z

ProblemPossible causes/consequences and
Solutions

The yellow ABS warning
lamp is lit while the
engine is running.
ABS is temporarily unavailable. BAS, COLLISION PREVENTION
ASSIST, COLLISION PREVENTION ASSIST PLUS, ESP®, EBD
(electronic brake force distribution), the HOLD function and hill
start assist, for example, are therefore also deactivated.
Possible causes are:
Rself-diagnosis is not yet complete.
Rthe on-board voltage may be insufficient.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely
affected. The braking distance in an emergency braking situation
can increase.
If ESP®is not operational, ESP®is unable to stabilize the vehicle.
There is a risk of an accident.
XCarefully drive a suitable distance, making slight steering
movements at a speed above 12 mph (20 km/h).
The functions mentioned above are available again when the
warning lamp goes out.
If the warning lamp is still on:
XObserve the additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster243
On-board computer and displays
Z