2014 MERCEDES-BENZ CLA ABS

XRepeatedly tap the SmartKey against your
palm until battery"falls out.
XInsertthe new battery with the positive
terminal facing upwards. Use a lint-free
cloth to do so.
XMake sure that the surface of the battery is
free from lint, grease and all other forms of
contamination.
XInsert the front tabs of battery tray
coverand then press to close it.
XInsert the mechanical key into the
SmartKey.
XCheck the function of all SmartKey buttons
on the vehicle.
SmartKey75
Opening and closing
Z

PARKTRONIC
Important safety notes
PARKTRONIC is an electronic parking aid with
ultrasonic sensors. It monitors the area
around your vehicle using six sensors in the
front bumper and six sensors in the rear
bumper. PARKTRONIC indicates visually and
audibly the distance between your vehicle
and an object.
PARKTRONIC is only an aid. It is not a
replacement for your attention to your
immediate surroundings. You are always
responsible for safe maneuvering, parking
and exiting a parking space. When
maneuvering, parking or pulling out of a
parking space, make sure that there are no
persons, animals or objectsinthe area in
which you are maneuvering.
!When parking, pay particular attention to
objects above or below the sensors, such
as flower pots or trailer drawbars.
PARKTRONIC does not detect such objects
when they are in the immediate vicinity of
the vehicle. You could damage the vehicle
or the objects.
The sensors may not detect snow and other
objects that absorb ultrasonic waves.
Ultrasonic sources such as an automatic
car wash, the compressed-air brakes on a
truck or a pneumatic drill could cause
PARKTRONIC to malfunction.
PARKTRONIC may not function correctly on
uneven terrain.
PARKTRONIC is activated automatically when
you:
Rswitch on the ignition
Rshift the transmission to positionD,RorN
Rrelease the electric parking brake
PARKTRONIC is deactivated at speeds above
11 mph (18 km/h). It is reactivated at lower
speeds.
Range of the sensors
General notes
PARKTRONIC does not take objects into
consideration that are:
Rbelow the detection range, e.g. people,
animals or objects
Rabove the detection range, e.g.
overhanging loads, truck overhangs or
loading ramps.
Sensors in the front bumper, left-hand
side (example)
Side view
Top view
The sensors must be free from dirt, ice or
slush. They can otherwise not function
correctly. Cleanthe sensors regularly, taking
Driving systems175
Driving and parking
Z

front, for vehicle speed, for braking in good
time and for staying in yourlane.
The Lane Keeping Assist does notkeep the
vehicle in the lane.
The system may be impaired or may not
function if:
Rthere is poor visibility, e.g. due to
insufficient illumination of the road, or due
to snow, rain, fog or spray
Rthere is glare, e.g. from oncoming traffic,
the sun or reflections (e.g. when the road
surface is wet)
Rthe windshield is dirty, fogged up, damaged
or covered, for instance by a sticker, in the
vicinity of the camera
Rthere are no, several or unclear lane
markings for a lane, e.g. in areas with road
construction work
Rthe lane markings are worn away, dark or
covered up, e.g. by dirt or snow
Rthe distance to the vehicle in front is too
small and the lane markings thus cannot be
detected
Rthe lane markings change quickly, e.g.
lanes branch off, cross one another or
merge
Rthe road is narrow and winding
Rthere are strong shadows cast on the lane
A warning may be given if a front wheel
passes over a lane marking. It will warn you
by means of intermittent vibration in the
steering wheel for up to 1.5 seconds.
Switching on Lane Keeping Assist
XSwitch on Active Lane Keeping Assist using
the on-board computer; to do so, select
StandardorAdaptive(Ypage 205).
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected,
the lane markings in the assistance
graphics display (Ypage 203) are shown
in green.
WhenStandardis selected, no warning
vibration occurs if:
Ryou switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time.
Ra driving safety system intervenes, such as
ABS, BAS or ESP®.
WhenAdaptiveis selected, no warning
vibration occurs if:
Ryou switch on the turn signals. In this event,
the warnings are suppressed for a certain
period 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 an
obstacle or change lanes quickly.
Ryou cut the corner on a sharp bend.
In order that you are warned only when
necessary and in good time if you cross the
lane marking, the system recognizes certain
conditions and warns you accordingly.
The warning vibration occurs earlier if:
Ryou approach the outer lane marking on a
bend.
Rthe road has very wide lanes, e.g. a
freeway.
Rthe system recognizes solid lane markings.
The warning vibration occurs later if:
Rthe road has narrow lanes.
Ryou cut the corner on a bend.
Driving systems191
Driving and parking
Z

Safety systems
Display messagesPossible causes/consequences and
Solutions

Currently
Unavailable See
Operator's Manual
ABS (Anti-lock Braking System), ESP®(Electronic Stability
Program), BAS (Brake Assist), the HOLD function and hill start
assist are temporarily unavailable.
COLLISION PREVENTION ASSIST/COLLISION PREVENTION
ASSIST PLUS may also have failed.
In addition, the,andwarning lamps light up in
the instrument cluster.
ATTENTION ASSIST is deactivated.
Possible causes are:
Rself-diagnosis is not yet complete.
Rthe on-board voltage may be insufficient.
GWARNING
The brake system continues to function normally, but without the
functions listed above. The 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 an increased risk of skidding and an accident.
XCarefully drive a short distance on a suitable stretch of road,
making slight steering movements at a speed above 12 mph
(20 km/h).
If the display message disappears, the functions mentioned
above are available again.
If the display message continues to be displayed:
XDrive on carefully.
XVisit a qualified specialist workshop.

Inoperative See
Operator's Manual
ABS, ESP®, BAS, the HOLD function and hill start assist are
unavailable due to a malfunction.
COLLISION PREVENTION ASSIST/COLLISION PREVENTION
ASSIST PLUS may also have failed.
In addition, the,,andwarning lamps light
up in the instrument cluster.
ATTENTION ASSIST is deactivated.
GWARNING
Display messages213
On-board computer and displays
Z

Display messagesPossible causes/consequences and
Solutions

Inoperative See
Operator's Manual
ESP®, BAS, the HOLD function and hill start assist are unavailable
due to a malfunction.
COLLISION PREVENTION ASSIST/COLLISION PREVENTION
ASSIST PLUSmay also have failed.
In addition, theandwarning lamps light up in the
instrument cluster.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continuesto function normally, but without the
functions listed above.
The braking distance in an emergency braking situation can thus
increase.
If ESP®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XDrive on carefully.
XVisit a qualified specialist workshop.


Inoperative See
Operator's Manual
EBD (electronic brake force distribution), ABS, ESP®, BAS, the
HOLD function and hill start assist are not available due to a
malfunction.
COLLISION PREVENTION ASSIST/COLLISION PREVENTION
ASSIST PLUS may also have failed.
In addition, the,andwarning lamps light up in
the instrument cluster and a warning tone sounds.
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 an increased risk of skidding and an accident.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
Display messages215
On-board computer and displays
Z

Safety systems
ProblemPossible causes/consequences and
Solutions
(USA only)
(Canada only)
The red brake system
warning lamp comes on
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 road and traffic conditions. Do not continue driving
under any circumstances.
XSecure the vehicle against rolling away (Ypage 153).
XDo not add brake fluid. Adding more will not remedy the
malfunction.
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction
display.

The yellow ABS warning
lamp is lit while the
engine is running.
ABS (Anti-lock Braking System) is deactivated due to a
malfunction. Therefore, BAS (Brake Assist), COLLISION
PREVENTION ASSIST, COLLISION PREVENTION ASSIST PLUS,
ESP®(Electronic Stability Program), the HOLD function and hill
start assist, for example, are also deactivated.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the
functions listed above. The 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 an increased risk of skidding and an accident.
XObserve the additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop.
If the ABS control unit is faulty, there is also a possibility that other
systems, such as the navigation system or the automatic
transmission, will not be available.
242Warning and indicator lamps in the instrument cluster
On-board computer and displays

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

ProblemPossible causes/consequences and
Solutions

The yellow ABS warning
lamp is lit while the
engine is running. A
warning tone also
sounds.
EBD is malfunctioning. Therefore, ABS, BAS, COLLISION
PREVENTION ASSIST, COLLISION PREVENTION ASSIST PLUS,
ESP®, the HOLD function and hill start assist, for example, are not
available either.
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 an increased risk of skidding and an accident.
XObserve the additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop.
(USA only)
(Canada only)

The red brake warning
lamp, the yellow ESP®
and ESP®OFF warning
lamps and the yellow
ABS warning lamp are
lit while the engine is
running.
ABS and ESP®are malfunctioning. Therefore, BAS, COLLISION
PREVENTION ASSIST, COLLISION PREVENTION ASSIST PLUS,
EBD, the HOLD function and hill start assist, for example, are not
available either.
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 an increased risk of skidding and an accident.
XObserve the additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop.
244Warning and indicator lamps in the instrument cluster
On-board computer and displays