2013 MERCEDES-BENZ CLA-CLASS sensor

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variations are pos-
sible. Note that your vehicle may not be
equipped with all of the functions descri-
bed. This is also the case for systems and
functions relevant to safety.
i Read the information on qualified special-
ist workshops: ( Y page 24).
Important safety notes
GWARNING
Operating the integrated information systems
and communications equipment in the vehicle
while driving will distract you from traffic con-
ditions. You could then lose control of the
vehicle. There is a risk of an accident.
Only operate these devices if road traffic con-
ditions permit. If you are unsure about the
surrounding conditions, pull over to a safe
location and make entries only while the vehi-
cle is stationary.
GWARNING
If the instrument cluster has failed or mal-
functioned, you may not recognise function
restrictions 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.
You must observe the legal requirements for
the country in which you are currently driving
when operating the on-board computer.
The on-board computer only shows messages
or warnings from certain systems in the mul-
tifunction display. You should therefore make
sure your vehicle is operating safely at all
times. Otherwise, a vehicle that is not oper-
ating safely may cause an accident.
For an overview, see the instrument panel
illustration ( Y page 30).
Displays and operation
Instrument cluster lighting
The lighting in the instrument cluster, in the
displays and the controls in the vehicle inte-
rior can be adjusted using the brightness con-
trol knob.
The brightness control knob is on the bottom
left of the instrument cluster ( Y page 30).
XTurn the brightness control knob clockwise
or anti-clockwise.
If the light switch is set to Ã, T or
L , the brightness is dependant upon
the brightness of the ambient light.
i The light sensor in the instrument cluster
automatically controls the brightness of
the multifunction display.
In daylight, the displays in the instrument
cluster are not illuminated.
Coolant temperature gauge
GWARNING
If you open the bonnet while the engine is
overheating or while there is a fire in the
engine compartment, you could come into
contact with hot gases or other leaking
service products. There is a danger of injury.
Allow an overheating engine to cool down
before opening the bonnet. If there is a fire in
the engine compartment, leave the bonnet
closed and notify the fire brigade.
The coolant temperature gauge is in the
instrument cluster on the right-hand side.
Under normal operating conditions and with
the specified coolant level, the coolant tem-
perature may rise to 120 †.
208Displays and operationOn-board computer and displays
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XPress the a button.
The current selection is displayed.XTo activate/deactivate: press the a
button again.
When ATTENTION ASSIST ( Y page 195) is
deactivated, the é symbol appears in
the multifunction display in the assistance
graphics display.
Activating/deactivating Blind Spot
Assist
XPress the = or ; button on the steer-
ing wheel to select the Assist menu.XPress 9 or : to select Blind Spot
Asst. .XPress the a button.
The current selection is displayed.XTo activate/deactivate: press the a
button again.
For further information about Blind Spot
Assist, see ( Y page 197).
When the Blind Spot Assist: Sensors
deactivated message is shown, the radar
sensors are deactivated.
XSwitch on the radar sensor system
( Y page 223).
Activating/deactivating Lane Keeping
Assist
XPress the = or ; button on the steer-
ing wheel to select the Assist menu.XPress 9 or : on the steering wheel
to select Lane Keeping Assist .XPress the a button.
The current selection is displayed.XPress a to confirm.XPress the : or 9 button to set Off,
Standard or Adaptive .XPress the a button to save the setting.
When Lane Keeping Assist ( Y page 199) is
activated, the multifunction display in theassistance graphic shows the lane mark-
ings in green.
Service menu
In the Serv menu, you have the following
options:
R Calling up display messages in message
memory ( Y page 226)
R Restarting the tyre pressure loss warning
system ( Y page 321)
R Calling up the service due date
( Y page 286)
Settings menu
Introduction
In the Settings menu, you have the following
options:
R change the instrument cluster settings
R change the light settings
R change the vehicle settings
R change the auxiliary heating settings
( Y page 223)
R change the convenience settings
R restore the factory settings
Menus and submenus219On-board computer and displaysZProCarManuals.com

XPress the : or 9 button to select the
Lighting delayed sw. off: function.
When the Light. delay function is acti-
vated, the vehicle interior is displayed in
red in the multifunction display.XPress the a button to save the setting.
Vehicle
Setting permanent SPEEDTRONIC
XPress the = or ; button on the steer-
ing wheel to select the Settings menu.XPress the : or 9 button to select the
Vehicle submenu.XPress a to confirm.XPress the : or 9 button to select the
Limit speed (winter tyres): function.
You will see the current setting.XPress a to confirm.XPress the : or 9 button to adjust
permanent SPEEDTRONIC in increments of
ten ( 240 km/h to 160 km/h ). The Off set-
ting switches permanent SPEEDTRONIC
off.XPress the a button to store the entry.
Using the Speed limit (winter tyres)
function, you can set permanent SPEED-
TRONIC ( Y page 173).
Switching the automatic locking feature
on/off
XPress the = or ; button on the steer-
ing wheel to select the Settings menu.XPress the : or 9 button to select the
Vehicle submenu.XPress a to confirm.XPress the : or 9 button to select the
Auto. door lock function.
When the Auto. door locks function is
activated, the vehicle doors are displayed
in red in the multifunction display.XPress the a button to save the setting.If you select the Auto. door locks function,
the vehicle is centrally locked above a speed
of around 15 km/h.
i For further information on the automatic
locking feature; see ( Y page 83).
Activating/deactivating the acoustic
locking confirmation
If you switch on the Acoustic Lock function,
an acoustic signal sounds when you lock the
vehicle.XPress the = or ; button on the steer-
ing wheel to select the Settings menu.XPress the : or 9 button to select the
Vehicle submenu.XPress a to confirm.XPress the : or 9 button to select the
Acoustic Lock function.
If the Acoustic Lock function is activated,
the & symbol in the multifunction dis-
play lights up red.XPress the a button to save the setting.
Activating/deactivating the radar sensor
system
XPress the = or ; button on the steer-
ing wheel to select the Settings menu.XPress the : or 9 button to select the
Vehicle submenu.XPress a to confirm.XPress the 9 or : button to select
Radar sensor (See Owner's Man.) .
You will see the selected setting: on or
off .XPress the a button to save the setting.
Heating
Changing the departure time
XPress the = or ; button on the steer-
ing wheel to select the Settings menu.XPress the : or 9 button to select
the Heating submenu.Menus and submenus223On-board computer and displaysZProCarManuals.com

Display messagesPossible causes/consequences and M SolutionsJ
Check brake fluid
levelThere is insufficient brake fluid in the brake fluid reservoir.
In addition, the red J warning lamp lights up in the instrument
cluster and a warning tone sounds.GWARNING
The braking efficiency 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 ( Y page 162).XConsult a qualified specialist workshop.XDo not top up the brake fluid. This does not correct the fault.#
Check brake pad
wearThe brake pads/linings have reached their wear limit.XVisit a qualified specialist workshop.PRE-SAFE
inoperative See
Owner's ManualImportant functions of PRE-SAFE ®
have failed. All other occupant
safety systems, e.g. airbags, remain available.XVisit a qualified specialist workshop immediately.Collision Preven‐
tion Assist Plus
currently unavail‐
able See Owner's
ManualCOLLISION PREVENTION ASSIST PLUS is temporarily inoperative.
Possible causes:
R the radar sensor cover in the radiator trim is dirty.
R the function is impaired due to heavy rain or snow.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out.
COLLISION PREVENTION ASSIST PLUS is operational again.
If the display message does not disappear:XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.XSecure the vehicle against rolling away ( Y page 162).XClean the radar sensor cover in the radiator grille
( Y page 291).XRestart the engine.Display messages233On-board computer and displaysZProCarManuals.com

Display messagesPossible causes/consequences and M SolutionsCollision Preven‐
tion Assist Plus
inoperativeCOLLISION PREVENTION ASSIST PLUS is malfunctioning. The dis-
tance warning signal may also have failed.XVisit a qualified specialist workshop.PRE-SAFE
Function currently
limited See Own‐
er's ManualAdaptive Brake Assist is temporarily inoperative. Possible causes:
R the front bumper is dirty.
R the function is impaired due to heavy rain or snow.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out.
Adaptive Brake Assist is operational again.
If the display message does not disappear:XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.XSecure the vehicle against rolling away ( Y page 162).XClean the front bumper ( Y page 291).XRestart the engine.PRE-SAFE
Function limited
See Owner's ManualAdaptive Brake Assist is faulty. The distance warning signal may
also have failed.XVisit a qualified specialist workshop.üIf the symbol appears in the multifunction display, a seat belt
tongue has been inserted into a rear seat belt buckle.
Further information on the status indicator for the rear seat belts
( Y page 49).234Display messagesOn-board computer and displays
ProCarManuals.com

Display messagesPossible causes/consequences and M Solutionsb
Reversing lightThe reversing lamp is faulty.XCheck whether you are permitted to replace the bulb yourself
( Y page 114).
or
XVisit a qualified specialist workshop.b
Left tail lamp  or 
Right tail lamp The left or right-hand tail lamp is faulty.XCheck whether you are permitted to replace the bulb yourself
( Y page 114).
or
XVisit a qualified specialist workshop.b
Left daytime driv‐
ing lamp  or Right
daytime driving
lampThe left-hand or right-hand daytime driving lamp is faulty.XCheck whether you are permitted to replace the bulb yourself
( Y page 114).
or
XVisit a qualified specialist workshop.b
Intell. Light Sys‐
tem inoperativeThe Intelligent Light System is faulty. The lights remain available
without the Intelligent Light System.XVisit a qualified specialist workshop.b
Malfunction See
Owner's ManualThe exterior lighting is faulty.XVisit a qualified specialist workshop.Vehicles with trailer tow hitch: a fuse may have blown.XCheck the fuses ( Y page 312).XIf necessary, replace the blown fuse. Observe the warning notes
as you do so.
If the display message continues to be displayed:
XVisit a qualified specialist workshop.b
AUTO lights inoper‐
ativeThe light sensor is faulty.XVisit a qualified specialist workshop.b
Switch off lightsThe lights are still switched on when you leave the vehicle. A
warning tone also sounds.XTurn the light switch to Ã.Display messages239On-board computer and displaysZProCarManuals.com

Display messagesPossible causes/consequences and M SolutionsSpeed Limit Assist
currently unavail‐
able See Owner's
ManualSpeed Limit Assist is deactivated and temporarily inoperative.
Possible causes:
R the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.XClean the windscreen.
If the system detects that the camera is fully operational, the dis-
play message disappears.
Speed Limit Assist is operational again.
Speed Limit Assist:
Unavailable in
this countrySpeed Limit Assist is only available in certain countries.XDrive on.
Speed Limit Assist is available again as soon as you drive into a
country in which its use is approved.Speed Limit Assist
inoperativeSpeed Limit Assist is faulty.XVisit a qualified specialist workshop.ë
OffThe HOLD function is deactivated. The vehicle is skidding.
A warning tone also sounds.XReactivate the HOLD function later ( Y page 181).The HOLD function is deactivated. When the brake pedal is firmly
depressed, an activation condition is not fulfilled.
A warning tone also sounds.XCheck the activation conditions for the HOLD function
( Y page 181).Radar sensor deac‐
tivated See Own‐
er's ManualThe radar sensor system is deactivated.XSwitch on the radar sensor system ( Y page 223).Display messages243On-board computer and displaysZProCarManuals.com

Display messagesPossible causes/consequences and M SolutionsBlind Spot Assist is temporarily inoperative. Possible causes:
R the sensors are dirty.
R the function is impaired due to heavy rain or snow.
R the radar sensor system is outside the operating temperature
range.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
The yellow 9 indicator lamps also light up in the exterior mir-
rors.
Once the causes listed above no longer apply, the display message
goes out.
Blind Spot Assist is operational again.
If the display message does not disappear:XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.XSecure the vehicle against rolling away ( Y page 162).XClean the sensors ( Y page 291).XRestart the engine.Blind Spot Assist
inoperativeBlind Spot Assist is faulty.
The yellow 9 indicator lamps also light up in the exterior mir-
rors.XVisit a qualified specialist workshop.Park Assist cancel‐
ledThe driver's door is open and the driver's seat belt has not been
fastened.XRepeat the parking process with the seat belt fastened and the
driver's door closed.You inadvertently touched the multifunction steering wheel while
steering intervention was active.XWhile steering intervention is active, make sure not to touch the
multifunction steering wheel.The vehicle has started to skid and ESP ®
has intervened.XUse Active Parking Assist again later ( Y page 186).Display messages245On-board computer and displaysZProCarManuals.com