2012 MERCEDES-BENZ CLS COUPE brake

When PRE-SAFE
®
Brak eisa ctivated, the mul-
tifunction display shows the Äsymbol as
long as the HOLD function is not activated
(Y page 179).
Vehicles with Active Parking Assist: if
PARKTRONIC is activated and you are driving
at as peed under 35 km/h, the jActive
Parking Assist symbol is shown instead of the
Ä symbol ( Ypage 187).
If the PRE-SAFE Brake: Sensors deacti‐ vated message appears, the radar sensor
system is deactivated.
X Check whether or not the radar sensor sys-
tem may be activated (Y page 368).
X Activate the radar sensor system
(Y page 225).
For more information on PRE-SAFE ®
Brake,
see (Y page 68).
Activating/deactivating ATTENTION
ASSIST X
Press the =or; button on the steer-
ing wheel to select the Assist. menu.
X Press the 9or: button to select
Attentio nAssist .
X Press the abutton.
The curren tselection is displayed.
X To activate/deactivate: press thea
button again.
When ATTENTION ASSISTisa ctivated, the
À symbol appears in the multifunction
display when the ignition is on.
For further information about ATTENTION
ASSIST, see (Y page 192).
Activating/deactivating Blind Spot
Assist X
Press the =or; button on the steer-
ing wheel to select the Assist. menu.
X Press the 9or: button to select
Blind Spot Asst. .X
Press the abutton.
The curren tselection is displayed.
X To activate/deactivate: press thea
button again.
If the Blind Spot Assist Sensors deac‐ tivated or
Active blind spot assist. sensor system deactivated message
appears, the radar sensor system is deacti-
vated.
X Check whether or not the radar sensor sys-
tem may be activated (Y page 368).
X Activat ethe radar sensor system
(Y page 225).
For further information about Blind Spot
Assist ,see (Y page 197).
For further information about Active Blind
Spot Assist ,see (Y page 201).
Activating/deactivating Lane Keeping
Assist X
Press the =or; button on the steer-
ing wheel to select the Assist. menu.
X Press the 9or: button to select
Lane Keep. Asst. X
Press the abutton.
The curren tselection is displayed.
X Press ato confirm.
When Lane Keeping Assist or Active Lane
Keeping Assist is activated, the Ãsymbol
appears in the multifunction display when the
ignition is on.
For further information about Active Lane
Keeping Assist ,see (Y page 204). Service menu220
Menus and submenusOn-boar
dcomputer and displays

Switching the automatic locking feature
on/off
X
Press the =or; button on the steer-
ing wheel to select the Settings menu.
X Press the :or9 button to select the
Vehicle submenu.
X Press ato confirm.
X Press the :or9 button to select the
Auto. door locks function.
When the Automatic door locks func-
tion is activated, the vehicle doors are dis-
played in red in the multifunction display.
X Press the abutton to save the setting.
If you activate the Automatic door locks function, the vehicle is centrally locked above
as
peed of around 15 km/h.
For further information on the automatic lock-
ing feature, see (Y page 84).
Activating/deactivating the acoustic
locking confirmation
If you switch on the Acoustic Lock function,
an acoustic signal sounds when you lock the
vehicle.
X Press the =or; button on the steer-
ing wheel to select the Settings menu.
X Press the :or9 button to select the
Vehicle submenu.
X Press ato confirm.
X Press the :or9 button to select the
Acoustic Lock function.
If the Acoustic Lock function is activated,
the & symbol in the multifunction dis-
play lights up red.
X Press the abutton to save the setting.
Activating/deactivating the radar sensor
system
X Press the =or; button on the steer-
ing wheel to select the Settings menu.
X Press the :or9button to select the
Vehicle submenu.
X Press ato confirm. X
Press the 9or: button to select
Radar sensor (See Owner's Man.): .
You will see the selected setting: on or
off .
X Press the abutton to save the setting.
i You must deactivate the radar sensor sys-
tem in certain countries and near radio
telescope facilities. For further informa-
tion, see (Y page 368).
When you are close to radio telescope facili-
ties, the radar sensor system will be deacti-
vated automatically.
The following systems are switched off when
the radar sensor system is deactivated:
R DISTRONIC PLUS (Y page 170)
R BAS PLUS (Y page 64)
R PRE-SAFE ®
Brake (Y page 68)
R Blind Spot Assist (Y page 197)
R Active Blind Spot Assist (Y page 201)
Heating Auxiliary heating departuret
ime G
WARNING
Exhaust fumes are produced when the auxili-
ary heating is in operation. Inhaling these
exhaust fumes can be poisonous. You should
therefore switch off the auxiliary heating in
confined spaces without an extraction sys-
tem, e.g. agarage. G
WARNING
When operating the auxiliary heating parts of
the vehicle can get very hot. Make sure that
the exhaust system does not under any cir-
cumstances come into contact with easily
ignitable material such as dry grass or fuels.
The material could otherwise ignite and set
the vehicle alight. Choose your parking spot
accordingly.
Operating the auxiliary heating is thus pro-
hibited at filling stations or when your vehicle
is being refuelled. You must therefore switch
off the auxiliary heating at filling stations. Menus and submenus
225On-board computer and displays Z

Safety systems
Display messages Possible causes/consequences and
M Solutions
!÷
currently unavail‐
able See Owner's
Manual ABS (Anti-lock Braking System), ESP
®
(Electronic Stability Pro-
gram), BAS (Brake Assist), PRE-SAFE ®
,t he HOLD function and hill
start assist are temporarily unavailable.
The adaptive brake lights, BAS PLUS and PRE-SAFE ®
Brake may
also have failed.
In addition, the ÷,åand! warning lamps light up in
the instrumen tcluster.
ATTENTION ASSIST is deactivated.
Possible causes:
R self-diagnosis is not yet complete.
R the on-board voltage may be insufficient.
G WARNING
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 affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Carefullyd rive onasuitable stretch of road, making slight steer-
ing movementsatas peed above 20 km/h.
If the display message disappears, the functions mentioned
above are available again.
If the display message continues to be displayed:
X Drive on carefully.
X Visit aqualified specialist workshop. !÷
inoperative See
Owner's Manual ABS,E
SP®
,B AS ,PRE-SAFE ®
,t he HOLD function and hill start
assist are unavailable due to amalfunction.
The adaptive brake lights, BAS PLUS and PRE-SAFE ®
Brake may
also have failed.
In addition, the J,÷,åand! warning lamps light
up in the instrumen tcluster.
ATTENTION ASSIST is deactivated.
G WARNING 232
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
The brak
esystem continues to function normally, but without the
function slisted above. The wheels could therefore loc kifyou
brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergenc ybraking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Drive on carefully.
X Visit aqualified specialist workshop immediately. ÷
inoperative See
Owner's Manual ESP
®
,B AS, PRE-SAFE ®
,t he HOLD functio nand hill start assist are
unavailable du etoamalfunction.
The adaptive brake lights ,BAS PLU Sand PRE-SAFE ®
Brake may
also have failed.
In addition, the ÷andå warning lamps light up in the
instrument cluster.
The self-diagnosi sfun ctio nm ay no tbec omplete, for example.
ATTENTION ASSISTisd eactivated.
G WARNING
The brake system continues to function normally, but without the
function slisted above.
The brakin gdistanc einane mergency brakin gsituation can thus
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an acciden tincreases.
X Carefully drive on asuitabl estretch of road, making slight steer-
ing movements at aspeed above 20 km/h.
If the display message disappears, the functions mentioned
above ar eavailable again.
If the display message continue stobedisplayed:
X Driv eonc arefully.
X Visi taq ualified specialist workshop. Display messages
233On-boardcomputer and displays Z

Display messages Possible causes/consequences and
M Solutions
T!
÷
inoperative See
Owner'
sManual EB
D( electronic brak eforce distribution), ABS, ESP ®
,B AS ,PRE-
SAFE ®
,t he HOLD function and hill start assist are unavailable due
to am alfunction.
The adaptive brak elights ,BAS PLU Sand PRE-SAFE ®
Brake may
also hav efailed.
In addition ,the ÷ ,å and! warnin glamp sligh tupin
the instrument cluster and awarning ton esounds.
G WARNING
The brake system continues to function normally, but without the
function slisted above. The fron tand rea rwheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Drive on carefully.
X Visit aqualified specialist workshop immediately. J
Release parking
brake You are driving with the parking brake applied.
Awarning tone also
sounds.
X Release th eparking brake. J
Check brake fluid
level Ther
eisi nsufficient brak efluid in the brak efluid reservoir.
In addition, the red Jwarnin glamp light supinthe instrument
cluster and awarnin gtones ounds.
G WARNING
The braking efficiency may be impaired.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible ,paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Secure the vehicle against rollin gaway (Y page 159).
X Consult aqualified specialist workshop.
X Do not top up the brak efluid. This does not correc tthe error. #
Chec
kbrakep ad wear The brak
epads/linings have reached their wear limit.
X Visit aqualified specialist workshop. 234
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
PRE-SAFE
inoperative See
Owner'
sManual Importan
tfunction sofPRE-SAFE ®
have failed .All other occupant
safet ysystems, e.g. airbags, remain available.
X Visit aqualified specialist workshop immediately. PRE-SAFE
Function
scur‐ rently limited See
Owner's Manual PRE-SAFE
®
Brake is temporarily inoperative. Possible causes:
R the function is impaired due to heavy rain or snow.
R the sensors in the radiator trim and in the bumper sare dirty.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tion soro ther sources of electromagnetic radiation.
R AMG vehicles: ESP ®
is deactivated.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
Onc ethe causes listed above no longer apply, the display message
goes out.
PRE-SAFE ®
Brake is operational again.
If the display message does not disappear:
X Pull over and stop the vehicle safely as soon as possible ,paying
attention to road and traffic conditions.
X Secure the vehicle against rollin gaway (Y page 159).
X Clean the sensors in the radiator trim and in the bumpers
(Y page 304).
X Restar tthe engine.
X AMG vehicles: reactivate ESP ®
(Y page 66). PRE-SAFE
Functions cur‐
rently limited See
Owner's Manual PRE-SAFE
®
Brake is inoperative due to afault. BAS PLUS or the
distance warning signal may also have failed.
X Visit aqualified specialist workshop. ü If the symbol appears in the multifunction display,
aseat belt
tongue has been inserted intoar ear seat belt buckle.
For further information on the status indicator for the rear seat
belts: (Y page 51). Display messages
235On-boardcomputer and displays Z

Display messages Possible causes/consequences and
M Solutions
b
Rea
rl efti ndica‐ tor or
Rea rr ight indicator The rear left-han
dorrear right-hand tur nsignal is faulty.
X Check whether you are permitted to replac ethe bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Fron
tleft indica‐ tor or
Fron tright indicator The front left-han
dorfront right-han dturns ignal is faulty.
X Check whether you are permitted to replac ethe bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Left
mirror indica‐
tor or
Righ tmir‐ ror indicator The tur
nsignal in the left-han dorright-han dexterior mirror is
faulty.
X Check whether you are permitted to replac ethe bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Thir
dbrakel amp The thir
dbrak elamp is faulty.
X Check whether you are permitted to replac ethe bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Left-han
dtail lamp/brake
lamp orRight-hand
tail lamp/brake
lamp The left or right-han
dtail lamp/brak elamp is faulty.
X Check whether you are permitted to replac ethe bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Left main
beam orRight main
beam The left or right-han
dhigh beam is faulty.
X Check whether you are permitted to change the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. 238
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
ë
off The HOLD function is deactivated. The vehicl
eisskidding.
Aw arning tone also sounds.
X Reactivat ethe HOLD function late r(Ypage 179). Radar sensor deac‐
tivate
dSee Own‐ er'
sM anual The radar sensor system is deactivated.
X
Chec kwhether or not the radar sensor system may be activated
(Y page 368).
X Activate the radar sensor system (Y page 225).Radar sensor deac‐
tivated autom. See
Owner's Manual Vehicles with
anavigation system: the vehicle is close to aradio
telescope facility and is therefore prohibited from transmitting any
radar signals. The radar sensor system has switched off automat-
ically (Y page 368).
If DISTRONIC PLUS was activated, it is no longer available. A
warning tone also sounds.
If Active Blind Spot Assist was activated, it is no longer available.
The yellow 9indicator lamps also light up in the exterior mir-
rors.
BAS PLUS (Brake Assist PLUS) and PRE-SAFE ®
Brake are then also
unavailable.
X Drive on.
Once you have moved far enough away from the radio telescope,
the above functions are available again. Vehicles with Becker
®
MAP PILOT: if the Becker ®
MAP PILOT is
not connected, the radar sensor system is deactivated automati-
cally.
BAS PLUS, DISTRONIC PLUS, Active Blind Spot Assist and
PRE-SAFE ®
brake are unavailable.
X Connect the Becker ®
MAP PILOT; see the separate operating
instructions. Display messages
245On-board computer and displays Z