2012 MERCEDES-BENZ CLS COUPE ESP inoperative

neither reduce the ris
kofaccident nor over-
rid ethe laws of physics .Driving safety sys-
tems are merel yaidsd esigned to assist driv-
ing. You are responsible for the distance to
the vehicl einfront, for vehicl espee dand for
braking in good time. Always adapt yourd riv-
ing style to suitt he prevailing road and
weather conditionsa nd maintainasafe dis-
tance from the vehicle in front.D rive care-
fully.
i The driving safety systems described only
work as effectively as possible when there
is adequate contact between the tyres and
the road surface. Please pay special atten-
tion to the notes on tyres, recommended
minimum tyre tread depths, etc.
(Y page 328).
In wintry driving conditions, always use
winter tyres (M+S tyres) and, if necessary,
snow chains. Only in this way will the driv-
ing safety systems described in this section
work as effectively as possible. ABS (Anti-lockB
raking System)
Important safety notes i
Observe the "Important safety notes" sec-
tio n(Ypage 62). G
WARNING
If ABS is faulty, the wheels could lock when
braking .The steerability and braking charac-
teristics may be severely impaired. Addition-
ally,f urther driving safety systems are deac-
tivated. There is an increased danger of skid-
ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at aqualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp (Y page 261) and
displaym essages which may be shown in the
instrumentc luster (Ypage 232). ABS regulates brake pressure in such
away
that the wheels do not lock when you brake.
This allowsy ou to continue steering the vehi-
cle when braking.
ABS works from aspeed of about 8km/h
upwards, regardless of road-surface condi-
tions. ABS works on slippery surfaces, even
when you only brake gently.
The yellow !ABS warning lamp in the
instrumentc lusterlight supw hen the ignition
is switched on. It goes out when the engine is
running.
Brakes X
If ABS intervenes: continue to depressthe
brak epedal with force until the braking sit-
uation is over.
X To make afull brake application:
depres sthe brak epedal with full force.
If AB Sintervene swhenb raking ,you will feel
ap ulsi ng in the brake pedal.
The pulsating brake peda lcan be an indica-
tio nofh azardous road condition sand func-
tions as areminder to tak eextra carew hile
driving. BAS (Brak
eAssist System)
i Observ ethe "Important safety notes" sec-
tio n(Ypage 62). G
WARNING
If BA Sism alfunctioning, the braking distance
in an emergency braking situation is
increased. There is arisk of accident.
In an emergency braking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
BAS operates in emergency braking situa-
tions. If you depress the brake pedal quickly,
BAS automaticallyb oosts the braking force,
thus shortening the stopping distance.
The brakes will function as usualo nce you
release the brake pedal.B AS is deactivated. Dr
ivin gsafety systems
63Safety 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
Blind Spot Assis
torActive Blind Spot Assist is temporaril yinop-
erative .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 9indicator lamps also light up in the exterior mir-
rors.
Once the causes listed above no longer apply,t he display message
goes out.
Blind Spot Assist or Active Blind Spot Assist 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 rolling away (Y page 159).
X Clean the sensors (Y page 304).
X Restart the engine. Blind Spot Assist
inoperative or
Active Blind Spot Assist inoperative Blind Spot Assist or Active Blind Spot Assist is faulty.
The yellow
9indicator lamps also light up in the exterior mir-
rors.
X Visit aqualified specialist workshop. Park Assist cancel‐
led The driver's door is open and the driver's seat belt has not been
fastened.
X
Repeat the parking process with the seat belt fastened and the
driver's door closed. You have inadvertently touched the multifunction steerin
gwheel
while steerin gintervention was active.
X While steerin gintervention is active, make sure not to touch the
multifunction steerin gwheel. The vehicle has started to skid and ESP
®
has intervened.
X Use Active Parking Assist again later (Y page 187). Display messages
247On-board computer and displays Z

Tyres
Display messages Possible causes/consequence
sand M Solutions
Tyr
epressure Check tyres The tyr
epressure loss warnin gsystem ha sdetecte das ignificant
loss in pressure.
Aw arning tone also sounds.
G WARNING
Wit htyrep ressure swhicha re to olow, there is ariskoft he fol-
lowing hazards:
R the tyres may burst, especiallyast he load and vehicle speed
increase.
R the tyres may wear excessively and/or unevenly, which may
greatly impair tyre traction.
R the driving characteristics, as well as steering and braking, may
be greatly impaired.
There is arisk of an accident.
X Stop the vehicle without making any sudden steering or braking
manoeuvres. Pay attention to the traffic conditionsasy ou do
so.
X Secure the vehicle against rolling away (Y page 159).
X If there is aflat tyre, inspect the tyres (Y page 312).
X Check the tyre pressures and, if necessary, correct the tyre
pressure.
X Restart the tyre pressure loss warning system when the tyre
pressure is correct (Y page 333).Check tyre pres‐
sures
then restart Run
Flat Indicator The tyre pressure loss warning system generated
adisplaym es-
sage and has not been restarted since.
X Set the correct tyre pressure in all four tyres.
X Restart the tyre pressure loss warning system (Y page 333).Run Flat Indicator
inoperative The tyre pressure loss warning system is faulty.
X
Visit aqualified specialist workshop. Tyre pressure
displayed after
driving for
afew minutes The tyre pressure monitor is measuring the tyre pressure.
X
Driv eon.
The tyre pressures appear in the multifunction display after you
have been driving for afew minutes. Tyre press. monitor
inoperative The tyre pressure monitor is faulty.
X
Visit aqualified specialist workshop. 250
Display messagesOn-boar
dcomputer and displays

Display messages Possible causes/consequences and
M Solutions
Tyr
ep ress. moni‐ tor inoperative No
wheel sensors The wheels fitte
ddonot haveasuitable tyr epressure sensor .The
tyre pressure monitor is deactivated.
X Fit wheels with suitable tyre pressure sensors.
The tyre pressure monitor is activated automatically after driv-
ing for afew minutes. Check
tyres The tyre pressure in one or more tyres has dropped significantly.
The wheel position is displayed in the multifunction display.
Aw
arning tone also sounds.
G WARNING
Wit htyrep ressure swhicha re to olow, there is ariskoft he fol-
lowing hazards:
R the tyres may burst, especiallyast he load and vehicle speed
increase.
R the tyres may wear excessively and/or unevenly, which may
greatly impair tyre traction.
R the driving characteristics, as well as steering and braking, may
be greatly impaired.
There is arisk of an accident.
X Stop the vehicle without making any sudden steering or braking
manoeuvres. Pay attention to the traffic conditionsasy ou do
so.
X Secure the vehicle against rolling away (Y page 159).
X If there is aflat tyre, inspect the tyres (Y page 312).
X Check the tyre pressure (Y page 334).
X If necessary, correct the tyre pressure. Display messages
251On-board computer and displays Z