2015 MERCEDES-BENZ CLA-Class ESP inoperative

Driving safety systems
Overview of driving safety systems
In this section, you will find information about the following driving safety systems:
R ABS (Anti-lock BrakingSystem)
(Y page 63)
R BAS (Brake Assist System) (Y page 64)
R COLLISION PREVENTION ASSIST PLUS
(Y page 64)
R ESP ®
(Electronic StabilityProgram)
(Y page 67)
R EBD (Electronic Brake forceDistribution)
(Y page 70)
R ADAPTIVE BRAKE (Y page 70)
R STEER CONTROL (Y page 70) Important safety notes
If you fail to adapt your driving style or if you
are inattentive, the driving safety systems can
neither reduce the risk of an accident nor
override the laws of physics. Driving safety
systems are merely aids designed to assist
driving. You are responsible for maintaining
the distance to the vehicle in front, for vehicle speed, for braking in good time, and for stay-ing in lane. Always adapt your driving style to
suit the prevailing road and weather condi-
tions and maintain a safe distance from the
vehicle in front. Drive carefully.
The driving safety systems described only
work as effectively as possible when there is
adequate contact between the tires and the
road surface. Please pay special attention to
the notes on tires, recommended minimum
tire tread depths, etc. (Y page 318).
In wintry driving conditions, always use winter
tires (M+S tires) and if necessary, snow
chains. Only in this way will the driving safety systems described in this section work as
effectively as possible. ABS (Anti-lock Braking System)
General information ABS regulates brake pressure in such a way
that the wheels do not lock when you brake.
This allows you to continue steering the vehi-
cle when braking.
The ! ABS warning lamp in the instrument
cluster lights up when the ignition is switched on. It goes out when the engine is running.
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 63). G
WARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally, further 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 a qualified 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 250) and
display messages which may be shown in the
instrument cluster (Y page 218).
ABS works from a speed of about 5 mph
(8 km/ h), regardless of road-surface condi-
tions. ABS works on slippery surfaces, even
when you only brake gently.
Braking X
If ABS intervenes: continue to depress the
brake pedal vigorously until the braking sit- uation is over.
X To make a full brake application:
depress the brake pedal with full force.
If ABS intervenes when braking, you will feel a pulsing in the brake pedal. Driving safety systems
63Safety Z

Safety systems
Display messages
Possible causes/consequences and
M
MSolutions !÷
Currently Unavail‐ Currently Unavail‐
able See Opera‐ able See Opera‐
tor's Manual tor's Manual ABS (Anti-lock Braking System), BAS (Brake Assist), ESP
®
(Elec-
tronic Stability Program), the HOLD function and hill start assist
are temporarily unavailable.
COLLISION PREVENTION ASSIST PLUS may also have failed.
In addition, the !,÷andå warning lamps may light up
in the instrument cluster.
ATTENTION ASSIST is deactivated.
Possible causes are:
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 stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Carefully 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: X Drive on carefully.
X Visit a qualified specialist workshop. !÷
Inoperative See Inoperative See
Operator's Manual Operator's Manual ABS, BAS, ESP
®
, the HOLD function and hill start assist are not
available due to a malfunction.
COLLISION PREVENTION ASSIST PLUS may also have failed.
The !, ÷,åand$ (USA only)/J (Canada only)
warning lamps in the instrument cluster may also light up.
ATTENTION ASSIST is deactivated.
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. 218
Display messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions ÷
Inoperative See Inoperative See
Operator's Manual Operator's Manual ESP
®
, BAS, the HOLD function and hill start assist are unavailable
due to a malfunction.
COLLISION PREVENTION ASSIST PLUS may also have failed.
In addition, the ÷andå warning lamps may light up in the
instrument cluster.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to 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.
X Drive on carefully.
X Visit a qualified specialist workshop. T!
÷
Inoperative See Inoperative See
Operator's Manual Operator's Manual EBD (electronic brake force distribution), ABS, BAS, ESP
®
, the
HOLD function and hill start assist are not available due to a mal- function.
COLLISION PREVENTION ASSIST PLUS may also have failed.
A warning tone sounds.
In addition, the ÷,åand! warning lamps may light up
in the instrument cluster.
G WARNING
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 affec-ted. 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.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. 220
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions $(USA
only)J
(Canada
only)
Check Brake Fluid Check Brake Fluid
Level Level There is not enough brake fluid in the brake fluid reservoir.
A warning tone sounds. The
$(USA only)/ J(Canada only)
warning lamps in the instrument cluster may also light up.
G WARNING
The braking effect may be impaired.
There is a risk 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 rolling away (Y page 160).
X Consult a qualified specialist workshop.
X Do not add brake fluid. This does not correct the malfunction. #
Check Brake Pad Check Brake Pad
Wear Wear The brake pads/linings have reached their wear limit.
X Visit a qualified specialist workshop. G
Inoperative
Inoperative One or more main features of the mbrace system are malfunc-
tioning.
X Have the mbrace system checked immediately at a qualified
specialist workshop. Collision Preven‐ Collision Preven‐
tion Assist Plus tion Assist Plus
Currently Unavail‐ Currently Unavail‐
able See Opera‐ able See Opera‐
tor's Manual tor's Manual COLLISION PREVENTION ASSIST PLUS is temporarily not opera-
tional.
Possible causes are:
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.
R AMG vehicles: ESP ®
is deactivated.
When the causes stated above no longer apply, the display mes-
sage disappears.
COLLISION PREVENTION ASSIST PLUS 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 160).
X Restart the engine.
X AMG vehicles: reactivate ESP ®
(Y page 68). 224
Display
messagesOn-board computer and displays

Tires
Display messages
Possible causes/consequences and
M
MSolutions Check Tire Pres‐
Check Tire Pres‐
sure Soon sure Soon Canada only:
The tire pressure loss warning system has detected a significant
loss in pressure.
A warning tone also sounds.
Possible causes:
R you have changed the positions of the wheels and tires or instal-
led new wheels and tires.
R the tire pressure in one or more tires is not correct.
G WARNING
Tire pressures that are too low pose the following hazards:
R they may burst, especially as the load and vehicle speed
increase.
R they may wear excessively and/or unevenly, which may greatly
impair tire traction.
R the driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
X Secure the vehicle against rolling away (Y page 160).
X Check the tires and, if necessary, follow the instructions for a
flat tire (Y page 300).
X Check the tire pressures and, if necessary, correct the tire pres-
sure.
X Restart the tire pressure loss warning system when the tire
pressure is correct (Y page 326).Check Tire Pres‐ Check Tire Pres‐
sure Then Restart sure Then Restart
Run Flat Indicator Run Flat Indicator Canada only:
The tire pressure loss warning system generated a display mes-
sage and has not been restarted since.
X Set the correct tire pressure in all four tires.
X Restart the tire pressure loss warning system (Y page 326).Run Run
Flat
Flat Indicator
Indicator
inoperative
inoperative Canada only:
The tire pressure loss warning system is faulty.
X Visit a qualified specialist workshop. Display
messages
239On-board computer and displays Z

X
Lift up the cover of socket :.mbrace
General notes The mbrace system is only available in the
USA.
You must have a license agreement to acti-
vate the mbrace service. Make sure that your system is activated and operational. To log in,
press the ïMB Info call button. If any of
the steps mentioned are not carried out, the
system may not be activated.
If you have questions about the activation,
contact one of the following telephone hot-
lines:
Mercedes-Benz Customer Assistance Center
at 1-800-FOR-MERCedes (1-800-367-6372)
or 1-866-990-9007
Shortly after successfully registering with the
mbrace service, a user ID and password will
be sent to you by mail. You can use this pass-
word to log onto the mbrace area under "Own-
ers Online" at http://www.mbusa.com.
The system is available if:
R it has been activated and is operational
R the corresponding mobile phone network is
available for transmitting data to the Cus-
tomer Center
R a service subscription is available
R the starter battery is sufficiently charged
Determining the location of the vehicle on a
map is only possible if:
R GPS reception is available.
R the vehicle position can be forwarded to
the Customer Assistance Center. The mbrace system To adjust the volume during a call, proceed as
follows:
X Press the WorX button on the mul-
tifunction steering wheel.
or
X Use the COMAND/Audio 20 volume con-
trol.
The system offers various services, e.g.:
R Automatic and manual emergency call
R Roadside Assistance call
R MB Info call
You can find information and a description of all available features under "Owners Online"
at http://www.mbusa.com.
System self-test After you have switched on the ignition, the
system carries out a self-diagnosis.
A malfunction in the system has been detec-
ted if one of the following occurs:
R The indicator lamp in the SOS button does
not come on during the system self-test.
R The indicator lamp in the FRoadside
Assistance button does not light up during
self-diagnosis of the system.
R The indicator lamp in the ïMB Info call
button does not light up during self-diag-
nosis of the system.
R The indicator lamp in one or more of the
following buttons continues to light up red
after the system self-diagnosis:
- SOS button
- F Roadside Assistance call button
- ï MB Info call button
R The Inoperative Inoperative or theService Not
Service Not
Activated
Activated message appears in the multi-
function display after the system self-diag-
nosis.
If a malfunction is indicated as outlined
above, the system may not operate as expec-
ted. In the event of an emergency, help will
have to be summoned by other means. 272
FeaturesStowage and features