2014 MERCEDES-BENZ B-CLASS SPORTS Owners Manual

Safety systems
Problem Possible causes/consequences and
000B Solutions
0004
(USA only)
0001 (Canada only)
The red brake system
warning lamp comes on
while the engine is
running. Awarning tone
also sounds. There is not enough brake fluid in the brake fluid reservoir.
G WARNING
The braking effect 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 rolling away (Y page 152).
X Do not add brake fluid. Adding more will not remedy the
malfunction.
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. 001C
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.
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
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.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop.
If the ABS control unit is faulty, there is also apossibility that other
systems, such as the navigation system or the automatic
transmission, will not be available. Warning and indicator lampsint
he instrument cluster
239On-board computer and displays Z

Problem Possible causes/consequences and
000B Solutions
001C
The yellowA
BS warning
lamp is lit while the
engine is running. ABS is temporarily unavailable. BAS,C
OLLISION PREVENTION
ASSIST, COLLISION PREVENTION ASSIST PLUS, ESP ®
,E BD
(electronic brake force distribution), the HOLD function and hill
start assist, for example, are therefore also deactivated.
Possible causes are:
R self-diagnosis is not yet complete.
R the on-board voltage may be insufficient.
ATTENTION ASSIST is deactivated.
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
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 arisk of an accident.
X Carefullyd riveasuitable distance, making slight steering
movementsatas peed 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:
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. 240
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
000B Solutions
001C
The yellowA
BS warning
lamp is lit while the
engine is running. A
warning tone also
sounds. EBD is malfunctioning. Therefore, ABS,B
AS,COLLISION
PREVENTION ASSIST, COLLISION PREVENTION ASSIST PLUS,
ESP ®
,t he HOLD function and hill start assist, for example, are not
available either.
ATTENTION ASSIST is deactivated.
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
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.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. 0004
(USA only)
0001 (Canada only)
000A0004001C
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,C OLLISION
PREVENTION ASSIST, COLLISION PREVENTION ASSIST PLUS,
EBD,t he HOLD function and hill start assist, for example, are not
available either.
ATTENTION ASSIST is deactivated.
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
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.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. Warning and indicator lampsint
he instrument cluster
241On-board computer and displays Z

Problem Possible causes/consequences and
000B Solutions
000A
The yellowE
SP®
warning lamp flashes
while the vehicle is in
motion. ESP
®
or traction control has intervened because there is arisk of
skidding or at least one wheel has started to spin.
Cruise control or DISTRONIC PLUS is deactivated.
X When pulling away,o nly depress the accelerator pedal as far as
necessary.
X Ease off the accelerator pedal while the vehicle is in motion.
X Adapt your driving style to suit the road and weather conditions.
X Do not deactivate ESP ®
.
For exceptions, see: (Y page 68).0004
The yellowE
SP®
OFF
warning lamp is lit while
the engine is running. ESP
®
and ESP ®
trailer stabilization are deactivated. ESP ®
will not
stabilize the vehicle if it starts to skid or if awheel starts to spin.
G WARNING
If ESP ®
is switched off, ESP ®
is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Reactivate ESP ®
.
For exceptions, see: (Y page 68).
X Adapt your driving style to suit the road and weather conditions.
If ESP ®
cannot be activated:
X Have ESP ®
checked at aqualified specialist workshop. 000A0004
The yellow ESP
®
and
ESP ®
OFF warning
lamps are lit while the
engine is running. ESP
®
,B AS,C OLLISION PREVENTION ASSIST, COLLISION
PREVENTION ASSIST PLUS, the HOLD function and hill start assist
are not available due to amalfunction.
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 Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. 242
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
000B Solutions
000A0004
The yellowE
SP®
and
ESP ®
OFF warning
lamps are lit while the
engine is running. ESP
®
,B AS,t he HOLD function and hill start assist are temporarily
unavailable.
COLLISION PREVENTION ASSIST/COLLISION PREVENTION
ASSIST PLUS may also have failed.
ATTENTION ASSIST is deactivated.
self-diagnosis is not yet complete.
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 Carefullyd riveasuitable distance, making slight steering
movementsatas peed 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:
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. Warning and indicator lampsint
he instrument cluster
243On-board computer and displays Z

Problem Possible causes/consequences and
000B Solutions
0005
(USA only)
000A (Canada only)
The red indicator lamp
for the electric parking
brake flashes or lights
up and/or the yellow
warning lamp for the
electric parking brake
lights up. X
Observe the additional display messages in the multifunction
display. 0021
The red SRS warning
lamp is lit while the
engine is running.
There is
amalfunction in the SRS (Supplemental Restraint
System).
G WARNING
The air bags or Emergency Tensioning Devices may either be
triggered unintentionally or, in the event of an accident, may not
be triggered.
There is an increased risk of injury.
X Drive on carefully.
X Have SRS checked at aqualified specialist workshop
immediately.
For further information about SRS, see (Y page 40).244
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Engine
Problem Possible causes/consequences and
000B Solutions
000A
The yellow Check
Engin
ewarning lamp
light supw hile the
engin eisrunning. Ther
emay be amalfunction, for example:
R in th eenginem anagement
R in th efuel injection system
R in th eexhaust system
R in th eignition system
R in th efuel system
The emission limit values may be exceeded and th eenginem ay
be runnin ginemergenc ymode.
X Hav ethe vehicle checked as soon as possible at aqualified
specialist workshop.
i In som estates, you must immediately visit aqualified
specialist worksho passoon as th eyellow Chec kEngine warning
lamp lights up .This depends on the locally applicable legal
requirements. If in doubt, check whether such legal regulations
apply in the state in which you are currently driving. 0007
The yellow reserve fuel
warning lamp lights up
while the engine is
running.
The fuel level has dropped into the reserve range.
X
Refuel at the nearest gas station. 0007
The yellow reserve fuel
warning lamp flashes
while the engine is
running.
The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
X
Check that the fuel filler cap is correctly closed.
X If the fuel filler cap is not correctly closed: close the fuel filler
cap.
X If the fuel filler cap is closed: visitaqualified specialist
workshop. 0010
The red coolant
warning lamp lights up
while the engine is
running and the coolant
temperature gage is at
the start of the scale.
The temperature sensor for the coolant temperature gage is
defective.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
X Secure the vehicle against rolling away (Y page 152).
X Consult aqualified specialist workshop. Warning and indicator lampsint
he instrument cluster
245On-board computer and displays Z

Problem Possible causes/consequences and
000B Solutions
0010
The red coolant
warning lamp comes on
while the engine is
running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator
may be blocked or the electric engine radiator fan may be
malfunctioning.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
Observe the additional display messages in the multifunction
display.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 152).
X Leave the vehicle and keep asafe distance from the vehicle until
the engine has cooled down.
X Check the coolant level and add coolant (Y page 283). Observe
the warning notes.
X If you need to add coolant more often than usual, have the
engine coolant system checked.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Do not start the engine again until the coolant temperature is
under 248 ‡(120 †). Otherwise ,the engine coul dbedamaged.
X Drive to the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in
mountainou sterrain, and stop-and-go traffic. 0010
The red coolant
warning lamp comes on
while the engine is
running.
Awarning tone
also sounds. The coolant temperature has exceeded 248
‡(120 †). The
airflow to the engine radiator may be blocked or the coolant level
may be too low.
G WARNING
The engine is not being coole dsufficiently and may be damaged.
Do not drive whe nyour engine is overheated. This can cause some
fluids which may have leaked into the engine compartment to
catchf ire.
Vapor from the overheated engine can also cause serious burns
which can occur just by opening the hood.
There is arisk of injury.
X Observe the additional display messages in the multifunction
display.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 152).246
Warning and indicator lampsint
he instrument clusterOn-board computer and displays