2015 MERCEDES-BENZ B-CLASS SPORTS Owners Manual

Display messagesPossible causes/consequences andMSolutions
Collision PrevenZ
tion Assist Plus
Inoperative
COLLISION PREVENTION ASSIST PLUS is temporarily inoperative
due to a malfunction. Adaptive Brake Assist may also have failed.
X Visit a qualified specialist workshop.
Radar Sensors
Dirty See OperaZ
tor's Manual
At least one of the following driving systems or driving safety sys-
tems is temporarily restricted or inoperative:
R COLLISION PREVENTION ASSIST PLUS
R DISTRONIC PLUS
Possible causes are:
R the sensors in the radiator trim and/or in the bumpers are dirty.
R the function of the driving system and/or driving safety system
is impaired due to heavy rain or snow.
A warning tone also sounds.
When the causes stated above no longer apply, the display mes-
sage disappears. All driving systems/driving safety systems are
operative 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 ( Ypage 152).
X Switch off the engine.
X Clean the sensors in the following locations ( Ypage 279):
R in the radiator trim
R in the front bumper
R in the rear bumper, particularly in the middle of the rear
bumper
X Restart the engine.
The display message disappears.
6
SRS Malfunction
Service Required
The restraint system is faulty. The 6warning lamp also lights
up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop.
For further information about the restraint system, see ( Y page 38).
Display messages215
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
6
FrontLeftMalfuncZ
tion Service
RequiredorFront
Right Malfunction
Service Required
The restraint system has malfunctioned at the front on the left or
right. The 6warning lamp also lights up in the instrument clus-
ter.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop.
6
Rear Left MalfuncZ
tion Service
RequiredorRear
Right Malfunction
Service Required
The rear left-hand or right-hand restraint system has malfunc-
tioned. The 6warning lamp also lights up in the instrument
cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop.
6
Rear Center MalZ
function Service
Required
The rear center restraint system has malfunctioned. The 6
warning lamp also lights up in the instrument cluster.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop.
6
Left Side Curtain
AirbagMalfunction
Service Required
orRight Side CurZ
tain Airbag MalZ
function Service
Required
There is a malfunction in the left-hand or right-hand window cur-
tain air bag. The 6warning lamp also lights up in the instrument
cluster.
GWARNING
The left or right window curtain air bag may either be triggered
unintentionally or, in the event of an accident, may not be trig-
gered.
There is an increased risk of injury.
X Visit a qualified specialist workshop.
216Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
Front Passenger
Airbag Disabled
SeeOperator'sManZ
ual
The front-passenger air bag is deactivated during the journey, even
though:
R an adult or
R a person of the corresponding stature is on the front-passenger
seat
If additional forces are applied to the seat, the system may inter-
pret the occupant's weight as lower than it actually is.
GWARNING
The front-passenger air bag does not deploy during an accident.
There is an increased risk of injury.
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 ( Ypage 152).
X Switch the ignition off.
X Have the occupant get out of the vehicle.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
X Observe the PASSENGER AIR BAG indicator lamps in the center
console and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the PASSENGER AIR BAG OFF and PASSENGER AIR BAG ON
indicator lamps must light up simultaneously for approx-
imately six seconds
R the PASSENGER AIR BAG OFF indicator lamp must then light
up and remain lit. If the indicator lamp is on, OCS has disabled
the front-passenger front air bag ( Ypage 47)
R the
FrontPassengerAirbagEnabledSeeOperator's
ManualorFrontPassengerAirbagDisabledSeeOperZ
ator's Manualdisplay messages must not be shown in the
multifunction display.
X Wait for a period of at least 60 seconds until the necessary sys-
tem checks have been completed.
X Make sure that the display messages do not appear in the mul-
tifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the PASSENGER AIR BAG OFF or ON
indicator lamp remains lit or goes out depends on how OCS clas- sifies the occupant.
If the conditions are not fulfilled, the system is not operating cor-
rectly.
Display messages217
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
X
Visit a qualified specialist workshop immediately.
For further information about the Occupant Classification System, see ( Ypage 47).
Front Passenger
AirbagEnabledSee
Operator's Manual
The front-passenger air bag is enabled during the journey, even
though:
R a child, a small adult or an object weighing less than the sys-
tem's weight threshold is located on the front-passenger seat or
R the front-passenger seat is unoccupied
The system may detect objects or forces applying additional
weight on the seat.
GWARNING
The air bag may deploy unintentionally.
There is an increased risk of injury.
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 ( Ypage 152).
X Switch the ignition off.
X Open the front-passenger door.
X Remove the child and the child restraint system from the front-
passenger seat.
X Make sure that there are no objects on the seat adding to the
weight.
The system may otherwise detect the additional weight and
interpret the seat occupant's weight as greater than it actuallyis.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
X Observe the PASSENGER AIR BAG indicator lamps in the center
console and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the PASSENGER AIR BAG OFF and PASSENGER AIR BAG ON
indicator lamps must light up simultaneously for approx-
imately six seconds
R the PASSENGER AIR BAG OFF indicator lamp must then light
up and remain lit. If the indicator lamp is on, OCS (Occupant
Classification System) has disabled the front-passenger front air bag ( Ypage 47)
R the
FrontPassengerAirbagEnabledSeeOperator's
ManualorFrontPassengerAirbagDisabledSeeOperZ
218Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
ator's Manualdisplay messages must not be shown in the
multifunction display.
X Wait for a period of at least 60 seconds until the necessary sys-
tem checks have been completed.
X Make sure that the display messages do not appear in the mul-
tifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the PASSENGER AIR BAG OFF or ON
indicator lamp remains lit or goes out depends on how OCS clas-
sifies the occupant.
If the conditions are not fulfilled, the system is not operating cor- rectly.
X Visit a qualified specialist workshop immediately.
For further information about the Occupant Classification System, see ( Ypage 47).
Lights
iVehicles with LED bulbs in the light clusters:
The display message for the corresponding light will only appear if all the LEDs have failed.
Display messagesPossible causes/consequences and MSolutions
b
Check Left Low
BeamorCheck
Right Low Beam
The left or right-hand low-beam headlamp is defective.
X Halogen headlamp: replace the bulb (Ypage 109).
X LED headlamps: consult a qualified specialist workshop.
b
Check Rear Left
Turn Signalor
Check Rear Right
Turn Signal
The rear left-hand or rear right-hand turn signal is defective.
X Tail lamps (vehicles with halogen headlamps): replace the
bulb ( Ypage 109).
X Tail lamps (vehicles with LED headlamps): visit a qualified
specialist workshop.
b
Check Front Left
Turn Signalor
Check Front Right
Turn Signal
The front left-hand or front right-hand turn signal is defective.
X Halogen headlamp: replace the bulb (Ypage 109).
X LED headlamps: consult a qualified specialist workshop.
Displaymessages219
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
b
Check Left Mirror
Turn Signalor
CheckRightMirror
Turn Signal
The turn signal in the left-hand or right-hand exterior mirror is
defective.
X Visit a qualified specialist workshop.
b
CheckCenterBrake
Lamp
The high-mounted brake lamp is faulty. XVisit a qualified specialist workshop.
b
Check Left Brake
LamporCheck
Right Brake Lamp
The left or right-hand brake lamp is defective. XVisit a qualified specialist workshop.
b
Check Left Tail
and Brake Lampsor
Check Right Tail
and Brake Lamps
The left or right-hand tail lamp/brake lamp is defective.
X Visit a qualified specialist workshop.
b
Check Left High
BeamorCheck
Right High Beam
The left or right-hand high beam is defective.
X Halogen headlamp: replace the bulb (Ypage 109).
X LED headlamps: consult a qualified specialist workshop.
b
License Plate Lamp
The left or right-hand license plate lamp is faulty.
X Check whether you are permitted to replace the bulb yourself (Y page 109).
or
X Visit a qualified specialist workshop.
b
Check Left Fog
LamporCheck Right
Fog Lamp
The left or right-hand fog lamp is faulty.
X Visit a qualified specialist workshop.
b
Rear Fog Lamp
The rear fog lamp is faulty.
X Tail lamps (vehicles with halogen headlamps): replace the
bulb ( Ypage 109).
X Tail lamps (vehicles with LED headlamps): visit a qualified
specialist workshop.
220Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
b
Check Front Left
Parking lampor
Check Front Right
Parking Lamp
The front left or front right parking or standing lamp is defective. X
Visit a qualified specialist workshop.
b
Backup Light
The backup lamp is defective.
X Tail lamps (vehicles with halogen headlamps): replace the
bulb ( Ypage 109).
X Tail lamps (vehicles with LED headlamps): visit a qualified
specialist workshop.
b
Check Left Tail
LamporCheck
Right Tail Lamp
The left or right-hand tail lamp is defective.
X Visit a qualified specialist workshop.
b
Check Front Left
Sidemarker Lampor
Check Front Right
Sidemarker Lamp
The front left-hand or front right-hand side marker lamp is faulty.
X Visit a qualified specialist workshop.
b
Check Rear Left
Sidemarker Lampor
Check Rear Right
Sidemarker Lamp
The rear left-hand or rear right-hand side marker lamp is faulty.
X Visit a qualified specialist workshop.
b
CheckLeftDaytime
Running Lightor
Check Right DayZ
time Running Light
The left or right-hand daytime running lamp is faulty.
X Visit a qualified specialist workshop.
b
Active Headlamps
Inoperative
The active light function is faulty.
X Visit a qualified specialist workshop.
b
Malfunction See
Operator's Manual
The exterior lighting is defective.
X Visit a qualified specialist workshop.
Display messages221
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
b
Active Headlamps
Inoperative
The light sensor is defective.
X Visit a qualified specialist workshop.
b
Switch Off Lights
The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X Turn the light switch to Ã.
Engine
Display messagesPossible causes/consequences and MSolutions
+
Check Coolant
Level See OperaZ
tor's Manual
The coolant level is too low.
!Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Add coolant, observing the warning notes before doing so (Y page 273).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop.
?The fan motor is faulty. XAt coolant temperatures below 248 ‡ (120 †), drive to the
nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-and-go traffic.
222Display messages
On-board computer and displays