2013 MERCEDES-BENZ B-CLASS SPORTS sensor

X
To deactivate: pressaagain.
The å warning lamp in the instrument
cluster lights up.
X To activate: pressaagain.
The å warning lamp in the instrument
cluster goes out.
Switching the distance warning
function on and off X
Press the =or; button on the
steering wheel to select the DriveAssistmenu.
X Press 9or: to select Dist. Warning .
X Press the abutton.
The current selection is displayed.
X To activate/deactivate: press thea
button again.
Whe nthe distance warning function is
activated, the multifunction display shows
the Ä symbol if the HOLD function is not
activated (Y page 160).
Vehicles with Active Parking Assist: if
PARKTRONIC is activated and you are driving
at a speed under 22 mph (35 km/h), the j
Active Parking Assist symbol is shown instead
of the Äsymbol (Y page 164).
Further information on the distance warning
function (Y page 60).
Activating/deactivating ATTENTION
ASSIST X
Press the =or; button on the
steering wheel to select the DriveAssistmenu.
X Press the 9or: button to select
Attention Asst. .
X Press the abutton.
The current selection is displayed.
X To activate/deactivate: press thea
button again. When ATTENTION ASSIST (Y
page 171) is
activated, the Àsymbol appears in the
multifunction display when the ignition is on.
Activating/deactivating Blind Spot
Assist X
Press the =or; button on the
steering wheel to select the DriveAssist menu.
X Press the 9or: button to select
Blind Spot Asst. .
X Press the abutton.
The current selection is displayed.
X To activate/deactivate: press thea
button again.
For further information about Blind Spot
Assist, see (Y page 173).
When the Blind Spot Assist: Sensors Deactivated message is shown, the radar
sensors are deactivated.
X Switch on the radar sensor system
(Y page 192).
Activating/deactivating Lane Keeping
Assist X
Press the =or; button on the
steering wheel to select the DriveAssist menu.
X Press the 9or: button to select
Lane Keep. Asst. .
X Press the abutton.
The current selection is displayed.
X Press ato confirm.
X Press the :or9 button to set Off ,
Standard or
Adaptive .
X Press the abutton to save the setting.
If Lane Keeping Assist (Y page 174) is
activated and the ignition is switched on, the
à symbol appears in the multifunction
display. 188
Menus and submenusOn-board computer and displays

Activating/deactivating the rada
rsensor
system
X Press the =or; button on the
steering wheel to selec tthe Settings menu.
X Press the :or9 button to select the
Vehicle submenu.
X Press ato confirm.
X Press the 9or: button to select
Radar Sensor (See Oper. Manual): .
You will see the selected setting: Enabledor
Disabled .
X Press the abutton to save the setting.
If the radar sensor system is switched off,
Blind Spot Assist is deactivated
(Y page 173).
Convenience Switching the fold-in mirrors when
locking feature on/off
This function is only available on vehicles with
the memory function (Y
page 93).
X Press the =or; button on the
steering wheel to select the Sett. menu.
X Press the :or9 button to select the
Convenience submenu.
X Press ato confirm.
X Press the :or9 button to select the
Fold Mirrors in when Locking: function.
You will see the selected setting:
Enabledor
Disabled .
X Press the abutton to save the setting.
If you switch on the Fold Mirrors in when
Locking: function, the exterior mirrors fold
in when you lock the vehicle. If you unlock the
vehicle and then open the driver's or front-
passenger door, the exterior mirrors fold out
again.
If you have switched the function on and you
fold the exterior mirrors in using the button
on the door (Y page 91), they will not fold out
automatically.T he exterior mirrors can then only be folded out using the button on the
door.
Restoring the factory settings X
Press the =or; button on the
steering wheel to select the Sett. menu.
X Press the :or9 button to select the
Factory Setting submenu.
X Press ato confirm.
The Reset All Settings? message
appears.
X Press the :or9 button to select
No or
Yes .
X Press ato confirm the selection.
If you have selected Yes , the multifunction
display shows a confirmation message.
For safety reasons, the Daytime Running Lights: function in the
Lights submenu is
only reset when the vehicle is stationary. 192
Menus and submenusOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
PRE-SAFE
Functions
Currently Limited
See Operator's
Manual Adaptive Brake Assis
tis temporarily inoperative. Possible causes
are:
R the radar sensor system cover in the radiator grill is dirty.
R function is impaired due to heavy rain or snow.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
When the causes stated above no longer apply, the display
message disappears.
Adaptive Brake 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 141).
X Cleant he radar sensor cover in the radiator grill (Y page 269).
X Restart the engine. PRE-SAFE
Functions Limited
See Operator's
Manual Adaptive Brake Assist is faulty. The distance warning signal may
also have failed.
X
Visit a qualified specialist workshop. 6
SRS Malfunction
Service Required There is a malfunction in the SRS (Supplemental Restraint
System). The
6warning lamp also lights up in the instrument
cluster.
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 Visit a qualified specialist workshop.
Further information on occupant safety (Y page 36). Display messages
201On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
b
Backup Light The backup lamp is defective.
X
Chec kwhether you are permitted to replace the bulb yourself
(Y page 102).
or
X Visit a qualified specialist workshop. b
Check Left Tail
Lamp or
Check Right Tail Lamp The left or right-hand tail lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 102).
or
X Visit a qualified specialist workshop. b
Check Front Left
Sidemarker Lamp or
Check Front Right Sidemarker Lamp The left or right front side marker lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 102).
or
X Visit a qualified specialist workshop. b
Check Rear Left
Sidemarker Lamp or
Check Rear Right Sidemarker Lamp The rear left or right side marker lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 102).
or
X Visit a qualified specialist workshop. b
Check
Left Daytime
Running Light or
Check Right Daytime Running
Light The left-hand or right-hand daytime running lamp is faulty.
X
Check whether you are permitted to replace the bulb yourself
(Y page 102).
or
X Visit a qualified specialist workshop. b
Active Headlamps
Inoperative The active light function is defective.
X
Visit a qualified specialist workshop. b
Malfunction See
Operator's Manual The exterior lighting is defective.
X
Visit a qualified specialist workshop. b
Auto
Lamp Function
Inoperative The light sensor is defective.
X
Visit a qualified specialist workshop. Display messages
205On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
ç There is only a very small amount of fuel in th
efuel tank.
X Refuel at the neares tgas statio nwithout fail. æ
Gas Cap Loose 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.
If the fuel filler cap is not correctly closed:
X Close the fuel filler cap.
If the fuel filler cap is correctly closed:
X Visit a qualified specialist workshop. Driving systems
Displa
ymessages Possible causes/consequences and
M Solutions
À
Attention Assist:
Take a Break! Based on certain criteria, ATTENTION ASSIST has detected fatigue
or
alack of concentration on thep art of thedriver. A warning tone
also sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good time so you get
enough rest. À
Attention Assist
Inoperative ATTENTION ASSIST is inoperative.
X
Visi taqualified specialist workshop. ë
Off The HOLD function is deactivated. The vehicle is skidding.
Aw
arning tone also sounds.
X Reactivate the HOLD function later (Y page 160). The HOLD function is deactivated. When the brak
epedal is firmly
depressed, an activation condition is not fulfilled.
Aw arning tone also sounds.
X Check the activation conditions for the HOLD function
(Y page 160). Radar Sensors
Deactivated See
Operator's Manual The radar sensor system is deactivated.
X
Switch on the radar sensor system (Y page 192). Display messages
209On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
Lane Keeping
Assist Currently
Unavailable See
Operator's Manual Lane Keeping Assis
tis deactivated and temporarily inoperative.
Possible causes are:
R the windshield in the camera's field of vision is dirty.
R visibility is impaired due to heavy rain, snow or fog.
R there are no lane markings for a longer period.
R the lane markings are worn, dark or covered, e.g. by dirt or snow.
When the causes stated above no longer apply, the display
message disappears.
Lane Keeping 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 141).
X Cleant he windshield. Lane Keeping
Assist Inoperative Lane Keeping Assist is faulty.
X
Visit a qualified specialist workshop. Blind Spot Assist
Currently
Unavailable See
Operator's Manual Blind Spot Assist is temporarily inoperative. Possible causes are:
R
the sensors are dirty.
R 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
stations or other sources of electromagnetic radiation.
The yellow 9indicator lamps also light up in the exterior
mirrors.
When the causes stated above no longer apply, the display
message disappears.
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 141).
X Cleant he sensors (Y page 269).
X Restart the engine. 210
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
DISTRONIC PLUS
Currently
Unavailable See
Operator's Manual DISTRONIC PLU
Sis temporarily inoperative. Possible causes are:
R function is impaired due to heavy rain or snow.
R the sensors in the bumpers are dirty.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
Aw arning tone also sounds.
When the causes stated above no longer apply, the display
message disappears.
DISTRONIC is operational again.
If the display message does notd isappear:
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 141).
X Clean the sensors in the radiator trim (Y page 269).
X Restar tthe engine. DISTRONIC PLUS
Inoperative DISTRONIC PLUS is defective. Adaptive Brake Assist may also
have failed.
Aw
arning tone also sounds.
X Visi taqualified specialist workshop. DISTRONIC PLUS
Passive You have depressed the accelerator pedal. DISTRONIC PLUS is no
longer controlling the speed of the vehicle.
X
Remove your foot from the accelerator pedal. DISTRONIC PLUS
--- mph An activation condition for DISTRONIC PLUS is not fulfilled.
X
Check the activation conditions for DISTRONIC PLUS
(Y page 154). 212
Display messagesOn-board computer and displays

Engine
Problem Possible causes/consequences and
M Solutions
;
The yellow Check
Engine warning lamp
lights up while the
engine is running.
There may be a malfunction, for example:
R
in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignition system
R in the fuel system
The emission limit values may be exceeded and the engin emay
be running in emergency mode.
X Have the vehicle checked as soon as possible at a qualified
specialist workshop.
i In some states, you must immediately visit a qualified
specialist workshop as soon as the yellow Chec kEngine warning
lamp lights up.T his 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. æ
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. æ
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: visit a qualified specialist
workshop. ?
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 141).
X Consult a qualified specialist workshop. 226
Warning and indicator lamps in the instrument clusterOn-board computer and displays