2011 MERCEDES-BENZ B-CLASS HATCHBACK warning light

If you have attached a traile
rto your vehicle,
you should not use Active Parking Assist.
Once the electrical connection is established
between your vehicle and the trailer, Active
Parking Assist is no longer available. Reversing camera
General notes Reversing camera in the tailgate handle
Reversing camera :is an optical parking
and manoeuvring aid. It uses guide lines to
show the area behind your vehicle in the
Audio/COMAND display.
The area behind the vehicle is displayed as a
mirror image, as in the rear-view mirror.
Important safety notes G
WARNING
Make sure that no persons or animals are in
the manoeuvring range. Otherwise, they
could be injured. G
WARNING
The reversing camera is only an aid and may
display obstacles in a distorted or incorrect
manner, or may not even display them at all.
The reversing camera does not relieve you of
the responsibility to pay attention. The cam-
era cannot show objects: R
very near to the rear bumper
R below the rear bumper
R that are located above the tailgate handle
recess
You are always responsible for safety and
must continue to pay attention to your imme-
diate surroundings when parking and
manoeuvring. This applies to the areas
behind, in front of and next to the vehicle. You
could otherwise endanger yourself and oth-
ers. G
WARNING
Under the following circumstances, the
reversing camera will not function, or will
function in a limited manner:
R if the tailgate is open
R in heavy rain, snow or fog
R at night or in very dark places
R if the camera is exposed to very bright light
R if the area is lit by fluorescent light or LED
lighting (the display may flicker)
R if there is a sudden change in temperature,
e.g. when driving into a heated garage in
winter
R if the camera lens is dirty or obstructed
R if the rear of your vehicle is damaged. In this
event, have the camera position and setting
checked at a qualified specialist workshop.
Mercedes-Benz recommends that you use
a Mercedes-Benz Service Centre for this
purpose.
Do not use the reversing camera in these
types of situation. You could otherwise injure
others or damage objects and your vehicle
while you are parking.
Activating/deactivating the reversing
camera X
To activate: make sure that the key is in
position 2in the ignition lock.
X Make sure that in the audio system/
COMAND Online, the "Reversing camera"
function is selected; see the separate oper- 170
Driving systemsDriving and parking

ating instructions for the audio system/
COMAND Online.
X Engage reverse gear.
Guide lines are used to show the area
behind the vehicle in the Audio/COMAND
display. Function mode display for vehicles with COMAND
Online and a trailer tow hitch
X
To switch between function modes on
vehicles with COMAND Online and a
trailer tow hitch: selectthe "Reverse
parking" function with the COMAND con-
troller symbol :; see the separate operat-
ing instructions for COMAND Online.
or
X For the "Coupling up a trailer" function,
select the symbol ;; see the separate
operating instructions for COMAND Online.
The symbol of the selected function is high-
lighted.
To deactivate: the reversing camera is deac-
tivated if you:
R select transmission position P(vehicles
with automatic transmission)
R drive forward ten metres
R for vehicles with an automatic transmis-
sion, shift the transmission from Rto
another position after 15 seconds
R for vehicles with manual transmission, shift
out of reverse gear after 15 seconds
R drive forwards at a speed of over
10 km/h Displays in the Audio/COMAND display G
WARNING
Using the reversing camera can be dangerous
if you are colour-blind or if your ability to dis-
tinguish colours is impaired.
Only use the reversing camera if you can see
and distinguish between all the coloured
guide lines that are displayed by the reversing
camera in the Audio/COMAND display. G
WARNING
Please note that objects not at ground level
may appear to be further away than they
actually are. These include:
R the bumper of a vehicle that is parked
behind your vehicle
R a trailer drawbar
R the ball coupling of a trailer tow hitch
R the tail-end of a lorry
R slanted posts
The lines are only guides, not accurate meas-
urements of the distance to an obstacle.
Therefore, you should never pass the red line
when approaching an obstacle. You could oth-
erwise cause an accident and injure yourself
and others. Lanes
:
White lane marking vehicle width with
steering wheel straight (static)
; Yellow lane marking the course the tyres
will take at the current steering wheel
angle (dynamic) Driving systems
171Driving and parking Z

=
Red lane marking vehicle width at the cur-
ren tsteering wheel angle (dynamic)
? Bumper
For the white and red lanes, the vehicle width
includes the exterior mirrors. For the yellow
lane, the vehicle width is measured to the
outer edge of the wheels. Guide lines
? Bumper
A Red guide line at a distance of approx-
imately 0.25 mfrom the rear of the vehicle
B Yellow guide line at a distance of approx-
imately 4.0 mfrom the rear of the vehicle
C Vehicle centre axle (marker assistance)
D Yellow guide line at a distance of approx-
imately 1.0 mfrom the rear of the vehicle
The lanes and guide lines are only displayed
if you have engaged reverse gear.
The distance specifications only apply to
objects that are at ground level. Additional displays on vehicles with PARKTRONIC
and COMAND Online
:
Front warning display
; Additional PARKTRONIC operational read-
iness indicator
= Rearw arning display
Vehicles with PARKTRONIC and COMAND
Online: if PARKTRONIC is operational
(Y page 163), an additional operational read-
iness indicator will appear in the COMAND
display ;. If the PARKTRONIC warning dis-
plays are active or light up, the warning dis-
plays :and =are also active or light up
correspondingly in the COMAND display.
"Reverse parking" function X
Make sure that the reversing camera is
activated and the "Reverse parking" func-
tio nis selected; see the separate operating
instructions for the audio system/
COMAND Online.
The lane and the guide lines are shown. 172
Driving systemsDriving and parking

Indicator and warning display
G
WARNING
Blind Spo tAssist is not active at speeds below
30 km/h. The indicator lamps in the exterior
mirrors are yellow. Vehicles in the monitoring
range are then not indicated.
Always pay attention to traffic conditions and
your surroundings. Otherwise, you may fail to
recognise dangers in time, cause an accident
and injure yourselfa nd others. :
Yellow indicator lamp/red warning lamp
If Blind Spo tAssist is switched on, indicator
lamp :in the exterior mirrors lights up yel-
low up to a speed of 30 km/h. At speeds
above 30 km/h, the indicator lamp goes out
and Blind Spot Assist is operational.
If a vehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
30 km/h, warning lamp :on the corre-
sponding side lights up in red. This warning is
always emitted when a vehicle enters the
blind spot monitoring range from behind or
from the side. When you overtake a vehicle,
the warning only occurs if the difference in
speed is less than 12 km/h.
The yellow indicator lamp goes out if reverse
gear is engaged. Blind Spot Assist is then
deactivated.
The brightness of the indicator/warning
lamps is adjusted automatically according to
the ambient light. Collision warning
If a vehicle is detected in the monitoring range
of Blind Spot Assist and you switch on the
corresponding turn signal, a double warning
tone sounds. Red warning lamp
:flashes. If
the turn signal remains on, detected vehicles
are indicated by the flashing of red warning
lamp :.There are no further warning tones.
Switching on Blind Spot Assist
X On vehicles without an integrated naviga-
tion system, make sure that the Becker ®
MAP PILOT is connected; see the separate
operating instructions for Audio 20.
X Make sure that the radar sensor system
(Y page 203) and Blind Spot Assist
(Y page 199) are activated in the on-board
computer.
X Turn the key to position 2in the ignition
lock.
Warning lamps :light up red in the exte-
rior mirrors for approximately 1.5 seconds
and then turn yellow.
Trailer towing
If you attach a trailer, make sure that you have
correctly established the electrical connec-
tion. This can be accomplished by checking
the trailer lighting. Blind Spot Assist is then
deactivated. The indicator lamp lights up yel-
low in the exterior mirrors and the Blind Spot Assist currently unavailable
See Owner's Manual message appears in
the multifunction display.
i You can deactivate the indicator lamps in
the exterior mirrors.
To do so, switch off Blind Spot Assist if:
R the key is in position 2in the ignition
lock.
R the engine is not running.
R the electrical connection to the trailer
has been established. Driving systems
179Driving and parking Z

Lane Keeping Assist
General notes
Lane Keeping Assist monitors the area in
fron tofy our vehicle by means of a camera at
the top of the windscreen .Lane Keeping
Assist detects lane markings on the road and
warns you before you leave your lane unin-
tentionally. :
Lane Keeping Assist camera
If you select km on the on-board computer in
the Display unit Speed-/odometer: function (Y
page 200), Lane Keeping Assist
is active starting at aspeed of 60 km/h. If the
miles display unit is selected, the assistance
range begins at 40 mph.
Important safety notes G
WARNING
Lane Keeping Assist does not keep your vehi-
cle in its lane. It is only an aid and may detect
the lane markings on the road incorrectly or
not at all.
The system may be impaired or may not func-
tion if:
R there is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to
snow, rain, fog or spray.
R there is glare, e.g. from oncoming traffic,
the sun, or reflection from other vehicles.
R the windscreen is dirty, misted up or cov-
ered, for instance by a sticker, in the vicinity
of the camera
R several or no lane markings for a single lane
are present. R
the lane markings are worn away, dark or
covered up, e.g. by dirt or snow.
R the distance to the vehicle in front is too
small and the lane markings thus cannot be
detected.
R the lane markings on the road are unclear,
e.g. near roadworks.
R the lane markings change quickly, e.g.
lanes branch off, cross one another or
merge.
R the road is narrow and winding.
Lane Keeping Assist cannot detect road and
traffic conditions. It is not a substitute for
attentive driving. You are responsible for the
vehicle's speed, braking in good time, and
steering correctly. Always adapt your driving
style to suit the prevailing road and weather
conditions. Always pay attention to traffic
conditions and your surroundings. Otherwise,
you may fail to recognise dangers in time,
cause an acciden tand injure yoursel fand oth-
ers.
A warning may be given if a front wheel
passes ove ralane marking. It will warn you
by means of intermittent vibration in the
steering wheel for up to 1. 5seconds.
Activating Lane Keeping Assist Example: vehicles with automatic transmission
X
Switch on Active Lane Keeping Assist using
the on-board computer; to do so, select
Standard or
Adaptive (Y
page 199).
Symbol :appears in the multifunction
display.
If you drive at speeds above 60 km/h and
lane markings are detected, symbol :is
highlighted. Lane Keeping Assist is ready
for use. 180
Driving systemsDriving and parking

When towing a trailer, always adjust your
speed to the curren
troad and weather con-
ditions. Do not exceed the maximum permis-
sible speed for your vehicle/trailer combina-
tion. G
WARNING
Never depress the brake pedal continuously
while the vehicle is in motion, e.g. never cause
the brakes to rub by applying constant slight
pedal pressure. This causes the brake system
to overheat, increases the braking distance
and can lead to the brakes failing completely. G
WARNING
On no account should you attempt to draw the
vehicle/trailer combination out by increasing
speed. G
WARNING
If you exceed the maximum noseweight when
using a carrier system on the ball coupling:
R the carrier system may be thrown around.
R the ball coupling and the carrier system
may become detached from the vehicle.
As a result, you may injure others or cause an
accident.
Do not exceed the maximum noseweight.
When driving with a loaded carrier system,
always adjust your driving style to the prevail-
ing road, traffic and weather conditions and
drive particularly carefully.
You can use carrier systems, e.g. bicycle
racks or load-bearing implements, on the ball
coupling. The maximum noseweight of 75kg
applies when using carrier systems on the ball
coupling.
General notes !
Use a drawbar noseweight as close as
possible to the maximum permissible nose-
weight. Do not use a noseweight of less
than 50kg, otherwise the trailer may come
loose. Note that the payload and the rear axle load
are reduced by the actual payload.
X When towing a trailer, set the tyre pressure
on the rear axle of the towing vehicle for a
maximum load; see the tyre pressure table
in the fuel filler flap (Y page 295).
You will find installation dimensions and loads
in the "Technical data" section
(Y page 318).
The maximum noseweight of the trailer draw-
bar on the ball coupling is 75 kg. The actual
noseweight may however not be higher than
the value which is given on the trailer tow
hitch or trailer identification plates. The low-
est weight applies.
Please note that when towing a trailer, PARK-
TRONIC (Y page 163) and Blind Spot Assist
(Y page 177) are only available with limita-
tions, or not at all.
i The height of the ball coupling changes
with the load of the vehicle. If necessary,
use a trailer with a height-adjustable draw-
bar.
Driving tips i
Observe the notes on ESP ®
trailer stabi-
lisation (Y page 67).
The maximum permissible speed for vehicle/
trailer combinations depends on the type of
trailer. Before beginning the journey, check
the trailer's documents to see what the max-
imum permitted speed is. Observe the legally
prescribed maximum speed in the relevant
country.
For certain Mercedes-Benz vehicles, the max-
imum permissible rear axle load is increased
when towing a trailer. Refer to the "Technical
data" section to find out whether this applies
to your vehicle. If you utilise any of the added
maximum rear axle load when towing a trailer,
the vehicle/trailer combination may not
exceed a maximum speed of 100 km/h for
reasons concerning the operating permit.
This also applies in countries in which the 182
Towing
atrailerDriving an d parking

X
Pull out release wheel =.
X Turn release wheel =anti-clockwise as far
as it will go.
The ball coupling disengages and folds out
behind the rear bumper. Indicator
lamp ?flashes. X
Pull the ball coupling in the direction of the
arrow until it engages in a vertical position.
Indicator lamp ?goes out. The power
socket folds down automatically.
The multifunction display shows the
Check trailer hitch lock display mes-
sage until the ball coupling is engaged.
X Remove the protective covering from the
ball coupling and store it in a safe place.
X Make sure that the ball of the ball coupling
is clean and that it is either greased or dry
(grease free), depending on the instruc-
tions for the trailer. Coupling up a trailer
G
WARNING
Do not disconnect a trailer with an engaged
overrun brake. Otherwise, your hand could
become trapped between the bumper and
trailer drawbar.
X Make sure that the transmission is in posi-
tion P.
X Engage the electric parking brake.
X Position the trailer level behind the vehicle.
X Couple up the trailer.
X Establish the electrical connection
between the vehicle and the trailer.
X Check that the trailer lighting system is
working. Decoupling
atrailer G
WARNING
As soon as you raise the trailer drawbar, the
unladen vehicle rises slightly. The vehicle then
lowers to driving level.
Make sure tha tnobody is in the vicinity of the
wheel arch or the underbody. You could oth-
erwise trap yourself or others. G
WARNING
The vehicle is lowered as soon as you discon-
nect the trailer cable. Make sure that nobody
is in the vicinity of the wheel arch or the
underbody. You could otherwise trap yourself
or others.
As soon as you decouple the trailer, the unla-
den vehicle rises slightly. Make sure that you
or others are not injured in the process.
! Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound-
ing of the overrun brake.
X Make sure that the transmission is in posi-
tion P.
X Engage the electric parking brake. 184
Towing
atrailerDriving an d parking

Menus and submenus
Menu overview
Function
:
Trip menu (Y
page 193) ;
Navi menu (navigatio
ninstructions) (Y page 194) =
Audio menu (Y
page 195) ?
Tel menu (telephone) (Y
page 196)A
Assist. menu (assistance) (Y
page 198)B
Service menu (Y
page 200)
R calls up display messages (Y page 205)
R tyre pressure loss warning (Y page 297)
R ASSYST PLUS service interval display (Y page 266)C
Settings menu (Y
page 200) The numbe
rofmenus shown depends on the optional equipment in the vehicle.
The Audio ,
Navi and
Tel menus differ slightly in vehicles with Audio 20 and in vehicles with
COMAND Online. The examples given in this Owner's Manual apply to vehicles equipped with
COMAND Online. 192
Menus and submenusOn-board computer and displays