2012 MERCEDES-BENZ C-Class SEDAN Park

Always pay attention to traffic conditions and
your surroundings. Otherwise, you may fail to
recognize dangers in time, cause an accident
and injure yourself and others.
Visual and audible collision warnings
If you switch on the appropriate turn signals
and a vehicle is detected in the side
monitoring range, you will receive a visual and
acoustic collision warning. You will hear a
double warning tone and red warning
lamp : flashes. If the turn signal remains on,
vehicles detected are indicated by the
flashing of red warning lamp :. There are no
further warning tones.
Course-correcting brake application
If Active Blind Spot Assist detects a risk of a
lateral collision in the monitoring range, a
course-correcting brake application is carried
out. This is meant to assist you in avoiding a
collision.
The course-correcting brake application is
available in the range between 20 mph
(30 km/h) and 120 mph (200 km/h).
If a course-correcting brake application
occurs, red warning lamp : flashes in the
exterior mirror and the following is shown in
the multifunction display, for example:GWARNING
Active Blind Spot Assist is only an aid
designed to assist driving. It is not a substitute
for attentive driving. In some cases, the
course-correcting brake application is not
sufficient to avoid a collision. In such a case,
you must steer, brake or accelerate.
In very rare cases, the system may
erroneously detect a danger of collision in the
area of crash barriers or similar lane borders
and apply the brakes. Active Blind Spot Assist
does not detect all traffic situations and road
users. Always make sure that there is
sufficient distance on the side for other traffic
or obstacles. An inappropriate brake
application may be interrupted at any time if
you steer slightly in the opposite direction or
accelerate.
You are responsible for driving at appropriate
speeds, 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 recognize dangers in time,
cause an accident and injure yourself and
others.
There will be either no or only a weak course-
correcting brake application if:
R there are vehicles or obstacles, e.g. crash
barriers, located on both sides of your
vehicle.
R a vehicle approaches you too closely at the
side.
R you have adopted a sporty driving style with
high cornering speeds.
R you clearly brake or accelerate.
R a driving safety system intervenes, e.g.
ESP ®
or PRE-SAFE ®
Brake.
R ESP ®
is switched off.
R a loss of tire pressure or a defective tire is
detected.
Switching on Active Blind Spot AssistXMake sure that the radar sensor system
( Y page 208) and Active Blind Spot Assist
( Y page 205) are activated in the on-board
computer.XTurn the SmartKey to position 2 in the
ignition lock.
Warning lamps : light up red in the
exterior mirrors for approximately 1.5
seconds and then turn yellow.Driving systems189Driving and parkingZ

Active Lane Keeping Assist
Important safety notes
Active Lane Keeping Assist monitors the area
in front of your vehicle by means of a camera
at the top of the windshield. Active Lane
Keeping Assist detects lane markings on the
road and warns you before you leave your
lane unintentionally. If you do not react to the
warning, a lane-correcting application of the
brakes can bring the vehicle back into the
original lane.
:Active Lane Keeping Assist camera
If you have selected the Display Unit
Speed-/Odometer (Y page 206) function in
the on-board computer and select km as the
unit of measurement, Active Lane Keeping
Assist is active from speeds of 60 km/h. If
the miles display unit is selected, the
assistance range begins at 40 mph.
GWARNING
Active Lane Keeping Assist does not keep
your vehicle 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
function if:
R several or no lane markings for a single lane
are present.
R there is poor visibility, e.g. due to
insufficient 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 windshield is dirty, fogged up or
covered, for instance by a sticker, in the
vicinity of the camera.
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.
Active 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
recognize dangers in time, cause an accident
and injure yourself and others.
Warning vibration in the steering wheel
A warning can be given when a front wheel
passes over a lane marking. You will be
warned by means of intermittent vibration in
the steering wheel for up to 1.5 seconds.
In order that you are warned only when
necessary and in good time if you cross the
lane marking, the system recognizes certain
conditions and warns you accordingly.
The warning vibration occurs earlier if:
R you approach the outer lane marking on a
bend.
R the road has very wide lanes, e.g. a
freeway.
R the system recognizes solid lane markings.
The warning vibration occurs later if:
R the road has narrow lanes.
R you cut the corner on a bend.190Driving systemsDriving and parking

No warning vibration occurs if:
R you clearly and actively steer, brake or
accelerate.
R you cut the corner on a sharp bend.
R a driving safety system intervenes, e.g.
ABS, BAS or ESP ®
.
R you switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time.
Lane-correcting brake application
If you leave your lane under certain
circumstances the vehicle will brake briefly
on one side. This is meant to assist you in
bringing the vehicle back to the original lane.
This function is available in the range between
40 mph and 120 mph (60 km/h to
200 km/h).
A lane-correcting brake application can only
be made after driving over a solid,
recognizable lane marking. Before this, a
warning must be given by means of
intermittent vibration in the steering wheel.
In addition, a lane with lane markings on both
sides must be recognized. The brake
application also slightly reduces vehicle
speed.
If a lane-correcting brake application occurs,
the following, for example, appears in the
multifunction display:
i A further lane-correcting brake
application can only occur after your
vehicle has returned to the original lane.
GWARNING
Active Lane Keeping Assist does not keep
your vehicle in its lane. It is only an aid
designed to assist driving. It is not a substitute
for attentive driving. In some cases, the lane-
correcting brake application is not sufficient
to bring your vehicle back to the original lane.
In such cases, you must steer the vehicle
yourself to ensure that it does not leave the
lane.
Active Lane Keeping Assist does not detect
road and traffic conditions. Always make sure
that there is sufficient distance to the side for
other traffic or obstacles. In rare cases,
unclear markings or particular structures on
the roadway can be recognized as solid lane
markings. An inappropriate brake application,
e.g. after intentionally driving over a solid lane
marking, may be interrupted at any time by
steering slightly in the opposite direction.
Active Lane Keeping Assist cannot take
weather conditions into account.
You are responsible for the driving at
appropriate speeds, 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 recognize dangers in time,
cause an accident and injure yourself and
others.
No lane-correcting brake application occurs
if:
R you clearly and actively steer, brake or
accelerate.
R you cut the corner on a sharp bend.
R you switch on the turn signals.
R a driving safety system intervenes, e.g.
ESP ®
, PRE-SAFE ®
Brake or Active Blind
Spot Assist.
R you have adopted a sporty driving style with
high cornering speeds or high rates of
acceleration.
R ESP ®
is switched off.
R the transmission is not in position D.
R a loss of tire pressure or a defective tire has
been detected and displayed.Driving systems191Driving and parkingZ

Active Lane Keeping Assist does not detect
traffic situations or road users. An
inappropriate brake application may be
interrupted at any time if you:
R steer slightly in the opposite direction.
R use a turn signal.
R clearly brake or accelerate.
A lane-correcting brake application is
interrupted automatically if:
R a driving safety system intervenes, e.g.
ESP ®
, PRE-SAFE ®
Brake or Active Blind
Spot Assist.
R lane markings can no longer be recognized.
Switching on Active Lane Keeping AssistXSwitch on Active Lane Keeping Assist using
the on-board computer ( Y page 205).
Symbol : appears in the multifunction
display.
If your speed exceeds 40 mph (60 km/h)
and lane markings are detected,
symbol : is shown in green. Active Lane
Keeping Assist is ready for use.192Driving systemsDriving and parking

XTo show menu bar ;: press the =
or ; button on the steering wheel.
The following messages may appear in the
multifunction display:
X j YParking Guidance ( Y page 178)_Adaptive Highbeam Assist
( Y page 110)ÀATTENTION ASSIST ( Y page 182)ÃLane Keeping Assist ( Y page 185) or
Active Lane Keeping Assist
( Y page 190)HOLDHOLD function ( Y page 172)ÄPRE-SAFE ®
Brake ( Y page 65)Displays and operation197On-board computer and displaysZ

XTo activate: press a again.
The å warning lamp in the instrument
cluster goes out.
Activating/deactivating PRE-SAFE ®
Brake
PRE-SAFE ®
Brake is only available in vehicles
with DISTRONIC PLUS.
XPress the = or ; button on the
steering wheel to select the DriveAssist
menu.XPress 9 or : to select PRE-SAFE
Brake .XPress a.
The current selection is displayed.XTo activate/deactivate: press a
again.
When PRE-SAFE ®
Brake ( Y page 65) is
activated, the multifunction display shows
the Ä symbol as long as the HOLD
function is not activated ( Y page 172).
Vehicles with Parking Guidance: if
PARKTRONIC is activated and you are driving
at a speed under 22 mph (35 km/h) the j
symbol for Parking Guidance is displayed
instead of the Ä symbol.
Activating/deactivating ATTENTION
ASSIST
XPress the = or ; button on the
steering wheel to select the DriveAssist
menu.XPress the 9 or : button to select
Attention Asst. .XPress a.
The current selection is displayed.XTo activate/deactivate: press a
again.
When ATTENTION ASSIST ( Y page 182) is
activated, the À symbol appears in the
multifunction display when the ignition is on.
Activating/deactivating Blind Spot
Assist
You can use the Blind Spot Asst. function
to activate or deactivate Blind Spot Assist
( Y page 183) or Active Blind Spot Assist
( Y page 187).
XPress = or ; on the steering wheel
to select the DriveAssist menu.XPress 9 or : to select Blind Spot
Asst. .XPress a.
If the function is activated, the monitored
areas are shown in red in the multifunction
display.XTo activate/deactivate: press a
again.
Activating/deactivating Lane Keeping
Assist
You can use the Lane Keep. Asst. function
to activate/deactivate Lane Keeping Assist
( Y page 185) or Active Lane Keeping Assist
( Y page 190).
XPress the = or ; button on the
steering wheel to select the DriveAssist
menu.XPress the 9 or : button to select
Lane Keep. Asst. .XPress a.
If the function is activated, the road
markings are shown in red in the
multifunction display.XTo activate/deactivate: press a
again.
If Lane Keeping Assist or Active Lane keeping
Assist is activated, the multifunction display
shows the à symbol when the ignition is
switched on.
Menus and submenus205On-board computer and displaysZ

Lights
Switching the daytime running lamps on/
off
This function is not available in Canada.
If you have activated the Day Lights
function and the light switch is in the c or
à position, the daytime running lamps are
switched on automatically during the day
when the engine is running.
In the dark, the following also light up:
R the low-beam headlamps
R the parking lamps
R the tail lamps
R the license plate lamp
R the side marker lamps
XPress the = or ; button on the
steering wheel to select the Sett. menu.XPress the : or 9 button to select the
Lights submenu.XPress the a button to confirm.XPress the : or 9 button to select the
Day Lights function.
If the Daytime Running Lights: function
has been switched on, the cone of light and
the W symbol in the multifunction
display are shown in red.XPress the a button to save the setting.
Switching Adaptive Highbeam Assist on/
off
XPress the = or ; button on the
steering wheel to select the Sett. menu.XPress the : or 9 button to select the
Lights submenu.XPress the a button to confirm.XPress : or 9 to select the Adapt.
Highbeam function.
If the Adapt. Highbeam function has been
switched on, the cone of light and the
_ symbol in the multifunction display
are shown in red.XPress the a button to save the setting.Activating/deactivating surround
lighting and exterior lighting delayed
switch-off
If you have activated the Surround
Lighting function and the light switch is in
the c or à position, the following
functions are active when it is dark:
R Surround lighting: the exterior lighting
remains lit for 40 seconds after unlocking
with the SmartKey. The exterior lighting
switches off when you open the driver's
door.
R Exterior lighting delayed switch-off: the
exterior lighting remains lit for 60 seconds
after the engine has been switched off. If
you close all the doors, the exterior lighting
goes off after 15 seconds.
If you activate the Surround Lighting
function, the following light up depending on
the vehicle's equipment:
R the parking lamps
R the fog lamps
R the daytime running lamps
R the side marker lamps
R the surround lighting in the exterior mirrorsXPress the = or ; button on the
steering wheel to select the Sett. menu.XPress the : or 9 button to select the
Lights submenu.XPress the a button to confirm.XPress the : or 9 button to select the
Surround lighting function.
When the Surround Lighting function is
activated, the light cone and the area
around the vehicle are displayed in red in
the multifunction display.XPress the a button to save the setting.Menus and submenus207On-board computer and displaysZ

Display messages
General notes
GWARNING
All categories of messages contain important information which should be taken note of and,
where a malfunction is indicated, addressed as soon as possible at an authorized Mercedes-Benz
Center.
Failure to repair the condition noted may cause damage not covered by the Mercedes-Benz
Limited Warranty, or result in property damage or personal injury.
Display messages appear in the multifunction display.
Display messages with graphic displays may be shown in simplified form in the Operator's
Manual and may differ from the messages shown in the multifunction display.
Please respond in accordance with the display messages and follow the additional notes in
this Operator's Manual.
Certain display messages are accompanied by an audible warning tone or a continuous tone.
When you stop and park the vehicle, please observe the notes on the HOLD function
( Y page 172) and parking ( Y page 153).
Hiding display messages
You can hide some display messages with a low priority.
XPress the a or % button on the steering wheel to hide the display message.
The display message is cleared.
Display messages with a high priority are shown in red.
You cannot hide display messages of the highest priority. The multifunction display shows
these messages continuously until the causes for the messages have been remedied.
Message memory
The message memory allows you to call up previous display messages.
XPress = or ; on the steering wheel to select the Serv. menu.
If there are display messages, the multifunction display shows 2 Messages, for example.XPress the 9 or : button to select the entry, e.g. 2 Messages.XConfirm with a.XPress the 9 or : button to scroll through the display messages.
When the ignition is switched off, all display messages are deleted apart from some high-
priority display messages. Once the causes of the high-priority display messages have been
rectified, the corresponding display messages are also deleted.
Display messages213On-board computer and displaysZ