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Active Driving Assistance package
Generalnotes
The Active DrivingAssistance package
consistsofDISTRONICPLUS(Ypage 177),
Active Blind Spot Assist(Ypage 211) and
Active LaneKeepingAssist(Ypage 214).
Active Blind Spot Assist
Generalnotes
Active Blind Spot Assistusesaradar sensor
system, pointed toward the rear of the
vehicle, to monitor the area to the sides of the
vehicle which the driver is unable to see. A
warning displayinthe exterior mirrors draws
your attention to vehicles detected in the
monitored area. If you then switch on the
corresponding turn signal to change lane, you
will also receive an optical and audible
warning. Ifarisk of lateral collision is
detected, corrective braking may help you
avoidacollision. Beforeacourse-correcting
brake application, Active Blind Spot Assist
evaluates the space in the direction of travel
and at the sides of the vehicle. For this, Active
Blind Spot Assist uses radar sensors which
are pointed in the direction of travel.
Active Blind Spot Assist supports you from a
speed of approximately 20 mph (30 km/h).
For Active Blind Spot Assist to assist you
when driving, the radar sensor system must
be:
Ractivated(Ypage 232)
Roperational
Important safety notes
Active Blind Spot Assist is only an aid and is
notasubstitute for attentive driving.
GWARNING
Active Blind Spot Assist does not react to:
Rvehicles overtaken too closely on the side,
placing them in the blind spot area
Rvehicles which approach withalarge speed
differential and overtakeyour vehicle
Asaresult, Active Blind Spot Assist may
neither give warnings nor intervene in such
situations. There isarisk of an accident.
Always observe the traffic conditions
carefully, and maintainasafe lateral distance.
iUSA only:
This device has been approved by the FCC
asa"Vehicular RadarSystem". The radar
sensor is intended foruse in an automotive
radar system only. Removing, tampering
with, or altering the device will void any
warranties, and is not permitted by the
FCC. Do not tamper with, alter, or use in
any non-approved way.
Any unauthorized modification to this
device could void the user’s authority to
operate the equipment.
iCanada only: This device complies with
RSS-210ofIndustry Canada.Operation is
subject to the following two conditions:
1. This device may not cause harmful
interference, and
2. this device must accept any interference
received, including interference that may
cause undesired operation of the device.
Removal, tampering, or altering of the
device will void any warranties, and is not
permitted. Do not tamper with, alter, or use
in any non-approved way.
Any unauthorized modification to this
device could void the user's authority to
operate the equipment.
Radarsensors
The Active Blind Spot Assist radar sensors are
integrated into the front and rear bumpers
and behindacover in the radiator grill. Make
sure that the bumpers and the cover in the
radiator grill are free of dirt, ice or slush. The
rear sensors must not be covered, for
example by cycle racks or overhanging cargo.
Followingasevere impact or in the event of
damage to the bumpers, have the function of
the radar sensors checked ataqualified
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specialist workshop. Active Blind Spot Assist
may otherwise no longer work properly.
Monitoring area
GWARNING
Active Blind Spot Assist does not detect all
traffic situations and road users. There is a
risk of an accident.
Always make sure that there is sufficient
distance on the side for other traffic or
obstacles.
Active Blind Spot Assist monitors the area up
to 10 ft (3.0 m) behind your vehicle and
directly next to your vehicle, as shown in the
diagram.
The detection of obstacles can be impaired in
the case of:
Rdirt on the sensors or anything else
covering the sensors
Rpoor visibility, e.g. due to rain, snow or
spray
Vehicles in the monitoring range are then not
indicated or indicated withadelay.
Active Blind Spot Assist may not detect
narrow vehicles, such as motorcycles or
bicycles, or may only detect them too late.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may
be the case if there are vehicles at the edge
of their lane.
Due to the nature of the system:
Rwarnings may be issued in error when
driving close to crash barriers or similar
solid lane borders.
Rthe warning is canceled when driving for an
extended period next to long vehicles, such
as trucks.
Indicator and warning display
Yellowindicator lamp/red warning lamp
Active Blind Spot Assist is not active at
speeds below approximately 20 mph
(30 km/h). Vehicles in the monitoring range
are then not indicated.
When active Blind Spot Assist is activated,
indicator lampin the exterior mirrors lights
up yellow at speeds of up to
20 mph(30 km/h). At speeds above 20 mph
(30 km/h), the indicator lamp goes out and
active Blind Spot Assist is operational.
Ifavehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
20 mph (30 km/h), warning lampon the
corresponding side lights up red. This warning
is always given whenavehicle enters the
blind spot monitoring range from behind or
from the side. When you overtakeavehicle,
the warning only occurs if the difference in
speed is less than7mph (12km/h).
The yellow indicator lamp goes out if reverse
gear is engaged. In this event,Active Blind
Spot Assist is no longer active.
212Driving systems
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The brightness of the indicator/warning
lamps is adjusted automatically accordingto
the ambient light.
Visual and acoustic collision warning
If you switch on the turn signals to change
lanes andavehicle is detected in the side
monitoring range, you receiveavisual and
acoustic collision warning. You then hear a
double warning toneand red warning
lampflashes. If the turn signal remains on,
detected vehicles are indicated by the
flashing of red warning lamp.There are no
further warning tones.
Course-correcting brake application
GWARNING
Acourse-correctingbrake application cannot
alwayspreventacollision. There isarisk of
an accident.
Always steer, brake or accelerate yourself,
especially if Active Blind Spot Assist warns
you or makesacourse-correcting brake
application. Always maintainasafe distance
at the sides.
If Active Blind Spot Assist detectsarisk 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.
Ifacourse-correcting brake application
occurs, red warning lampflashes in the
exterior mirror andadual warning tone
sounds. In addition, the display shown in the
lower image appears in the multifunction
display.
In very rare cases, the system may make an
inappropriate brake application. An
inappropriate course-correcting brake
application may be interrupted at any time if
you steer slightly in the opposite direction or
accelerate, for example.
The course-correcting brake application is
available in the speed range between
20 mph (30 km/h) and 120 mph (200 km/h).
Either no braking application, oracourse-
correcting brake application adapted to the
driving situation occurs if:
Rthere are vehicles or obstacles, e.g. crash
barriers, located on both sides of your
vehicle.
Ravehicle approaches you too closely at the
side.
Ryou have adoptedasporty driving style with
high cornering speeds.
Ryou clearly brake or accelerate.
Radriving safety system intervenes, e.g.
ESP®or PRE-SAFE®Brake.
RESP®is switched off.
Raloss of tire pressure oradefectivetire is
detected.
Switching on Active Blind Spot Assist
XMake sure that the radar sensor system
(Ypage 232) and Active Blind Spot Assist
(Ypage 228) are activated in the on-board
computer.
XTurn the SmartKey to position2in the
ignition lock.
Warning lampsin the exterior mirrors
light up red for approximately
1.5 seconds and then turn yellow.
Driving systems213
Driving and parking
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Active LaneKeeping Assist
Generalnotes
Active LaneKeepingAssistmonitorsthe area
in front of your vehicle by means of
cameraat the top of the windshield. Active
Lane Keeping Assist detectslane markings on
theroad and warnsyou before you leave your
lane unintentionally. If you do notreact to the
warning,alane-correctingapplication of the
brakes can bring the vehicle back intothe
original lane.
If you have chosen the functionDisplay
Unit Speed-/Odometer:(Ypage 229)and
selected the display unitkmin the on-board
computer, Active Lane Keeping Assist
supports you fromaspeed of 60 km/h. If
milesis selected as the display unit, the
assistancerange begins at 40 mph.
For Active Lane Keeping Assist to assist you
when driving, the radar sensor system must
be operational.
Important safetynotes
If you fail to adapt your driving style, Active
Lane Keeping Assist can neither reduce the
risk of accidentnor override the laws of
physics. Active Lane Keeping Assist cannot
take into account road, weather or traffic
conditions. It cannot detect possible road and
traffic conditions. Active Lane Keeping Assist
is only an aid. You are responsible for the
distance to the vehicle in front,for vehicle
speed, for braking in good time and for
staying in your lane.
Active Lane Keeping Assist cannot
continuously keep your vehicle in its lane.
GWARNING
Active Lane Keeping Assist cannot always
clearly detect lane markings.
In such cases, Active Lane Keeping Assist
can:
Rgive an unnecessary warning and then
makeacourse-correcting brake application
to the vehicle
Rnot giveawarning or intervene
There isarisk of an accident.
Always pay particular attention to the traffic
situation and keep within the lane, especially
if Active Lane Keeping Assist alerts you.
Terminate the intervention inanon-critical
driving situation.
The system may be impaired or may not
function if:
Rthere is poor visibility, e.g. due to
insufficient illumination of the road, or due
to snow, rain, fog or spray
Rthere is glare, e.g. from oncoming traffic,
the sun or reflections (e.g. when the road
surface is wet)
Rthe windshield is dirty, fogged up, damaged
or covered, for instance byasticker, in the
vicinityofthe camera
Rthe radar sensors in the front or rear
bumper or in the radiator grill are dirty, e.g.
due to snow
Rthere are no, several or unclear lane
markings foralane, e.g. in areas with road
construction work
Rthe lane markings are worn away,dark or
covered up, e.g. by dirt or snow
Rthe distance to the vehicle in front is too
small and the lane markings thus cannot be
detected
Rthe lane markings change quickly, e.g.
lanes branch off, cross one another or
merge
214Driving systems
Driving and parking

Rthe roadisnarrow and winding
Rthere arestrong shadows castonthe lane
If no vehicle is detected in the adjacent lane
and there are broken lane markings detected,
no lane-correcting brake application is made.
Warning vibration in the steering wheel
Awarning may be given ifafront wheel
passes overalane marking. It will warn you
by means of intermittent vibration in the
steering wheel for up to 1.5 seconds.
Lane-correcting brake application
GWARNING
Alane-correcting brake application cannot
always bring the vehicle back into the original
lane. There isarisk of an accident.
Always steer, brake or accelerate yourself,
especially if Active Lane Keeping Assist warns
you or makesalane-correcting brake
application.
GWARNING
Active Lane Keeping Assist does not detect
traffic conditionsorroad users. In very rare
cases, the system may make an inappropriate
brake application, e.g. after intentionally
driving overasolid lane marking. There is a
risk of an accident.
An inappropriate brake application may be
interrupted at any time if you steer slightly in
the opposite direction. Always make sure that
there is sufficient distance on the side for
other traffic or obstacles.
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.
Ifalane-correcting brake application occurs,
displayappears in the multifunction
display.
This function is available in the range between
40 mph and 120 mph (60 km/h and
200 km/h).
Alane-correcting brake application can only
be made after driving overasolid,
recognizable lane marking. Before this, a
warning must be given by means of
intermittent vibration in the steering wheel.
In addition,alane with lane markings on both
sides must be recognized. The brake
application also slightly reduces vehicle
speed.
iAfurther lane-correcting brake
application can only occur after your
vehicle has returned to the original lane.
No lane-correcting brake application occurs
if:
Ryou clearly and actively steer, brake or
accelerate.
Ryou cut the corner onasharp bend.
Ryou have switched on the turn signals.
Radriving safety system intervenes, e.g.
ESP®,PRE-SAFE®Brake or Active Blind
Spot Assist.
Ryou have adoptedasporty driving style with
high cornering speeds or high rates of
acceleration.
RESP®is switched off.
Rthe transmission is not in positionD.
Raloss of tire pressure oradefective tire has
been detected and displayed.
Active Lane Keeping Assist may is unable to
detect other road or traffic conditions. An
inappropriate brake application may be
interrupted at any time if you:
Driving systems215
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Rsteer slightly in the opposite direction
Ruseaturn signal
Rclearly brake or accelerate
Alane-correcting brakeapplicationis
interrupted automatically if:
Radrivingsafetysystem intervenes,e.g.
ESP®,PRE-SAFE®Brake or ActiveBlind
Spot Assist.
Rlane markings can no longer be recognized.
Switching on Active Lane Keeping Assist
XSwitch on ActiveLane KeepingAssist using
the on-board computer;todoso, select
StandardorAdaptive(Ypage 229).
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected,
the lines in the assistancegraphicsdisplay
(Ypage 227)are shown in green.Lane
KeepingAssist is ready for use.
IfStandardis selected, no warning
vibration occurs if:
Ryou have switched on the turnsignals.In
thisevent, the warnings aresuppressed
foracertainperiodoftime.
Radriving safety systemintervenes, such
as ABS, BAS or ESP®.
IfAdaptiveis selected, no warning
vibrationoccurs if:
Ryouhaveswitched on the turnsignals.In
thisevent, the warnings aresuppressed
foracertainperiodoftime.
Radriving safety systemintervenes, e.g.
ABS, BAS or ESP®.
Ryouaccelerate hard, e.g.kickdown.
Ryou brakehard.
Ryou steer actively, e.g. swervetoavoid
an obstacle or change lanes quickly.
Ryou cut the corner onasharp bend.
In order that you are warnedonly when
necessary and in good timeifyou cross the
lane marking, the system recognizes certain
conditions and warns you accordingly.
The warning vibration occurs earlier if:
Ryou approach the outer lane marking on a
bend.
Rthe road has very wide lanes, e.g. a
highway.
Rthe system recognizes solid lane markings.
The warning vibration occurs later if:
Rthe road has narrow lanes.
Ryou cut the corner onabend.
216Driving systems
Driving and parking

Useful information............................218
Importantsafetynotes....................218
Displays and operation....................219
Menus and submenus......................222
Display messages.............................237
Indicator and warning lampsinthe
instrument cluster............................264
217
On-boar dc omputer and displays

Useful information
iThis Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please notethat your vehicle may
not be equipped with all features
described. This also applies to safety-
related systemsand functions.
iRead the information on qualified
specialist workshops: (Ypage 26).
Important safetynotes
GWARNING
If you operate information systemsand
communication equipment integrated in the
vehicle while driving, you will be distracted
from traffic conditions. You could also lose
controlofthe vehicle. There isarisk of an
accident.
Only operate the equipment when the traffic
situationpermits.Ifyou are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the
equipment when the vehicle is stationary.
GWARNING
If the instrument cluster has failed or
malfunctioned, you may not recognize
function restrictions in systems relevant to
safety. The operating safety of your vehicle
may be impaired. There isarisk of an
accident.
Drive on carefully. Have the vehicle checked
ataqualified specialist workshop
immediately.
You must observe the legal requirements for
the country in which you are currently driving
when operating the on-board computer.
The on-board computer only shows messages
or warnings from certain systems in the
multifunction display.You should therefore
make sure your vehicle is operating safely at
all times. Otherwise,avehicle that is not
operating safely may cause an accident.
For an overview, see the instrument panel
illustration (Ypage 31).
218Important safety notes
On-board computer and displays

Displaysandoperation
Instrument cluster
Speedometer withsegments (Ypage 220)
Multifunction display (Ypage 221)
$Tachometer (Ypage 219)
!Coolant temperature (Ypage 219)
Fuelgauge
Coolant temperaturedisplay
GWARNING
Opening thehoodwhen theengineis
overheated or when there isafireinthe
enginecompartmentcould expose you to hot
gases or other service products. There is a
risk of injury.
Let an overheated engine cool down before
opening the hood. If there isafire in the
engine compartment, keep the hood closed
and contact the fire department.
!Adisplay message is shown if the coolant
temperature is too high.
If the coolanttemperature is over
248 ‡(120 †), do not continue driving. The
engine will otherwise be damaged.
The coolanttemperature gauge is in the
instrument cluster on the left-hand side
(Ypage 31).
Under normal operatingconditions and with
the specified coolant level, the coolant
temperature may rise to 248‡(120 †).
Tachometer
!Do not drive in the overrevving range, as
this could damage the engine.
The red band in the tachometer indicates the
engine's overrevving range.
The fuel supply is interrupted to protectthe
engine when the red band is reached.
Displays and operation219
On-board computer and displays
Z

Outsidetemperature display
You should pay special attention to road
conditions when temperatures are around
freezing point.
The outside temperature display is in the
multifunction display (Ypage 221).
Changes in the outside temperature are
displayed afterashort delay.
Speedometer with segments
The segments in the speedometer indicate
which speed range is available.
RCruise control activated (Ypage 175):
The segments light up from the stored
speed to the maximum speed.
RDISTRONIC PLUS activated (Ypage 177):
One or two segments in the set speed
range light up.
RDISTRONIC PLUS detectsavehicle in front:
The segments between the speed of the
vehicle in frontand the stored speed light
up.
Operatingthe on-board computer
Overview
Multifunctiondisplay
Right control panel
$Switches on the VoiceControl System;
see the separateoperating instructions
!Backbutton
Left control panel
XTo activatethe on-board computer:turn
the SmartKey to position1in the ignition
lock.
You can control the multifunction displayand
the settings in the on-board computer using
the buttons on the multifunction steering
wheel.
220Displays and operation
On-board computer and displays