Note■If the proximity is changed in infotainment, the change will only come into
effect after a subsequent activation of the ACC.■
The proximity is dependent on the speed. The higher the speed, the greater
the proximity to the vehicle ahead.
■
On wet roads, a longer time interval to the vehicle ahead should always be
selected than on dry roads.
Special driving conditions
Fig. 152
Special conditions: Cornering / narrow vehicles or vehicles travel-
ling side by side
Fig. 153
Special conditions: Lane changes of other vehicles / stationary
vehicles
Read and observe
and on page 150 first.
The following and similar situations require special attention of the driver.
When cornering
When driving around long bends the ACC may respond to a vehicle in the adja-
cent lane » Fig. 152 -
. Your own vehicle is regulated with respect to this ve-
hicle and will no longer respond to the vehicle ahead.
In such cases, control should be disabled by accelerating, applying the brake or
pressing the button on the operating lever .
» Fig. 151 on page 152 .
Narrow vehicles or vehicles travelling side by side
Narrow vehicles or vehicles travelling side by side are not detected by the ra-
dar sensor until they are within the sensor's range » Fig. 152 -
.
If necessary, slow down the car by applying the brake.
Other vehicles changing lanes
Vehicles that change onto the lane with a small proximity » Fig. 153 -
do not
have to be detected by the radar sensor in time. The result may be a delayed
ACC response.
If necessary, slow down the car by applying the brake.
Stationary vehicles
The ACC does not detect stationary objects! When a vehicle detected by the
ACC turns or sheers off and there is a stationary vehicle in front of this vehi-
cle, » Fig. 153 -
the ACC does not respond to the stationary vehicle.
In such cases, take over the steering and stop the vehicle by applying the foot
brake.
When overtaking
When your vehicle is being controlled (the speed is lower than that which is
stored) and the indicator is activated, the ACC interprets this situation as
meaning that the driver intends to overtake. The ACC automatically acceler-
ates the vehicle, thereby reducing the proximity to a vehicle ahead.
If the vehicle changes to the fast lane and no vehicle is detected ahead, the
ACC accelerates until the set speed is reached and then keeps it constant.
Acceleration can be cancelled at any time by touch on the brake pedal or
pressing the button on the lever
» Fig. 151 on page 152 .
Vehicles with special load or special body parts
Other vehicles with a load or with body parts protruding from the sides, back
or top of the vehicle contour may not be detected by the ACC.
Control should therefore be disabled whenever you are driving behind or over-
taking such a vehicle. 154Driving
Towing a trailer
When towing a trailer, the ACC control will be less powerful. The manner of
driving should therefore be adapted to this limitation.
Information messages
Read and observe
and on page 150 first.
The information messages are shown in the instrument cluster display. ACC: No sensor view!
The sensor is dirty or has no “visibility”. Stop the car, switch off the engine and
clean the sensor or remove the obstacle causing the lack of “visibili-
ty” » Fig. 148 on page 150 . Should the ACC still be unavailable after the engine
is restarted, push the lever into
» Fig. 151 on page 152 position. Seek help
from a specialist garage.
ACC not available.
Stop the vehicle, switch off the engine and then start it again. If the ACC is still
not available, push the lever into position . Seek help from a specialist ga-
rage.
Error: ACC
There is an ACC system error. Push the lever into position . Seek help from a
specialist garage.
Speed limit
Increase the speed accordingly and start control » page 152.
Front Assistant
Introduction
This chapter contains information on the following subjects:
Radar sensor
155
Operation
156
proximity warning (dangerous proximity)
156
Warning and automatic braking
156
Activating/deactivating
157
Information messages
157The Front Assistant (from here on only referred to as the system) warns you of
the danger of a collision with a vehicle or another obstacle in front of the vehi-
cle, and tries to avoid a collision or mitigate its consequences by automatically
applying the brakes where necessary.
The area in front of the vehicle is monitored by a radar sensor » Fig. 154 on
page 155 .WARNING■
The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
The system has physical and system-related limitations. For this reason,
the driver may experience some undesired or delayed system responses in
certain situations. You should therefore always be alert and ready to inter-
vene!
■
Always adapt your speed and safety proximity to the vehicle ahead to the
current visibility, weather, road and traffic conditions.
■
The increased passenger protection afforded through the system must
not tempt you to take greater risks than otherwise – risk of accident!
■
The system does not respond to crossing or oncoming objects.
CAUTION
In case of failure of more than one brake light on the vehicle or on the electri-
cally connected trailer, the system becomes unavailable.
Radar sensor
Fig. 154
Mounting location of the radar
sensor
Read and observe and on page 155 first.
The radar sensor » Fig. 154(hereinafter referred to simply as the sensor) can
detect objects by emitting and receiving electromagnetic waves.
155Assist systems
The sensor function may be impaired in the events of one of the following.
› The sensor is soiled by mud, snow etc.
› The area in front and around the sensor is obscured by labels, auxiliary lights
or similar items.
› Visibility is poor, (e.g. fog, heavy rain, thick snowfall).
If the sensor is dirty or covered, the corresponding message appears on the
display of the instrument cluster » page 157, Information messages .WARNING■
If you suspect that the sensor is damaged, deactivate the system. Have
the sensor checked by a specialist garage.■
The sensor can become misaligned by collisions or by damage to the front
of the vehicle, the wheel arch or the underside of the vehicle. This can lead
to impaired function of the sensor - risk of accidents! Have the sensor
checked by a specialist garage.
■
The area in front and around the sensor should not be obscured by labels,
auxiliary lights or similar items. This can lead to impaired function of the
sensor - risk of accidents!
CAUTION
Remove the snow with a brush and the ice with a solvent-free de-icer.
Operation
Fig. 155
Instrument cluster display: Note
(dangerous distance)advance /
warning or emergency braking at
low speed
Read and observe and on page 155 first.
The system support is provided in the following manner.
› Alerts you about a dangerous proximity to the vehicle ahead.
› Warns you of an impending collision.
› Prepares the brakes for emergency braking prior to a detected danger.
›Assists with a brake action triggered by the driver.
› If the driver fails to respond to a detected danger, automatic braking is per-
formed.
The system can work only if the following basic conditions are met. The system is activated.
TCS is enabled » page 138, Braking and stabilisation systems .
The vehicle is traveling forwards at a speed of more than approx. 5 km/h.
Note
The system can be impaired or may not be available, for example when driving
in “sharp ”curves or with an ESC engagement » page 138.
proximity warning (dangerous proximity)
Read and observe
and on page 155 first.
If a safe distance to the vehicle ahead is not maintained, the display of the in-strument cluster shows the symbol
» Fig. 155 on page 156 -
.
Immediately increase the proximity if the current traffic situation allows you
to do so!
The proximity at which the warning is displayed depends on the current speed.
The warning may occur when driving between about 60 km/h and 210 km/h.
Warning and automatic braking
Read and observe
and on page 155 first.
Emergency braking at low speed
In a driving speed range of approx. 5 km/h to approx. 30 km/h, the automatic
braking action is not preceded by a warning. In the event of an immediate risk
of impact, automatic braking is carried out with the breaking force increasing
in stages.
The symbol
» Fig. 155 on page 156 -
appears in the display during auto-
matic braking
Advance warning
If the system detects a risk of collision, the symbol
» Fig. 155 on page 156 -
appears in the display and you will hear an acoustic signal.
At the same time, the braking system is prepared for possible emergency brak-
ing.
156Driving
The pre-warning display can occur in the following situations.› If there is a risk of collision with a moving obstacle at a driving speed range
of approx. 30 km/h to approx. 210 km/h.
› If there is a risk of collision with a stationary obstacle at a driving speed
range of approx. 30 km/h to approx. 85 km/h.
When the advance warning is issued, the brake pedal must be pressed or the
moving obstacle avoided!
Acute alert
If the driver does not react to the advance warning, the system briefly applies
the brake automatically via an active brake intervention to draw attention to
the potential danger of a collision again.
Automatic Braking
If the driver fails to respond to the acute warning, the system starts to apply
the brakes automatically with increasing stopping power in several stages.
Brake Support
If the driver does not brake sufficiently in the event of an impending collision,
the system automatically increases the braking force.
The brake support only occurs as long as the brake pedal is being firmly press-
ed down.
Note
■ If an automatic brake intervention is triggered by the system, the pressure in
the brake system increases and the brake pedal cannot be operated with the
normal pedal stroke.■
The automatic braking interventions can be cancelled by pressing the accel-
erator pedal or by means of a steering intervention.
Activating/deactivating
Read and observe
and on page 155 first.
The function is automatically activated each time the ignition is switched on.
The system should only be disabled in exceptional cases »
.
The system can be activated or deactivated in one of two ways. › In the instrument cluster display
» page 51, Menu item wizard .
› In Infotainment
» Infotainment operating instructions , chapter Vehicle set-
tings (CAR button) .
The following functions can be activated or deactivated separately in infotain-
ment.
› Distance warning
› Advance warning
Once one of these functions has been deactivated, it remains disabled even
after switching the ignition off and on.WARNINGIn the following situations, Front Assistant should be deactivated for safety
reasons.■
When the vehicle is being towed away.
■
When the vehicle is on a rolling test bench.
■
If an unfounded warning was issued or a system action carried out.
■
When on a truck, car ferry or similar.
Information messages
Read and observe
and on page 155 first.
The information messages are shown in the instrument cluster display. Front Assist: No sensor view.
The sensor is soiled or covered.
Stop the vehicle, switch off the engine and clean the sensor or remove the
item causing the lack of visibility » Fig. 154 on page 155 .
If the message appears again after starting the engine, the system should be disabled » page 157 . Seek help from a specialist garage.
Front Assist not available.
The system is not available for an unknown reason.
Stop the vehicle, switch off the engine and then start it again.
If the message appears again after starting the engine, the system should be
disabled » page 157 . Seek help from a specialist garage.
157Assist systems
Information messagesRead and observe
on page 158 first.
The information messages are shown in the instrument cluster display. Start the engine manually!
START MANUALLY
One of the conditions for automatic engine start is not satisfied or the driver's
seat belt is not fastened. The engine must be started manually.
On vehicles with the starter button, the ignition is turned off by the first press of the starter button; the start process is only initiated when the button is
pressed for the second time.
Error: start-stop system
START STOP ERROR
A system error is present. Seek help from a specialist garage.
Selection of travel mode (Driving Mode Selection)
Introduction
This chapter contains information on the following subjects:
Selection
160
Normal Mode
160
Sportmode
160
Ecomode
161
Individualmode
161
By selecting the driving mode, the driving behavior can be adapted to the de-
sired mode of operation.
The following modes of Normal, Sport, Eco, Individual are available.
The set driving mode remains stored even after switching the ignition on and
off.
WARNING■ The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Adjust the speed and driving style to the current visibility, weather, road
and traffic conditions.
SelectionFig. 158
Button for selecting the driving mode: Version 1/version 2
Read and observe
on page 160 first.
›
Press the symbol button or
» Fig. 158 .
The menu is displayed on the infotainment screen.
The mode is changed by repeatedly pressing the symbol button or
or in
the Infotainment display » Infotainment operating instructions , chapter Vehi-
cle settings .
If a driving mode other than Normal is selected, then the symbol lights up on
the button or
» Fig. 158 .
WARNINGSetting the driving mode while driving can distract you from other traffic –
risk of accident.
Normal Mode
Read and observe
on page 160 first.
This mode is suitable for common everyday use.
SportmodeRead and observe
on page 160 first.
This mode is suitable for a sporty driving style.
Selecting this mode primarily affects the function of the following systems.
160Driving
WARNING■The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Lane Assist can help you keep the vehicle within the lane. However, it
does not steer the vehicle for you. The driver retains full responsibility for
steering at all times.
■
Some objects on the road may be incorrectly detected as lines. As a re-
sult, an incorrect steering intervention may take place.
WARNINGThe detection capability of the camera may be limited by various external
influences. In such cases, the assistant may not detect the line between
two lanes at all or not properly. The detection capability of the camera may
be restricted in the following situations, for example.■
When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
■
When driving around “sharp” bends.
■
The camera is blinded by the sun.
■
The camera is blinded by the oncoming traffic.
■
The viewing range of the camera is impeded by a vehicle traveling ahead.
■
The camera viewing range is obstructed by an obstacle.
CAUTION
Do not attach any stickers or similar objects to the windscreen to avoid impair-
ing the functions of the Assist system.
Note
■ The system is designed for driving on motorways and roads with adequate
longitudinal markings.■
The system can detect both continuous and broken lines.
OperationFig. 160
Monochromatic display of the instrument cluster: Examples of
system indications
Fig. 161
Colour display of the instrument cluster: Examples of system in-
dications
Read and observe
and on page 163 first.
System displays » Fig. 160 » Fig. 161
The system is active, but not ready to intervene.
The system is active and ready to intervene.
The system intervenes when approaching the right-hand boundary lane.
Adaptive lane assist ensues (boundary lines on both sides of the vehicle
detected).
The system can intervene when the following basic conditions are present. The system is activated.
The vehicle is travelling at more than 65 km/h.
ABCD163Assist systems
The boundary lines are clearly visible (appropriate longitudinal markings).
The boundary line of at least one side of the lane is detected.
The driver's hands are on the steering wheel.
The lane is more than 2.5 m in width.
If the turn signal is switched on prior to driving over the boundary line (e.g.
when making a turn), no steering intervention takes place when the vehicle
approaches the boundary line. The system regards the situation as an inten-
ded lane change.
Warning lights in the instrument clusterWarning lightMeaningThe system is active, but not ready to intervene.The system is active and ready to intervene or is currently
intervening.
Adaptive lane assist
Adaptive lane assist helps to keep the vehicle in the position between the
boundary lines selected by the driver, by means of steering intervention.
If the system detects only one boundary line, it will help to maintain the selec-
ted proximity from said boundary line.
If the proximity to the detected boundary line is changed, the system quickly
adapts and maintains the newly-selected position.
WARNINGThe function of adaptive lane guidance Assist system may be restricted
when driving e.g. over rutted roads, on a slope, or if there are lateral winds.
Activating/deactivating
Read and observe
and on page 163 first.
The activation or deactivation of the system can be carried out in one of two
ways.
› In the
Assist systems menu item in the instrument cluster display » page 51,
Menu item wizard .
› In Infotainment
» Infotainment operating instructions , chapter Vehicle set-
tings (CAR button) .
Adaptive tracking can also be enabled or disabled In Infotainment.
Information messages
Read and observe
and on page 163 first.
The information messages are shown in the instrument cluster display. Lane Assist not available. No sensor view.
The windscreen is dirty, iced over or misted up in the camera viewing range.
Clean the windscreen or remove the obstacles.
Lane Assist currently not available.
The system has limited functionality due to a temporary error. Try to re-acti-
vate the machine.
Error: Lane Assist
There is a system error. Seek help from a specialist garage. Lane Assist: Take over steering!
The system has detected that there are no hands on the steering wheel. In
this case, the Assist system is not ready to intervene. Place your hands on the
steering wheel.
Traffic sign recognition
Introduction
This chapter contains information on the following subjects:
Function
165
Additional display
166
Traffic sign display when towing a trailer
166
Information messages
166
The traffic sign recognition system (hereinafter referred to only as system)
shows certain traffic signs on the display of the instrument cluster.
WARNING■ The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Vertical traffic signs must always take precedence over the traffic signs
shown in the display. The driver is always responsible for correctly assess-
ing the traffic situation.
164Driving
Additional displayRead and observe
on page 164 first.
If the menu item Road sign is currently not shown » Fig. 163 on page 165 -
,
the road sign with the speed limit will appear in the upper display area of the
instrument cluster » Fig. 163 on page 165 -
,
.
If several traffic signs are detected simultaneously, the next traffic sign will al- so in some cases be displayed in the colour display -
. All detected traffic
signs can be displayed in the menu item Road sign -
.
The additional display traffic sign detection can be activated/deactivated in
the Infotainment » operating instructions for Infotainment , chapter Vehicle
settings (CAR button) .
Traffic sign display when towing a trailer
Read and observe
on page 164 first.
When towing a trailer, displaying the traffic signs which apply when towing atrailer can be activated.
The traffic sign detection display when towing a trailer can be activated/deac-
tivated in the Infotainment » operating instructions for Infotainment , chap-
ter Vehicle settings (CAR button) .
Information messages
Read and observe
on page 164 first.
The information messages are shown in the instrument cluster display. No road signs available.
No maximum speeds were recognised (e.g. on German motorways where there
is no speed limit).
Error: Dynamic Road Sign Display
There is a system error. Seek help from a specialist garage. Dynamic Road Sign Display clean windscreen!
The windscreen is dirty, iced over or misted up in the camera viewing range.
Clean the windscreen or remove the obstacles.
Dynamic Road Sign Display currently restricted.
Infotainment Navigation is not currently providing any data. Check whether
the maps are up-to-date or the whether the vehicle is currently in a location
for which no navigation data are available.
Fatigue detection (break recommendation)
Introduction
This chapter contains information on the following subjects:
Function
166
Information messages
167
The fatigue detection system (hereinafter referred to only as system) recom-
mends the driver taking a break from driving when, because of the driver's
steering behavior, driver fatigue can be detected.
WARNING■ For the driving ability is always the driver's responsibility. Never drive if
you feel tired.■
The system may not detect all cases where a break is needed.
■
Therefore, take regular, sufficient breaks during long trips.
■
There will be no system warning during the so-called micro-sleep.
Note
■ In some situations, the system may evaluate the driving incorrectly and thus
mistakenly recommend a break (e.g. sporty driving, adverse weather condi-
tions or poor road conditions).■
The system is designed primarily for use on motorways.
Function
Read and observe
on page 166 first.
From the start of the journey, the system evaluates steering behavior. If, while
driving, there have been changes in the steering behaviours that are evaluated
by the system as indicating possible fatigue, a break recommendation is is-
sued.
The system evaluates steering behavior and recommends a break at speeds of
65-200 km / h.
166Driving