When cornering
When driving into or driving out of long corners, it could be that a vehicle is
travelling in the adjacent lane and is scanned by the radar » Fig. 297 -
. The
host vehicle is then controlled according to this vehicle.
Narrow vehicles or vehicles travelling side by side
A narrow or offset vehicle driving can only be recognized by the ACC if this is
located in the scanning range of the radar » Fig. 297 -
.
Other vehicles changing lanes
Vehicles that change onto the lane with a small distance » Fig. 298 -
may not
be detected by ACC in good time.
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. 298 -
the ACC does not respond to the stationary vehicle.
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.
Overtaking and towing
Read and observe
on page 233 first.
When overtaking
When your vehicle is being controlled at a speed that is lower than the set
speed and the turn signal is operated, ACC assesses this situation as meaning
that the driver wishes to overtake. The ACC automatically accelerates the vehi-
cle, thereby reducing the proximity to a vehicle ahead.
If your vehicle changes to the overtaking lane and no vehicle is detected
ahead, ACC accelerates until the set speed is reached and then keeps it con-
stant.
Acceleration can be cancelled at any time by touch on the brake pedal or
pressing the button on the lever
» Fig. 296 on page 235 .
Towing a trailer
When towing, or if another accessory is connected to the trailer socket, ACC
control is set with a lower rate. The manner of driving should therefore be
adapted to this limitation.
Malfunctions
Read and observe
on page 233 first.
If, for some unknown reason, ACC is not available, the warning light
appears
in the display of the instrument cluster and an appropriate message is shown.
Sensor covered / dirty
If the sensor cover or the sensor is dirty or covered, a message appears on the
instrument cluster display stating there is no sensor view. Clean the sensor
cover or remove the obstacles » Fig. 264 on page 212 .
If there is no sensor view in the winter, the snow on the sensor under the cov- er could be the reason. The ACC is functional again after the snow melts away
from the sensor.
ACC not available
If the ACC is currently unavailable, a message concerning the unavailability ap-
pears. Stop the vehicle, switch off the engine and then start it again. If ACC
continues to be unavailable, seek the assistance of a specialist garage.
ACC fault
With an ACC fault, an error message appears. Seek help from a specialist ga-
rage.
Front Assist
Introduction
This chapter contains information on the following subjects:
Settings in Infotainment
238
Operation
238
Distance warning
238
Warning and automatic braking
238
Deactivation/activation
239
Malfunctions
240
The Front Assist (hereinafter referred to as the system) warns you of the dan-
ger of a collision with a vehicle or another obstacle in front of the vehicle, 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 » page 212.
237Assist systems
WARNING■Please take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .■
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.
Settings in Infotainment
Read and observe
and on page 238 first.
›
Press the button, then tap on the function surface
→
Driver assistance
.
■ Front Assist (ambient traffic monitor. sys.) - Set the assistant for distance
monitoring to the vehicles ahead ■
Active
- Activate/deactivate the assistant
■
Advance warning
(Version 1) - Activate/deactivate advance warning
■
Advance warning
(Version 2) - Activating/deactivating and setting the distance
level at which a warning occurs
■
Display distance warning
- Activate/deactivate distance warnings
Operation
Read and observe
and on page 238 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.
▶ Assists with a brake action triggered by the driver.
▶ If the driver fails to respond to a detected danger, an automatic braking ac-
tion is performed.
The system can work only if the following basic conditions are met. The system is activated.
TCS is activated » page 214.
The vehicle is travelling 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 213.Distance warningFig. 299
Display of the instrument cluster: Proximity warning
Read and observe and on page 238 first.
The display of the distance warning is for vehicles with MAXI DOT display.
If a safe distance from the vehicle ahead is fallen short of, the warning light
appears in the display
» Fig. 299 .
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
Fig. 300
Instrument cluster display: Advance warning or emer-
gency braking at low speed
Read and observe and on page 238 first.
Emergency braking at low speed
If there is a risk of collision in a vehicle speed range of about 5 km/h to 45
km/h, the system triggers an automatic braking.
With automatic braking, the warning light appears in the display
» Fig. 300 .
238Driving
Advance warning
If the system detects a risk of collision, the warning light appears on the dis-
play
» Fig. 300 and an audible signal is emitted.
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.
With a warning the brake pedal must be pressed or the moving obstacle is to
be avoided!
Acute alert
If the driver does not react to the advance warning when in danger of a colli-
sion with a moving obstacle, 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 does not respond to acute warning, the system begins to auto-
matically brake the vehicle.
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 acceler-
ator pedal or by means of a steering intervention.
Brake assist
If the driver brakes inadequate with an impending collision, the system auto-
matically increases braking force.
The braking assistance only occurs as long as the brake pedal is being firmly
pressed down.Deactivation/activationFig. 301
Buttons / dial: on the operating lever / the multifunction steer-
ing wheel
Read and observe
and on page 238 first.
The system is automatically activated each time the ignition is switched on.
The system should only be disabled in exceptional cases »
.
On vehicles with the MAXI DOT display, the system can be activated/deactiva- ted in the main menu » page 48, Menu item
Assist systems
.
Deactivation / activation in vehicles with segment display
Button
» Fig. 301ActionOperationBPressDeactivate/activate system
Deactivation / activation in vehicles with multi-function steering wheel
Button / dial
» Fig. 301ActionOperation
CPressShow Front Assist menu itemDPressDeactivate/activate system
Disable / enable and setting in the Infotainment
In Infotainment, the entire system or the function advance warning and dis-
tance warning can be deactivated/activated » page 238, Settings in Infotain-
ment .
The distance-warning function was deactivated before the ignition was
switched off, it remains deactivated after the ignition is switched on again.
239Assist systems
WARNINGIn the following situations, Front Assist should be switched off for safety
reasons.■
When the vehicle is being towed away.
■
When the vehicle is on a rolling test bench.
■
If an unfounded warning or a system action was taken.
■
When on a truck, or a car ferry service or similar.
Malfunctions
Read and observe
and on page 238 first.
If, for some unknown reason, the system is not available, an appropriate mes-
sage appears in the display of the instrument cluster.
Sensor covered / dirty
If the sensor cover or the sensor is dirty or covered, a message appears on the
instrument cluster display stating there is no sensor view. Clean the sensor
cover or remove the obstacles » Fig. 264 on page 212 .
If there is no sensor view in the winter, the snow on the sensor under the cov- er could be the reason. The system is functional again after the snow melts
away from the sensor.
System unavailable
If the system is currently unavailable, a message concerning the unavailability
appears. Stop the vehicle, switch off the engine and then start it again. If the
system still is not available, seek the assistance of a specialist garage.
Select the driving mode (Driving Mode Selection)
Introduction
This chapter contains information on the following subjects:
Adaptive Chassis Control (DCC)
240
mode
Eco240
Mode
Comfort241
Mode
Normal241
Mode
Sports241
Mode
individual241Mode selection and Infotainment display241Settings for individual
mode242
By selecting the driving mode, the driving behaviour can be adapted to the de-
sired mode of operation.
the following modes
Eco
.
Comfort
.
normal
.
Sports
and
individual
are available.
The mode
Comfort
is only available on vehicles with adaptive chassis control
(DCC).
WARNINGPlease take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .
Adaptive Chassis Control (DCC)
Read and observe
on page 240 first.
The adaptive chassis control (following known as DCC) provides the ability to
adjust the shock characteristics for the sporty, normal or comfortable driving
when the corresponding control mode is selected.
The DCC evaluates steering response and road conditions while driving contin- uously and adjusts the suspension behaviour within the selected driving mode
accordingly.
mode
Eco
Read and observe on page 240 first.
This mode is suitable for a relaxed style of driving and helps to save fuel.
Selecting this mode primarily affects the function of the following systems.
Drive
Vehicle acceleration is more relaxed than in
Normal
mode.
The recommended gear is controlled such to achieve the lowest possible fuel
consumption » page 44.
If the START-STOP system is deactivated manually » page 202, this will be au-
tomatically activated.
The automatic gearbox is set automatically to mode E » page 207 .
240Driving
Adaptive Cruise Control (ACC)
Acceleration occurs more relaxed than in Normal
» page 233 mode with distance
control.
Xenon headlight
The system is in economic mode » page 69. The headlamps are in basic setting
and do not adapt to the direction of travel.
Air conditioning (Climatronic)
The air conditioning is controlled so as to save energy. For this reason, for ex-
ample, it may take longer to reach the desired interior temperature in mode
Normal
.
Note
■ If a trailer or other accessory is to be connected to the trailer socket, driving
mode Eco
is not available.■
The maximum vehicle acceleration (kick down function) is possible also in
driving mode
Eco
.
Mode
Comfort
Read and observe on page 240 first.
This mode is suitable for driving on roads with poorer surface or for long mo-
torway journeys.
Mode
Normal
Read and observe on page 240 first.
This mode is suitable for a conventional driving.
Mode
Sports
Read and observe on page 240 first.
This mode is suitable for a sporty driving.
Selecting this mode primarily affects the function of the following systems.
DCC
The DCC adjusts the chassis for the sporty driving style.
Steering
The power steering is reduced slightly, i.e., the driver needs to exert more
force for steering .
Drive
The vehicle acceleration is more dynamic than in Normal
mode.
Adaptive Cruise Control (ACC)
The acceleration is quicker than in
Normal
mode with distance control
» page 233 .
Xenon headlight
The headlamps adapt to the driving style more dynamically than in mode
Nor-mal
» page 69 .
ProActive passenger protection
The first level of protection is deactivated » page 242.
Mode
individual
Read and observe on page 240 first.
In the mode
Individual
each system can be set independently » page 242, Set-
tings for individual
mode
.
Mode selection and Infotainment display
Fig. 302
Button for selecting the driving mode / Display in Infotainment
screen
Read and observe
on page 240 first.
Procedure for the selection of the driving mode
›
Press the
» Fig. 302 button.
241Assist systems
On the Infotainment screen a driving mode menu » Fig. 302 appears.
The mode is changed by repeatedly pressing the
button or by tapping the
corresponding function surface on the Infotainment screen.
If a driving mode other than Normal
is selected, then the symbol
illuminates
on the button.
If the mode
Sport
or
Individual
was set prior to the engine being switched off
(Drive - Sport), the drive changes to
Normal
mode after the engine is started. In
order to switch back to
Sport
, select mode
Sport
or
Individual
or set the selector
lever of the automatic transmission to mode S.
Functional surfaces on the screen » Fig. 302
Sets the mode
Individual
and information on the setting of the currently se-
lected mode
Cancel the menu to select driving mode
Modes (the surface of the selected mode is shown in green)
Note
■ The currently selected running mode is displayed in the Infotainment in the
status bar of the main menu of the symbol .■
The selected driving mode and the setting of the mode
Individual
is stored in
the active user account personalisation » page 49.
■
If the driving mode menu is not operated within a few seconds, the Infotain-
ment switches to the last selected menu or switches off.
Settings for individual
mode
Read and observe on page 240 first.
In the
Individual
mode, the following menu items can be set.
■
DCC:
- Set the shock characteristics
■
Steering:
- Set the power steering characteristics
■
Drive:
- set the drive characteristics
■
ACC:
- Set the vehicle acceleration when adaptive cruise control is activated
■
Dynamic cornering light:
- Set the characteristics of the Xenon headlights
■
Air conditioning:
- Set the Climatronic characteristics
■
Reset mode
- Setting for all menu items in the
Individual
mode to
Normal
■
Cancel
- Keep the current settings
■
Reset
- cancels all menu items in the
Normal
mode
ABCProactive occupant protection (Crew Protect Assist)
Introduction
This chapter contains information on the following subjects:
Function
242
ProActive passenger protection (following known as system) increases pas-
senger protection in the front seats in situations that could lead to vehicle im-
pact or overturning.
WARNINGPlease take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .
Note
■
The system component service life is monitored electronically. Further infor-
mation » page 37 , Safety systems .■
If the front passenger front airbag is deactivated, the belt tensioning func-
tion for the front passenger seat is switched off.
Function
Read and observe
on page 242 first.
In critical driving situations (e.g. during emergency braking or a sudden changein direction), the following steps can be taken separately or combined in order
to reduce the risk of serious injury.
▶ The front passenger's and driver's seatbelts, if worn, are automatically ten-
sioned closely over the body.
▶ Opened door windows in the front doors are closed automatically up to a gap
of about 5 cm from the edge.
▶ The sliding/tilting roof is closed.
Once the critical driving situation has passed, the tension on the seatbelts will
be released again.
The system operates at two levels of protection.
The first level of protection
The system already intervenes in situations that may occur during dynamic
driving. As a result, this primarily helps to keep the driver and the passenger in
the correct seated position.
242Driving
OperationFig. 304
Monochromatic display of the instrument cluster: Examples of
system indications
Fig. 305
Colour display of the instrument cluster: Examples of system in-
dications
Read and observe
and on page 243 first.
System displays » Fig. 304 and » Fig. 305
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 tracking takes place.
The system can intervene when the following basic conditions are present. The system is activated.
The vehicle is travelling at more than around 65 km/h 1)
.
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 (e.g. when turning), no steering intervention takes place when the vehicle approaches the boundary line. The system re-
gards the situation as an intended lane change.
Warning lights in the instrument cluster The system is active, but not ready to intervene.
The system is active and ready to intervene or is currently intervening.
Adaptive lane assist
Adaptive tracking helps to keep the vehicle in the position between the boun-
dary lines selected by the driver, by means of steering intervention.
If the position within the lane is changed, the system quickly adapts and holds
the newly-selected position.
Steering wheel vibrations
In the following situations, it may occasionally be the case that due to the
steering wheel vibrations the syst4em indicates that a driver steering inter-
vention is required.
▶ The system is not able to keep the vehicle by a within the lane due to a
steering intervention.
▶ During an intense system-related steering intervention, the system suddenly
cannot recognize the boundary lines.WARNINGThe system function may be restricted if, for example there is danger due
to ruts on a downhill road or in a crosswind.1)
Not valid for vehicles with the traffic jam assistant » page 245.
244Driving
Activation / deactivationRead and observe
and on page 243 first.
The activation/deactivation of the system can be carried out in one of two
ways. ▶ In the instrument cluster display » page 48, Menu item
Assist systems
.
▶ In Infotainment » page 243, Settings in Infotainment .
Adaptive tracking can also be enabled or disabled In Infotainment.
After switching off and switching on the ignition, the system setting is re-
tained.
Note
The system setting is stored (depending on the Infotainment type) in the ac-
tive user account personalisation » page 49.
Malfunctions
Read and observe
and on page 243 first.
If, for some unknown reason, the system is not available, an appropriate mes-
sage appears in the display of the instrument cluster.
Sensor covered / dirty
If the windscreen is dirty, iced or misted up in the sensor area, a message ap-
pears indicating that there is no sensor view. Clean the windscreen or remove
the obstacles from the sensor area.
System unavailable
If the system is currently unavailable, a message concerning the unavailability
appears. Try to re-activate the machine. If the system still is not available, seek
the assistance of a specialist garage.
System fault
In the case of a system fault, an error message appears. Seek help from a spe-
cialist garage.
Request to take over steering
If the system detects that there are no hands are on the steering wheel, this
will not work properly. You will be prompted to take over steering. Place your
hands on the steering wheel.
Traffic jam assistant
Introduction
This chapter contains information on the following subjects:
Function
245
Operating conditions
245WARNING■ Please take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .■
The driver must always have hands on the steering wheel and be ready to
take over steering of the vehicle himself (accelerate or brake).
Note
The system is designed primarily for use on motorways.
Function
Read and observe
on page 245 first.
The traffic jam assistant (referred to as system) helps to keep the vehicle with-
in the lane at speeds below 65 km/h while keeping the distance to the vehicle
ahead.
The system is only available for vehicles with Automatic transmission.
The traffic jam assistant is an extension of the systems Lane Assist » page 243
and ACC » page 233 and works by using the functions of these two systems.
For this reason, the chapters on System Lane Assist and ACC are to be read
carefully and the safety notes are to be observed.
Operating conditions
Read and observe
on page 245 first.
The system activation occurs automatically whilst fulfilling the following ba-sic conditions.
Lane Assist with the adaptive tracking is enabled, the boundary lines on
both sides are recognized lane » page 243.
ACC is activated and the regulation » page 233 follows.
The vehicle speed is below 65 km/h.
245Assist systems