Page 169 of 276

Changing the speed by adopting the current speed () - requirements
The ACC is activated.
The vehicle is moving at a speed other than that which is stored.
Note
■
If during control the speed is increased by pressing the accelerator, control is
temporarily stopped. Upon releasing the accelerator, control is automatically
resumed.■
If during control the speed is reduced by applying the brake, control is stop-
ped. Control needs to be restarted in order to resume » page 166.
■
If the vehicle is controlled by a lower speed than the stored speed, then
the current speed is stored the first time the key is pressed. Press the key
again
and the speed is reduced in increments of 1 km/h.
Set the clearance level
Read and observe
on page 163 first.
The proximity to the vehicle ahead can be set with the lever » Fig. 204 on
page 165 or in the Infotainment » Owner´s Manual Infotainment , chapter CAR -
Vehicle settings .
Setting by means of the lever
›
Set the switch to the spring-loaded position or to -
» Fig. 204 on
page 165 .
The display of the instrument cluster shows line
2
» Fig. 202 on page 164 ,
which indicates the proximity.
›
Using the switch set line
2
on the lever to the desired distance level.
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 conditionsFig. 205
Special conditions: Cornering / narrow vehicles or vehicles trav-
elling side by side
Fig. 206
Special conditions: Lane changes of other vehicles / stationary
vehicles
Read and observe
on page 163 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. 205 -
. 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. 204 on page 165 .
167Assist systems
Page 170 of 276

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. 205 -
.
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. 206 -
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 vehicle,
» Fig. 206 -
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. 204 on page 165 .
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.
Towing a trailer
When towing, or in when another accessory is connected to the trailer socket
the ACC control is set with a lower rate. The manner of driving should there-
fore be adapted to this limitation.Information messages
Read and observe
on page 163 first.
The warning symbols are shown in the instrument cluster display.
ACC: no sensor view!
The sensor cover or the sensor is covered or dirty.
Stop the car, switch off the engine and clean the sensor cover or remove the
obstacle » Fig. 174 on page 143 .
If this message appears in winter, the cause can be snow covering the sensor.
The ACC is functional again after the snow melts away from the sensor.
If the message appears again after starting the engine, the position of the lev- er should be
» Fig. 204 on page 165 adjusted.
ACC not available.
The ACC is not available for an unknown reason.
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 / press. Seek help from a specialist garage.
Speed limit
Increase the speed accordingly and start control
» page 166.
Front Assist
Introduction
This chapter contains information on the following subjects:
Operation
169
Distance warning (dangerous distance)
169
Warning and automatic braking
169
Disable/enable
170
Information messages
171
168Driving
Page 171 of 276

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 143.WARNING■
Please take note of the general points relating to the use of assistance
systems » page 142, 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.
Operation
Read and observe
and on page 169 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, an automatic braking ac-
tion is performed.
The system can work only if the following basic conditions are met. The system is activated.
The TCS is activated » page 143, Braking and stabilisation systems .
The vehicle is moving 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 144.Distance warning (dangerous distance)Fig. 207
Symbols in the instrument cluster: Note (dangerous
proximity)
Read and observe and on page 169 first.
The display of the distance warning is for vehicles with MAXI DOT display.
If a safe interval to the vehicle ahead falls below a minimum the display of the
instrument cluster shows the symbol
» Fig. 207 .
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. 208
Symbols in the instrument cluster: Warning or emer-
gency braking at low speed
Read and observe and on page 169 first.
Emergency braking at low speed
In a driving speed range of about 5 km/h to about 30 km/h the automatic brak- ing action is not preceded by a warning. With an immediate impact hazard au-
tomatic braking is done with the breaking force increasing in stages.
169Assist systems
Page 172 of 276

With automatic braking the symbol appears » Fig. 208 in the display.
Advance warning
If the system detects a risk of collision, the symbol
» Fig. 208 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.
The pre-warning display can occur in the following situations.
▶ If there is a risk of collision with a moving obstacle in a driving speed range of
about 30 km/h to about 210 km/h.
▶ There is a risk of a collision with a stationary moving obstacle in a vehicle
speed range of approximately 30 km/h to about 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, 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 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.
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 steering intervention.
Disable/enableFig. 209
Buttons/dial: on the control lever / multifunction steering wheel
Read and observe
and on page 169 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 in menu item
Assist systems
» page 45 .
Deactivation / activation in vehicles with segment display
Button
» Fig. 209ActionOperationAPress and hold at the top or press downShow Front Assist menu itemBPress brieflyConfirm entry (disable / enable)
Deactivation / activation in vehicles with multi-function steering wheel
Button /dial
» Fig. 209ActionOperation
CPress brieflyShow Front Assist menu itemDPress brieflyConfirm entry (disable / enable)
Disable / enable and setting in the Infotainment
In the Infotainment the entire system or the functions warning and distance warning can be disabled / enabled » Owner´s Manual Infotainment , chap-
ter CAR - Vehicle Settings .
170Driving
Page 173 of 276

f the distance-warning function was deactivated before the ignition was
switched off, it remains deactivated after the ignition is switched on again.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.
Information messages
Read and observe
and on page 169 first.
The warning symbols are shown in the instrument cluster display.
Front Assist: no sensor view.FRONT ASSIST NO SENSOR VIEW
The sensor cover or the sensor is covered or dirty.
Stop the car, switch off the engine and clean the sensor cover or remove the
obstacle » Fig. 174 on page 143 .
If this message appears in winter, the cause can be snow covering the sensor.
The system is functional again after the snow melts away from the sensor.
Front Assist not available.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 after engine start the message persists, then the help of a professional or- ganisation is required.
Selection of the driving mode(Driving Mode Selection)
Introduction
This chapter contains information on the following subjects:
Adaptive Chassis Control (DCC)
171
Mode
Comfort171Normal172Sport
mode172Eco
mode
172Individual
mode
172
Mode selection and Infotainment display
173
Mode settings
Individual173
By selecting the driving mode, the driving behaviour can be adapted to the de-
sired mode of operation.
The following modes are available
Comfort
,
Normal
,
Sport
,
Eco
and
Individual
.
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 142, in section Introduction .
Note
The set driving mode remains stored even after switching the ignition on and
off.
Adaptive Chassis Control (DCC)
Read and observe
on page 171 first.
The adaptive chassis control (following known as DCC) provides the ability toadjust 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
Comfort
Read and observe on page 171 first.
This mode is suitable for driving on roads with poorer surface or for long mo- torway journeys.
171Assist systems
Page 174 of 276

Normal
Read and observe on page 171 first.
This mode is suitable for a conventional driving.
Sport
mode
Read and observe
on page 171 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 .
Engine / 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 163 .
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 173.
Eco
mode
Read and observe
on page 171 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.
Engine / drive
Vehicle acceleration is more relaxed than in
Normal
mode.
The recommended gear is controlled such to achieve the lowest possible fuel
consumption » page 42.
When the START-STOP system was deactivated manually » page 130, it is au-
tomatically activated.
The automatic gearbox is set automatically to mode E » page 135 .
Adaptive Cruise Control (ACC)
Acceleration occurs more relaxed than in Normal
» page 163 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
■ The mode Eco is not available when towing a trailer or when another acces-
sory is connected to the trailer socket. If the vehicle is in drive mode Eco
and a
trailer is hitched up or another accessory is connected, the vehicle is automati-
cally set to the driving mode
Normal
.
■
The maximum vehicle acceleration (kick down function) is possible also in
driving mode
Eco
.
Individual
mode
Read and observe
on page 171 first.
In the mode
Individual
each system can be set independently » page 173, Mode
settings
Individual
.
172Driving
Page 175 of 276

Mode selection and Infotainment displayFig. 210
Button for selecting the driving mode / Display in Infotainment
display
Read and observe
on page 171 first.
Procedure for the selection of the driving mode
›
Press the symbol key
» Fig. 210 .
In the Infotainment display a running mode menu » Fig. 210 appears.
The mode is changed by repeatedly pressing the symbol key or by pressing
the corresponding function key in the Infotainment display.
If a driving mode other than
Normal
is selected, then the symbol illuminates
on the button.
Function buttons on the display » Fig. 210
Sets the mode
Individual
and information on the setting of the currently se-
lected mode.
Cancel the menu to select driving mode.
Modes (for the selected mode the button 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 .■
If the driving mode menu is not operated within a few seconds, the Infotain-
ment switches to the last selected menu or switches off.
ABCMode settingsIndividual
Read and observe on page 171 first.
In mode
Individual
the vehicle systems can be set as follows.
■
DCC:
- Set the shock characteristics
■
Comfort
- Comfortable
■
Normal
- Normal
■
Sport
- Sports
■
Steering:
- Set the power steering characteristics
■
Normal
- Normal
■
Sport
- Sports
■
Engine:
/
Drive:
- Sets the engine characteristic (vehicles with manual transmis-
sion) / drive characteristic (vehicles with automatic transmission)
■
Normal
- Normal
■
Sport
- Sports
■
Eco
- Economical
■
ACC:
- Set the vehicle acceleration when adaptive cruise control is activated
■
Normal
- Normal
■
Sport
- Sports
■
Eco
- Economical
■
Dynamic cornering light:
- Set the characteristics of the xenon headlights
■
Normal
- Normal
■
Sport
- Sports
■
Eco
- Economical
■
Air conditioning:
- Set the Climatronic characteristics
■
Normal
- Normal
■
Eco
- Economical
■
Reset mode
- Setting for all menu items in the
Individual
mode to
Normal
■
Cancel
- Keep the current settings
■
Reset
- Set all menu items to
Normal
Proactive passenger protection (Crew Protect Assist)
Introduction
This chapter contains information on the following subjects:
Function
174
173Assist systems
Page 176 of 276

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 142, in section Introduction .
Note
The system component service life is monitored electronically. Further infor-
mation » page 35 , Safety systems .
Function
Read and observe
on page 174 first.
In critical driving situations (e.g. during emergency braking or a sudden change
in 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.
▶ The windows in the side doors (if open) are automatically closed 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.
The first protection level can be deactivated in one of the following ways.
▶ The system deactivation in the Infotainment » Owner´s Manual Infotain-
ment , chapter CAR - vehicle settings .
▶ Deactivation of TCS » page 143, Braking and stabilisation systems .
▶ Selecting the driving mode
Sport
» page 171 .
Provided that the driving mode
Sport
is not selected, the system is activated
over the two levels of protection after switching the ignition off and on again.
The second level of protection
The system intervenes only if the situation is evaluated as critical, such as in
panic braking at high speeds.
This level of protection cannot be deactivated.
Vehicles with the Front Assist system
On vehicles with Front Assist the system has been expanded to include infor-
mation from the radar sensor » page 143. Using this information a system in-
tervention may also occur when there is the danger of a collision with an ob-
stacle detected in front of the vehicle.
A system intervention can only take place on the basis of the information col-
lected by the radar sensor, if the radar sensor is fully functional.
Note
If the front passenger front airbag is deactivated » page 19 the belt tensioning
function for the front passenger seat is switched off.
Lane Departure Warning (Lane Assist)
Introduction
Fig. 211
Camera viewing window for Lane
Assist
This chapter contains information on the following subjects:
Operation
175
Activation / deactivation
176
Information messages
176
The lane departure warning (following known as system) helps to keep the ve-
hicle between the boundary lines of a lane.
The system detects the boundary lines of a lane using the camera » Fig. 211.
174Driving