Page 105 of 184

The Front Assist (hereinafter referred to as system) warns you of the danger 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 » Fig. 123 on
page 103 .WARNING■
The general information relating to the use of assistance systems must
be observed » page 93, 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.
Radar sensor
Fig. 123
Installation location of the radar
sensor
Read and observe and on page 103 first.
The radar sensor » Fig. 123(hereinafter referred to as the sensor) may detect
objects by radiating and receiving electromagnetic waves.
The sensor function may be impaired in the events of one of the following. ▶ The sensor cover is soiled (e.g. with mud, snow and the like).
▶ The area in front of and around the sensor cover is obscured (e.g. by labels,
auxiliary headlights and the like).
▶ When 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 105, Malfunctions .
WARNING■
If you suspect that the sensor is damaged, deactivate the system. Have
the sensor checked by a specialist garage.■
A collision or damage in the front or lower area of the vehicle could affect
the sensor function - there is risk of accident! Have the sensor checked by
a specialist garage.
■
Do not cover the area in front of and around the sensor cover. 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
Read and observe
and on page 103 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 94.
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 94.103Assist systems
Page 106 of 184

Distance warningFig. 124
Instrument cluster display: Distance warning
Read and observe and on page 103 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
» Fig. 124 appears in the display.
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. 125
Instrument cluster display: Warning or emergency
braking at low speed
Read and observe and on page 103 first.
Emergency braking at low speed
If there is a risk of collision in a vehicle speed range of about 5 km/h to 30 km/h, the system triggers an automatic braking.
With automatic braking, the warning light
» Fig. 125 appears in the display.
Advance warning
If the system detects a risk of collision, the warning light » Fig. 125 appears
in the display and you will hear an acoustic signal.
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 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.104Driving
Page 107 of 184

Deactivation/activationFig. 126
Keys / dial: on the operating lever / on the multifunction steering
wheel
Read and observe
and on page 103 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 42, Menu item
Assist systems
.
Deactivation / activation in vehicles with segment display
Button
» Fig. 126ActionOperationAHold up / downShow Front Assist menu itemBPressDeactivate/activate system
Deactivation / activation in vehicles with multi-function steering wheel
Button / dial
» Fig. 126ActionOperation
CPressShow Front Assist menu itemDPressDeactivate/activate system
Disable / enable and setting in the Infotainment
In Infotainment, the entire system or the functions warning and distance
warning can be deactivated/activated » Owner´s Manual - Infotainment .
If the distance-warning function was deactivated before switching off the igni-
tion, it remains deactivated after switching on the ignition.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 vehicle ferry service or similar.
Malfunctions
Read and observe
and on page 103 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 is dirty or covered, a message indicating that there is no sensor
view appears. Clean the sensor cover or remove the obstacles » Fig. 123 on
page 103 .
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.
Fatigue detection
The fatigue detection system (hereinafter referred to as system) recommends
the driver takes a break from driving when driver fatigue can be detected due
to the driver's steering behaviour.
From the starting of the journey, the system evaluates the steering behaviour
at speeds 65-200 km/h. If, while driving, there have been changes in the steer-
ing behaviours that are evaluated by the system as indicating possible fatigue,
a break recommendation is issued.
Conditions under which a break from driving is detected by the system ▶ The vehicle is stopped and the ignition switched off.
▶ The vehicle is stopped, the seat belt removed and the driver's door opened.
▶ The vehicle is stopped for more than 15 minutes.
105Assist systems
Page 108 of 184

If none of these conditions are met or if the driving style is not changed, the
system recommends a driving break again after 15 minutes.
The system can be activated/deactivated in the Infotainment » Owner´s Man-
ual - Infotainment .
Pause recommendation
The icon appears and the following message for a few seconds in the display
of the instrument cluster and a message about the detected fatigue. An au-
dible signal is also emitted.WARNING■ The general information relating to the use of assistance systems must
be observed » page 93, in section Introduction .■
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.
Tyre pressure monitoring
Introduction
This chapter contains information on the following subjects:
Storing the tyre pressure values.
106
Storing the tyre pressure values and Infotainment display
107
Storing the tyre pressure values by means of the key
107
The tyre pressure monitoring function (hereinafter referred to as the system)
monitors the tyre pressure while driving.
If the tyre inflation pressure changes, the warning light
lights up in the in-
strument cluster and an audible signal is heard » page 33,
Tyre pressure .
The system can only function properly if the tyres have the prescribed inflation
pressure and this pressure values are stored in the system.
WARNING■ The general information relating to the use of assistance systems must
be observed » page 93, in section Introduction .■
Having the correct tyre inflation pressure is always the driver's responsi-
bility. Tyre pressure should be checked regularly » page 134.
■
The system cannot warn in case of very rapid tyre inflation pressure loss,
e.g. in case of sudden tyre damage.
Storing the tyre pressure values.
Read and observe
on page 106 first.
The tyre pressure values are always stored in the system, if one of the fol-
lowing events occurs. ▶ Change of tyre inflation pressure.
▶ Change one or more wheels.
▶ Change in position of a wheel on the vehicle.
▶ The warning light in the instrument cluster.
The storage of the tyre pressure values depends on equipment, either in the
infotainment or by pressing a button.
WARNINGBefore storing the pressures, the tyres must be inflated to the specified in-
flation pressure » page 134. When storing incorrect pressure values, the
system could possibly not issue any warnings, even with a too low tyre
pressure.
CAUTION
The tyre pressure values are to be saved every 10,000 km or once annually to
ensure correct system functioning.106Driving
Page 109 of 184

Storing the tyre pressure values and Infotainment displayFig. 127
Button for storing the pressure
values / display example: the
system shows a front right tyre
pressure change
Read and observe on page 106 first.
›
Inflate all the tyres to the specified pressure.
›
Turn on the ignition and switch on Infotainment.
›
Press the button in Infotainment and then tap on the
Tap
→
Vehiclestatus
.
›
Use the function surfaces
Select the menu item
Tyre Pressure Loss Indi-
cator .
›
Tap on the function
Tap on
» Fig. 127 .
In addition, follow the instructions that appear on the display.
A message in the display informs about the storage of the tyre pressure val-
ues.
Note
When a warning light in the instrument cluster appears, the affected tyre
can be displayed on the infotainment » Fig. 127.
Storing the tyre pressure values by means of the key
Fig. 128
Key for storing the pressure val-
ues
Read and observe on page 106 first.›
Inflate all the tyres to the specified pressure.
›
Switch on the ignition.
›
Press the symbol button
» Fig. 128 on the button.
The warning light
in the instrument cluster illuminates.
An acoustic signal and the control indicator provide information about the
storage of the tyre pressure values.
›
Release the symbol key
.
107Assist systems
Page 110 of 184

Towing device and trailer
Hitch
Introduction
This chapter contains information on the following subjects:
Description
108
Adjusting the ready position
109
Check the setting of the standby position
109
Assembling the bar ball - Step 1
110
Assembling the bar ball - Step 2
110
Check proper fitting
111
Removing the bar ball - Step 1.
111
Removing the bar ball - Step 2.
111
Vertical load with mounted accessories
112
The maximum trailer nose weight when towing a trailer is 50 kg. Other infor-
mation (e.g. on the nameplate of the towing device) provide information only
about the test values of the device.
WARNING■ Check that the tow bar is seated correctly and is secured in the mounting
recess before the start of every journey.■
When the ball rod is not properly secured in the receiving shaft, it could
be damaged or incomplete, and should not be used - there is a risk of acci-
dent.
■
Do not modify or adapt the towing device in any way.
■
Keep the mounting recess of the towing equipment clean at all times.
Such dirt prevents the ball head from being attached securely.
DescriptionFig. 129
Carrier for the towing device/tow bar
Read and observe
on page 108 first.
The ball rod is detachable and is located in the stowage compartment for the
spare / emergency wheel.
Support for the towing device and tow bar » Fig. 129
Cap
Mounting recess
Protective cap
locking ball
Centering
Handwheel
Key
Lock cap
Red marking on the handwheel
Tow bar
Green marking on the handwheel
White marking on tow bar
123456789101112108Driving
Page 111 of 184

Adjusting the ready positionFig. 130
Remove cap from the lock / insert key into the lock
Fig. 131
Setting the ready position
Read and observe
on page 108 first.
The tow bar must be set prior to installation to the standby position
» page 109 , Check the setting of the standby position .
›
Grip the tow bar below the protective cap.
›
Remove the cover
A
from the lock in the direction of the arrow
1
» Fig. 130 .
›
Insert the key into the lock
B
in the direction of arrow
2,
so that the arrow
on the key symbol
shows.
›
Turn the key
B
to the stop in the direction of arrow
3,
so that the arrow on
the key points to the
» Fig. 131 symbol.
›
Pull the hand wheel
C
in the direction of the arrow
4
and turn in the direc-
tion of the arrow
5
to the stop. The hand wheel
C
remains locked in this
position.
Check the setting of the standby positionFig. 132
Ready position
Read and observe
on page 108 first.
Correctly adjusted standby position » Fig. 132
The key
A
is in the unlocked position - the arrow on the key points to the
symbol .
The locking ball
B
can be pushed fully into the tow bar.
The red marking
C
on the hand wheel points to the white marking on the
ball bar.
There is a clear gap of approx. 4 mm
D
between the hand wheel and the
tow bar.
When in the ready position, the key cannot be removed from the lock. The ball
bar is thus set ready for installation.
109Towing device and trailer
Page 112 of 184

Assembling the bar ball - Step 1Fig. 133
Remove cap for receiving shaft / use ball bar
Read and observe
on page 108 first.
The tow bar must be set to the standby position » page 109, Check the setting
of the standby position . If this is not in the standby position, then it must be
set to the standby position » page 109, Adjusting the ready position .
›
To prepare for the installation , remove the cap for the receiving shaft
A
in
direction of arrow
1
» Fig. 133 .
›
To install , hold the ball rod from underneath » Fig. 133 .
›
Push the ball rod into the receiving shaft in the direction of arrow
2
until it
stops. The ball rod must audibly snap into place » .
The hand wheel
B
rotates back automatically and rests on the ball rod » .
WARNINGDo not hold the handwheel with your hand when attaching the ball bar -
there is a risk of finger injury.Assembling the bar ball - Step 2Fig. 134
Secure the lock and remove key / place cap on lock
Read and observe
on page 108 first.
›
To begin with, follow the first step for the ball rod assembly » page 110.
›
Turn the key
A
in the direction of arrow
1,
so that the arrow on the key
symbol » Fig. 134
shows.
›
Remove the key in the direction of the arrow
2
.
›
Fit the cap
B
on the lock in the direction of the arrow
3
.
›
Check that the ball rod is securely attached » page 111.
WARNINGAfter fitting the tow bar, always secure the lock and remove the key. The
tow bar must not be operated with the key inserted.110Driving