Page 113 of 204

Fig. 121
Segment display: Examples of status displays the CCS
Read and observe
on page 110 first.
CCS status displays » Fig. 120 , » Fig. 121
Speed set, but control is inactive.
Control is active.
No speed set.
System fault - seek assistance from a specialist garage immediately.
Basic requirements for starting the control The CCS is activated.
On vehicles with a manual transmission , the second gear or higher is en-
gaged.
On vehicles with an automatic transmission , the selector lever is in the
D/S position or in the Tiptronic position.
The current speed is higher than approx. 20 km/h.
This is only possible within the range which is permitted by the power output
and braking power of the engine.
WARNINGIf the engine power and engine braking effect is insufficient to maintain
the set speed, vehicle operation must be taken over!Operating DescriptionFig. 122
Cruise control system controls
Read and observe on page 110 first.
Overview of the control elements of the CCS » Fig. 122ADeactivate CCS (delete set speed) Interrupt control (sprung position) Activate CCS (control deactivated)BTake control again a)
/ Increase speedCStart control / reduce speeda)
If no speed is set the current speed is adopted.
At the start of the regulation the CCS regulates the vehicle to the current
speed, and this speed is shown on the instrument cluster display. The warning
light illuminates in the instrument cluster.
Automatic control interruption
Automatic control interruption occurs if any of the following conditions are
met. ▶ The brake pedal is operated.
▶ When one of the brake assist systems (e.g. ESC) intervenes.
▶ Through an airbag deployment.
WARNING■Always deactivate the cruise control system after use to prevent the sys-
tem being switched on unintentionally.■
Control may only be resumed if the set speed is not too high for the cur-
rent traffic conditions.
111Assist systems
Page 114 of 204

NoteDuring control, speed can be increased by pressing the accelerator pedal. Re-
leasing the accelerator pedal will cause the speed to drop again to the set
speed.
Front Assist
Introduction
This chapter contains information on the following subjects:
Radar sensor
112
Operation
113
Distance warning (dangerous distance)
113
Warning and automatic braking
113
Disable/enable
114
Information messages
114
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 112 .
WARNING■
The general information relating to the use of assistance systems must
be observed » page 105, 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 sensorFig. 123
Mounting location of the radar
sensor
Read and observe and on page 112 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 is soiled by mud, snow and the like.
▶ The area in front and around the sensor is obscured by labels, auxiliary lights
and similar.
▶ 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 114, 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 and similar. 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.112Driving
Page 115 of 204

OperationRead and observe
and on page 112 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 106, Traction control (TCS) .
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 106.
Distance warning (dangerous distance)
Fig. 124
Symbols in the instrument cluster: Note (dangerous
proximity)
Read and observe and on page 112 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. 124 .
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
Symbols in the instrument cluster: Warning or emer-
gency braking at low speed
Read and observe and on page 112 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.
With automatic braking the symbol appears » Fig. 125
in the display.
Advance warning
If the system detects a risk of collision, the symbol » Fig. 125
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.
113Assist systems
Page 116 of 204

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/enable
Fig. 126
Buttons/dial: on the operating lever/the multifunction steering
wheel
Read and observe
and on page 112 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 42 .
Deactivation / activation in vehicles with segment displayButton
» Fig. 126ActionOperationAPress and hold at the top or downShow Front Assist menu itemBPress brieflyConfirm entry (disable / enable)
Deactivation / activation in vehicles with multi-function steering wheel
Button /dial
» Fig. 126ActionOperation
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 .
f 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 car ferry service or similar.
Information messages
Read and observe
and on page 112 first.
The warning symbols are shown in the instrument cluster display.
Front Assist: no sensor view.FRONT ASSIST NO SENSOR VIEW
The sensor is soiled or covered.
114Driving
Page 117 of 204

Stop the car, switch off the engine and clean the sensor or eliminate the dis-
turbance causing the lack of visibility » Fig. 123 on page 112 .
If after engine start the message persists, then the help of a professional or-
ganisation is required.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.
Fatigue detection
Introduction
This chapter contains information on the following subjects:
Function
115
Information messages
115
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.
WARNING■ The general information relating to the use of assistance systems must
be observed » page 105, 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.
Function
Read and observe
on page 115 first.
From the start of the journey, the system evaluates steering behaviour. If,
while driving, there have been changes in the steering behaviours that are
evaluated by the system as indicating possible fatigue, a break recommenda-
tion is issued.
The system evaluates steering behaviour and recommends a break at speeds
of 65 - 200 km/h.
The system detects a break from driving when one of the following condi-
tions is met.
▶ 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.
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 or deactivated in the Infotainment » Owner´s
Manual Infotainment , chapter CAR - vehicle settings .
Information messages
Read and observe
on page 115 first.
The icon appears and the following message for a few seconds in the display
of the instrument cluster and the following message.
Driver alert.
Take a break!DRIVER ALERT TAKE A BREAK
An audible signal is also emitted.
Tyre pressure monitoring
Introduction
This chapter contains information on the following subjects:
Save tyre pressure values
116
Save tyre pressure values and infotainment display
116
Save tyre pressure values by pressing a button
117
115Assist systems
Page 118 of 204

The tyre pressure monitoring function (hereinafter referred to as the system)
monitors the tyre pressure while driving.
When changing the tyre inflation pressure, the warning light illuminates
in
the instrument cluster and an audible signal is heard.
Information on the procedure for the notification of change of tyre inflation pressure » page 34 .
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 105, in section Introduction .■
Having the correct tyre inflation pressure is always the driver's responsi-
bility. Tyre pressure should be checked regularly » page 151.
■
The system cannot warn in case of very rapid tyre inflation pressure loss,
e.g. in case of sudden tyre damage.
Save tyre pressure values
Read and observe
on page 116 first.
The tyre pressure values are always stored in the system, if one of the follow-ing 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 151. 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.Save tyre pressure values and infotainment displayFig. 127
Button for storing the pressure
values/example of the display:
the system suggests a change to
the front-left tyre pressure
Read and observe on page 116 first.
›
Inflate all the tyres to the specified pressure.
›
Switch on the ignition.
›
The Infotainment switches on.
›
Press the button in the Infotainment and then in the display the function
keys one after the other , press
Vehicle status
.
›
By using the function keys
select the menu item
Tyre Pressure Loss Indi-
cator .
›
Press the function key
SET
» 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. 127.116Driving
Page 119 of 204

Save tyre pressure values by pressing a buttonFig. 128
Key for storing the pressure val-
ues
Read and observe on page 116 first.
›
Inflate all the tyres to the specified pressure.
›
Switch on the ignition.
›
Press the symbol button
» Fig. 128 and hold it down.
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 Release the symbol key.
Hitch and trailer
Hitch
Introduction
This chapter contains information on the following subjects:
Description
118
Adjusting the ready position
118
A correctly set ready position
119
Assembling the bar ball - Step 1
119
Assembling the bar ball - Step 2
120
Check proper fitting
120
Removing the bar ball - Step 1.
121
Removing the bar ball - Step 2.
121
Mount accessories
122
The maximum trailer draw-bar load is 50 kg.
The draw bar load information on the type plate of the towing device is merely
a test value for the towing device. The vehicle-specific information is detailed
in the vehicle documents.
WARNING■ Check that the tow bar is seated correctly and is secured in the mounting
recess before the start of every journey.■
Do not use the ball head, if it is not correctly inserted into the mounting
recess and secured.
■
Do not use the towing equipment if it is damaged or incomplete.
■
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.
CAUTION
■ Take care with the ball bar - there is a risk of paint damage to the bumper.■When the tow bar is removed always place the cover onto the mounting re-
cess - there is a danger of soiling the mounting recess.
Note
■ Operation and maintenance of hitch » page 133.■Tow the vehicle by means of the detachable ball rod » page 167.117Hitch and trailer
Page 120 of 204

DescriptionFig. 129
Carrier for the towing device/tow bar
Read and observe
and on page 117 first.
The ball head can be removed and is kept in the spare wheel well or in a com-
partment for the spare wheel in the luggage compartment.
Support for the Towing hitch 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
Note
On the bottom of the key is a code number. We advise you to take a not of this
number. If you lose a key, please contact a specialist garage which will be able
to use this code number to provide you with a new one.123456789101112Adjusting the ready positionFig. 130
Remove cap from the lock / insert key into the lock
Fig. 131
Setting the ready position
Read and observe
and on page 117 first.
The tow bar must be set prior to installation to the standby position
» page 119 , A correctly set ready position .
If this is not in the ready position, then this must be set to the standby posi-
tion as follows.
›
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 symbol
» Fig. 131 shows.
›
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.
118Driving