Assist systems
Braking and stabilisation systems
Introduction
This chapter contains information on the following subjects:
Electronic Stability Control (ESC)
138
Antilock Braking System (ABS)
138
Traction Control System (TCS)
139
Electronic Differential Lock (EDL and XDS)
139
Driver Steering Recommendation (DSR)
139
Hydraulic Brake Assist (HBA)
140
Hill Hold Control (HHC)
140
Multi-collision brake (MCB)
140
Trailer stabilisation (TSA)
140
This chapter deals with the functions of the braking and stabilisation systems,
with the error indicator referred to in chapter » page 34, Warning lights .
The braking and stabilisation systems are automatically activated each time
the ignition is switched on.
WARNING■ A lack of fuel can cause irregular engine running or cause the engine to
shut down. The brake assist systems would then fail to function – risk of
accident!■
The increased safety provided by the brake assist systems must not
tempt you to take safety risks – risk of accident!
■
Always adjust your speed and driving style to the current visibility, weath-
er, road and traffic conditions.
Electronic Stability Control (ESC)
Read and observe
on page 138 first.
The ESC improves vehicle stability in dynamic driving situations, such as when
the vehicle starts to skid.
The ESC monitors whether the desired direction of the current vehicle motion
is occurring. In case of any deviation (e.g. oversteer), the ESC automatically
brakes individual wheels to maintain the desired direction.
During an intervention of the system, the warning light flashes in the instru-
ment cluster.
Enable/disable ESC Sport
ESC Sport allows for sportier driving style. The activation of the ESC sport
leads to the ASR being deactivated and no ESC interventions will occur in the
event of slight over- or under-steering occurring.
The activation or deactivation of the ESC sports can be done in one of two
ways.
› By pressing the Symbol key
for the activation and briefly pressing the but-
ton for the deactivation » Fig. 137 on page 139 .
› In Infotainment
» Operating instructions for Infotainment , chapter Vehicle
settings (CAR button) .
Upon activation, in the instrument cluster the indicator light comes on and
the display shows the following message.
ESC sport: Limited driving stability.
ESC SPORT
Upon deactivation, in the instrument cluster the control indicator turns off
and the display shows the following message.
Stabilisation control (ESC) activated.
ESC ON
Antilock Braking System (ABS)
Read and observe
on page 138 first.
ABS prevents the wheels locking when braking. Thus helping the driver to
maintain control of the vehicle.
The intervention of the ABS is noticeable from the pulsating movements of
the brake pedal which is accompanied by noises.
When the ABS system is active, do not brake periodically or reduce the pres- sure on the brake pedal.
138Driving
Traction Control System (TCS)Fig. 137
System button: Vehicle with ESC / vehicle without ESC
Read and observe
on page 138 first.
TCS prevents the spinning of the wheels of the driven axle. TCS reduces the
drive power transmitted to the wheels in the case of slipping wheels. Thus, for
example, driving on road surfaces with low grip is made easier.
During a TCS intervention, the indicator light flashes in the instrument clus-
ter.
Activating/deactivating TCS
The activation or deactivation of TCS can be done, depending on equipment, in
one of the following ways.
› In Infotainment
» Operating instructions for Infotainment , chapter Vehicle
settings (CAR button) .
› By briefly pressing the symbol key
» Fig. 137 .
› By briefly pressing the symbol key
» Fig. 137 .
Upon deactivation, in the instrument cluster the indicator light lights up and
the display shows the following message.
Traction control (ASR) deactivated.
ASR OFF
Upon activation, in the instrument cluster the indicator turns and the display
shows the following message.
Traction control (ASR) activated.
ASR ON
The TCS should normally always be enabled. The system should be deactivated
only in the following situations, for example.
› When driving with snow chains.
› When driving in deep snow or on a very loose surface.
› When it is necessary to “rock” a car free when it has become stuck.
Note
On vehicles without the ESC system, the warning light
does not illuminate
upon deactivation of the ASR system, but a message is only displayed on the
display of the instrument cluster.
Electronic Differential Lock (EDL and XDS)
Read and observe
on page 138 first.
EDL
EDL prevents the turning of the respective wheel of the driven axle. EDL
brakes the spinning wheel, if necessary, and transmits the driving force to the
other driving wheel. Driving becomes easier on road surfaces with different
traction under each wheel of the driven axle.
EDL switches off automatically to avoid excessive heat generation on the
brake of the wheel being braked. The vehicle can continue to be driven and
has the same characteristics as a vehicle not fitted with EDL. Once the brakes
have cooled down, there is an automatic re-activation of EDL.
XDS
XDL is an extension to the electronic differential lock. XDL does not respond to
traction, but to the load relief of the inner front wheel of the driving axle dur-
ing fast cornering.
The automatic brake intervention on the brake of the wheel with reduced load
prevents the wheel from spinning. Thus, the traction is improved and the vehi-
cle can continue to follow the desired track.
Driver Steering Recommendation (DSR)
Read and observe
on page 138 first.
The DSR indicates to the driver in critical situations a steering recommenda-
tion in order to stabilise the vehicle. The DSR is activated, for example, on the
right and left vehicle side when braking sharply on different road surfaces.
139Assist systems
WARNING■The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Moving persons or objects may not be recognized by the system sensors.
■
Under certain circumstances, surfaces of certain objects and types of
clothing cannot reflect the system signals. For this reason, such people or
objects may not be recognised by the system sensors.
■
External noise sources may affect the signals of the system sensors. Un-
der adverse conditions, this may cause objects or people not to be recog-
nised by the system.
■
You should satisfy yourself before reversing that there is no small obsta-
cle, such as a rock, thin post, trailer drawbar etc., in front or behind your ve-
hicle. Such obstacles may not be recognised by the system sensors.
CAUTION
■ Keep the system sensors » Fig. 139 on page 141 clean, and free from snow
and ice, and do not cover with any objects of any kind, otherwise the system
functioning may be limited.■
Under adverse weather conditions (heavy rain, water vapour, very low or
high temperatures etc.), the system functioning may be limited - “incorrect ob-
stacle detection”.
■
Additionally installed accessories such as bicycle carriers can impair the sys-
tem functioning.
Function
Fig. 138
Sampled areas and range of the sensors / system button (Ver-
sion 2, 3)
Fig. 139
Fitting the ultrasonic sensors: front/rear
Read and observe
and on page 141 first.
Depending on the equipment, the following system versions can ex-
ist » Fig. 138 .
› Version 1: warns of obstacles in the areas
C
,
D
.
› Version 2: warns of obstacles in the areas
A
,
B
,
C
,
D
.
› Version 3: warns of obstacles in the areas
A
,
B
,
C
,
D
,
E
.
Approximate range of sensors (in cm)
Area » Fig. 138Version 1
(4 sensors)Version 2
(8 sensors)Version 3
(12 sensors)A-120120B-6090C160160160D606090E--90
Acoustic signals and display
The interval between the acoustic signals becomes shorter as the clearance is
reduced. A continuous tone sounds from a distance of approx. 30 cm - danger
area. From this moment on do not continue driving!
For information on setting the acoustic signals and a description of the Info-
tainment display, see » Infotainment manual , chapter Vehicle settings (button
CAR) .
141Assist systems
Towing a trailer
On vehicles equipped with a factory-fitted towing device, only the areas A
and
B
» Fig. 138 of the system are active when operating a trailer, there is no
road display.
Note
■ If not all fields around vehicles with Version 3 are shown after the system is
activated, the vehicle will need to be moved a few metres forwards or back-
wards.■
The signal tones for front obstacle recognition are factory-set to be higher
than for rear obstacle recognition.
Activation/deactivation
Read and observe
and on page 141 first.
The system is automatically activated by selecting reverse gear or pressing
the symbol button
» Fig. 138 on page 141 .
This is confirmed by a short acoustic signal (the symbol in the button lights
up).
On vehicles with Version 1, the system can be deactivated by moving out of re-
verse gear.
For vehicles with Version 2 and 3, the system is deactivated by pressing the
symbol button or automatically at a speed over 10 km/h (the symbol
in
the button goes out).
Fault display
If a warning signal sounds for about 3 seconds after activating the system and
there is no obstacle close to your car, this indicates a system fault. The fault is
also indicated by the symbol flashing in the button. Seek help from a spe-
cialist garage.
Note
■ The system can only be activated via the symbol button at a speed of be-
low 10 km/hr.■
By means of the key
in the infotainment display » Fig. 140 on page 142
the display can be switched to the camera image » page 143, Optical Parking
Assistant (rear view camera) .
Road displayFig. 140
Infotainment display: Road dis-
play
Read and observe and on page 141 first.
The display of the upcoming road changes depending on the steering angle
A
» Fig. 140 .
Obstacles that are located on the road are represented by the following col-
ours.
› Red – the distance to the obstacle is less than about 30 cm.
› Yellow – the distance to the obstacle is more than about 30 cm.
Obstacles that are not located on the road are represented by the following
colours.
› Red – the distance to the obstacle is less than about 30 cm.
› White – the distance to the obstacle is more than about 30 cm.
The road ahead is displayed when a forward gear or Neutral is engaged or the
selector lever is in mode D/S or position N is set.
The road behind the vehicle is displayed when reverse gear is engaged or the
selector lever is in mode R.
142Driving
Automatic system activation when moving forwardFig. 141
Infotainment display: Display
with automatic activation
Read and observe and on page 141 first.
Automatic activation takes place at a speed below around 10 km/h under the following conditions.
› The distance to the obstacle at the front is less than around 90 cm.
› The distance to the obstacle at the front is less than around 30 cm.
› The distance to the obstacle to the side of the vehicle is less than around
30 cm.
After activation, the following is shown in the left pane of the Infotainment
display » Fig. 141 .
Acoustic signals are sounded as of a distance from the obstacle of around
50 cm.
Automatic display can be activated/deactivated in the Infotainment » Infotain-
ment manual , chapter Vehicle settings (CAR button) .
Optical Parking Assistant (rear view camera)
Introduction
This chapter contains information on the following subjects:
Operation
143
Orientation lines and function keys
144
Optical Parking assistant (hereinafter only as a system) displays in Infotain-
ment the area to the rear of the vehicle monitored by the camera » Fig. 142 on
page 143 .
WARNING■
The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Make sure that the camera lens is not dirty or covered, otherwise the sys-
tem function can be significantly impaired. Information on clean-
ing » page 184 , Camera lens
CAUTION
■
The camera lens distorts and enlarges the field of view of the difference in
eye sight. The display is therefore only of limited use for estimating distances
to following vehicles.■
Some items, such as thin columns, chain link fences or lattice may not be
represented adequately in terms of display resolution.
■
It is only a two-dimensional display. Therefore, protruding objects or roadway
depressions, for example, may not be recognised due to lack of space depth.
■
In a crash or damage the vehicle's rear camera can possibly deviate from the
correct position. If this is the case, have the sensor checked by a specialist ga-
rage.
Operation
Fig. 142
Position of the camera / Monitored area
Read and observe
and on page 143 first.
Monitored area » Fig. 142
Detection range of the camera.
Area outside the detection range of the camera.
AB143Assist systems
The state in which the steering wheel is operated by the system, is referred to
as parking operation.
The parking aid is part of the park assist system, therefore the information
and safety guidelines » page 140 , Parking aid must also be read and ob-
served.WARNING■ The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
During the parking process, the system automatically performs rapid
steering movements. While it is doing so, do not place your hands between
the steering wheel – risk of injury!
■
During a parking manoeuvre on loose or slippery surfaces (gravel, snow,
ice, etc.) you may stray from the calculated road because of the surface
conditions. Therefore we suggest that you do not use the system in such
situations.
■
External noise sources may affect the signals of the system sensors. Un-
der adverse conditions, this may cause objects or people to not be recog-
nised by the system.
CAUTION
■ If other vehicles are parked behind the kerb or on it, the system can also
guide your vehicle beyond the kerb or onto it. Ensure that the wheels or the
wheel rims of your vehicle are not damaged and if necessary intervene in time.■
Under certain circumstances, surfaces or structures of certain objects such
as wire mesh fences or powder snow cannot be recognised by the system.
■
Under adverse weather conditions (heavy rain, water vapour, very low or
high temperatures etc.), the system functioning may be limited - “incorrect ob-
stacle detection”.
CAUTION
The correct evaluation of the parking space and the parking procedure de-
pends on the circumference of the wheels on the vehicle.■
The system only works correctly if the vehicle is fitted with the wheel size
approved by the manufacturer.
■
Do without the use of the system if snow chains or a spare wheel is moun-
ted.
■
If wheels other than those approved by the manufacturer are mounted, the
resulting position of the vehicle in the parking space can differ slightly. This
can be avoided by readjusting the system at a specialist garage.
NoteWe recommend performing the parking at a safe speed to about 5 km / h.
Functioning
Read and observe
and on page 145 first.
Basic system operations
› The measurement and evaluation of the size of parking spaces when driving.
› The determination of the correct position of the vehicle for parking.
› The calculation of the line on which the vehicle drives backwards into the
parking space or forwards from the parking space.
› Automatic rotation of the front wheels during the parking.
The display of the instrument cluster (hereinafter only in the display) informa- tion and system messages are displayed.
When the system is activated, the warning light lights up
» Fig. 144 on
page 145 -
.
The traction control system (TCS) must always be switched on when parking.
Finding a parking space
Fig. 144
System button / display
Read and observe
and on page 145 first.
Finding a parallel parking space
›
Drive past the parking space at up to 40 km/h and a distance of 0.5 – 1.5 m.
›
Press the symbol button once
» Fig. 144 .
The display shows » Fig. 144 -
.
145Assist systems
Automatic termination
The system terminates the parking procedure if one of the following cases ari-
ses.
› A speed of 7 km / h is exceeded for the second time.
› The time limit of 6 minutes is exceeded.
› The system key is pressed.
› The ASR system is turned off.
› There is a driver intervention in the automatic steering operation (wheel
stop).
› When there is a system fault (system temporarily not available).
› There is an automatic emergency braking.
If any of the above events occur, the following warning message is dis-
played » page 147 .
Departing from a parallel parking space
Read and observe
and on page 145 first.
Manoeuvring out
›
Press the symbol button once
» Fig. 144 on page 145 .
›
Activate the turn signal for side of the vehicle where the parking space is out
of which you wish to manoeuvre.
›
Select reverse gear or move the selector lever into position R.
›
As soon as the following message is shown in the display: Steer. interv. ac-
tive Check area around veh.! , let go of the steering wheel. The steering will
be taken over by the system.
›
Observe the direct vicinity of the vehicle and reverse carefully.
›
Follow the system instructions shown in the display.
As soon as the parking procedure is completed, an audible signal sounds and
the following message appears in the information display:
Please take over steering and drive on.
Automatic termination
The system terminates the manoeuvring procedure if one of the following ca-
ses arises.
› The system key is pressed.
› The ASR system is turned off.
› There is a driver intervention in the automatic steering operation (wheel
stop).
› When there is a system fault (system temporarily not available).
› There is an automatic emergency braking.
If any of the above events occur, the following warning message is dis-
played » page 147 .
Automatic emergency braking
Read and observe
and on page 145 first.
If the system detects a risk of collision during parking, automatic emergencybraking takes place to prevent a collision.
The parking is terminated by the emergency braking.
CAUTION
If the parking is aborted due to the speed exceeding 7 km / h for the second
speed, then the automatic emergency braking is not triggered by the system!
Information messages
Read and observe
and on page 145 first.
The information messages are shown in the instrument cluster display. Park Assist stopped. Speed too high.
If a speed of 50 km / h is exceeded while searching for a parking space, the
system with the key symbol is must be reactivated.
Speed too high. Take over steering!
The parking is terminated if the speed exceeds 7 km / hr. Park Assist stopped. Driver steer. intervent.
The parking procedure is terminated due to a driver steering intervention. Park Assist stopped. ASR deactivated.
The parking procedure cannot be carried out because the TCS system is deac-
tivated. Activate the TCS.
ASR deactivated. Take over steering!
The parking procedure was ended because TCS was deactivated during the parking procedure.
Trailer: Park Assist stopped.
The parking procedure cannot be carried out because a trailer is hitched. Time limit exceeded. Take over steering!
147Assist systems
The parking procedure was ended because the time limit of 6 minutes was
passed.
Park Assist currently not available.
The system cannot be activated because a fault exists on the vehicle. Seek
help from a specialist garage.
Park Assist stopped. Not available.
The parking procedure was ended because a fault exists on the vehicle. Seek
help from a specialist garage.
Park Assist faulty. Workshop!
The parking procedure is not possible because a fault exists in the system.
Seek help from a specialist garage.
ASR intervention. Take over steering!
The parking procedure is terminated by a TCS intervention. Park Assist: indicate and engage reverse
The prerequisites for manoeuvring out of a parking space using the system
have been met. Switch on the turn signals and shift into reverse.
Aut. parking space exit not possible. Space too small.
The manoeuvring procedure using the system is not possible. The parking gap
is too small.
Braking intervention. Speed too high.
The speed was too high during the parking and was automatically reduced.
Cruise Control System
Introduction
This chapter contains information on the following subjects:
Functioning
148
Operating Description
149
The Cruise Control System (CCS) maintains a set speed without you having to
actuate the accelerator pedal.
The state where the GRA maintains the speed is referred to hereinafter as the
control .
WARNING■
The GRA only serves to support and does not relieve the driver of the re-
sponsibility for the vehicle operation.■
Always adjust the speed and driving style to the current visibility, weath-
er, road and traffic conditions.
■
After pressing the clutch pedal, no interrupted control occurs! For exam-
ple, if a different gear is engaged and the clutch pedal is released, control is
continued.
Functioning
Fig. 146
Instrument cluster display: Examples of status displays the CCS
Read and observe
on page 148 first.
CCS status indications » Fig. 146
Speed set, control inactive (the number of speed indications are small and
grey in colour).
Control is active (the numbers of speed indications are shown large or are
highlighted).
No speed set.
System fault - seek assistance from a specialist garage immediately.
Basic requirements for start of control The GRA is activated.
On vehicles with manual transmission , second gear or higher is engaged.
On vehicles with 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.
148Driving