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Assist systems
Brake assist systems
Introduction
This chapter contains information on the following subjects:
Electronic Stability Control (ESC)
150
Antilock Braking System (ABS)
151
Traction Control System (TCS)
151
Electronic Differential Lock (EDL)
151
Driver Steering Recommendation (DSR)
151
Hydraulic Brake Assist (HBA)
151
Hill Hold Control (HHC)
152WARNING■ 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!■
Adjust the speed and driving style to the current visibility, weather, road and
traffic conditions. The increased safety provided by the brake assist systems
must not tempt you to take safety risks – risk of accident!
■
In the event of an ABS fault, visit a specialist garage immediately. Adjust
your style of driving according to the damage to the ABS, as you will not know
the exact extent of the damage or the extent to which this is limiting the
braking efficiency.
CAUTION
■ All four wheels must be fitted with the same tyres approved by the manufactur-
er to ensure the brake assist systems operate correctly.■
Changes to the vehicle (e.g. to the engine, brakes, chassis) can influence the
functionality of the brake assist systems » page 193, Services, modifications, and
technical alterations .
■
If a fault occurs in the ABS system, the ESC, ASR and EDL will also not work. An
ABS fault is indicated by the warning light » page 19 .
Electronic Stability Control (ESC)Fig. 130
ESC system: TCS button
First read and observe the introductory information and safety warn-
ings on page 150.
The ESC system helps improve control of the vehicle in situations where it is be-
ing operated at its dynamic limits, such as a sudden change to the direction of
travel. Depending on the conditions of the road surface, the risk of skidding is re-
duced, thereby improving the vehicle's driving stability .
The ESC system is automatically activated each time the ignition is switched on.The direction which the driver wishes to take is determined based on the steering angle and the speed of the vehicle and is constantly compared with the actualbehaviour of the vehicle. In the event of deviations, such as the car beginning to
skid, the ESC system will automatically brake the appropriate wheel.
During an intervention of the system, the indicator light
flashes in the instru-
ment cluster.
The following systems are integrated into the Electronic Stability Control (ESC).
› Antilock Brake System (ABS)
» page 151.
› Traction control (ASR)
» page 151.
› Electronic Differential Lock (EDL)
» page 151.
› Driver Steering Recommendation (DSR)
» page 151.
› Hydraulic Brake Assist (HBA)
» page 151.
› Hill Hold Control (HHC)
» page 152.
› Trailer stabilisation (TSA)
» page 162, Towing a trailer .
The ESC system cannot be deactivated. The
» Fig. 130 symbol button can only
be used to deactivate the ASR.
The warning light lights up in the instrument cluster when the ASR is deactiva-
ted.
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Antilock Braking System (ABS)First read and observe the introductory information and safety warn-
ings
on page 150.
ABS prevents the wheels locking when braking. Thus helping the driver to main-
tain 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 pressure
on the brake pedal.
Traction Control System (TCS)
Fig. 131
TCS button
First read and observe the introductory information and safety warn- ings on page 150.
If the wheels are slipping, the TCS adapts the engine speed to the conditions of
the road surface. The TCS makes it much easier to start off, accelerate and climb
steep hills even if the conditions of the road surface are unfavourable.
The TCS function is activated automatically each time the ignition is switched on.
If your vehicle is fitted with the ESC system, the ASR is integrated into the ESC
system » page 150 .
During an intervention of the system, the TCS indicator light flashes in the in-
strument cluster.
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 “rocking a car free” when it has become stuck.
The ASR can be deactivated via the symbol button » Fig. 131
.
The warning light lights up in the instrument cluster when the ASR is deactiva-
ted.
Ensure the TCS is activated again afterwards.
Electronic Differential Lock (EDL)
First read and observe the introductory information and safety warn-
ings
on page 150.
If one of the wheels starts to spin, the EDL system brakes the spinning wheel and transfers the driving force to the other wheels. This ensures the stability of the
vehicle and a quick journey.
The EDL switches off automatically in order to avoid excessive heat generation in
the disc 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. The EDL switches on again automatically as soon as the brake has cooled down.
Driver Steering Recommendation (DSR)
First read and observe the introductory information and safety warn-ings
on page 150.
In critical situations, the DSR provides the driver with a steering recommendation 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.
Hydraulic Brake Assist (HBA)
First read and observe the introductory information and safety warn-ings
on page 150.
The HBA increases the braking effect and helps to reduce the braking distance.
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The HBA is activated by very quick operation of the brake pedal. In order to ach-
ieve the shortest possible braking distance, the brake pedal must be applied firm-
ly until the vehicle has come to a standstill.
The HBA function is automatically deactivated when the brake pedal is released.
The ABS is activated faster and more effectively with the intervention of the HBA.
Hill Hold Control (HHC)
First read and observe the introductory information and safety warn-ings
on page 150.
When driving on slopes, HHC allows you to move your foot from the brake pedal
to the accelerator pedal without having to use the handbrake.
The system holds the brake pressure produced by the activation of the brakepedal for approx. 2 seconds after the brake pedal is released.
The brake pressure drops gradually the more you operate the accelerator pedal. Ifthe vehicle does not start off within 2 seconds, it starts to roll back.
The HHC is active on slops of >5 % if the driver door is closed. HHC is only everactive on slopes when in forward or reverse start off. When driving downhill, it is
inactive.
Parking aid
Introduction
This chapter contains information on the following subjects:
Function
153
Activation/deactivation
153WARNING■ The parking aid is not a substitute for the driver paying proper attention and
it is always the driver's responsibility to take care when reversing the vehicle
or carrying out similar manoeuvres. Pay particular attention to small children
and animals as they may not be recognised by the system sensors.■
Before reversing, you should make sure that there are no small obstacles,
such as rocks, thin posts, trailer drawbars etc. in front or behind your vehicle.
Such obstacles may not be recognised by the system sensors.
■
Under certain circumstances, surfaces of certain objects and types of cloth-
ing cannot reflect the system signals. Thus, these objects or people who wear such clothing are not recognised by the System sensors.
■
External sound sources can have a detrimental effect on the system. Under
adverse conditions, this may cause objects or people to not be recognised by
the system.
CAUTION
■ 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 » Fig. 132 on page 153 button.
Seek help from a specialist garage.■
The sensors must be kept clean (free of ice, etc.) to enable the system to oper-
ate properly.
■
Additionally installed modules such as bicycle carriers can impair the function of
the parking aid.
Note
■ The signal tones for front obstacle recognition are factory-set to be higher than
for rear obstacle recognition.■
The sound of the park-assist can be adjusted via the MAXI DOT display in the
Wizards menu option » page 29.
■
If the system is activated and the selector lever of the automatic gearbox is in
position P (the vehicle cannot move), the warning tone is interrupted and no ob-
stacles are displayed.
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FunctionFig. 132
Range of sensors / system button
First read and observe the introductory information and safety warn- ings
on page 152.
The parking aid (hereafter referred to solely as system) only works when the igni- tion is switched on.
The system supports the driver via audible signals, via the display on the radio or via the factory-installed navigation system when parking and manoeuvring » Ra-
dio user guide, Navigation system user guide.
The system uses ultrasound waves to calculate the distance between the bumper
and an obstacle. The ultrasound sensors are located on the front/rear bumper.
Explanation of graphic - range of sensors in the vicinity of the vehicle
Area » Fig. 132Range of sensors a)A120 cmB60 cmC160 cmD60 cmEb)60 cma)
These are only the approximate ranges of sensors.
b)
Applies only for vehicles with 12 sensors.
The interval between the acoustic signals becomes shorter as the clearance is re-
duced. A continuous tone sounds from a distance of approx. 30 cm - danger area.
From this moment on do not continue driving!
The length of the vehicle can be increased with an installed detachable towing device. The danger area thus begins at a distance of around 35 cm on vehicles
equipped with a factory-fitted towing device.
Towing a trailer
On vehicles equipped with a factory-fitted towing device, only system areas A
and
B
» Fig. 132 are active when towing a trailer.
Activation/deactivation
First read and observe the introductory information and safety warn-
ings
on page 152.
The system is automatically activated by selecting reverse gear or pressing the
» Fig. 132 on page 153 symbol button. The symbol
lights up in the button;
activation is confirmed by a brief acoustic signal.
The system is deactivated by moving out of reverse gear or by pressing the
symbol button, or is deactivated automatically at a speed of over 10 km/h (the
symbol in the button goes out).
On vehicles which only have rear sensors , the system can only be deactivated by
moving out of reverse gear.
Park assist
Introduction
This chapter contains information on the following subjects:
Finding a parking space
154
Parking
155
Manoeuvring out of a parallel parking space
156
Automatic brake assist
156
Information messages
156
The parking aid is part of the park assist system, therefore the information and
safety guidelines » page 152, Parking aid must be read and observed.
Park Assist (in the following referred to as the system) helps drivers park in suita- ble parallel and perpendicular parking places and also to manoeuvre out of paral-lel parking spaces.
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The system only operates if the ignition is switched on.The displays, messages and system instructions are displayed in the MAXI DOTdisplay (in the display only below).
During the parking procedure the system only takes over the steering move-
ments, the pedals continue to be operated by the driver.
When the system is activated, the warning light lights up
» Fig. 133 on
page 154 - .
The traction control system (TCS) must always be switched on when parking.
Basis of the system function
› 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 park-
ing space or forwards from the parking space.
› the automatic turning of the front wheels when parking in, or manoeuvring out
of the parking space.WARNING■ The system does not exempt the driver from his/her responsibility for park-
ing in and manoeuvring out of the parking space.■
External sound sources can have a detrimental effect on parking in and ma-
noeuvring out of the parking space. Under adverse conditions, this may cause
objects or people to not be recognised by the system.
■
When parking in, and manoeuvring out of parking spaces, the system auto-
matically executes quick steering movements. While it is doing so, do not place your hands between the steering wheel – risk of injury!
■
When parking or departing from a parking space on loose or slippery surfa-
ces (gravel, snow, ice etc.), there may be deviations due to the conditions of
the calculated road surface. We therefore recommend not using the system in
such situations.
CAUTION
■ If other vehicles are parked behind or on the kerb, the system can 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, the surfaces or structures of certain objects such
as wire mesh fences or powder snow cannot be detected by the system.
■ The evaluation of the parking space and the parking procedure depend on the
circumference of the wheels. The system only works correctly if the vehicle is fit- ted with the wheel size approved by the manufacturer.■
If wheels other than those approved by the manufacturer are mounted, the re-
sulting position of the vehicle in the parking space can differ slightly. This can be
avoided by readjusting the system at a specialist garage.
■
Under certain circumstances, the system may not function correctly, for exam-
ple, if the vehicle is fitted with snow chains or a temporary spare wheel.
Finding a parking space
Fig. 133
System button / display
First read and observe the introductory information and safety warn- ings
on page 153.
The search for a suitable parking space takes place while the display is switchedoff. If the display is not switched on using the symbol button until the driver
drives past the parking space, the system can assess and display this parking
space.
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
» Fig. 133 symbol button once.
The display shows » Fig. 133 -
.
Finding a perpendicular parking space
›
Drive past the parking space at up to 20 km/h and a distance of 0.5 – 1.5 m.
›
Press the
» Fig. 133 symbol button twice.
The display shows » Fig. 133 -
.
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The search area for the parking space on the driver's side is automatically indica-
ted on the display.
Activate the turn signal on the driver's side if you wish to park on this side of the
road. In the display the search area for the parking space is indicated on the driv-
er's side.
If suitable parking space is found, its parameters are stored until another suitable
parking space has been found or until a distance of 10 m had been driven after
finding the parking space.
To change the parking mode when searching for a parking space, press the
symbol button again.
Parking
Fig. 134
Display
First read and observe the introductory information and safety warn- ings
on page 153.
The time limit for the parking procedure with the help of the system is 6 minutes.
If the system has recognised a suitable parking space, this parking space is
shown in the display » Fig. 134 -
.
›
Continue driving forwards until the display appears » Fig. 134 -
.
›
Stop and make sure that the vehicle does not move forward until the start of
the parking procedure.
›
Select reverse gear or move the selector lever into position R.
›
As soon as the following message is shown in the display:
Steering int. ac-
tive. Monitor 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.
In the event that the parking procedure cannot be carried out in one go, the park- ing process is completed in further stages.›
If the forward arrow in the display flashes » Fig. 134 - engage the 1st gear or
move the selector lever to position D.
›
Wait until the steering wheel automatically turns into the required position and
then carefully drive forwards.
›
If the backwards arrow is flashing in the display » Fig. 134 - , select reverse
gear again or move the selector lever into position R.
›
Wait until the steering wheel automatically turns into the required position and
then carefully reverse.
These steps can be repeated several times one after the other.
As soon as the parking procedure is completed, an audible signal sounds and the
following message appears in the display:
Steering interv. finished. Take over steering!
Explanation of graphic Parking place recognised with the information to drive on.
Parking place recognised with the information to engage the reverse gear.
Indication for selecting the forward gear.
Indication for selecting the reverse gear.
Automatic termination
The system cancels the parking procedure if one of the following cases occurs:
› Speed of 7 km/h repeatedly exceeded during the parking procedure.
› Time limit of 6 minutes exceeded for the parking procedure.
› System button pressed.
› TCS system switched off.
› Intervention of the driver in the automatic steering procedure (stops the steer-
ing wheel).
› Reverse gear disengaged or selector lever moved out of position
R when re-
versing into the parking space.
› Selector lever moved into position
P.
› There is a system fault (system temporarily not available).
› Automatic braking for damage limitation.
If any of the above events occurs, the following warning message is dis-
played. » page 156 .
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Manoeuvring out of a parallel parking spaceFirst read and observe the introductory information and safety warn-
ings
on page 153.
Manoeuvring out
›
Press the
» Fig. 133 on page 154 symbol button once.
›
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: Steering int. ac-
tive. Monitor 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:
Steering interv. finished. Take over steering!
Automatic termination
The system terminates the manoeuvring procedure if one of the following cases
arises.
› Speed of 7 km/h exceeded during the departing procedure.
› System button pressed.
› TCS system switched off.
› Intervention of the driver in the automatic steering procedure (stops the steer-
ing wheel).
› There is a system fault (system temporarily not available).
› Automatic braking for damage limitation.
If any of the above events occurs, the following warning message is dis- played. » page 156 .
Automatic brake assist
First read and observe the introductory information and safety warn-
ings
on page 153.
The system provides assistance to the driver with automatic brake assist. The au-
tomatic brake assist does not exempt the driver from his/her responsibility for
the accelerator, brake and clutch.
Automatic braking for preventing cancellations caused by excessive speeds
Automatic brake support can be used in order to stop the speed from exceeding
7 km/h, thereby preventing the subsequent cancellation of the parking procedure. The parking procedure can be resumed after automatic braking.
Automatic braking takes place only once per parking procedure.
Automatic braking for damage limitation
The system detects an imminent collision based on the driving speed and the dis-
tance from the obstacle, automatic brake support is initiated.
The system function is ended after this automatic brake assist for damage limita-
tion.WARNING■ Automatic brake assist only works as an element of the assist function. The
driver must always be ready to brake the vehicle him/herself.■
Automatic brake assist is ended after around 1.5 seconds. Depress the brak-
ing pedal so that the vehicle does not start moving by itself.
Information messages
First read and observe the introductory information and safety warn-
ings
on page 153.
Park Assist: Speed too high.
Reduce speed to under 40 km/h (parallel parking) or under 20 km/h (bay parking). This message is only displayed at speeds up to around 50 km/h. When the speed
exceeds 50 km/h, reactivate the system using the button.
Speed too high. Take over steering!
The parking procedure was ended because the speed was exceeded. Park with a
max. speed of 7 km/h.
Driver steering intervention: Take over steering!
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 deactiva- ted. Activate the TCS.
ASR deactivated. Take over steering!
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The parking procedure was ended because TCS was deactivated during the park-
ing procedure.
Trailer: Park Assist stopped.
The parking procedure cannot be carried out because a trailer is hitched. Time limit exceeded. Take over steering!
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. System currently 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.
Park Assist stopped. Take over steering!
Assume control of the steering. Complete the parking procedure without using the system.
ASR intervention. Take over steering!
The parking procedure is terminated by a TCS intervention.
PARK ASSIST Turn on turn signal and select reverse gear
The prerequisites for manoeuvring out of a parking space using the system have
been met. Switch on the turn signals and shift into reverse.
Please take over steering and drive on.
The manoeuvring procedure out of a parallel parking space has ended. Assume control of the steering.
Automatic space departure not possible. Space too small.
The manoeuvring procedure using the system is not possible. The parking gap is
too small.
Park Assist: Brake interv. Speed too high.The driving speed during the parking procedure was too high - automatic brake
assist is initiated.
Cruise Control System
Introduction
This chapter contains information on the following subjects:
Activating/deactivating
158
Storing and maintaining speed
158
Changing the stored speed
158
Switching off temporarily
158
The Cruise Control System (CCS) maintains a set speed, more than 25 km/h, with-
out you having to actuate the accelerator pedal.
This is only possible within the range which is permitted by the power output and
braking power of the engine.
The warning light
illuminates in the instrument cluster when the cruise control
system is switched on.
WARNING■ For safety reasons, the cruise control system must not be used in dense
traffic or on unfavourable road surfaces (such as icy roads, slippery roads,
loose gravel) – risk of accident!■
The saved speed may only be resumed if it is not too high for the current
traffic conditions.
■
Always deactivate the cruise control system after use to prevent the system
being switched on unintentionally.
CAUTION
■ The cruise control system is not able to maintain a constant speed when driving
in areas with steeper gradients. The weight of the vehicle increases the speed at which it travels. In such cases, select a lower gear or brake the vehicle using the
footbrake.■
The cruise control system cannot be activated when first gear or reverse gear is
selected (vehicles with manual transmission).
157Assist systems