Assist systems
Brake assist systems
Introduction
This chapter contains information on the following subjects:
Electronic Stability Control (ESC)
154
Antilock brake system (ABS)
155
Traction Control System (ASR)
155
Electronic Differential Lock (EDL)
155
Driver Steering Recommendation (DSR)
155
Hydraulic Brake Assist (HBA)
155
Hill Hold Control (HHC)
156WARNING■ 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 manufac-
turer 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 173, 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 with the warning light
» page 38 .
Electronic Stability Control (ESC)Fig. 146
ESC system: ASR button
Read and observe and on page 154 first.
The ESC system helps to maintain control of the vehicle in situations where it
is being operated at its dynamic limits, such as a sudden change to the direc-
tion of travel. Depending on the road surface conditions, the risk of skidding is
reduced, 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 actual behaviour of the vehicle. If differences exist, such as the car begin-
ning to skid, the ESC system will automatically brake the appropriate wheel.
During an intervention of the system, the warning light flashes in the instru-
ment cluster.
The following systems are integrated into the Electronic Stability Control
(ESC) .
› Antilock Brake System (ABS)
» page 155.
› Traction control (ASR)
» page 155.
› Electronic Differential Lock (EDL)
» page 155.
› Driver Steering Recommendation (DSR)
» page 155.
› Hydraulic Brake Assist (HBA)
» page 155.
› Hill Hold Control (HHC)
» page 156.
› Trailer stabilisation (TSA)
» page 172.
The ESC system cannot be deactivated. The
» Fig. 146 button can only be
used to deactivate the ASR.
The warning light illuminates in the instrument cluster when the ASR is de-
activated.
154Driving
The ABS is activated faster and more effectively with the intervention of the
HBA.
Hill Hold Control (HHC)
Read and observe
and on page 154 first.
When driving on slopes, HHC allows you to move your foot from the brake ped-al to the accelerator pedal without having to use the handbrake.
The system holds the brake pressure produced by the activation of the brake pedal for approx. 2 seconds after the brake pedal is released.
The brake pressure drops gradually the more you operate the accelerator ped-
al. If the vehicle does not start off within 2 seconds, it starts to roll back.
HHC is active on slopes of >5 % when the driver door is closed. HHC is always only active on slopes when in forward or reverse start off. When driving down-
hill, it is inactive.
Parking aid
Introduction
This chapter contains information on the following subjects:
Function
157
Activation/deactivation
157WARNING■ 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 vehi-
cle. Such obstacles may not be recognised by the system sensors.
■
Under certain circumstances, surfaces of certain objects and types of
clothing 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. Un-
der adverse conditions, this may cause objects or people to not be recog-
nised 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 button » Fig. 148 on
page 157 . Seek help from a specialist garage.■
The sensors must be kept clean (free of ice, etc.) to enable the system to op-
erate properly.
■
Under adverse weather conditions (heavy rain, water vapour, very low or
high temperatures etc.), the system function may be limited - “incorrect recog-
nition of obstacle”.
■
Additionally installed accessories such as e.g. bicycle carriers can impair the
system function.
Note
■ The signal tones for front obstacle recognition are factory-set to be higher
than for rear obstacle recognition.■
If not all fields around the vehicle are shown after the system is activated,
the vehicle will need to be moved a few metres forwards or in reverse.
■
The sound of the park assist can be adjusted via the MAXI DOT display in the
Assistants menu option » page 47.
■
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
obstacles are displayed.
156Driving
FunctionFig. 148
Range of sensors / system button
Read and observe
and on page 156 first.
The parking aid (referred to below 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 manoeu-
vring » Radio 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.
Image description - approximate range of the sensors
Range » Fig. 148Range of sensorsA120 cmB60 cmC160 cmD60 cmEa)60 cma)
Applies only for vehicles with 12 sensors.
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!
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. 148 are active when towing a trailer.
Activation/deactivation
Read and observe
and on page 156 first.
The system is automatically activated by selecting reverse gear or pressing
the symbol button
» Fig. 148 on page 157 . The symbol
illuminates in the
button; activation is confirmed by a brief acoustic signal.
The system is deactivated by moving out of reverse gear, either by pressing the symbol button or automatically at a speed exceeding 10 km/h (the sym-
bol 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:
Functioning
158
Finding a parking space
158
Parking
159
Departing from a parallel parking space
160
Automatic emergency braking
160
Information messages
160
Park Assist (in the following referred to as the system) helps drivers park in
suitable parallel and perpendicular parking places and also to manoeuvre out
of parallel parking spaces.
The system takes over the steering movements when parking or driving out of
the parking space, the driver operates the pedals as well as the gear lever.
The state in which the steering wheel is operated by the system, is referred to
as parking operation.
157Assist systems
›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 occurs, the following message is dis-
played » page 160 .
Departing from a parallel parking space
Read and observe
and on page 158 first.
Manoeuvring out
›
Press the symbol button once
» Fig. 149 on page 158 .
›
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:
Take over steering and continue driving
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 occurs, the following message is dis-
played » page 160 .
Automatic emergency braking
Read and observe
and on page 158 first.
If the system detects a risk of collision during parking, automatic emergency
braking 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 158 first.
Park Assist: 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. 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 ASR system is deac-
tivated. Activate the ASR.
ASR deactivated. Take over steering!
The parking procedure was ended because ASR 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!
The parking procedure was ended because the time limit of 6 minutes was
passed.
Park Assist currently not available.
160Driving
Operating conditions for the systemFig. 152
MAXI DOT display: Engine is au-
tomatically switched off / auto-
matic engine cut off is not possi-
ble
Read and observe on page 162 first.
For system-dependent automatic engine shutdown to work, the following
conditions must be met.
The driver's door is closed.
The driver has fastened the seat belt.
The bonnet is closed.
The driving speed exceeded 4 km/h after the last stop.
No trailer is coupled.
Some additional conditions for the system to function correctly cannot be in-
fluenced or recognised by the driver. Therefore, the system can react differ-
ently in situations which are identical from the driver's perspective.
If after stopping the car, the message UNABLE TO START STOP appears in the
segment display or in the MAXI DOT display the check mark
» Fig. 152 , then
the conditions for automatic engine shutdown are not met.
Running the engine is essential for the following reasons, for example.
› The engine temperature for the proper function of the system has not yet
been reached.
› The charge state of the vehicle battery is too low.
› The current consumption is too high.
› High air conditioning capacity (high fan speed, big difference between the
desired and actual interior temperature).
Note■ If the vehicle remains outdoors for a long time in minus temperatures or in
direct sunlight, it can take several hours until the internal temperature of the
vehicle battery reaches a suitable temperature for proper operation of the sys-
tem.■
If the driver's seat belt is removed for more than approx. 30 seconds or the
driver's door is opened during stop mode, the engine will have to be started
manually.
■
After the manual engine start and with a manual gearbox the automatic en-
gine shutdown can take place only when a minimum distance required for the
system function has been covered.
Operation in vehicles with manual gearbox
Read and observe
on page 162 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Stop the vehicle.
›
Shift the gear lever to Neutral.
›
Release the clutch pedal.
Automatic engine shutdown takes place, segment display shows START STOP
ACTIVE or a check mark appears in the MAXI DOT display
» Fig. 152 on
page 163 .
Automatic engine start
›
Depress the clutch pedal.
The automatic start procedure takes place again.
Operation in vehicles with automatic gearbox
Read and observe
on page 162 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Bring the vehicle to a stop and depress the brake pedal.
163Assist systems
Save tyre pressure valuesFig. 154
Key for storing the pressure val-
ues
Read and observe on page 165 first.
Saving the tyre pressure values is undertaken as follows.
›
Inflate all the tyres to the specified pressure.
›
Switch on the ignition.
›
Press and hold the symbol button
» Fig. 154 .
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 button.
The tyre pressure values are always stored in the system, if one of the follow-
ing events occurs.
› Change of tyre inflation pressure.
› Changing one or more wheels.
› Changing position of a wheel on the vehicle.
› Illumination of the warning light
in the instrument cluster.
WARNINGBefore storing the pressures, the tyres must be inflated to the specified in-
flation pressure » page 198. 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.Hitch and trailer
Hitch
Introduction
This chapter contains information on the following subjects:
Description
167
Adjusting the ready position
167
Fitting the ball head
168
Check proper fitting
168
Removing the ball head
169
Accessories
169
The maximum trailer drawbar load is 80 kg/h.
WARNING■
Check that the ball head is seated correctly and is secured in the mount-
ing recess before starting any 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 equipment in any way.
■
Never release the ball head while the trailer is still coupled.
■
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 180.■Tow the vehicle by means of the detachable ball rod » page 214.166Driving
DescriptionFig. 155
Carrier for the towing device / tow bar
Read and observe
and on page 166 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 device and tow bar » Fig. 155
13-pin power socket
Safety eyelet
Mounting recess
Cap
Dust cap
Ball head
Operating lever
Lock cap
Release pin
Key
locking ball
Note
If you lose the key, please get in touch with a specialist garage.1234567891011Adjusting the ready positionFig. 156
Setting the ready position/ready position
Read and observe
and on page 166 first.
The coupling ball bar must be set prior to installation in the standby position.
If this is not in the ready position, then this must be set to the standby posi-
tion as follows.
›
Grip the ball head below the protective cap
2
.
›
Remove the cap from the lock.
›
Insert the key into the lock, so that its green marking is pointing upwards.
›
Turn key
1
in direction of the arrow, so that the red marking is facing up-
wards » Fig. 156 .
›
Press the release pin
3
as far as the stop in the direction of the arrow and
at the same time push the lever
4
downwards as far as it will go in the di-
rection of the arrow.
The operating lever remains locked in this position.
CAUTION
In the ready position, the key cannot be removed nor turned to a different po-
sition.167Hitch and trailer
Removing the ball headFig. 159
Unlock the operating lever of the ball head/removing the ball
head
Read and observe
and on page 166 first.
›
Remove cover
1
» Fig. 159 from the lock in the direction of the arrow.
›
Insert the key into the lock, so that its green marking is pointing upwards.
›
Turn the key
2
180° to the left so that its red marker points upward.
›
Grasp the ball head from underneath.
›
Press the release pin
3
as far as the stop in the direction of the arrow and
at the same time push the lever
4
downwards as far as it will go in the di-
rection of the arrow.
The ball head is released in this position and falls freely into the hand. If it
does not fall freely into the hand, use your other hand to push it upwards.
At the same time, the ball head latches into the ready position and is thus
ready to be re-inserted into the mounting recess »
.
›
Place the cap
4
» Fig. 155 on page 167 onto the mounting recess.
WARNINGNever allow the ball head to remain unsecured in the boot. This could
cause damage to the boot upon sudden braking, and could put the safety
of the occupants at risk.CAUTION■ If the lever is held firmly and not pushed downwards as far as it can go, it will
go back up after the ball head is removed and will not latch into the ready po-
sition. The ball head then needs to be brought into this position before the
next time it is fitted.■
Tuck the ball bar in the ready position, with the golden key up, in the box -
otherwise there is a risk of damage to the key!
■
Do not use excessive force when handling the operating lever (e.g. do not
step on it).
Note
■ We recommend that you put the protective cap on the ball before removing
the ball head.■
Clean any dirt from the ball head before stowing it away in the box with the
vehicle tool kit.
Accessories
Fig. 160
Representation of the maximum
permissible level of the ball head
of the towing hitch and the per-
missible total weight of the ac-
cessories including the load de-
pending on the load center of
gravity
Read and observe and on page 166 first.
An accessory can mounted on the ball head of the towing hitch (e.g. bike carri-
ers).
If this accessory is used, the maximum permissible overhang of the ball head
of the towing hitch and the permissible gross vehicle weight of the accesso-
ries including load are to be checked.
The maximum permissible overhang of the ball head of the towing hitch is 70
cm » Fig. 160 .
The total permitted weight of the accessory including load changes with in-
creasing distance of the centre of gravity of the load from the ball head of the
towing hitch.
169Hitch and trailer