Driver assistance systems
● Do not s
t
op in the water, use reverse gear
or switch off the engine.
● Oncoming traffic will cause waves which
raise the l
evel of the water, making it difficult
to cross the water.
The Start/Stop system must be deactivated
when driving through flooded areas WARNING
When driving through water, mud, melted
sno w
, etc., please remember that due to
damp or frozen brake discs and shoes in win-
ter, the braking effect may be delayed, there-
fore the required braking distance is greater.
● “Dry the brakes and remove ice” by braking
caref
ully. Ensure that you are not endanger-
ing other road-users or breaking traffic regu-
lations in the process.
● After driving through water, avoid sudden
sharp manoeu
vres. CAUTION
● Drivin g thr
ough flooded areas may severely
damage vehicle components such as the en-
gine, transmission, drive train or electrical
system.
● Never drive through salt water as salt cau-
ses c
orrosion. Always rinse any parts of the
vehicle which have been in contact with salt
water. Driver assistance systems
Br ak
in
g and stability systems
Brake assist systems The brake assist systems ESC, ABS, BAS, ASR
and EDL on
ly
operate when the ignition is
switched on. They contribute significantly to
increasing active safety.
Electronic Stability Control (ESC)
ESC reduces the risk of skidding and increa-
ses the vehicle stability by braking individual
wheels under specific driving conditions. ESC
detects critical handling situations, such as
understeer, oversteer and wheelspin on the
driven wheels. The system stabilises the ve-
hicle by braking individual wheels or by re-
ducing the engine torque.
The ESC has limits. It is important to realise
that the ESC is also subject to the laws of
physics. ESC will not be able to deal with all
situations with which drivers may be faced.
For example, if the road surface changes sud-
denly then ESC will not be useful in all cases.
If the vehicle suddenly enters a section cov-
ered by water, mud or snow then ESC will not
provide assistance in the same way as on dry
ground. If the vehicle loses its grip on the
ground and moves on a film of water (“aqua-
planing”), the ESC will not be able to assist the driver to control the vehicle as the loss of
adher
enc
e with the road surface will prevent-
ing braking and steering. If the vehicle is
driven through series of bends at high
speed, the ESC will not always be as effec-
tive: the vehicle reaction to aggressive driv-
ing is not the same as at reduced speeds.
When driving with a trailer, ESC does not pro-
vide the same amount of vehicle control as
without a trailer.
Adjust your speed and driving style to road,
traffic and weather conditions. ESC cannot
push the limits of the laws of physics; im-
prove the transmission available or maintain
the vehicle on the road if a lack of driver at-
tention creates an inevitable situation. Other-
wise, ESC assists in maintaining vehicle con-
trol in extreme situations and uses the move-
ments of the steering made by the driver to
maintain the vehicle moving in the desired
direction. If the vehicle is driven at such a
speed that it will leave the road before ESC
can intervene then the system cannot pro-
vide assistance.
The ABS, BAS, ASR and EDL systems are in-
corporated into the ESC. The ESC is always
on. The ESC should only be turned off using
the ASR button ›››
Fig. 206 when traction is
insufficient. Always remember to turn on the
ASR once more when the vehicle has traction
again. »
205
Technical data
Advice
Operation
Emergencies
Safety
Operation
Anti-lock system (ABS)
ABS c
an pr
event the wheels from locking dur-
ing braking until just before the vehicle stops
thus helping the driver to steer the vehicle
and maintain control. This means that, even
during full braking, the risk of skidding is re-
duced:
● Press and hold the brake pedal fully. Do not
remov
e your foot from the brake pedal or re-
duce braking force!
● Do not “pump” the brake pedal, or reduce
brakin
g force!
● Maintain vehicle direction when braking
ful
ly.
● When the brake pedal is released or when
the brake f
orce is reduced, ABS is turned off.
ABS control can be observed by vibration of
the brake pedal and noise. You should never
expect the ABS to reduce the braking dis-
tance under any circumstances. This distance
will increase when driving on gravel, recent
snow or on icy and slippery ground.
When driving on loose ground, the all-terrain
configuration of the ABS is automatically
turned on. When ABS is activated, the front
wheels may lock briefly. This shortens the
braking distance in off-road situations as the
wheels are prevented from digging into loose
surfaces. All-terrain ABS only intervenes
when driving in a straight line. When the front wheels are turned, the normal ABS is
activated.
Br
ake assist system (BAS)
The brake assist system may reduce the re-
quired braking distance. The brake assist
system boosts the braking force if you press
the brake pedal quickly in an emergency. As
a result, the braking pressure increases rap-
idly, the braking force is multiplied and the
braking distance is reduced. This enables the
ABS to be activated more quickly and effec-
tively.
Do not lift your foot off the brake pedal!
When the brake pedal is released or when
the brake force is reduced, braking assist au-
tomatically turns off the brake servo.
Traction control when accelerating (ASR)
In the event of wheelspin, the traction control
system reduces the engine torque to match
the amount of grip available. The ASR makes
some situations easier, for example, when
starting, accelerating or going uphill, even in
unfavourable road conditions.
The ASR can be switched on or off manually
››› page 207.
Electronic differential lock system (EDS)
EDL is available when driving in straight lines
under normal conditions. When the EDL de-
tects wheelspin, it brakes the spinning wheel and directs the power to the other drive
wheels. T
o prevent the disc brake of the
braked wheel from overheating, the EDL cuts
out automatically if subjected to excessive
loads. The EDL will switch on again automati-
cally when the brake has cooled down.
Electronic drive torque management (XDS)
When taking a curve, the driveshaft differen-
tial mechanism allows the outer wheel to turn
at a higher speed than the inner wheel. In
this way, the wheel that is turning faster (out-
er wheel) receives less drive torque than the
inner wheel. This may mean that in certain
situations the torque delivered to the inner
wheel is too high, causing the wheels to
spin. On the other hand, the outer wheel is
receiving a lower drive torque than it could
transmit. This causes an overall loss of lateral
grip on the front axle, resulting in understeer
or “lengthening” of the trajectory.
The XDS system can detect and correct this
effect via the sensors and signals of the ESC.
Via the ESC, the XDS will brake the inside
wheel and counter the excess driving torque
of that wheel. This means that the driver's
desired trajectory is much more precise.
The XDS system works in combination with
the ESC and is always active, even when ASR
traction control is disconnected.
206
Driver assistance systems
WARNING
Driving at high speed on icy, slippery wet
grou nd c
an result in loss of vehicle control
and serious injury to the driver and passen-
gers.
● Adjust your speed and driving style to visi-
bility
, road, traffic and weather conditions.
Even though the brake assist systems, ABS,
BAS, EDL, ASR and ESC, provide more securi-
ty, do not take unnecessary risks while driv-
ing.
● Brake assist systems can not overcome the
law
s of physics. Even with ESC and other sys-
tems, slippery and wet roads will always be
dangerous.
● Driving to quickly on wet ground can result
in the wheels lo
sing contact with the ground
in an effect known as “aquaplaning”. Without
adherence, it is impossible to brake, steer or
control the vehicle.
● Brake assist systems cannot avoid acci-
dents if
, for example, the driver does not re-
spect safety distances or drives to quickly in
difficult conditions.
● Even though brake assist systems are ex-
tremely eff
ective and help control the vehicle
in difficult situations, remember that the ve-
hicle stability depends on tyre grip.
● When accelerating on a slippery surface,
for ex
ample on ice or snow, press the acceler-
ator carefully. The wheels can still slip even
with brake assist systems resulting in loss of
vehicle control. WARNING
The effectiveness of the ESC can be consider-
ably r
educed if other components and sys-
tems affecting driving dynamics are not main-
tained or are not functioning correctly. This
includes, among others, brakes, tyres and
other systems already mentioned.
● Remember that changing and fitting other
components
to the vehicle can affect opera-
tion of the ABS, BAS, ASL EDL and ESC.
● Changes to the vehicle suspension or using
unap
proved wheel/tyre combinations can af-
fect operation of the ABS, BAS, ASL EDL and
ESC, as well as their effectiveness.
● Likewise, the effectiveness of ESC depends
on the use of s
uitable tyres ››› page 288. Note
● To en s
ure that the ESC and ASR work prop-
erly, all four wheels must be fitted with iden-
tical tyres. Any differences in the rolling radi-
us of the tyres can cause the system to re-
duce engine power when this is not desired.
● If a malfunction should occur in the ABS,
the ESC, EDL and ASR w
ill also be out of ac-
tion.
● Noises may be heard while any of the
above sy
stems are operating. Switching ASR on and off
Fig. 206
Detailed view of the centre console:
b utt
on u
sed to switch ASR on and off (vehi-
cles with ESC) The electronic stability control ESC consists
of
ABS, EDL
and ASR and on
ly works when
the engine is running.
The ASR can be switched off while the engine
is running by pressing the OFF
› ›
› Fig. 206
b
utton. The ASR (and similar) is only switch-
ed off when the required traction is not ob-
tained:
● When driving through deep snow or on
loose grou
nd (gravel, etc.).
● When “freeing” a trapped vehicle.
Turn the ASR bac
k on by pressing the but-
ton OFF
›
› ›
Fig. 206
.
207
Technical data
Advice
Operation
Emergencies
Safety
Operation
Start assist systems Intr oduction WARNING
The intelligent technology in the start assist
sys t
ems cannot change the laws of physics.
The improved comfort provided by start as-
sist systems should not prompt you to take
risks.
● Unintentional movements of the vehicle
coul
d cause serious injury.
● The start assist systems are not a replace-
ment for driv
er awareness.
● Always try to adapt the speed of the vehi-
cle and
your style of driving to the condition
of the ground or the road and to weather and
traffic conditions.
● The start assist system cannot keep the ve-
hicle s
tationary in all conditions on a gradi-
ent or cause it to brake on steep downhill
gradients, e.g. if the road is slippery or icy. Auto Hold function*
Fig. 207
Detailed view of the centre console:
Aut o Ho
l
d button The control lamp on the button switches on
when the Aut
o Ho
l
d function is on.
When the Auto Hold function is on, this helps
the driver if they must regularly stop the vehi-
cle or if they must stop with the engine run-
ning for prolonged periods, for example, on
hills, before a traffic light or in traffic jams
with continuous stopping and starting.
The Auto Hold function automatically pre-
vents the vehicle from rolling away acciden-
tally when at a standstill, without the driver
having to keep his/her foot on the brake ped-
al.
When the system that detects that the vehi-
cle has stopped, the Auto Hold keeps the ve-
hicle at a standstill. The brake pedal can be
released. If the driver presses the brake pedal briefly or
the accel
erator to start off, the Auto Hold
function releases the brake once more. The
vehicle moves according to the gradient.
If any of the conditions necessary for the Au-
to Hold function change while the vehicle
stopped, the system is turned off as is the in-
dicator on the button ››› Fig. 207. The elec-
tronic parking brake engages where necessa-
ry to park the vehicle safely ››› .
C ondition
s
for keeping the vehicle at a
standstill with Auto Hold:
● The driver door must be closed.
● The driver seat belt must be buckled.
● The engine must be running.
● The ASR system is switched on
›››
page 189.
Automatically engaging and disengaging the
Auto Hold function
If the Auto Hold function was engaged with
the AUTO HOLD button before disengaging the
ignition, the f u
nction w
ill automatically re-
main engaged after the ignition is re-engag-
ed.
If the Auto Hold function was not disengag-
ed, it will automatically remain disengaged
after the ignition is engaged.
208
Driver assistance systems
Permanent Auto Hold connection
The Aut o Ho
l
d function must be switched on
every time the engine is started. However, to
switch the Auto Hold function on permanent-
ly, the mark must be switched on in the Set-
tings menu, “Autohold” submenu
››› page 26.
Auto Hold works automatically under the fol-
lowing conditions:
All points must be fulfilled simultaneously
››› :
Manual gearboxAutomatic gearbox
1.If the vehicle is stopped using the brake pedal on a
flat or slope.
2.The engine must be “running smoothly”.
3.On a slope, the 1st gear
is engaged uphill or the
reverse gear is engaged
for a downhill. The
clutch must be held
down.A gear for driving is se-
lected from R, D or S.
Upon accelerating and
pressing in the clutch
simultaneously, the
brake releases gradual-
ly.Upon accelerating, the
brake releases gradual-
ly. Auto Hold turns off automatically under the
f
o
l
lowing conditions:
Manual gearboxAutomatic gearbox
1.If one of the conditions mentioned in table on
page 209 changes.
2.If the engine is “not running regularly” or if there is a malfunction.
3.When changing to idle
speed.If the selector lever is
placed in neutral (N).
4.If the engine is turned
off or stalls.If the engine is switch-
ed off.
5.If the driver accelerates
while pressing the
clutch in.If the vehicle is acceler-
ated.
6. When one of the wheels
has minimal contact
with the ground (e.g. on
uneven ground). WARNING
The Auto Hold technology is limited by the
la w
s of physics. The improved comfort provi-
ded by Auto Hold should never prompt you to
take risks.
● Never leave the vehicle running and with
the Auto Hol
d function switched on.
● Auto Hold cannot always stop the vehicle
uphill
and downhill (e.g. if the ground is slip-
pery or frozen). CAUTION
Before entering an automatic car wash, al-
wa y
s switch the Auto Hold function off, as it
could be damaged when the electronic park-
ing brake automatically engages. Start-Stop Function*
Fig. 208
Detailed view of the centre console:
St ar
t
-Stop function button With the Start-Stop system enabled, the en-
gine i
s
aut
omatically stopped when the vehi-
cle is at a standstill. The engine restarts auto-
matically when required.
The function is enabled automatically when-
ever the ignition is switched on. The instru-
ment panel displays information on the cur-
rent status. »
209
Technical data
Advice
Operation
Emergencies
Safety
Operation
Vehicles with a manual gearbox
● When the vehicle is at a standstill, leave it
in neutr al
and t
ake your foot off the clutch.
The engine switches off.
● Simply depress the clutch pedal to move
off again.
V
ehicles with an automatic gearbox
● When the vehicle is at a standstill, depress
the brake or k
eep it pressed down. The en-
gine switches off.
● The engine will start again as soon as you
rele
ase the brake pedal.
● With the selector lever set to position P, the
engine wi
ll not start until a range of gears is
selected or the accelerator pedal is de-
pressed.
Important conditions for the engine to auto-
matically switch off
● The driver seat belt must be buckled.
● The driver door must be closed.
● The bonnet must be closed.
● The factory-fitted towing bracket must not
be electrical
ly connected to a trailer.
● A minimum engine temperature has been
reac
hed.
● The steering wheel must not be turned
more than 270 de
grees.
● The vehicle has moved since the last stop. ●
In vehic
les with Climatronic: the tempera-
ture inside the vehicle is within the pre-set
temperature range.
● The temperature set is neither very high nor
very
low.
● The air conditioning defrost function is not
switc
hed on.
● In vehicles with Climatronic: the blower has
not been manual
ly set to a high speed.
● The power level of the vehicle's battery is
sufficient
.
● The vehicle's battery temperature is neither
too high nor too lo
w.
● The vehicle is not on a steep gradient or
slope.
● The front
wheels are not overly turned.
● The heated windscreen is not switched on.
● Reverse gear is not engaged.
● The park assist system is not switched on.
Conditions
for automatically restarting the
engine
The engine may automatically restart under
the following conditions:
● If the vehicle interior is too hot or too cold.
● If the vehicle moves.
● If the vehicle's battery voltage drops. Conditions requiring the key to restart the
engine
The engine mu
st be started manually under
the following conditions:
● If the driver unbuckles his/her seat belt.
● If the driver door is opened.
● If the bonnet is opened.
● In vehicles with a manual gearbox: if a gear
has
been selected.
Switching Start-Stop mode on and off man-
ually
● Press the button on the centre console
› ›
›
Fig. 208.
● The button will light up when the Start-Stop
function i
s switched off.
The engine will start immediately if the vehi-
cle is in Stop mode when it is switched off
manually. WARNING
The brake servo and the power steering do
not w ork
when the engine is switched off.
● Never allow the vehicle to move when the
engine is
switched off. CAUTION
Using the Start-Stop function for a long peri-
od at v
ery high outside temperatures could
damage the vehicle's battery. 210
Operation
● Ob
ser
ve the surrounding area and acceler-
ate carefully at a maximum of 7 km/h
(4 mph).
● The park assist system is only r
esponsible
for moving the steering wheel during the ma-
noeuvre. The driver applies the accelerator,
the clutch, the gears and the brake.
● Follow the instructions given by the park
ass
ist system until the manoeuvre is comple-
ted.
● The park assist system steers the vehicle
forw
ards and backwards until it is in a
straight position in the parking space.
● The manoeuvre is complete when the corre-
sponding indic
ation is given on the instru-
ment panel display.
Stopping the parking manoeuvre
The park assist system stops the manoeuvre
in advance in the event of one of the follow-
ing:
● Press button .
● Driving faster than 7 km/h (4 mph).
● The driver moves the steering wheel.
● The parking manoeuvre has not been com-
p l
et
ed after 6 minutes since the park assist
system was activated.
● A sliding door is opened. To restart the ma-
noeuvr e, c
lose the sliding door and press the
button again. ●
Ther e i
s
a system malfunction (system tem-
porarily unavailable).
● The ASR system is switched off or the ASR
or ESC i
s working. WARNING
The steering wheel turns quickly by itself
when park in
g using the park assist system.
Placing your hand between the steering
wheel spokes could lead to injuries. Note
● The park a
ssist system has its limitations.
For example, it is not possible to park on
tight bends using the park assist system.
● Even if the park assist system recognises
that ther
e is not enough space for parking
the vehicle, the instrument panel display will
still show this place. In this case, the parking
manoeuvre should not be requested.
● Changing gears between forward and re-
verse g
ears before indicated (that is, before
the signal from the parking sensor system)
the parking results may not be ideal.
● For parallel parking (parallel to the road), a
sound wi
ll tell the driver when they must
change from forward gears to reverse; the
signal from the parking sensor system does
not indicate changes of direction.
● The park assist can also be activated after-
ward
s, if you pass close to a parallel parking
space at a maximum of 40 km an hour
(25 mph) or close to be perpendicular parking space at about 20 km an hour (12 mph) then
pre
s
s the button .
● The progress bar on the screen of the in-
strument p
anel shows a display of the rela-
tive distance to be covered.
● When the Park Assist system is turning the
steerin
g wheel of the stopped vehicle the
symbol is also displayed. Press on the
brake pedal so that the steering can turn with
the vehicle at a standstill and thus reduce the
number of manoeuvres.
● A “suitable” parking space length is at
lea
st 1.1 m greater than the length of the ve-
hicle.
● If the results of the park assist system are
not as
good after changing the wheels, the
system must memorise the perimeter of the
new wheels. This process is performed auto-
matically while the vehicle is in motion. To
help this process, turn slowly (at less than
20 km/h [12 mph]), e.g. in an empty car park. Leaving a parking space using the
P
ark
As
sist system Driving off
● Switch on the engine.
● Press button . When the function is ena-
b l
ed, the b
utton ››› Fig. 213 will light up.
● Apply the turn signal for the side on which
you w ant
to leave the parking space.
● Select reverse gear.
216
Driver assistance systems
Display help. The help list explains the
s ur
f
aces and lines on the camera image.
Press to exit help.
Mute the sound.
Adjust the display: brightness, contrast,
colour.
Switching on the orientation points for
rear parking perpendicular to the road
(mode 1).
Displaying the optical parking system.
Operations in vehicles with no optical parking
system (OPS)
Switching the dis-
play on automati-
cally:Select reverse gear with the igni-
tion switched on or the engine run-
ning. Mode 1 will be displayed.
Switching the dis-
play off manually:
Press a button to select the area on
the radio or the navigation system
››› Booklet Radio or ››› Booklet Navi-
gation system.
OR: press the button
on the
screen.
OR: after switching off the ignition,
the rear assist image remains on
the screen for a short period.
Switching off the
display by disen-
gaging reverse
gear:The image will switch off after
around 10 seconds.
Switching off the
display by driving
forwards:Drive forwards at more than ap-
prox. 15 km/h (9 mph). 3
4
5
6
7
Operations in vehicles with the optical parking
system (OPS)
Switching the dis-
play on automati-
cally:Select reverse gear with the igni-
tion switched on or the engine run-
ning. Mode 1 will be displayed.
Switching the dis-
play off manually:
Press a button to select the area on
the radio or the navigation system
››› Booklet Radio or ››› Booklet Navi-
gation system.
OR: press the button
on the
screen.
OR: after switching off the ignition,
the rear assist image remains on
the screen for a short period.
Press button .
Switching off the
display by disen-
gaging reverse
gear:The OPS display will immediately
be shown.
Switching off the
display by driving
forwards:Drive forwards at more than ap-
prox. 10 km/h (6 mph). Things to note
1) Do not use the rear assist system in the fol-
lowing cases:
– If there is a fault in the dynamic chassis control (DCC).
– If the image displayed is not very clear or reliable (low
visibility or dirty lens).
– If the space behind the vehicle cannot be clearly or
completely recognised.
1) Do not use the rear assist system in the fol-
lowing cases:
– If the vehicle has been overloaded at the rear.
– If the driver is not familiar with the system.
– If the rear lid is open.
– If the position and installation angle of the camera
have been changed, e.g. in a rear-end collision. Have a
specialised workshop check the system.
2) Optical illusions of the camera (examples)
The rear assist camera produces two-dimensional im-
ages. Any cracks in or objects protruding from the
ground or from other vehicles are more difficult to spot
or cannot be seen due to a lack of depth in the image
displayed.
Objects or other vehicles may seem to be closer or fur-
ther away than what they really are:
– On changing from a flat surface to a slope or gradient.
– On changing from a slope or gradient to a flat surface.
– If the vehicle has been overloaded at the rear.
– On approaching protruding objects. These objects
may be outside the angle of vision of the camera when
reversing.
Cleaning the camera lens
K
eep the c
amer
a lens clean and clear of snow
and ice:
● Moisten the lens using a commercially
avail
able, alcohol-based glass cleaning »
219
Technical data
Advice
Operation
Emergencies
Safety