140Driving and operating● The stop-start system is notmanually deactivated.
● The driver's door is closed or the driver's seat belt is fastened.
● The vehicle battery is sufficiently charged and in good condition.
● The engine is warmed up.
● The engine coolant temperature is not too high.
● The engine exhaust temperature is not too high, e.g. after driving
with high engine load.
● The ambient temperature is above -5 °C.
● The climate control system allows an Autostop.
● The brake vacuum is sufficient.
● The self-cleaning function of the diesel particle filter is not active.
● The vehicle was driven at least at
walking speed since the last
Autostop.
Otherwise an Autostop will be
inhibited.Certain settings of the climate control
system may inhibit an Autostop. See
Climate control chapter for more
details 3 124.
Immediately after higher speed
driving an Autostop may be inhibited.
New vehicle running-in 3 134.
Vehicle battery discharge protection To ensure reliable engine restarts,
several vehicle battery discharge
protection features are implemented
as part of the stop-start system.
Power saving measures
During an Autostop, several electrical
features such as auxiliary electric
heater or rear window heating are
disabled or switched to a power
saving mode. The fan speed of the
climate control system is reduced to
save power.
Restart of the engine by the driver
Vehicles with manual transmission
Depress the clutch pedal without
depressing the brake pedal to restart the engine.Vehicles with automatic transmission
The engine is restarted if
● you release the brake pedal while
the selector lever is in position D
or M
● or the brake pedal is released or the selector lever is in position N
when you move the selector lever
to position D or M.
● or you move the selector lever to
position R.
Restart of the engine by the stop- start system
The selector lever must be in neutral to enable an automatic restart.
If one of the following conditions occurs during an Autostop, the
engine will be restarted automatically by the stop-start system:
● The stop-start system is manually deactivated.
● The driver's seat belt is unfastened and the driver's door
is opened.
● The engine temperature is too low.
150Driving and operatingWhen clutch slip is detected for a
specific time, the engine power will be
reduced. A warning is displayed in the Driver Information Centre. Release
the clutch.Caution
It is not advisable to drive with the hand resting on the selector lever.
Gear shift indication 3 96.
Stop-start system 3 139.
Brakes
The brake system comprises two
independent brake circuits.
If a brake circuit fails, the vehicle can
still be braked using the other brake
circuit. However, braking effect is
achieved only when the brake pedal
is depressed firmly. Considerably
more force is needed for this. The
braking distance is extended. Seek
the assistance of a workshop before
continuing the journey.
When the engine is not running, the
support of the brake servo unit
disappears once the brake pedal has been depressed once or twice.
Braking effect is not reduced, but
braking requires significantly greater
force. It is especially important to bear this in mind when being towed.
Control indicator m 3 95.
Antilock brake system
Antilock brake system (ABS)
prevents the wheels from locking.ABS starts to regulate brake pressure as soon as a wheel shows a tendency to lock. The vehicle remains
steerable, even during hard braking.
ABS control is made apparent
through a pulse in the brake pedal
and the noise of the regulation
process.
For optimum braking, keep the brake
pedal fully depressed throughout the
braking process, despite the fact that
the pedal is pulsating. Do not reduce
the pressure on the pedal.
After starting off, the system performs
a self-test which may be audible.
Control indicator u 3 95.
Adaptive brake light
During full braking, all three brake
lights flash for the duration of ABS
control.
152Driving and operatingDynamic braking when vehicle is
moving
When the vehicle is moving and the
switch m is kept pulled, the electric
parking brake system will decelerate the vehicle, but will not apply
statically.
As soon as the switch m is released,
dynamic braking will be stopped.
Automatic operation
Automatic operation includes
automatic application and automatic
release of the electric parking brake.
The electric parking brake can also be
applied or released manually by using
the switch m.
Automatic application: ● The electric parking brake is automatically applied when the
vehicle is stationary and the
ignition is switched off.
● j illuminates in the instrument
cluster and a display message
pops up to confirm the
application.Automatic release:
● Parking brake releases automatically after moving off.
● j extinguishes in the instrument
cluster and a display message
pops up to confirm the release.
If the vehicle is equipped with an
automatic transmission and the brake
is not released automatically, make
sure the front doors are correctly
closed.Deactivation of automatic operation 1. Start the engine.
2. If the parking brake is released, apply the parking brake pulling the
switch m.
3. Take your foot off the brake pedal.
4. Press the switch m for at least 10
seconds and maximum 15 seconds.
5. Release the switch m.
6. Press and hold the brake pedal.
7. Pull the switch m for 2 seconds.
The deactivation of the automatic
operation of the electric parking brake
is confirmed by o illuminating in theinstrument cluster 3 95. The electric
parking brake can only be applied and released manually.
To reactivate the automatic
operation, repeat the steps described above.
Functionality check
When the vehicle is not moving, the
electric parking brake might be
applied automatically. This is done to
check the system.
Fault
Failure mode of electric parking brake
is indicated by a control indicator j
and by a vehicle message which is
displayed in the Driver Information Centre. Vehicle messages 3 103.
Apply electric parking brake: pull and hold the switch m for more than
five seconds. If control indicator m
illuminates, electric parking brake is
applied.
Release electric parking brake: push
and hold the switch m for more than
two seconds. If control indicator m
extinguishes, electric parking brake is
released.
Driving and operating153Control indicator m flashes: electric
parking brake is not fully applied or
released. When continuously
flashing, release electric parking
brake and retry applying.
Brake assist If brake pedal is depressed quickly
and forcefully, maximum brake force
is automatically applied.
Operation of brake assist might
become apparent by a pulse in the
brake pedal and a greater resistance
when depressing the brake pedal.
Maintain steady pressure on the
brake pedal as long as full braking is
required. Maximum brake force is
automatically reduced when brake
pedal is released.
Hill start assist The system helps prevent unintended
movement when driving away on
inclines.When releasing the brake pedal after
stopping on an incline, brakes remain on for further two seconds. The
brakes release automatically as soon
as the vehicle begins to accelerate.Ride control systems
Electronic Stability Control
and Traction Control system
Electronic Stability Control improves
driving stability when necessary,
regardless of the type of road surface
or tyre grip.
As soon as the vehicle starts to
swerve (understeer/oversteer),
engine output is reduced and the
wheels are braked individually.
Electronic Stability Control operates
in combination with the Traction
Control system. It prevents the driven
wheels from spinning.
The Traction Control system is a
component of the Electronic Stability
Control.
Traction Control improves driving
stability when necessary, regardless
of the type of road surface or tyre grip, by preventing the driven wheels from
spinning.
As soon as the driven wheels starts to spin, engine output is reduced and
the wheel spinning the most is braked
164Driving and operatingdecrease the speed. Short press
changes speed in small steps, long
press in large steps.
The speed value is indicated in the
Driver Information Centre.
When the cruise control is operating,
Stop & Start is automatically
deactivated.
Adopting speed by the traffic sign assistant
The intelligent speed adaptation
informs the driver when a speed limit
is detected by the traffic sign
assistant. The detected speed limit
can be used as new value for the
cruise control.
Using a camera at the top of the
windscreen, this system detects and
reads speed limit and end of speed
limit signs. The system also takes
account of information on speed limits from of the map data of the navigationsystem.
The function can be deactivated or
activated in the personalisation
menu, 3 104.
If the cruise control is active, the
recognised speed limit will be
displayed in the Driver Information
Centre and MEM illuminates.
The information displayed in the
Driver Information Centre depends on
the display used.
In the Driver Information Centre,
speed limit sign is shown in the
display and MEM illuminates for a few
seconds.
Press MEM on the steering wheel to
request saving of the suggested
speed.
Press MEM on the steering wheel
once more to confirm and save the
new speed setting.This speed is the new value for the
cruise control.
Exceeding the set speed
It is always possible to drive faster
than the selected set speed by
depressing the accelerator pedal.
When the accelerator pedal is
released, the vehicle returns to the
desired distance if a slower vehicle is
ahead. Otherwise it returns to the
stored speed.
Once the system is activated,
adaptive cruise control decelerates or
brakes if it detects a vehicle ahead,
which is slower or closer than the
desired following distance.
If the programmed speed setting is
exceeded, the display of the speed
setting disappears and a message
"Cruise control suspended" is
displayed until the accelerator pedal
is released.
Driving and operating1659Warning
Accelerating by the driver
deactivates automatic braking by
the system. This is indicated as a
pop-up warning in the Driver
Information Centre.
Full speed range adaptive cruise
control on vehicles with automatic transmission
Full speed range adaptive cruise
control will maintain a following
distance behind a detected vehicle
and slow your vehicle to a stop behind that vehicle.
In case of a brief stop of the vehicle
ahead the adaptive cruise control will
drive off automatically without driver
action. If necessary, press RES/+ or
the accelerator pedal to resume
adaptive cruise control.
If the stopped vehicle ahead was
stopped for a longer time and then
begins to move forward, the green
illuminated vehicle ahead control
indicator A will flash and a warning
chime will sound as a reminder to
check traffic before resuming.
When the vehicle ahead drives away,
press RES+ or the accelerator pedal
to resume adaptive cruise control. If
stopped for more than five minutes or
if the driver's door is opened and the
driver's seat belt is unbuckled, the electric parking brake is applied
automatically to hold the vehicle.
Control indicator m will illuminate. To
release electric parking brake, press
the accelerator pedal. Electric parking
brake 3 151.9 Warning
When full speed range adaptive
cruise control is deactivated or
cancelled, the vehicle will no
longer be held at a stop and can
start to move. Always be prepared to manually apply the brake to hold the vehicle stationary.
Do not leave the vehicle while it is being held at a stop by the full
speed range adaptive cruise
control. Always move selector
lever to park position P and switch
off the ignition before leaving the
vehicle.
Setting the following distance
When adaptive cruise control detects
a slower moving vehicle in the driving path, it will adjust the vehicle speed tomaintain the following distance
selected by the driver.
The following distance can be set to
close (1 dash), normal (2 dashes) or
distant (3 dashes).
If the engine is running and the
adaptive cruise control is selected
(grey), you can modify the following
distance setting:
Press Ö, the current setting is shown
in the Driver Information Centre.
Press Ö again to change the following
distance. The setting is also
displayed in the Driver Information
Centre.
The selected following distance is
indicated by filled distance bars in the
adaptive cruise control page.
178Driving and operatingThe driver must control acceleration,
braking and gear shifting, while
steering is done automatically. The driver can take control at any time by
gripping the steering wheel.
It may be necessary to move forwards and backwards more than once.
Instructions are given in the Info-
Display 3 101.
Advanced parking assist can only be activated when driving forwards.
Advanced parking assist is always
combined with front-rear parking assist.
The system has six ultrasonic parking
sensors each in both the rear and
front bumper.
Entry into a parallel parking slot
Activation
Slow down the vehicle speed below
12 mph.
7'' Colour-Info-Display: to search for a
parking slot, activate the system by
selecting Park Assist on the
homepage of the touch screen. Then
select Enter parallel parking space .
8'' Colour-Info-Display: to search for a parking slot, activate the system by
pressing Í. Select Driving functions
on the touch screen and then Park
Assist . Select Enter parallel parking
space .
Select parking side by switching on
turn signal indicator on the respective
side.
The allowed parallel distance
between the vehicle and a row of
parked cars is between 0.5 metres
and 1.5 metres.The system will not identify slots that
are clearly smaller or larger than the
vehicle.
When a free slot is detected, a visual
feedback on the Colour-Info-Display and a first acoustic signal is given.Drive slowly forwards. When the
second acoustic signal is given, stop
the vehicle, select reverse gear,
release the steering wheel and start
moving slowly. A visual feedback is
given in the Colour-Info-Display.
Driving and operating179
Move forwards and backwards while
observing the warnings of the Parking
assist until the end of manoeuvre is
indicated.
Entry into a perpendicular parking
slot
Activation
7'' Colour-Info-Display: to search for a parking slot, activate the system by
selecting Park Assist on the
homepage of the touch screen. Then
select Enter perpendicular parking
space .
8'' Colour-Info-Display: when search
for a parking slot, activate the system
by pressing Í. Select Driving
functions on the touch screen and
then Park Assist . Select Enter bay
parking space .
Slow down the vehicle speed below
12 mph.
Select parking side by switching on
turn signal indicator on the respective
side.
The allowed parallel distance
between the vehicle and a row of
parked cars is between 0.5 metres
and 1.5 metres.
When several successive slots are
found, the vehicle will be directed towards the last one.
When a free slot is detected, a visual
feedback on the Colour-Info-Display
and an acoustic signal is given. Stop
the vehicle, select reverse gear,
release the steering wheel and start
moving without exceeding 4 mph.