18In briefStarting off
Check before starting off ● Tyre pressure 3 255 and
condition 3 293.
● Engine oil level and fluid levels 3 232.
● All windows, mirrors, exterior lighting and number plates are
free from dirt, snow and ice and
are operational.
● Proper position of mirrors 3 38,
seats 3 48 and seat belts
3 58.
● Brake function at low speed, particularly if the brakes are wet.Starting the engine
Ignition switch
● Turn key to position 2.
● Move the steering wheel slightly to release the steering wheel
lock.
● Manual transmission: operate clutch and brake pedal.
Automatic transmission: operate
brake pedal and move selector
lever to P or N.
● Do not operate accelerator pedal.
● Diesel engines: wait until control
indicator ! for preheating
extinguishes.
● Turn key to position 3 and
release after engine has been
started.
Starting the engine 3 155.
To turn the key back from position 2
to 1 or 0, first push the key all the way
in towards the steering column.
Driving and operating151Driving and
operatingDriving hints ............................... 152
Control of the vehicle ...............152
Steering ................................... 152
Starting and operating ...............152
New vehicle running-in ............152
Ignition switch positions ...........152
Power button ........................... 153
Retained power off ..................155
Starting the engine ..................155
Overrun cut-off ........................ 157
Stop-start system ....................157
Parking .................................... 159
Engine exhaust .......................... 160
Exhaust filter ............................ 160
Catalytic converter ...................162
AdBlue ..................................... 162
Automatic transmission ..............165
Transmission display ...............165
Gear selection ......................... 165
Manual mode ........................... 166
Electronic driving programmes 167
Fault ........................................ 168
Interruption of power supply ....168Manual transmission ..................169
Drive systems ............................ 170
All-wheel drive ......................... 170
Brakes ........................................ 170
Antilock brake system .............170
Parking brake .......................... 171
Brake assist ............................. 173
Hill start assist ......................... 173
Ride control systems .................174
Traction Control system ..........174
Electronic Stability Control ......175
Interactive driving system ........176
Driver assistance systems .........178
Cruise control .......................... 178
Speed limiter ........................... 180
Adaptive cruise control ............181
Forward collision alert .............190
Following distance indication ...193
Active emergency braking .......194
Front pedestrian protection .....197
Parking assist .......................... 199
Side blind spot alert .................206
Lane change alert ....................207
Panoramic view system ...........209
Rear view camera ...................211
Rear cross traffic alert .............213
Traffic sign assistant ................214
Lane keep assist .....................218Fuel............................................ 221
Fuel for petrol engines .............221
Fuel for diesel engines ............222
Refuelling ................................ 223
Trailer hitch ................................ 225
General information .................225
Driving characteristics and towing tips .............................. 225
Trailer towing ........................... 225
Towing equipment ...................226
Trailer stability assist ...............228
170Driving and operatingDrive systems
All-wheel drive
The All-wheel drive system enhances
driving characteristics and stability,
and helps to achieve the best
possible driveability regardless of
ground surface. The system is always
active and cannot be deactivated.
The torque is distributed steplessly
between the wheels of the front and
rear axle up to a torque split of 50%
to 50%. Depending on the driving
conditions, i.e. steady state driving,
All wheel drive system transfers a
minimum amount of torque for fuel
efficiency. Additionally the torque
vectoring between the rear wheels is
distributed depending on the vehicle
dynamic and surface.
This is possible because the All wheel drive system operates with two
clutches, one on each side.
For optimum system performance,
the vehicle's tyres should not have
varying degrees of wear.If a service message is displayed in
the Driver Information Centre, the
system may have limited functionality
(or be completely disabled in some
cases, i.e. the vehicle switches to
Front-wheel drive). Seek the
assistance of a workshop.
Towing the vehicle 3 271.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 R 3 107.
Active emergency braking 3 194.
Antilock brake system Antilock brake system (ABS)
prevents the wheels from locking.
Driving and operating173Fault
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 3 122.
Control 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 preventing
unintended movement when driving
away on inclines.
When releasing the brake pedal after
stopping on an incline, brakes remain
on for further 2 seconds. The brakes
release automatically as soon as the
vehicle begins to accelerate. The hill
start assist will not activate if one of
the following conditions occurs:
● forward gear is engaged when facing downhill
● reverse gear is engaged when facing uphill
● driver seat belt is unfastened
● driver's door is open
Extended hill start assist
This function holds the vehicle
stationary for up to 5 minutes after the brake pedal is released.
The electric parking brake will be
automatically activated to prevent
vehicle movement when one of the
following conditions occurs:● extended hill start assist is deactivated after 5 minutes
● ignition is switched off
● driver's exit is detected
Hill start assist or extended hill start
assist can be selected in the vehicle
personalisation 3 123.
Note
Automatic transmission only: hill
start assist and extended hill start
assist will not be activated in neutral
gear. If neutral gear is selected
during an active hold, assists will
deactivate and vehicle may start
moving.
Driving and operating183Accelerate to the desired speed and
move thumb wheel to SET/-, the
current speed is stored and
maintained.
The adaptive cruise control symbol
C , the following distance setting and
set speed are indicated in the Driver
Information Centre.
The accelerator pedal can be
released. Adaptive cruise control
remains activated during gear
shifting.
Overriding 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.9 Warning
Accelerating by the driver
deactivates automatic braking by
the system. This is indicated as a
pop-up warning in the Driver
Information Centre or by the
adaptive cruise control symbol
turning blue.
Indication on Driver Assistance page
As long as the set speed is
overridden, the bars in front of the
vehicle symbol appear blue.
Increase or reduce speed The preset speed can be changed by
moving thumb wheel to RES/+ to
increase or SET/- to decrease the
speed. Move thumb wheel repeatedly to change speed in small steps, move
and hold to change speed in large
steps.
Resume stored speed
If the system is switched on but
inactive and a speed was stored
before, turn thumb wheel to RES/+ at
a speed above 5 km/h (with automatic
transmission) or above 30 km/h (with
manual transmission) to resume the stored speed.
186Driving and operatingDetecting the vehicle ahead
The green illuminated vehicle ahead
control indicator A is displayed when
the system detects a vehicle in the driving path. The range of the sensors
is between 25 and 150 m depending
on vehicle speed.
Forward collision alert 3 190.
If this symbol does not display, or
displays briefly, adaptive cruise
control will not respond to vehicles
ahead.
Indication on Driver Assistance page
If the system is active and a preceding vehicle is detected, the bars in front of the vehicle symbol appear green and
indicate set gap position.
Deactivation of the functionality
Adaptive cruise control is deactivated by the driver when:
● y is pressed.
● Brake pedal is applied.
● Clutch pedal is depressed for more than 4 seconds.
● Selector lever of automatic transmission is moved to N.
The system is also automatically
deactivated when:
● Vehicle speed accelerates above
190 km/h or slows down below
25 km/h . Vehicles with automatic
transmission slows down to a stop without deactivating within
5 minutes.
● The Traction Control system is deactivated or operating.
● The Electronic Stability Control is
deactivated or operating.
● There is no traffic and nothing detected on the road sides forapprox. 1 minute. In this case
there are no radar echoes and
the sensor may report that it is
blocked.
● The active emergency braking system is applying the brakes.
● Driving on steep inclines.
● The radar sensor is blocked by an ice or water film.
● A fault is detected in the radar, camera, engine or brake system.
● The brakes need to cool down.
190Driving and operatingaccident, consult a workshop to
verify and adjust the radar unit
position.
Settings
A vehicle message and chime
reminds the driver to drive off when
the adaptive cruise control holds the vehicle at standstill. This function
named Go Notifier can be activated
and deactivated in the vehicle
personalisation menu in the Info
Display.
Vehicle personalisation 3 123.
Fault
If the adaptive cruise control does not
work due to temporary conditions
(e.g. blockage by ice, overheated
brakes or low speed manoeuvres) or if there is a permanent system error,
a message is displayed in the Driver
Information Centre.
Vehicle messages 3 122.
Forward collision alert
The forward collision alert is part of
the forward collision system 3 123. It
can help to avoid or reduce the harm
caused by front-end crashes.
A vehicle ahead is indicated by the
control indicator A.
Additionally, the status of the forward
collision alert is indicated on the
Driver Assistance page in the Driver
Information Center 3 111.
If the vehicle is equipped with
conventional cruise control, the
forward collision alert uses the front
camera in the windscreen to detect a
vehicle directly ahead, in your path.
If the vehicle is equipped with
adaptive cruise control, the forward
collision alert uses the radar sensor
and front camera to detect a vehicle
directly ahead, in your path.
Forward collision alert with front
camera detects vehicles to distances
of approx. 60 m and operates
automatically at all speeds above
walking speed.Forward collision alert with radar
sensor detects vehicles to distances
of approx. 150 m and operates
automatically at all speeds above
walking speed.
Activation
A precondition is that forward collision
alert in the vehicle personalisation
menu is not deactivated 3 123.
Alerting the driver The vehicle ahead control indicator
A illuminates green in the instrument
cluster when the system has detected
a vehicle in the driving path. On
vehicles with head-up display, A is
projected on the windscreen.
The control indicator A changes to
amber when the distance to a
preceding moving vehicle gets too
small.Caution
The colour lighting of this control
indicator does not correspond to
local traffic laws on following
Driving and operating193General information9Warning
Forward collision alert is just a
warning system and does not
apply the brakes. When
approaching a vehicle ahead too
rapidly, it may not provide you
enough time to avoid a collision.
The driver accepts full
responsibility for the appropriate
following distance based on traffic, weather and visibility conditions.
The complete attention of the
driver is always required while
driving. The driver must always be
ready to take action and apply the
brakes.
System limitations
Forward collision alert is designed to warn on vehicles only, but may reactalso to other objects.
In the following cases, forward
collision alert may not detect a vehicle ahead or sensor performance is
limited:
● driving on winding or hilly roads● during nighttime driving
● weather limits visibility, such as fog, rain, or snow
● the sensor in the windscreen is blocked by snow, ice, slush, mud,dirt, windscreen damage or
affected by foreign items, e.g.
stickers
Following distance
indication
The following distance indication
displays the distance to a preceding
moving vehicle. The front camera in
the windscreen is used to detect the
distance of a vehicle directly ahead in
the vehicle's path. It is active at
speeds above 40 km/h.
When a preceding vehicle is detected
ahead, the distance is indicated in
seconds, displayed on a page in the
Driver Information Centre.On Baselevel display, choose Info
Menu ? and choose following
distance indication page 3 111.
On Mid- and Uplevel display, select
Info menu via steering wheel buttons
and press å to select following
distance indication 3 111.
The minimum indicated distance is 0.5 seconds.
If there is no vehicle ahead or the vehicle ahead is out of range, two
dashes will be displayed: -.- sec.