Driving and operating179Switching off
Press C to switch off adaptive cruise
control. The control indicator m and
C in the Driver Information Centre
extinguish. The stored speed is
deleted.
Switching off the ignition also
switches off adaptive cruise control
and deletes the stored speed.
Driver's attention ● Use adaptive cruise control carefully on bends or mountain
roads, as it can lose the vehicle
ahead and require time to detect
it again.
● Do not use the system on slippery roads as it can create
rapid changes in tyre traction
(wheel spinning), so that you
could lose control of the vehicle.
● Do not use adaptive cruise control during rain, snow or
heavy dirt, as the radar sensor
can be covered by a water film,
dust, ice or snow. This reduces or completely suppresses thevisibility. In case of sensor
blockage, clean the sensor
cover.
System limits ● The system's automatic brake force does not permit hard
braking and the braking level
may not be sufficient to avoid a
collision.
● After a sudden lane change, the system needs a certain time to
detect the next preceding
vehicle. So if a new vehicle is
detected, the system may
accelerate instead of braking.
● Adaptive cruise control does ignore the oncoming traffic.
● Adaptive cruise control does not brake for pedestrians, animals,
very slow speed driving or
stopped vehicles.
● Don't use adaptive cruise control when towing a trailer.Bends
The adaptive cruise control calculates
a predicted path based on the
centrifugal force. This predicted path
considers the current bend
characteristic, but cannot consider a
future bend change. The system may lose the current vehicle ahead or
consider a vehicle which is not in the
actual lane. This can happen when
entering or exiting a bend or if the
bend gets stronger or weaker. If it no
longer detects any vehicle ahead,
then control indicator A will
extinguish.
If the centrifugal force is too high in a bend, the system slows down the vehicle slightly. This braking level is
not designed to avoid spinning off the bend. The driver is responsible for
reducing the selected speed before
180Driving and operatingentering a bend and in general to
adapt the speed to the road type and
to existing speed limits.
Motorways
On motorways, adapt the set speed
to the situation and the weather.
Always consider that adaptive cruise
control has a limited visibility range, a
limited braking level and a certain
reaction time to verify if a vehicle is in
the driving path or not. Adaptive
cruise control may not be able to
brake the vehicle in time to avoid a
collision with a much slower vehicle or after a lane change. This is
particularly true if driving fast or if the
visibility is reduced due to weather
conditions.
While entering or exiting a motorway,
adaptive cruise control may lose the
vehicle ahead and accelerate up to
the set speed. For this reason,
decrease the set speed before the
exit or before the entry.
Vehicle path changes
If another vehicle enters your driving
path, adaptive cruise control will first
consider the vehicle when it is
completely in your path. Be ready to
take action and depress the brake
pedal, if you need to brake more
quickly.
Hill and trailer considerations
System performance on hills and
when towing a trailer depends on
vehicle speed, vehicle load, traffic
conditions and the road gradient. It
may not detect a vehicle in your path
while driving on hills. On steep hills,
you may have to use the accelerator
pedal to maintain your vehicle speed.
When going downhill, especially
when towing a trailer, you may have
to brake to maintain or reduce your
speed.
Note that applying the brake
deactivates the system. It is not
recommended to use adaptive cruise
control on steep hills especially when towing a trailer.
Driving and operating181Radar unit
The radar unit is mounted behind the
radiator grille below the brand
emblem.
9 Warning
The radar unit was aligned
carefully during manufacture.
Therefore, after a frontal accident, do not use the system. The front
bumper may appear to be intact,
however the sensor behind can be
out of position and react
incorrectly. After an accident,
consult a workshop to verify and
correct the adaptive cruise control
sensor position.
Settings
Settings can be changed in the
vehicle personalisation menu in the
Info-Display.
Select the relevant setting in
Settings in the Info-Display.
Info-Display 3 121.
Vehicle personalisation 3 124.
Fault
If the adaptive cruise control does not work due to temporary conditions
(e.g. blockage by ice) or if there is a
permanent system error, then a
message is displayed in the Driver
Information Centre.
Vehicle messages 3 122.
Forward collision alert The forward collision alert can help to
avoid or reduce the damage caused
by front-end crashes.
A vehicle ahead is indicated by a
control indicator A.
If a vehicle directly ahead is
approached too quickly, a warning
chime and alert in the Driver
Information Centre is provided.
A precondition is that forward collision
alert is activated in the vehicle
personalisation menu 3 124 or that it
is not deactivated by pressing V
(depending on the system, see
following).
182Driving and operatingDepending on the vehicle's
equipment, there are two variants of
the forward collision alert available:
● Forward collision alert based on
radar system
on vehicles equipped with
adaptive cruise control 3 175.
● Forward collision alert based on
front camera system
on vehicles with traditional cruise
control 3 172.
Forward collision alert based on
radar system
The system uses the radar sensor
behind the radiator grille to detect a
vehicle directly ahead, in your path,
within a distance of max. 150 metres.
Activation
Forward collision alert operates
automatically above walking speed,
provided that Auto collision
preparation setting is not deactivated
in the vehicle personalisation menu
3 124.Selecting the alert sensitivity
The alert sensitivity can be set to
near, medium or far.
Press E; the current setting is shown
in the Driver Information Centre.
Press E again to change the alert
sensitivity. The setting is also displayed in the top line of the Driver
Information Centre.
Note that the alert timing sensitivity
setting is shared with the following
distance setting of the adaptive cruise control. So changing the alert timing
sensitivity changes the adaptive
cruise control following distance
setting.
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.
Driving and operating185depending on the vehicle equipment,
either the radar behind the radiator
grille or the front camera in the
windscreen to detect the distance of
a vehicle directly ahead in your lane.
It is active at speeds above 25 mph.
When a preceding vehicle is detected
ahead, the distance is indicated in
seconds, displayed on a page in the
Driver Information Centre 3 116.
Press MENU on the turn signal lever
to select Vehicle Information
Menu ? and turn the adjuster
wheel to choose following distance
indication page.
The minimum indicated distance is
0.5 s.
If there is no vehicle ahead or the vehicle ahead is out of range, two
dashes will be displayed: -.- s.
If Adaptive cruise control is active,
this page shows the alert sensitivity
setting instead of following distance setting. 3 175.
Active Emergency Braking
Active emergency braking can help to reduce the damage and injury from
crashes with vehicles and obstacles
directly ahead, when a collision can no longer be avoided either by
manual braking or by steering. Before
the active emergency braking
applies, the driver is warned by the forward collision alert 3 181.
The feature uses various inputs (e.g.
radar sensor, brake pressure, vehicle speed) to calculate the probability of
a frontal collision.
Active emergency braking operates automatically above walking speed,
provided that Auto collision
preparation setting is not deactivated
in the vehicle personalisation menu
3 124.
The system includes: ● brake preparation system
● emergency automatic braking
● forward looking brake assist9Warning
This system is not intended to
replace the driver responsibility of driving the vehicle and looking
ahead. Its function is limited to
supplemental use only. The driver shall continue to apply the brake
pedal as the driving situation
dictates.
230Vehicle careNo.Circuit1Engine control module2Lambda sensor3Fuel injection/Ignition system4Fuel injection/Ignition system5–6Exterior mirror heating/Anti-
theft alarm system7Fan control/Engine control
module/Transmission control
module8Lambda sensor/Engine cooling9Rear window sensor10Battery sensor11Tailgate release12Adaptive forward lighting/Auto‐
matic light control13ABS14Rear window wiper15Engine control moduleNo.Circuit16Starter17Transmission control module18Heated rear window19Front power windows20Rear power windows21Rear electrical centre22Left high beam (Halogen)23–24Right headlight (LED)25Left headlight (LED)26Front fog lights27Diesel fuel heating28Stop-start system29Electric parking brake30ABS31Adaptive cruise control32Airbag
232Vehicle care
In right-hand drive vehicles, the fuse
box is located behind a cover in the
glovebox. Open the glovebox, then
open the cover and fold it down.
No.Circuit1Cruise control/Speed limiter/
Adaptive cruise control/Steering wheel controls2Exterior lights/Body control
module3Exterior lights/Body control
module4Infotainment system5Infotainment system/Instrument6Power outlet/Cigarette lighter7Power outlet8Left low beam/Body control
module9Right low beam/Body control
module/Airbag module10Door locks/Body control module11Interior fan12–13–14Diagnostic connectorNo.Circuit15Airbag16Power outlet17Air conditioning system18Logistics19Body control module20Body control module21Instrument panel cluster/Anti-
theft alarm system22Ignition sensor23Body control module24Body control module25–26–
Load compartment fuse box
The fuse box is on the left side of the
load compartment behind a cover.
282IndexAAccessories and vehicle modifications .......................... 213
Active Emergency Braking .........185
Active head restraints ...................36
Adaptive cruise control .......116, 175
AdBlue ........................ 114, 158, 258
Adjustable air vents ...................147
Airbag and belt tensioners .........110
Airbag deactivation ..............57, 111
Airbag label................................... 53
Airbag system .............................. 53
Air conditioning regular operation ................................ 148
Air conditioning system .............. 142
Air intake .................................... 148
Air vents...................................... 147
Antilock brake system ................ 165
Antilock brake system (ABS) .....112
Anti-theft alarm system ................26
Anti-theft locking system .............. 25
Appearance care ........................253
Armrest ......................................... 41
Armrest storage ........................... 68
Ashtrays ..................................... 102
Automatic anti-dazzle ..................30
Automatic light control ...............132
Automatic locking ........................24
Automatic transmission .............161Autostop..................................... 153
Auxiliary heater ........................... 147
B Battery discharge protection ......140
Battery voltage ........................... 123
Bicycle rack .................................. 69
BlueInjection ............................... 158
Bonnet ....................................... 214
Brake and clutch fluid .................258
Brake and clutch system ...........111
Brake assist ............................... 167
Brake fluid .................................. 218 Brakes ............................... 165, 218
Breakdown.................................. 251
Bulb replacement ....................... 221
C Capacities .................................. 271
Cargo management system ........87
Car Pass ...................................... 20
Catalytic converter .....................157
Central locking system ................22
Centre console lighting ..............139
Centre console storage ...............68
Changing tyre and wheel size ...240
Charging system ........................ 111
Child locks ................................... 24
Child restraint installation locations ................................... 62
Child restraints.............................. 59