178Driving and operating
Driver's attention■ Use adaptive cruise control carefully on bends or mountain
roads, as it can lose the vehicle
ahead and need 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 suppresses completely
the visibility. 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 or
stopped vehicles.
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
entering 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 on
the driving path or not. Adaptive
cruise control may not be able to
Driving and operating179
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 press 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.
Radar 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,
180Driving and operatingconsult a workshop to verify and
correct the adaptive cruise control sensor position.
Settings
Settings can be changed in the
vehicle personalisation menu in the
Colour-Info-Display.
Select the relevant setting in Settings,
I Vehicle in the Colour-Info-Display.
Colour-Info-Display 3 113.
Vehicle personalisation 3 117.
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 3 115.
Forward collision alert
The forward collision alert can help to
avoid or reduce the harm caused by
front-end crashes. If a vehicle directly
ahead is approached too quickly, a
warning chime and alert in the Driver
Information Centre is provided.
The green illuminated vehicle ahead
symbol A appears in the instrument
cluster when the system has detected
a vehicle in the driving path. A
precondition is that forward collision
alert is activated in the vehicle
personalisation menu 3 117 or that it
is not deactivated by the button V
(depending on the system, see
below).
Depending 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 3 172.
■ Forward collision alert based on
front camera system
on vehicles with no cruise control or
traditional cruise control only
3 170.
Driving and operating181
Forward collision alert based onradar systemThe 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
3 117.
Selecting the alert sensitivity
The alert sensitivity can be set to
near, medium or far.
Press button E, the current setting is
shown in the Driver Information
Centre. Press button E again to
change the alert sensitivity. The
setting is also displayed in the Driver
Information Centre.Note that the alert timing sensitivity
setting is shared with the following
distance setting of the adaptive cruise control 3 172. So changing the alert
timing sensitivity changes the
adaptive cruise control following
distance setting.
Alerting the driver
184Driving and operating
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 following
distance setting instead 3 172.
Active Emergency Braking Active emergency braking can help to reduce the damage 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 3 180.
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
3 117.The system includes:
■ Brake preparation system
■ Emergency automatic braking
■ Forward looking brake assist9 Warning
This system is not intended to
replace the driver responsibility for driving the vehicle and looking
ahead. Its function is limited to
supplemental use only. The driver must continue to apply the brake
pedal as the driving situation
dictates.
Brake preparation system
When approaching a vehicle ahead
so quickly that a collision is likely, the brake preparation system slightly
pressurises the brakes. This reduces
the response time, when a manual or automatic braking is requested.
The brake system is prepared so that braking can occur more rapidly.
Emergency automatic braking
After the brake preparation and just
before the imminent collision, this
function automatically applies limited
braking to reduce the impact speed of
the collision.
Forward looking brake assist
In addition to the brake preparation
system and emergency automatic
braking, the forward looking brake
assist function makes the brake assist more sensitive. Therefore,
depressing the brake pedal slightly
results in immediate hard braking.
This function helps the driver brake
quicker and harder before the
imminent collision.9 Warning
Active emergency braking is not
designed to apply hard
autonomous braking or to
automatically avoid a collision. It is designed to reduce the vehicle
speed before a collision. It may not
react for stopped vehicles,
238Vehicle care
No.Circuit17–18–19Side obstacle detector20Side obstacle detector, venti‐
lated front seats21Active damping system, High
beam assist, Cruise control,
Traffic sign assistant, Lane
departure warning, trailer
module22Anti-theft alarm system23All-wheel drive, anti-theft alarm
system24–25–26–27–28–No.Circuit29Trailer module, transportation
fuse30Side obstacle detector31–32–33–34Sunroof35–36–37–Vehicle tools
Tools
Vehicles with tyre repair kit
The tools and the towing eye are
located together with the tyre repair
kit in a tool box below the floor cover
in the load compartment.
314IndexAAccessories and vehicle modifications .......................... 212
Active Emergency Braking .........184
Active head restraints ...................45
Adaptive cruise control .......105, 172
Adaptive forward lighting ...105, 124
Adjustable air vents ...................144
Airbag and belt tensioners .........100
Airbag deactivation ..............59, 100
Airbag system .............................. 57
Air conditioning regular operation ................................ 146
Air conditioning system .............. 133
Air intake .................................... 145
Air vents...................................... 144
All-wheel drive ........................... 162
Antilock brake system ................ 162
Antilock brake system (ABS) .....102
Anti-theft alarm system ................33
Anti-theft locking system .............. 32
Appearance care ........................257
Apply footbrake .......................... 104
Armrest ................................... 52, 53
Armrest storage ........................... 67
Ashtrays ....................................... 89 Automatic anti-dazzle ..................38
Automatic climate control system .................................... 135Automatic dimming ......................37
Automatic light control ...............122
Automatic locking ........................26
Automatic transmission .............156
Autostop ..................................... 104
Auxiliary heater ........................... 144
B Battery discharge protection ......131
Battery voltage ........................... 117
Belts.............................................. 53
Bonnet ....................................... 214
Brake and clutch fluid .................261
Brake and clutch system ...........101
Brake assist ............................... 164
Brake fluid .................................. 217
Brakes ............................... 162, 217
Breakdown.................................. 253
Bulb replacement ....................... 221
C Capacities .................................. 287
Cargo management system ........72
Car Pass ...................................... 19
Catalytic converter .....................156
Central locking system ................22
Centre console lighting ..............130
Changing tyre and wheel size ...243
Charging system ........................ 100
Child locks ................................... 27
315
Child restraint installationlocations ................................... 62
Child restraints.............................. 61
Child restraint systems ................61
Cigarette lighter ........................... 88
Climate control ............................. 15
Climate control systems .............133
Clock............................................. 86
Colour-Info-Display .....................113
Control indicators.......................... 99
Control of the vehicle .................147
Controls ........................................ 81
Convex shape .............................. 36
Coolant and antifreeze ...............261
Cruise control ....................105, 170
Cupholders .................................. 66
Curtain airbag system .................. 59
Curve lighting.............................. 124
D Danger, Warnings and Cautions ...4
Daytime running lights ...............124
Declaration of conformity ............311
Diesel fuel system bleeding .......220
Diesel particle filter .............103, 155
Door open .................................. 106
Doors ............................................ 28
Driver assistance systems ..........170
Driver Information Centre ...........106Driving characteristics and
towing tips .............................. 208
Driving hints ................................ 147
Dual automatic climate control system ..................................... 139
E Electric adjustment ......................36
Electrical system......................... 232
Electric parking brake .................101
Electric parking brake fault .........101
Electronic driving programmes ..159
Electronic key system ...................21
Electronic Stability Control.......... 166
Electronic Stability Control and Traction Control system ..........103
Electronic Stability Control off..... 103
End-of-life vehicle recovery .......213
Engine compartment fuse box ...233
Engine coolant ........................... 216
Engine coolant temperature gauge ....................................... 97
Engine data ............................... 268
Engine exhaust .......................... 155
Engine identification ...................264
Engine oil ................... 214, 261, 265
Engine oil pressure ....................104
Entry lighting .............................. 130
Event data recorders ..................311
Exit lighting ................................ 131Exterior care .............................. 257
Exterior light ............................... 104
Exterior lighting ....................12, 121
Exterior mirrors ............................. 36
F
Fault ........................................... 159
First aid ......................................... 78
First aid kit ................................... 78
Fixed air vents ........................... 145
Fog light ..................................... 105
Fog lights ................................... 226
Folding mirrors ............................. 36
Following distance ......................102
Following distance indication ......183
Forward collision alert................. 180
Front airbag system .....................57
Front fog lights ........................... 127
Front seats.................................... 46
Front storage ................................ 67
Front turn signal light ..................222
Fuel............................................. 201
Fuel consumption - CO 2-
Emissions ............................... 207
Fuel for diesel engines ..............202
Fuel for liquid gas operation .......202
Fuel for petrol engines ...............201
Fuel gauge ................................... 96
Fuel selector ................................ 97
Fuses ......................................... 232