198Driving and operatinga much slower vehicle or after a lane
change. This is particularly true while
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 considerations9 Warning
Do not use adaptive cruise control
on steep hill roads.
System performance on hills 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. Full speed range
adaptive control is deactivated
automatically, as the vehicle is
stopping uphill on an incline greater than 10%. In this condition, be
prepared to take control of the
vehicle.
Note that applying the brake
deactivates the system.
Radar unit
The radar unit is mounted behind the
radiator grille behind or below the
brand emblem.
9 Warning
The radar unit was aligned
carefully during manufacture.
Therefore, in the event of a front-
end impact, 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
Driving and operating199accident, consult a workshop to
verify and adjust the radar unit
position.
Settings
Settings can be changed in the
vehicle personalisation menu in the
Info-Display.
Select the relevant setting in Settings,
I Vehicle in the Info-Display.
Info-Display 3 120.
Vehicle personalisation 3 126.
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 3 124.
Forward collision alert The forward collision alert may help toavoid or reduce the harm caused by
front-end crashes.
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.
A vehicle ahead is indicated by the
control indicator A.
If a vehicle directly ahead is
approached too quickly, a warning
chime and alert in the Driver
Information Centre is provided.
Additionally the driver gets notified by
a flashing red LED stripe or a pop up
symbol in the head-up display which
is projected on the windscreen in the
driver's field of view.
A precondition is that forward collision
alert in the vehicle personalisation
menu is not deactivated 3 126.
Activation
Forward collision alert with front
camera detects vehicles to distances
of approximately 60 metres and
operates automatically at all speeds
above walking speed.
Forward collision alert with radar
sensor detects vehicles to distances
of approximately 150 metres and
operates automatically at all speeds
above walking speed.
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
yellow when the distance to a
preceding moving vehicle gets too
small.
Driving and operating201
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.
Deactivation The system can be deactivated in the
personalisation menu, 3 126.
If the forward collision alert was
deactivated, alert sensitivity is set to
"medium" when ignition is switched on next time.
The last selected setting will be stored
when the ignition is switched off.
General information9 Warning
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 and the Radar sensor
are used to detect the distance of a
vehicle directly ahead in the vehicle's path. It is active at speeds above
25 mph.
202Driving and operatingWhen 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 ? via MENU on the turn
signal lever and turn the adjuster
wheel to choose following distance
indication page, 3 113
On Mid- and Uplevel display, select
Info menu via steering wheel buttons
and press å to select following
distance indication 3 113.
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.
If Adaptive cruise control is active,
this page shows the alert sensitivity
setting instead of following distance setting. 3 191.
System limitations In the following cases, following
distance indication sensor
performance is limited:
● Driving on winding or hilly roads.● During nighttime driving.
● Weather limits visibility, such as fog, rain, or snow.
● The sensor is blocked by snow, ice, slush, mud, dirt, windscreen
damage or affected by foreign
items, e.g. stickers.
Active emergency braking Active emergency braking can help toreduce the damage and injury from
crashes with vehicles, pedestrians 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 3 199 or the Front pedestrian
protection alert 3 205.
The feature uses various inputs (e.g.
camera sensor, radar sensor, brake
pressure, vehicle speed) to calculate
the probability of a frontal collision.
206Driving and operatingFront pedestrian protection can be
set to Off, Alert, or Alert & Brake in
vehicle personalisation 3 126.9 Danger
Front pedestrian braking does not
provide an alert or automatically
brake the vehicle, unless it detects
a pedestrian.
The system may not detect
pedestrians, including children,
when the pedestrian is not directly ahead, not fully visible, not
standing upright, or when part of a
group.
Front pedestrian protection includes:
● detecting front pedestrian ahead● front pedestrian alert
● automatic braking
Detecting front pedestrian ahead
A pedestrian ahead up to a distance
of approximately 40 m is indicated by the control indicator 7 in the
instrument cluster. On vehicles with
head-up display, 7 is projected on the
windscreen.
Front pedestrian alert
When approaching a detected
pedestrian too quickly, a red flashing
LED alert or the pop-up symbol 7 in
the head-up display is projected on the windscreen in the driver's field of
view. A warning chime is provided.
The brake system may prepare for
driver braking to occur more rapidly
which can cause a brief, mild
deceleration. Continue to apply the
brake pedal as required.
Cruise control or Adaptive cruise
control may be disengaged when the
Front pedestrian alert occurs.
Automatic braking If a crash into a pedestrian directly
ahead is imminent, and the brakes
have not been applied, Automatic
braking may automatically brake
moderately or brake hard. This can
help to avoid some very low speed
pedestrian crashes or reduce
pedestrian injury.
Automatic braking levels may be reduced under certain conditions,
such as higher speeds.
320IndexAAccessories and vehicle modifications .......................... 238
Active bonnet ................................ 70
Active emergency braking ..........202
Adaptive cruise control .......112, 191
AdBlue ................................ 110, 171
Adjustable air vents ...................158
Airbag and belt tensioners .........107
Airbag deactivation ..............62, 107
Airbag label................................... 57
Airbag system .............................. 57
Air conditioning regular operation ................................ 160
Air conditioning system .............. 149
Air intake .................................... 159
Air vents...................................... 158
All-wheel drive ........................... 179
Antilock brake system ................ 179
Antilock brake system (ABS) .....109
Anti-theft alarm system ................33
Anti-theft locking system .............. 33
Appearance care ........................280
Armrest ................................... 52, 54
Armrest storage ........................... 73
Ashtrays ....................................... 96 Automatic anti-dazzle ..................38
Automatic dimming ......................37
Automatic light control ...............136
Automatic locking ........................26Automatic transmission .............174
Autostop ..................................... 166
Auxiliary heater ........................... 158
B Baselevel display ........................113
Battery discharge protection ......147
Battery voltage ........................... 125
Belts.............................................. 55 BlueInjection ............................... 171
Bonnet ....................................... 240
Brake and clutch fluid .................285
Brake and clutch system ...........108
Brake assist ............................... 181
Brake fluid .................................. 243
Brakes ............................... 179, 243
Breakdown.................................. 278
Bulb replacement ....................... 246
C Capacities .................................. 302
Cargo management system ........80
Catalytic converter .....................170
Central locking system ................24
Centre console lighting ..............146
Centre console storage ...............73
Changing tyre and wheel size ...267
Charging system ........................ 108
Child locks ................................... 27
Child restraint installation locations ................................... 66
321Child restraints.............................. 63
Child restraint systems ................63
Climate control ............................. 15
Clock............................................. 92
Collision damage repair ..............313
Control indicators........................ 106
Control of the vehicle .................162
Controls ........................................ 88
Convex shape .............................. 36
Coolant and antifreeze ...............285
Cruise control ....................112, 188
Cupholders .................................. 72
Curtain airbag system .................. 61
Curve lighting.............................. 139
D Danger, Warnings and Cautions ...4
Daytime running lights ...............139
Declaration of conformity ............309
DEF ............................................ 171
Diesel exhaust fluid ....................171
Diesel fuel system bleeding .......245
Diesel particle filter ....................169
Door open .................................. 112
Doors ............................................ 27
Driver assistance systems ..........188
Driver Information Centre ...........113
Driving characteristics and towing tips .............................. 234
Driving hints ................................ 162E
Electric adjustment ......................36
Electrical system......................... 256
Electric parking brake .........108, 180
Electric parking brake fault .........108
Electronic climate control system 152
Electronic key system ...................21
Electronic Stability Control.......... 184
Electronic Stability Control and Traction Control system ..........109
Electronic Stability Control off..... 109
End-of-life vehicle recovery .......239
Engine compartment fuse box ...257
Engine coolant ........................... 242
Engine coolant temperature ......110
Engine coolant temperature gauge ..................................... 105
Engine data ............................... 293
Engine exhaust .......................... 169
Engine identification ...................289
Engine oil ................... 241, 285, 290
Engine oil pressure ....................110
Entry lighting .............................. 146
Event data recorders ..................316
Exit lighting ................................ 146
Exterior care .............................. 280
Exterior light ............................... 111
Exterior lighting ....................12, 135
Exterior mirrors ............................. 36F
First aid kit ................................... 83
Fixed air vents ........................... 159
Fog light ..................................... 111
Fog lights ................................... 248
Folding mirrors ............................. 36
Following distance ......................109
Following distance indication ......201
Forward collision alert................. 199
Front airbag system .....................60
Front fog lights ........................... 143
Front pedestrian protection ........205
Front seats.................................... 46
Front storage ................................ 73
Fuel............................................. 230
Fuel for diesel engines ..............231
Fuel for petrol engines ...............230
Fuel gauge ................................. 104
Funnel......................................... 232
Fuses ......................................... 256
G Gauges ....................................... 102
Gear shifting ............................... 109
General information ...................234
Glovebox ..................................... 72
H Halogen headlights ....................246
Hand brake ................................. 179
Hazard warning flashers ............142