Driving and operating191
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 3 121 or that it
is not deactivated by pressing 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 3 183.
● Forward collision alert based on
front camera system
on vehicles with no cruise control or traditional cruise control only
3 180.
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
3 121.
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 Driver Information
Centre.
192Driving and operating
Note that the alert timing sensitivity
setting is shared with the following distance setting of the adaptive cruise control 3 183. So changing the alert
timing sensitivity changes the
adaptive cruise control following
distance setting.
Alerting the driver
A green illuminated vehicle ahead
control indicator A illuminates in the
instrument cluster when the system has detected a vehicle in the driving
path. The control indicator A
changes to yellow when the distance
to a preceding moving vehicle gets
too small or when approaching
another vehicle too rapidly.Caution
The colour lighting of this control
indicator does not correspond to
local traffic laws on following
distance. The driver bears full
responsibility for maintaining safe
following distance according to
applicable traffic rules, weather
and road conditions etc. at all
times.
If a collision is imminent the collision
alert symbol pops-up in the Driver
Information Centre and a warning
chime sounds. Depress the brake
pedal, if it is required by the situation.
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 3 117.
Vehicle personalisation 3 121.
Forward collision alert based on front camera system
Forward collision alert uses the front
camera system in the windscreen to
detect a vehicle directly ahead, in
your path, within a distance of approx.
60 metres.
Activation
Forward collision alert operates
automatically above 25 mph, if it is not deactivated by pressing V, see
below.
Selecting the alert sensitivity
The alert sensitivity can be set to
near, medium or far.
194Driving and operatingIn the following cases, forward
collision alert may not detect a vehicle ahead or sensor performance may be limited:
● on winding roads
● when weather limits visibility, e.g. fog, rain, or snow
● when the sensor is blocked by snow, ice, slush, mud, dirt, or
windscreen damage
Following distance indication
The following distance indication
displays the distance to a preceding
moving vehicle. The system uses,
depending 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 3 110.On Baselevel display set Settings
X with the Menu button and select
Following distance indication via the
adjuster wheel on the turn signal lever
3 110.
On Midlevel or Uplevel display, select
Info menu and press o to select
Following distance indication 3 110.
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: -.- s.
If Adaptive cruise control is active,
this page shows the following
distance setting instead 3 183.
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 3 190.
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
3 121.
The system includes: ● brake preparation system
● emergency automatic braking
● forward looking brake assist
250Vehicle careNo.Circuit1Central locking system/Power
tailgate2Trailer module (type A)
Infotainment system (type B)3–4–5Trailer socket6Heated steering wheel (only
vehicles with load compartment
fuse box)7Selective catalytic reduction
system8Trailer socket9Sunroof10Central locking system/Tailgate
(type A)
Sunroof (type B)11–12Selective catalytic reduction
systemNo.Circuit13–14–15Power tailgate lock16Air conditioning system17Selective catalytic reduction
system18Selective catalytic reduction
system19Side obstacle detector20Side obstacle detector/Venti‐
lated front seats21Active damping system/Cruise
control/Traffic sign assistant/
Lane departure warning/Trailer
module22–23All-wheel drive/Anti-theft alarm
system24–25–
320IndexAAccessories and vehicle modifications .......................... 225
Active emergency braking ..........194
Active head restraints ...................46
Adaptive cruise control .......109, 183
Adaptive forward lighting ...109, 132
AdBlue ................................ 108, 164
Adjustable air vents ...................151
Airbag and belt tensioners .........104
Airbag deactivation ..............62, 104
Airbag label................................... 57 Airbag system .............................. 57
Air conditioning regular operation ................................ 153
Air conditioning system .............. 140
Air intake .................................... 152
Air vents...................................... 151
All-wheel drive ........................... 172
Antilock brake system ................ 172
Antilock brake system (ABS) .....106
Anti-theft alarm system ................34
Anti-theft locking system .............. 33 Appearance care ........................270
Armrest ................................... 52, 53
Armrest storage ........................... 70
Ashtrays ....................................... 92 Automatic anti-dazzle ..................39
Automatic climate control system .................................... 142Automatic dimming ......................38
Automatic light control ...............129
Automatic locking ........................27
Automatic transmission .............167
Automatic transmission fluid .......228
Autostop ..................................... 109
Auxiliary heater ........................... 151
B Battery discharge protection ......139
Battery voltage ........................... 120 Belts.............................................. 54
BlueInjection ............................... 164
Bonnet ....................................... 226
Brake and clutch fluid .................274
Brake and clutch system ...........105
Brake assist ............................... 175
Brake fluid .................................. 231
Brakes ............................... 172, 231
Breakdown.................................. 266
Bulb replacement ....................... 234
C
Capacities .................................. 291
Cargo management system ........75
Car Pass ...................................... 21
Catalytic converter .....................164
Central locking system ................24
Centre console lighting ..............138
Changing tyre and wheel size ...256
Charging system ........................ 104
321Child locks ................................... 28
Child restraint installation locations ................................... 65
Child restraints.............................. 63
Child restraint systems ................63
Climate control ............................. 15
Climate control systems .............140
Clock............................................. 89
Collision damage repair ..............315
Colour-Info-Display .....................117
Control indicators........................ 103
Control of the vehicle .................155
Controls ........................................ 85
Convex shape .............................. 37
Coolant and antifreeze ...............274
Cruise control ....................109, 180
Cupholders .................................. 69
Curtain airbag system .................. 61
Curve lighting.............................. 132
D Danger, Warnings and Cautions ...4
Daytime running lights ...............131
Declaration of conformity ............312
DEF ............................................ 164
Diesel exhaust fluid ....................164
Diesel fuel system bleeding .......233
Diesel particle filter .............107, 163
Door open .................................. 110
Doors ............................................ 29Driver assistance systems..........180
Driver Information Centre ...........110
Driving characteristics and towing tips .............................. 221
Driving hints ................................ 155
Dual automatic climate control system ..................................... 147
E Electric adjustment ......................37
Electrical system......................... 244
Electric parking brake .........105, 173
Electric parking brake fault .........105
Electronic driving programmes ..170
Electronic key system ...................22
Electronic Stability Control.......... 176
Electronic Stability Control and Traction Control system ..........107
Electronic Stability Control off..... 107
End-of-life vehicle recovery .......225
Engine compartment fuse box ...246
Engine coolant ........................... 229
Engine coolant temperature ......107
Engine coolant temperature gauge ..................................... 101
Engine data ............................... 281
Engine exhaust .......................... 163
Engine identification ...................277
Engine oil ................... 227, 274, 278
Engine oil pressure ....................108Entry lighting .............................. 138
Event data recorders ..................317
Exit lighting ................................ 138
Exterior care .............................. 270
Exterior light ............................... 109
Exterior lighting ....................12, 128
Exterior mirrors ............................. 37
F
Fault ........................................... 170
First aid ......................................... 80
First aid kit ................................... 80
Fixed air vents ........................... 152
Fog light ..................................... 109
Fog lights ................................... 239
Folding mirrors ............................. 37
Following distance ......................106
Following distance indication ......194
Forward collision alert................. 190
Front airbag system .....................60
Front fog lights ........................... 135
Front seats.................................... 47
Front storage ................................ 70
Front turn signal light ..................235
Fuel............................................. 213
Fuel consumption - CO 2-
Emissions ............................... 220
Fuel for diesel engines ..............213
Fuel for liquid gas operation .......213
Fuel for petrol engines ...............213