Driving and operating187
The selected following distance is
indicated by filled distance bars in the
adaptive cruise control page.
Note that the following distance
setting is shared with the sensitivity
setting of forward collision alert
3 191.
Example: If setting 3 (far) is selected,
then the driver is warned sooner
before a possible collision, also if
adaptive cruise control is inactive or
switched off.
9 Warning
The driver accepts full
responsibility for the appropriate
following distance based on traffic, weather and visibility conditions.
Following distance must be
adjusted or the system switched
off when required by the prevailing
conditions.
Detecting the vehicle ahead
The green illuminated vehicle ahead
control indicator A is displayed when
the system detects a vehicle in the driving path.
Forward collision alert 3 191.
If this symbol does not display, or displays only briefly, adaptive cruise
control will not respond to vehicles
ahead.
Deactivation
Adaptive cruise control is deactivated by the driver when:
● y is pressed.
● Brake pedal is applied.
● Clutch pedal is depressed for more than four seconds.
● Gear selector lever of automatic transmission is moved to N.
The system is also automatically deactivated when:
● Vehicle speed accelerates above
120 mph or slows down below 9 mph (on vehicles with
automatic transmission it slows
down to a stop without
deactivating within two minutes).
● The Traction Control system is operating.
● The Electronic Stability Control is
operating.
● There is no traffic and nothing detected on the road sides for
several minutes. In this case
there are no radar echoes and
the sensor may report that it is blocked.
188Driving and operating● The collision imminent brakingsystem is applying the brakes.
● The radar sensor is blocked by an ice or water film.
● A fault is detected in the radar, engine or brake system.
Additionally, the system is
automatically deactivated on vehicles
with automatic transmission (full
speed range adaptive cruise control)
when:
● The electric parking brake is applied.
● The vehicle is being held to a stop
by the system for more than
two minutes.
● The vehicle stops, the driver's seat belt is released and the
driver's door is opened.
When adaptive cruise control is
deactivated, the control indicator m
and C in the Driver Information
Centre changes from green to white
and a pop-up message is displayed.
The stored speed is maintained. The
system is deactivated but not
switched off.9 Warning
When adaptive cruise control is
deactivated, the driver must take
over full brake and engine control.
Switching off
Press C to switch off adaptive cruise
control. The control indicator m or C
extinguishes. 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 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.
321Charging system ........................ 104
Child 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 ...............275
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 .......234
Diesel particle filter .............107, 163
Door open .................................. 110Doors............................................ 29
Driver 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......................... 245
Electric parking brake .........105, 174
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 .......227
Engine compartment fuse box ...247
Engine coolant ........................... 230
Engine coolant temperature ......107
Engine coolant temperature gauge ..................................... 101
Engine data ............................... 283
Engine exhaust .......................... 163
Engine identification ...................279
Engine oil ................... 228, 275, 280Engine oil pressure ....................108
Entry lighting .............................. 138
Event data recorders ..................317
Exit lighting ................................ 138
Exterior care .............................. 271
Exterior light ............................... 109
Exterior lighting ....................12, 128
Exterior mirrors ............................. 37
F
Fault ........................................... 171
First aid ......................................... 80
First aid kit ................................... 80
Fixed air vents ........................... 152
Fog light ..................................... 109
Fog lights ................................... 240
Folding mirrors ............................. 37
Following distance ......................106
Following distance indication ......194
Forward collision alert................. 191
Front airbag system .....................60
Front fog lights ........................... 135
Front seats.................................... 47
Front storage ................................ 70
Front turn signal light ..................236
Fuel............................................. 213
Fuel consumption - CO 2-
Emissions ............................... 220
Fuel for diesel engines ..............214
Fuel for liquid gas operation .......214
324Top-tether fastening eyes ............68
Tow bar....................................... 221
Towing ................................ 221, 267
Towing another vehicle .............269
Towing equipment .....................222
Towing the vehicle .....................267
Traction Control system ............. 176 Traction Control system off......... 107
Traffic sign assistant ...........110, 208
Trailer coupling ........................... 221
Trailer stability assist .................224
Trailer towing ............................. 222
Transmission ............................... 16
Transmission display .................167
Tread depth ............................... 256
Trip odometer .............................. 99
Turn and lane-change signals ...134
Turn signal ................................. 103
Tyre chains ................................ 258
Tyre designations ......................253
Tyre pressure ............................ 253
Tyre pressure monitoring system ............................ 108, 255
Tyre pressures ........................... 294
Tyre repair kit ............................. 258
U Ultrasonic parking assist ...106, 196
Upholstery .................................. 273
Uplevel display ........................... 110Upshift........................................ 106
Using this manual ..........................3
V Valet mode ................................. 117
Variable effort steering ...............106
Vehicle battery ........................... 232
Vehicle checks............................ 227
Vehicle data ................................ 280
Vehicle data recording and privacy ..................................... 317
Vehicle detected ahead ..............109
Vehicle dimensions .................... 291
Vehicle Identification Number ....278
Vehicle jack ................................ 252
Vehicle messages .....................119
Vehicle personalisation .............120
Vehicle security ............................ 33
Vehicle specific data ......................3
Vehicle storage ........................... 226
Vehicle tools ............................... 252
Vehicle unlocking ........................... 6
Vehicle weight ........................... 288
Ventilating ..................................... 53
Ventilation ................................... 140
W
Warning chimes .........................119
Warning lights ............................... 99
Warning triangle .......................... 80
Washer and wiper systems .........13Washer fluid ............................... 231
Wheel changing .........................261
Wheel covers ............................. 257
Wheels and tyres .......................253
Windows ....................................... 39
Windscreen................................... 39
Windscreen wiper/washer ...........86
Winter tyres ............................... 253
Wiper blade replacement ..........234
X Xenon headlights .......................238