Driving and operating181Switching on
Press m; control indicator m in
instrument cluster illuminates white.
Activation
Accelerate to the desired speed and
turn thumb wheel to SET/-, the
current speed is stored and
maintained. Control indicator m in
instrument cluster illuminates green.
Set speed is indicated on midlevel or
uplevel display near m symbol.
Accelerator pedal can be released.
Vehicle speed can be increased by depressing the accelerator pedal.
When the accelerator pedal is
released, the previously stored speed
is resumed.
Cruise control remains activated
while gearshifting.
Increase speed With cruise control active, hold thumb
wheel turned to RES/+ or briefly turn
to RES/+ repeatedly: speed
increases continuously or in small
increments.
Alternatively accelerate to the desired speed and store by turning to SET/-.
Reduce speed With cruise control active, hold thumb
wheel turned to SET/- or briefly turn to
SET/- repeatedly: speed decreases
continuously or in small increments.Deactivation
Press y; control indicator m in
instrument cluster illuminates white.
Cruise control is deactivated. Last
stored speed remains in memory for
later speed resume.
Automatic deactivation: ● Vehicle speed is below approx. 20 mph.
● Vehicle speed drops more than 15 mph below the set speed.
● The brake pedal is depressed.
● The clutch pedal is depressed for
a few seconds.
● The selector lever is in N.
● The engine speed is in a very low
range.
● The Traction Control system or Electronic Stability Control is
operating.
● The forward collision alert has been triggered.
Driving and operating1879Warning
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 3 190.
If this symbol does not display, or displays 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.● The collision imminent braking system 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 safety belt is released and the
driver's door is opened.
When adaptive cruise control is
deactivated automatically, the control indicator m or C illuminates white
and a warning message is displayed
as a pop-up in the Driver Information
Centre.
The stored speed is maintained.
188Driving and operating9Warning
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.● Adaptive cruise control does notbrake 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.
319Charging 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 ..............314
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 ............311
DEF ............................................ 164
Diesel exhaust fluid ....................164
Diesel fuel system bleeding .......233
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......................... 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, 278Engine oil pressure ....................108
Entry lighting .............................. 138
Event data recorders ..................316
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
322Tow bar....................................... 220
Towing ................................ 220, 266
Towing another vehicle .............268
Towing equipment .....................222
Towing the vehicle .....................266
Traction Control system ............. 175
Traction Control system off......... 107
Traffic sign assistant ...........110, 208
Trailer coupling ........................... 220
Trailer stability assist .................223
Trailer towing ............................. 221
Transmission ............................... 16
Transmission display .................167
Tread depth ............................... 255
Trip odometer .............................. 99
Turn and lane-change signals ...134
Turn signal ................................. 103
Tyre chains ................................ 257
Tyre designations ......................252
Tyre pressure ............................ 252
Tyre pressure monitoring system ............................ 108, 254
Tyre pressures ........................... 292
Tyre repair kit ............................. 257
U
Ultrasonic parking assist ...106, 196
Upholstery .................................. 272
Uplevel display ........................... 110Upshift........................................ 106
Using this manual ..........................3
V Valet mode ................................. 117
Variable effort steering ...............106
Vehicle battery ........................... 231
Vehicle checks............................ 226
Vehicle data ................................ 278
Vehicle data recording and privacy ..................................... 316
Vehicle detected ahead ..............109
Vehicle dimensions .................... 289
Vehicle Identification Number ....276
Vehicle jack ................................ 251
Vehicle messages .....................119
Vehicle personalisation .............121
Vehicle security ............................ 33
Vehicle specific data ......................3
Vehicle storage ........................... 225
Vehicle tools ............................... 251
Vehicle unlocking ........................... 6
Vehicle weight ........................... 286
Ventilating ..................................... 53
Ventilation ................................... 140
W
Warning chimes .........................120
Warning lights ............................... 99
Warning triangle .......................... 80
Washer and wiper systems .........13Washer fluid ............................... 230
Wheel changing .........................260
Wheel covers ............................. 256
Wheels and tyres .......................252
Windows ....................................... 39
Windscreen................................... 39
Windscreen wiper/washer ...........86
Winter tyres ............................... 252
Wiper blade replacement ..........233
X Xenon headlights .......................237