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144 Driving and parking
To deactivate cruise control: push rocker
#
switch
3
(CNCL) down.
If cruise control is deactivated, it can be reactiva‐
ted as follows:
rocker switch
2
(SET+) or (SET-) stores the
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current speed and the vehicle maintains this
speed
rocker switch
3
(RES) calls up the last speed
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stored and the vehicle maintains this speed
%
If you brake, deactivate ESP
venes, cruise control is deactivated.
When you switch off the vehicle, the last
speed stored is cleared.
Active Distance Assist DISTRONIC
Function of Active Distance Assist DISTRONIC
Active Distance Assist DISTRONIC maintains the
set speed on free-flowing roads. If vehicles ahead
are detected, the set distance is maintained, if
necessary until the vehicle comes to a halt. The
vehicle accelerates or brakes depending on the
distance to the vehicle in front and the set speed.
Speed and distance are set and stored on the
steering wheel. The speed can be set in the range
between 15 mph (20 km/h) and 99 mph
(160 km/h) or between 15 mph (20 km/h) and
the vehicle's maximum speed.
Other features of Active Distance Assist
DISTRONIC:
Depending on the preselected distance,
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DISTRONIC intervenes either dynamically
(short distance) or to save fuel (long dis‐
tance).
Depending on the vehicle mass detected, the
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dynamics of the DISTRONIC intervention are
reduced.
Rapid acceleration to the stored speed is initi‐
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ated if the turn signal indicator is switched on
to change to the overtaking lane.
Active Distance Assist DISTRONIC is only an aid.
The driver is responsible for the distance to the
vehicle in front, for vehicle speed and for braking
in good time.
System limitations
The system may be impaired or may not function
in the following instances:
The radar sensors are affected by snow, rain,
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fog, heavy spray, glare, direct sunlight or
greatly varying ambient light.
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R
R
R
R
®
®
or if ESP
inter‐
Do not use Active Distance Assist DISTRONIC in
these situations.
The radar sensors may malfunction in parking
garages or on roads with steep uphill or
downhill gradients.
If the radar sensors are dirty or covered.
On icy or slippery roads, braking or accelerat‐
ing can cause the drive wheels to lose trac‐
tion and the vehicle could then skid.
Stationary objects are not detected if these
were not previously detected as moving.
On bends, target vehicles may be lost or not
recognized correctly. As a result, a target
vehicle is not used to regulate the speed
which may lead to unwanted acceleration.
& WARNING Risk of accident from acceler‐
ation or braking by Active Distance Assist
DISTRONIC
Active Distance Assist DISTRONIC may accel‐
erate or brake in the following cases, for
example:
If the vehicle pulls away using Active Dis‐
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tance Assist DISTRONIC.
If the stored speed is called up and is con‐
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siderably faster or slower than the cur‐
rently driven speed.
If Active Distance Assist DISTRONIC no
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longer detects a vehicle in front or does
not react to relevant objects.
Always carefully observe the traffic con‐
#
ditions and be ready to brake at all
times.
Take into account the traffic situation
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before calling up the stored speed.
& WARNING Risk of accident due to insuf‐
ficient deceleration by Active Distance
Assist DISTRONIC
Active Distance Assist DISTRONIC brakes
your vehicle with up to 50% of the maximum
possible deceleration. If this deceleration is
not sufficient, Active Distance Assist
DISTRONIC alerts you with a visual and
acoustic warning.
In these cases, adjust your speed and
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keep a sufficient distance.
Brake the vehicle yourself and/or take
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evasive action.
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