Problems with cruise control
Problem
Possible causes/consequences and M Solutions
On vehicles with steering
wheel buttons, the
speed cannot be set
when cruise control is
activated.
The display shows a high-priority message. Thus a change in speed is
not possible.
X
Proceed as instructed by the message in the display.
X
Deactivate cruise control
COLLISION PREVENTION ASSIST
General notes
COLLISION PREVENTION ASSIST comprises the
distance warning function and adaptive Brake
Assist.
Distance warning function
Important safety notes
i
Note the section on 'Important safety notes'
(
Y page 52).
G
WARNING
The distance warning function does not react:
R
to people or animals
R
to oncoming vehicles
R
to crossing traffic
R
when cornering
Thus, the distance warning function cannot
provide a warning in all critical situations.
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
G
WARNING
The distance warning function cannot always
clearly identify objects and complex traffic
situations.
In such cases, the distance warning function
may:
R
give an unnecessary warning
R
not give a warning
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and do not rely solely on the distance
warning function.
Operation
The distance warning function can help you to
minimize the risk of a front-end collision with a
vehicle ahead or reduce the effects of such a
collision. If the distance warning function
detects that there is a risk of a collision, you will
be warned visually and acoustically. Without
your intervention, the distance warning function
cannot prevent a collision.
The distance warning function will issue a warn-
ing at speeds of around 20 mph (30 km/h) or
more if:
R
you approach a vehicle ahead of you very
quickly. You will then hear an intermittent
warning tone and the red · warning lamp
in the instrument cluster flashes.
X
Brake immediately in order to increase the
distance from the vehicle in front.
or
X
Take evasive action provided it is safe to do
so.
If you want the distance warning function to
assist you, the function must be activated and
operational.
Due to the nature of the system, particularly
complicated driving conditions may cause the
system to display an unnecessary warning.
With the help of the radar sensor system, the
distance warning function can detect obstacles
that are in the path of your vehicle for an exten-
ded period of time.
Up to a speed of around 45 mph (70 km/h), the
distance warning function can also react to sta-
tionary obstacles, such as stopped or parked
vehicles.
142
Driving systems
Driving and parking
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