Fig. 275
In the instrument cluster display. Alert: Distance to vehicle ahead is too small.
Please first read and note the introductory information and heed the WARNINGS
The Forward Collision Warning system (Front Assist), when switched on, uses a radar sensor to help
prevent rear-end collisions by providing a warning of a possible collision with a vehicle on the road
ahead within physical and technical limits of the system.
The Forward Collision Warning system (Front Assist) is not a substitute for the driver's full
concentration.
Distance warning
If the vehicle is traveling within a speed range of about 44–130 mph (70–210 km/h), the system warns
the driver with a message in the instrument cluster display
⇒
fig. 275
if it detects that the vehicle is
driving too close to the vehicle ahead
⇒
.
The warning period varies according to the traffic situation and your driving style.
Advance warning
If the vehicle is traveling within a speed range of about 18–130 mph (30–210 km/h), the system warns
the driver with a warning chime and a message in the instrument cluster display (
⇒
fig. 274
) if it de-
tects a possible collision with a vehicle ahead
⇒
.
The warning period varies according to the traffic situation and your driving style.
However, do not rely solely on Front Assist. Under certain conditions, the reactions of Front Assist
may be unexpected or delayed from the driver's viewpoint. Always pay attention and take over if
necessary
⇒
.
Immediate warning
Front Assist can initiate a short active braking maneuver, should you not react accordingly to an ad-
vance alert. In this case you will notice brief jerky braking of the vehicle, in order to warn you of an
impending collision.
The moment of this alert can vary, depending on the traffic situation and the driving behavior.
Automatic braking maneuver
If you should also fail to react to the immediate alert, the system can initiate an automatic braking
maneuver which will slow down the vehicle with gradually increasing braking force. Shortly before a
collision the system can also initiate an emergency braking in order to bring the vehicle to a full stop.
The reduction of speed can help to minimize the effects of a collision.
Braking support
Front Assist can help to minimize the effects of a collision by supporting with additional braking force in
case of an emergency braking situation, should the system detect that the force applied to the brake
pedal by the driver is not sufficient in order to avoid a collision. In order for Front Assist to apply this
support, it must have detected an impending collision with another vehicle ahead of yours and the
