Forward collision warning (FCW) ð
page
112
Automatic braking
Just before the imminent collision, this
function automatically applies limited
braking to reduce the impact speed of the
collision or prohibit a crash.
If active emergency braking is applied,
flashes on the cluster.
If active emergency braking is finished,
flashes for a few seconds. During
this time, active emergency braking
cannot be applied if there is a risk of a
further collision.
Depending on version, below a speed of
19 mph or 31 mph, automatic braking
may slow down the vehicle to a complete
stop. If the speed exceeds this limit,
automatic braking reduces the speed.
However, the driver must apply the brake
to come to a complete stop.
● Automatic transmission: If the vehicle
comes to a complete stop, automatic
braking is maintained for a certain time.
Keep the brake pedal depressed to
prevent the vehicle from starting off
again.
Cruise control will be deactivated when
an automatic braking occurs. In some
cases, the driver may wish to override
the automatic braking provided by the
active emergency braking system. Firmly
apply the accelerator pedal or firmly
turn the steering wheel to override the
automatic braking if the situation and the
surroundings permit.
Warning
Do not rely on the system to brake the
vehicle. Active emergency braking will
not brake automatically outside of its
operating speed range.
Emergency brake assist
If the driver brakes, but not sufficiently
to avoid a collision, this system will
supplement the braking. This assistance
will only be provided if the driver presses
the brake pedal.
Emergency brake assist will
automatically disengage when the brake
pedal is released.
Operation conditions
Active emergency braking only works
when:
● the brake system is operational
● Electronic Stability Control and
Traction Control are activated
● the seat belts of the front seats and
depending on version of the rear seats
are fastened
● constant speed on unwinding roads
Active emergency braking is
automatically deactivated in the following
cases:
● a spare wheel with smaller diameter is
detected
● a fault with the brake pedal switch
or with the left or right brake light is
detected
● a fault in the active emergency braking
system, in the electronic or in the brake
system is detected
● a severe crash, e.g., with airbag
deployment was detected
System limitations
The system performance may be
degraded or not available in the following
cases:
● sensor covered with snow, ice, slush,
mud or dirt
● windscreen damaged or smeared, with
blurred view or covered with foreign
items, e.g. stickers
110
Advanced Driving Assistance Systems
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