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Operation
The following conditions may lead the ACC
not to react:
●
If the accelerator is pressed.
●
If there is no gear engaged.
●
If the ESC is controlling.
●
If the driver is not wearing his/her seat
belt.
●
If several brake lights of the vehicle or elec-
trically connected trailer are damaged.
●
If the vehicle is reversing.
●
Driving faster than 160 km/h (100 mph).
WARNING
There is a danger of rear collision when the
minimum distance to the vehicle in front is
exceeded and the speed difference between
both vehicles is so great that a speed reduc-
tion by the ACC will not suffice. In this case
the brake pedal should be applied immedi-
ately.
●
The ACC may not be able to detect all situa-
tions properly.
●
“Stepping” on the accelerator may cause
the ACC not to intervene in braking. Driver
braking will have priority over intervention by
the speed control or adaptive cruise control.
●
Always be ready to use the brakes!
●
Observe country-specific provisions gov-
erning obligatory minimum distances be-
tween vehicles.
Note
●
The programmed speed is erased once the
ignition or the ACC are switched off.
●
When the traction control system (ASR) is
deactivated during acceleration or else the
ESC is activated in Sport* Mode (››› page 81),
the ACC switches off automatically.
●
In vehicles with the Start-Stop system, the
engine switches off automatically during the
ACC stopping phase and restarts automatical-
ly to begin driving.
Vehicles with an automatic gearbox
If the vehicle is equipped with automatic
gearbox, the ACC can brake the vehicle until
it stops completely if a vehicle in front of it
stops.
The ACC will still be available for a few sec-
onds. The vehicle will restart by itself if the
vehicle in front moves (traffic jam assistant).
Disconnection criteria
The ACC will switch off if the driver applies
the brake pedal or the driver's door is
opened.
If the vehicle in front remains stationary for
more than 3 seconds, the ACC will also
switch off for safety reasons. In this case the
driver should take control and apply the
brake.
In the latter case, when the ACC is switched
off with the vehicle stationary, the vehicle
has to be braked by the pedal, since al-
though the car is idling it can move, as there
is a gear engaged.
Restarting the vehicle with the ACC manually
The ACC can be activated again by moving
the lever to position
2
››› Fig. 154
.
WARNING
Your vehicle can start up even if there is an
obstacle between your vehicle and the vehi-
cle detected in front. Risk of accident!
CAUTION
●
If your vehicle with ACC does not start up
as expected, you can drive off by briefly step-
ping on the accelerator.
●
The Start-Stop system usually acts if you
are driving with ACC.
156
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