In order to:
You must
⇒
fig. 272
:
Result:
Push and hold the lever
long-
er
in the
position
(5)
to
reduce the set speed contin-
uously until the lower desired
speed is reached and the
lever is released.
Switch off ACC.
Push the lever to
position
(4)
.
The system is switched
off and the stored speed
is canceled.
When you push the lever
⇒
fig. 272
briefly
to
position
(2)
, the speed will be increased first to the
next highest value in increments of 5 mph (10 km/h), like from 47 mph (76 km/h) to 50 mph (80 km/h).
Only after that it is possible to increase the speed in increments of 5 mph (10 km/h) by
briefly
pushing
the lever to the
position
(2)
.
ACC works in the same way when reducing the set speed.
Requirements for activating ACC
Lever is in the
(1)
position.
The selector lever must be in
D
,
S
or in Tiptronic mode.
Gradient angles can't be more than +/- 19 %.
Brake pedal is depressed when vehicle is standing still.
the driver safety belt is fastened.
The doors and the engine hood are closed.
The electronic parking brake is released
Hill Descent Assist is not activated.
The vehicle is not rolling backwards.
There is no parked vehicle or other object in front of your moving vehicle.
Activating ACC
When ACC is active one of the 2 green indicator lights (
or
) light up and the set speed is shown in
the display of the instrument cluster and indicated by red dots on the speedometer. Text messages
and indicator lights in the instrument cluster inform you about the status of the system
⇒
page 459.
When ACC is switched, activated and properly working, it will store and regulate the desired speed.
The set speed can vary from the actually driven speed if ACC is regulating the distance to the vehicle
travelling ahead.
Decelerating to a stop
If a vehicle ahead decelerates to a stop the Adaptive Cruise Control likewise decelerates your vehicle
to a standstill. After this vehicle is kept in place by the brakes.
In this state using the brake does not deactivate the Adaptive Cruise Control.
If you unlock the safety belt, open the a door or the engine hood, switch off the ignition during such a
braking state or if the stop exceeds about three minutes, the Adaptive Cruise Control switches off
temporarily and activates the parking brake.
