Using the brake pedal
While HDC is controlling the speed, the set de‐
sired speed can be reduced by depressing the
brake pedal.
Deactivating HDC
Press the button again. The LED goes out.
HDC is automatically deactivated above
approx. 25 mph/40 km/h.
Malfunction
If a malfunction occurs, a message is displayed in
the instrument cluster.
Integral Active Steering
Concept
The Integral Active Steering increases the ma‐
neuverability and makes a more direct steering
response possible.
General information
Integral Active Steering is a combination of varia‐
ble steering ratio and rear axle steering.
The steering is more direct because the variable
steering ratio amplifies the wheel angle while
maneuvering. The rear axle steering acts to in‐
crease maneuverability at low speeds by turning
the rear wheels slightly in the opposite direction
to the front wheels.
At higher speeds, the rear wheels are turned in
the same direction as the front wheels. This re‐
sults in, for instance better directional stability
and a more harmonious change of direction.
In critical driving situations, the Integral Active
Steering can stabilize the vehicle through pur‐
poseful steering of the rear wheels before the
driver intervenes, for instance in case of over‐
steering.
Tuning
The system offers several different tunings.
Driving mode Integral Active Steering
COMFORT
ECO PRO
Comfortable, for optimal
travel comfort.
SPORT Dynamic, for greater agility.
The different tunings are assigned to the differ‐
ent drive modes of the Driving Dynamics Control.
Additional information:
Driving Dynamics Control, refer to page 140.
Using snow chains
In order to guarantee free running of the wheels
when operating with snow chains, rear axle
steering of the integral active steering must be
switched off when snow chains are mounted.
Additional information:
Rear axle steering during operation with snow
chains, refer to page 367.
Malfunction
In the event of a malfunction, the steering wheel
must be turned further at lower speeds, while the
vehicle responds more sensitively to steering
wheel movements in the higher speed range.
The stability-enhancing intervention may be de‐
activated.
Proceed cautiously and drive defensively.
Have the system checked by a dealer's service
center or another qualified service center or re‐
pair shop.
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CONTROLS
Driving stability control systems
230
Online Edition for Part no. 01405A10FB7 - VI/20
