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HDC Hill Descent Control
Concept
Hill Descent Control, HDC, is a downhill control
feature that controls the vehicle speed on
steep downhill grades, for instance when driv‐
ing on unpaved roads.
When the system is active, the vehicle moves
at the speed set by the driver, without the
driver having to depress the brake pedal.
While HTC is controlling the speed, the system
automatically distributes the braking force to
the individual wheels. This improves vehicle
drivability and stability. If necessary, the Anti‐
lock Brake System prevents the wheels from
locking.
General information
Hill Descent Control can be activated at
speeds below approx. 25 mph/40 km/h.
Speeds can be set between approx.
2 mph/3 km/h and approx. 20 mph/30 km/h.
When the vehicle is moving downhill, the sys‐
tem reduces the speed to the set value, within
the physical limits.
Overview
Button in the vehicle
HDC
Activating HDC
Press button. The LED above the button
lights up.
Speeds between approx. 2 mph/3 km/h and
approx. 20 mph/30 km/h are adopted as the
desired speed.
Emergency braking function, Active PDC: the
emergency braking function, refer to
page 188, is deactivated.
Display in the instrument cluster
A symbol and the selected de‐
sired speed are displayed.
▷ Green display: HDC is ac‐
tive, the system is reducing
the vehicle speed.
▷ Gray display: HDC is on standby.
Display in the Head-up Display
The HDC status can also be displayed in the
Head-up Display.
Increasing or decreasing vehicle
speed
Using the cruise control rocker switch
The desired speed can be changed using the
cruise control rocker switch on the steering
wheel.
▷ Press the rocker switch up: the speed in‐
creases gradually.
Seite 171
Driving stability control systems Controls
171
Online Edition for Part no. 01402984955 - X/17
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