Hill Descent Control - Volvo XC 90 Owner's Manual

NOTE
The function is deactivated when driving at
higher speeds and must be reactivated at a
lower speed, if required.
Related information
•
Brake functions (p. 362)
•
Hill descent control (p. 371)
•
Drive modes (p. 357)

Hill descent control

Hill descent control, Hill Descent Control
(HDC), is a low speed function with enhanced
engine braking. The function makes it possible
to increase or reduce vehicle speed on steep
downhill gradients using only the accelerator
pedal, without using the foot brake. HDC is
Off Road
included in the drive mode.
Hill descent control is adapted for off-road driv-
ing at low speeds and facilitates driving on steep
downhill gradients with difficult surfaces. The
driver does not need to use the brake pedal, but
can instead focus on steering.
WARNING
HDC does not work in all situations but is
designed merely as a supplementary aid.
The driver always bears ultimate responsibility
for ensuring that the vehicle is driven safely.
Function
Hill descent control allows the car to roll at
inching speed both forward and backward with
enhanced engine braking. The speed can be
increased by using the accelerator pedal. When
the accelerator pedal is then released the car
slows back down to crawling speed, regardless of
the gradient of the hill and without the need for
the foot brake to be used. The brake lights are
switched on when the function is operating.
STARTING AND DRIVING
The driver can brake and reduce crawling speed,
or stop the car at any time by using the foot
brake.
This function is activated by Low Speed Control
(LSC), which makes it easier to drive on slippery
surfaces and enables a low and even speed.
Which system is active depends on the road sur-
face, gradient of the road and car speed.
Activating hill descent control, HDC
Hill descent control only works at low speeds.
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