Volvo XC90 Twin Engine 2019, Owner'S Manual

Page: 479 / 700

STARTING AND DRIVING
477
Hill descent control
Hill descent control (HDC
13
) is a low speed
function with enhanced engine braking. The
function makes it possible to increase or reduce
the car's speed on steep downhill gradients
using only the accelerator pedal, without using
the foot brake.
The function is included in drive mode
Off
Road
.
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, assis-
ted by the brake system. 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.
The driver can brake and reduce crawling speed,
or stop the car at any time by using the foot
brake.
The function is activated together with low speed
control (LSC
14
) which facilitates driving and
improves traction for driving off-road and on slip-
pery surfaces. The systems are designed for use
at low speed, up to approx. 40 km/h (25 mph).
Points to remember when driving with
HDC
•
If the function is disabled while driving on a
steep downhill gradient, the braking effect
will gradually decrease.
•
HDC can be used in gear position D , R , and
with 1st or 2nd gear with manual gear
changing.
•
It is not possible to change to 3rd gear or
higher with manual gear changing.
NOTE
When LSC with HDC is activated by the Off
Road driving mode, the feel of the accelera-
tor pedal and engine response are changed.
NOTE
The driving mode is not designed to be used
on public roads.
NOTE
The function is deactivated when driving at
higher speeds and must be reactivated at a
lower speed, if required.
Related information
•
Activating and deactivating hill descent con-
trol with the function button (p. 478)
•
Changing drive mode (p. 470)
•
Low speed control (p. 475)
•
All-wheel drive (p. 464)
13
Hill Descent Control
14 Low Speed Control