Volvo XC90 TWIN ENGINE 2019 Owner's Manual page 504

STARTING AND DRIVING
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Related information
Low speed control (p. 501)
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Changing drive mode (p. 494)
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13 Hill Descent Control
14 Low Speed Control
502
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 gra-
dients using only the accelerator pedal, with-
out using the foot brake.
The function is included in drive mode
Road
.
Hill descent control is adapted for off-road
driving at low speeds and facilitates driving on
steep downhill gradients with difficult surfa-
ces. 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 responsi-
bility for ensuring that the vehicle is driven
safely.
Function
Hill descent control allows the car to roll at
inching speed both forward and backward,
assisted 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 with-
out the need for the foot brake to be used. The
brake lights are switched on when the func-
tion is operating.
The driver can brake and reduce crawling
speed, or stop the car at any time by using the
foot brake.
Off
The function is activated together with low
speed control (LSC
and improves traction for driving off-road and
on slippery 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.
14
) which facilitates driving