Hill Descent Control (Hdc) - Volvo XC 90 Owner's Manual

STARTING AND DRIVING

Hill Descent Control (HDC)

HDC is a type of low-speed automatic engine
brake and makes it possible to increase or
decrease the vehicle's speed on steep downhill
gradients using only the accelerator pedal, with-
out applying the brakes.
Off Road
HDC is integrated into the
mode.
HDC is particularly useful when driving down
steep hills with rough surfaces, and where the
road may have slippery patches.
WARNING
HDC does not function in all situations, and is
a supplementary braking aid. The driver has
full responsibility for driving in a safe manner.
Function
HDC allows the vehicle to roll forward or in
reverse at very low speed with enhanced engine
braking. However, speed can be adjusted to a
higher level with the accelerator pedal. When the
accelerator pedal is released, the vehicle will
return to very low speed regardless of the steep-
ness of the hill and without applying the brakes.
The brake lights illuminate when HDC is func-
tioning.
The driver can use the brakes to slow or stop the
vehicle at any time.
404
HDC is activated along with Low Speed Control
(LSC), which together make driving on slippery
surfaces at low speeds easier.
When HDC and LSC are activated, this changes
the response from the accelerator pedal and
engine.
drive
Activating HDC
This function can be activated in different ways,
depending on how the vehicle is equipped.
Off Road
Select the
function.
Select a different drive mode to turn HDC off. If
this is done while the vehicle is on a steep down-
grade, engine braking will decrease gradually.
Related information
•
Brake functions (p. 395)
•
Low Speed Control (LSC) (p. 403)
drive mode to activate the
•
Drive modes (p. 388)