Volvo S 90, Owner'S Manual

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STARTING AND DRIVING
* Option/accessory, for more information, see Introduction. 360
Emergency brake lights
The emergency brake lights activate in the event
of hard braking/rapid deceleration at most nor-
mal driving speeds or if the ABS system is acti-
vated. This function causes an additional taillight
on each side of the vehicle to illuminate to help
alert vehicles traveling behind.
Once the emergency brake lights have been acti-
vated, if the driver releases the brake pedal, the
brake lights will return to their normal function.
Related information
•
Brakes (p. 356)
•
Hazard warning flashers (p. 145)
•
Brake lights (p. 144)
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.
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 with
the accelerator pedal. When the accelerator
pedal is released, the vehicle will return to very
low speed.
The driver can use the brakes to slow or stop the
vehicle at any time.
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.
Activating HDC
This function can be activated in different ways,
depending on how the vehicle is equipped.
Using the drive mode control
*
Select the
Off Road
drive mode to activate 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.