Volvo 2008 V70 Owner's Manual page 108

HDC can be switched on and off with the button in the center console. An indicator light in the button illuminates
when HDC is activated.
The indicator light
controlling the vehicle's speed.
HDC only functions when first or reverse gears are selected (1 will be shown in the instrument panel display when
first gear is selected.).
NOTE
HDC cannot be activated if the gear selector is the D position.
Using HDC
HDC allows the car to roll forward at a maximum speed of 6 mph (10 km/h), and 4 mph (7 km/h) in reverse.
However, the accelerator pedal can be used to select any speed that is possible in first or reverse gears. When the
accelerator pedal is released, speed is quickly reduced again to 6 mph (10 km/h) or 4 mph (7 km/h), depending on the
gear selected, regardless of the hill's gradient. It is not necessary to apply the brakes.
The brake lights illuminate automatically when HDC is controlling the vehicle's speed.
The driver can slow or stop the vehicle at any time by applying the brakes.
HDC is deactivated when:
The button on the center console is pressed
A gear higher than first gear is selected
D is selected on vehicles with an automatic transmission
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03 Your driving environment
Hill Descent Control (HDC)
HDC can be deactivated at any time. If this is done while driving down a steep hill, the system's braking effect will
decrease gradually.
NOTE
Engine response to pressure on the accelerator pedal may be slightly slower than normal when HDC is activated.
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03 Your driving environment
in the instrument panel illuminates and a message is displayed when the system is