Hill descent control is adapted for off-road driving 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.
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.
Hill descent control allows the car to roll at inching speed both forward and backward with enhanced engine braking. 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.
This function is activated by Low Speed Control (LSC), which makes it easier to drive on slippery surfaces and enables a low and even speed. Which system is active depends on the road surface, gradient of the road and car speed.
Activating hill descent control, HDC
Hill descent control only works at low speeds.
The function is activated in different ways depending on the car's equipment.
With drive mode control*
- Select the Off Road drive mode in order to activate the function.
- Select a different drive mode in order to deactivate. If the drive mode is changed while driving on a steep downhill gradient, the braking effect will gradually decrease.
In the centre display's function view
Cars without drive mode control have a function button for low speed control with Hill Descent Control in the centre display's function view.
- Press the button in order to activate the function. An indicator in the button illuminates when the function is activated.
When LSC with HDC is activated, the feel of the accelerator pedal and engine response are changed.
The driving mode is not designed to be used on public roads.
The function is deactivated when driving at higher speeds and must be reactivated at a lower speed, if required.