When the gradient decreases.
If the transmission upshifts because the engine speed is greater than approximately 4500 rpm.
If the cruise control system (CCS) is also active: if the saved speed can be maintained.
If the Adaptive Cruise Control (ACC) is also active: if the saved speed can be maintained.
WARNING
The downhill speed control is not a replacement for the driver's attention and works only within the system limitations. The
downhill speed control cannot detect all driving situations and may not react, or may react with a delay, or may react in a
way that is not desired. If you are careless, there is a risk of accidents due to unintentional vehicle movement. This can
cause serious or fatal injuries.
Always stay attentive and do not rely solely on the system. The driver is always responsible for control of the
vehicle.
Be aware that the downhill speed control cannot hold the vehicle on the incline or brake sufficiently going downhill
in every situation, for example if the ground is slippery or icy.
Always be ready to brake, in particular if the ground is slippery or icy.
Manually brake the vehicle if the vehicle moves faster despite downhill speed control.
Always adapt your speed and driving style to the visibility, weather, road and traffic conditions.
Hill Descent Control
Hill Descent Control helps the driver
when traveling on slopes.
System function
Hill descent control maintains the speed on all four wheels when driving forward or in reverse on steep inclines through
automatic braking interventions. The wheels will not lock up because the Anti-Lock Brake System (ABS) remains active.
When starting to drive downhill at speeds less then 30 km/h (approx. 19 mph), the speed is limited to minimum 2 km/h
(approx. 1 mph) and maximum 30 km/h (approx. 19 mph). The driver can increase or decrease the vehicle speed within these
speed limits by pressing the accelerator or brake pedal.
However, there must be enough traction. Hill descent control cannot function as expected, if for example the hill is icy or if the
surface is greasy.
Displays
Depending on the driving situation, one of the following indicator lights will light up in the instrument cluster:
Hill Descent Control is active.
Hill Descent Control is not active.
If hill descent control is not active, the indicator light turns gray. The system is activated, but it is not regulating.
When is it active?
Hill descent control is automatically activated under the following conditions:
The vehicle engine must be running.
The speed must be less than 30 km/h (approx. 19 mph), the
The gradient must be at least 10%.
indicator light appears in the instrument cluster display.
The brake pedal or accelerator pedal must not be pressed.
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