•
In addition, if the cruise control system or Adaptive Cruise Control (ACC) is switched off:
if the vehicle speed is less than approximately 80 km/h (50 mph)
or
the brake pedal is
depressed.
•
In addition, if the cruise control system or Adaptive Cruise Control (ACC) is active:
if the
stored speed is exceeded.
Deactivating downhill speed control automatically:
• If the downhill gradient becomes less steep.
•
OR:
if the gearbox shifts up a gear because the engine speed is higher than approximately
4,500 rpm.
•
Or in addition if the cruise control system or Adaptive Cruise Control (ACC) is active:
if
the stored speed can be maintained.
Hill Descent Control
When Hill Descent Control is active, the indicator lamp
lights up white.
When Hill Descent Control is not active, the indicator lamp
lights up grey. The system is
switched on, but is not regulating.
The Hill Descent Control system automatically brakes all four wheels to limit the speed when driving
forwards and reversing on steep downhill gradients. The wheels will not lock as the anti-lock brake
system remains active. In vehicles with a manual gearbox, Hill Descent Control adjusts the target
speed so that the engine speed does not drop below the idling speed.
If you enter a downhill slope travelling at a speed under 30 km/h (18 mph), the vehicle speed will be
limited to a speed between min. 2 km/h (1 mph) and max. 30 km/h (18 mph). The driver can use the
accelerator pedal and the brakes to alter the speed in this range. The control speed will be set
again as soon as the driver takes their foot off the accelerator or brake pedal.
However, this can work only if the tyres have sufficient grip on the road. Hill Descent Control
cannot
work on an icy or slippery slope, for example.
Hill Descent Control is automatically activated if the following conditions are met:
• The engine is running.
• The
Off-road
driving profile is selected
⇒
Driving profile selection and 4MOTION Active
Control
.
• The speed is under 30 km/h (18 mph) (the
function display is visible on the instrument
cluster display).
• The downhill gradient is at least 10 %.
• You do not brake or accelerate.
The Hill Descent Control function will be deactivated when the downhill gradient is less than 5 %.
The intelligent downhill speed control technology cannot overcome the laws of physics,
and functions only within the limits of the system. Never allow the extra convenience
afforded by pull-away assist systems to tempt you into taking any risks when driving.
• Unintentional vehicle movements can cause serious injury.
• The downhill speed control cannot replace the full concentration of the driver.
• Always adapt your speed and driving style to suit visibility, weather, road and traffic
conditions.
• Downhill speed control cannot hold the vehicle in all hill start situations or brake it
sufficiently on all slopes going downhill (e.g. if the ground is slippery or icy).
WARNING
Always be prepared to brake the vehicle. Accidents and injuries could occur if this is not
ensured.
• The downhill speed control is only a support function and may not be able to brake the
vehicle sufficiently in all situations when driving downhill.
• The vehicle may become faster despite the downhill speed control being in operation.
WARNING
