See also:

Activating HDC
Press the button; the LED above the button lights up. ...

Fuel quality
Fuels that are marked on the gas pump as containing metal must not be used. Refuel only with unleaded gasoline without metallic additives. Do not refuel with any leaded gasoline or gasoline with ...

Switching off automatically
The system switches off and the LED goes out: ▷ After approx. 160 ft/50 m when driving forward. ▷ Above approx. 22 mph/36 km/h when driving forward. Switch on the system again if nece ...