See also:

Saving the spoken instructions on the programmable memory buttons
The function for switching the spoken instructions on/off can be stored on a programmable memory button, for quick access. ...

Deactivating HDC
Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Deleting the button assignments
1. Press buttons 1 and 8 simultaneously for approx. five seconds. 2. "OK" ...