Switching between upper and lower case letters
Depending on the menu, you can switch between entering upper and lower case letters:

See also:
The concept
The iDrive combines the functions of a multitude
of switches. Thus, these functions can be operated
from a central location. ...
Activation/deactivation
Press the button. ...
Audio playback
Selecting the track using the button
Press the button repeatedly
until the
desired track is played.
Selecting a track via iDrive
Audio CDs
Select the desired track to begin playback.
CDs/D ...
