Instrument panel lighting
The instrument panel lighting illuminates when
the ignition key is in position II and the light
switch (1) is in either position 
Move the thumb wheel (4) up to increase brightness or down to decrease brightness.
See also:
Operating DAC
Certain settings can be made from the menu
system controlled from the center instrument
panel.
The current system status can be checked on
the trip computer’s display by using the buttons
on ...
Main USB menu
USB menu
Play/Pause
Stop
Random
Repeat folder
Select USB device
Change subtitles
Change audio track
Scan
Audio settings ...