Cadillac 2008 CTS Navigation System Owner's Manual page 84

Audio Language: Touch English, French, or Spanish
to change the language that you are listening to.
Subtitle Language: Touch English, French, or Spanish
to change the language of the subtitles.
Menu Language: Touch English, French, or Spanish to
change the language of the menus.
3-22
Aspect: Touch this button to change the aspect ratio of
the DVD. This may not be available on all DVDs.
Brightness/Contrast/Mode: From the DVD Setup
screen, touch this button to change the brightness,
contrast, and mode of the screen while playing a DVD.
!
(Brightness): Touch the up or down screen
arrows to increase or decrease the brightness of the
DVD screen.
_
(Contrast): Touch the up or down screen arrows to
increase or decrease the contrast of the DVD screen.
Auto (Automatic): Touch this screen button for
the system to automatically adjust the navigation screen
background depending on exterior lighting conditions.
Night: Touch this screen button and the system
will make the navigation screen background darken.
Day: Touch this screen button and the system will make
the navigation screen background brighten.