Cadillac 2008 CTS Navigation System Owner's Manual page 56

Display
Press the CONFIG key to enter the menu options, then
press the CONFIG key repeatedly until Display is
selected or touch the Display screen button.
Display Off
Touch this screen button to turn the display off. Press
any hard key such as NAV, AUDIO, FAV, CONFIG,
DEST, SCREEN, or TONE to view the display.
2-40
Brightness/Contrast/Mode
Touch this screen button to change the brightness,
contrast, and mode of the display.
] (Brightness): Touch the + (plus) or − (minus) screen
buttons to increase or decrease the brightness of the
screen.
_ (Contrast): Touch the + (plus) or − (minus) screen
buttons to increase or decrease the contrast of the
screen.
Auto (Automatic): Touch this screen button for the
system to automatically adjust the screen background
depending on exterior lighting conditions.
Day: Touch this screen button and the system will
make the map background brighter.
Night: Touch this screen button and the system will
make the map background darker.
The dimming change button on the navigation faceplate
is used to toggle between these dimming modes.