Cadillac 2004 CTS - Manual (Page 173)

If you have the Navigation system, use the following to
operate the DIC:
INFO (Information): Use this button to access the
Vehicle Information menu that provides the status
of various vehicle systems. See “Vehicle Information
Menu (Navigation System)” under
Status of Vehicle
Systems on page 3-52.
TUNE/SEL (Select) Knob: See the information listed
previously on this knob. It is equivalent to the TUNE/SEL
knob on the Base audio system and is located in the
same place.
Press the button with the circle on it when it is next to a
menu item or a prompt on the right side of the display
to select the menu item or acknowledge the prompt.
See “Status Menu Item Descriptions” under
Status
of Vehicle Systems on page 3-52.
Navigation/Audio System
3-51