Toyota 2006 Highlander Owner's Manual page 209

SELECTING THE MODE
Use the joystick to select the mode. Push
the "ENT" button to enter the mode.
'06 HIGHLANDER_U (L/O 0508)
The mode display which is selected by
the joystick is colored blue. When the
"ENT" button is pushed, the mode display
changes to green. If the mode display is
gray, it cannot be selected.
The "Speaker sound" on the mode display
is selected on the front audio system.
Radio
Cassette tape player and compact disc
player
199