Toyota 2007 Prius Owner's Manual page 268

The player will skip any empty disc trays.
When the AUX adapter is in use, each
time you push the "DISC·AUX" button, the
audio switches the compact disc mode
and AUX mode alternately. For details
about AUX adapter, see page 278.
Type 2:
Push the "DISC·AUX" button if the disc
is already loaded in the player.
"CD" appears on the display.
The discs set in the player are played
continuously. The track number and the
time from the beginning of the program
are shown on the display.
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(c) Selecting a desired disc (Type 1 only)
Touch the desired disc number.
The selected disc number is highlighted in
green.
The player will start playing the selected
disc from the first track.
(d) Selecting a desired track
"SEEK·TRACK" button:
Push the "SEEK·TRACK" button. The play-
er will start playing the selected track
from the beginning.
Track list screen:
Touch the desired track displayed on the
track list screen.
The track list screen cannot be displayed
while driving.
For details about the track list screen, see
"Displaying the track list" on page 270.