Honda RDX Owner's Manual page 206

Audio System
2. Insert a disc into the disc slot
when the disc load indicator turns
green, and ''LOAD'' appears on
the upper display at the same time.
Insert the disc only about halfway;
the drive will pull it in the rest of
the way. You will see the disc
number blinking on the upper
display, and the disc load indicator
turns red again and blinks as the
CD is loaded.
Do not try to insert a disc until
''LOAD'' appears. You could
damage the audio unit.
3. You will see ''DISC READ'' on the
upper display, then the system
begins to play the CD.
200
EMPTY POSITION
You can load a CD into an empty
position while a CD is playing. Press
the AUDIO button to view the audio
control display. Select the empty
position (''No Disc'' is shown on the
audio control display) by rotating the
interface dial. Then press ENTER on
the selector to enter your selection.
The current CD stops playing and
starts the loading sequence. The CD
just loaded will play.
You can also select the empty
position by pressing the appropriate
preset button.
You can load a disc(s) in any mode
(AM, FM, XM, or AUX) if you do not
select an empty position.
You cannot select the empty position
if there is no disc in the changer.