After you try that unplug the unit and
let it rest for 30 minutes then reconnect
the power cord. Install disc.

Also additional info on your vehicle would help.
The other thing is, depending on the year
I believe the unit in the back is a DVD not a CD.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….