I an avic d3 and am getting an error 15 or 17 when I try to load the nav disks. Can anyone tell what these errors are and how to correct? Thanks Charlie

I an avic d3 and am getting an error 15 or 17 when I try to load the nav disks. Can anyone tell what these errors are and how to correct? Thanks Charlie

Look through the manual to determine if those errors are listed. If not, it's safe to assume the disk have become unreadable or the unit is bad.