Hello welcome to just answer I am master tech and will be able to assist you today.
does the navi disc have a ring on the surface ?
No it doesn't and I also tried an upgrade version disc and does the same thing
ok then the navi unit has to be sent in for service
the reader in the navi unit is failed
Can I send it in myself or do I have to go thru a dealer.
yes you can
let me get the info for you
call alpine electronics 1=800-421-2284 ext 860304
they will give you all the info you need to send this in for repair
Do you have any tips on removing the unit.
the only tricky part is removing the liner in the trunk.
you will see the cargo net mounts once these are removed the liner can be pulled to allow you access to the navi unit.
then remove the 4 screws and unplug the unit and then remove it from the bracket
they never ship the brackets back so remove it before sending it out
Thanks for your help