SOURCE: kenwood ddx512
The unlock code usually only goes on if you previously put one on there. I would suggest calling Kenwood but there is a guy that claims he can fix this i have never tried this but you can. http://mike-unlockcodes.blogspot.com/
SOURCE: master unlock code for a kenwood ddx512
my kenwood DDX512 IS LOCK I NEED A CODE TO UNLOCK IT
SOURCE: Kenwood DDX512 problem with IPOD
I had the same problem. Updating the firmware for the Kenwood resolved it.
SOURCE: For The Kenwood ddx512, I
If you have the manual check for it in there. If not listed then I would call Kenwood to see if they will help you over the phone which shouldn't be a problem.
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