Hi
First make sure that the code has not been noted somewhere within the car (underneath the ash tray, glove box , rear of sun visor etc)
To see if your code is available here for free then the radio will have to be removed from the dashboard (and if you are lucky, someone may have written the code on the casing ) .
quoting the radio MAKE+MODEL plus ALL the LETTERS+NUMBERS on ANY LABELS, BARCODES or STAMPED IN THE METAL CASING
Also quote the make of the car.
note: Unfortunately not all radios can be decoded using the Serial Number
If not then try your Main Dealer for the code...........or take it into a Decode Service who will plug in a laptop to read/recode the memory chip (EEPROM). This takes a few minutes and shouldn`t be too expensive.
Also check this bellow link….
http://www.ehow.com/how_5992757_change-codes-panasonic-dvd.html
Let us know if you have something more to know else accept the suggestion.
Thank You for contacting Fixya.com