I bought an old. Cd-player ask pin code and I don´t have it. Car dealer don´t know it as well former owner. How I can get it.
Serial number is: 10497454

I'd get my money back from the people that sold it to you.

You will have to call JVC and see what they say. According to the manual the unit is disabled by a password that is user set.

Using The Security Lock; Registering The Password - Jvc KD-LX3R Instruction Manual [Page 38]