Hello,
I have K12 2004 and i also haven't recieved any code, when i bought the car.. Recently i had changed battery and since then my radio doesnt work. I went to local nissan service and they said that they need to disassemble dashboard to check a code on the back of the radio and that will cost around 150 £... So i think this is quite a lot of money just to get the code from the radio and i am asking you if there is any other chance i can make my radio work again? Thank you for all your answers!