Wow, I didn't know that. To be honest, while I was looking for a way to get an aux output for my car without changing the original casette radio, I came across a device called "Yatour" and since it said in the description : "Please note that in some cases a radio security code must be entered after disconnecting the wiring. So keep this at hand." I opened this topic thinking that I might need a code. Thank you very much for your help.