changoo

I hear a lot about the radio code once you remove the radio and stuff, will I be affected by this in any way by putting in an aftermarket head unit? It doesn't seem that I would but I did notice that my car's key fob quit working and I'll have to check but I don't believe my alarm is turning on or the lights not blinking anymore when I lock the doors since pulling the symphony 2 the other day to see what I was up against. any input is welcomed.