I am experiencing the same problem with my Civic. I had to pull out the radio and get the serial # off of the back of the unit. I then called the dealership and they gave me the radio code. Next I disconnect the battery. I usually hold the brake for a sec to drain the systems power completely. Then reconnect the battery. Turn your car on and try to turn on your stereo. It shoudl say COdE. I enter the 5 digit code and it says error 1 then I do it again and get error 2 then 3 etc... until 10. After 10 tries it locks back up and I have to reset the power source again. I'm close but I can't seem to get it. I'm currently in the process of just buying one so because the dealer wants $90 to enter the code.