How do you reset a dadio error code on a Honda accord?

I assume you meant radio error code. -be careful- ... the dealer you got the Honda from will have a code you need to type into the stereo to unlock it. I believe you get six attempts?? .. entering in enough incorrect codes your stereo will litterally melt/self-destruct itself. Get this code from the dealer and store it in a safe place. Anytime you change your battery or the stereo gets disconnected you will need to re-enter that code or you'll junk the radio.

Hope that helps.