Need code for Radio/ CD Player

anytime you unhook the battery on a honda/acura the radio will not come back on until you enter the security code!the radio should say ENTER CODE!if you try and enter a wrong code 3 times,it will lock you out for a while,before you can re-enter the correct code.the radio code is on a little card inside the owners manual in the glove box,and also should be written down in the owners manual, in case the little card is lost.