Hi, greetings I have the same problem, my car is a Honda Accord EX 1993. my battery dies and have to change, but i cant find the code card. RADIO CASETTE HONDA ACCORD 1993 EX AMERICANO MODEL 39100-SM4-A310-M1 REF CQ-LH1110Z SERIAL 779644 LABEL MA4E00706/8 thx for your help! maybe the phone call works in USA or Can. but here, in Colombia, our "dealers" are not so nice like there. here no phonecall, u have to go, wait until our dealer wants to help u, but he dont give the code inmediatly. you have to fill a form, send to another city and wait 4-8 days for the answer... obvously, this is not free.... in US dollars you have to pay more than 55 bucks for the "service". so.