i have an 1981 vw diesel pick up that i havent driven for apx.7 years.it has a 25watts x 4 amplier that i bought about ?? 20 years ago which i basicly use a wheel barrel around my building.Please tell me if i need a code or somthing to make the radio work again.It realy was a great radio in the day. and would like to save some gas (diesel) by putting it back on the road Its a cd reciever CDE-7827. my e address is www.cselimos@yahoo.com