I have a 1985 Turismo and I had to jump start it the other day. Since then, the radio has stopped working and when I took it in to an auto repair, they told me it's now in 'security mode' and to check the manual to fix it. I bought the car three years ago and the owner didn't have the manual.

I have a two, three hour trip coming up at night and the radio would be my only source of sound. Please help!