You need the original anti-theft code for your radio... period. The "EEEE" code you got is intended to discourage theft. Once you know the code, put the key back in the ignition and switch to the first key position which powers the radio. Go away for a couple of hours, and the "EEEE" will be gone. Enter the correct code per the owner's manual instructions, and you'll be good to go. Write down the code somewhere where you'll find it next time. You could carve it into the dashboard, too - the Volvo radio ain't worth stealing.