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When you disconnect your battery and then reconnect itagain, it disables the radio. This is an anti-theft protection for your carradio. The enable your radio the activation code is in your vehicle owner's manual. Ifyou do not have this code you need to go to your Volvo servicecentre and get them to enter this code for you.
When you disconnect/replace a car battery, your radio anti-theft security system will be triggered: consult your car user manual on how to reset the anti-theft security for your particular radio/audio system: you will need to enter a specific 'security code' that should have been provided when your car or car audio system was bought.
Try to un connect battery, wait 10 minuets and connect the battery. After that you can type in code again. Volvo dealer should have the radio code. The code is writhed in to a computer system on the factory.