A car radio is one of those devices that you just expect will work when you need it to. Silent road trips are generally not enjoyable. However, if you own an Audi and just replaced the battery, or had some similar maintenance procedure done, you might find that when you turn your car on your radio display says “SAFE” and none of the buttons seem to work. That’s an anti-theft mechanism and to unlock your radio you will need to obtain and correctly enter its security code.
Find the exact model of your Audi’s radio, which is usually printed on the front of the radio. To double-check, either contact your Audi dealer or visit the online list of Audi radios, complete with photos.