The screen went black. A progress bar appeared:

. The code is often printed on a small "Security Code" card or written in the "Audio" or "Security" section. Glove Box/Console

If your car radio is showing a "SAFE" or "LOCKED" message after a battery change or repair, you aren’t alone. Most factory-installed audio units come with anti-theft security that requires a unique 4- or 5-digit code to restart. While dealerships often charge high fees for this service, using a can get you back to your music for free or a fraction of the cost. What is a Car Radio Universal Code Calculator?

The screen flickered. A progress bar crawled across the bottom. For twenty-four seconds—hence the name—the program crunched the hexadecimals. Elias held his breath. If the code was wrong, the radio would "brick," locking itself permanently to prevent theft. The timer hit zero. His fingers hovered over the radio’s preset buttons.

WARNING: NOT A UNIVERSAL CODE.

Instead of risking your computer with sketchy software, try these "better" methods first.

Ensure you've selected the correct brand, as algorithms vary wildly between a Blaupunkt and a Sony unit.

If your car radio is locked after a battery change or power loss, you can typically find the unlock code using free online calculators or mobile apps by entering your radio's serial number Recommended Free Code Calculators Radio Code Generator Unlocker : A free app on Google Play