On some BMW Blaupunkt models, holding the 'M' button or a specific button combination may display the serial number digitally.
How to Get Your Blaupunkt Car Radio Code for Free If your car battery died or you disconnected the radio, you’re likely facing a "SAFE" or "CODE" message on your Blaupunkt display. While many services charge for these codes, you can often retrieve them for free using your radio's serial number. 1. Locate Your Serial Number blaupunkt car radio code calculator free