The original manufacturer's security codes for Blaupunkt car radios are found on many websites, including Car Radio Code and Radio Code. The radio's serial number is required, and some websites charge a fee for the security code.
When power is lost to a Blaupunkt radio, the original security code must be entered when it is powered up. Most car dealers include this radio code in the car literature, but if the radio has been replaced, the code may not work on the existing radio. The radio serial number, which is required to find the security code, is typically printed on a label on the top or side of the radio unit.