When you disconnect the battery:
While this is excellent for security, it is a nightmare for legitimate owners. Car manufacturers often bury the code in the owner's manual (which is easily lost) or tie it to the vehicle identification number (VIN), requiring a costly trip to the dealership to retrieve.
For millions of drivers, this is a frustrating reality. Car manufacturers install a security feature called . If the radio loses continuous power (from the battery), it assumes it has been stolen. To unlock it, you need a unique 4-to-6-digit numeric code.
