CRUCC

Retrieves your lost or forgotten car audio code through automatic calculations based on the audio system's serial numbers.

Majority of standard fit car audio systems have anti-theft security code protection feature. Every time battery of the vehicle is disconnected or audio is removed, owner is prompted to enter security code in order to activate in-car audio system.
Normally, security codes of vehicle audio systems are attached to the car related documents, owners manual or kept separately as a special car audio information card.
But, there are several cases when vehicle audio system anti-theft security code is not available: audio system is replaced, manuals and code information cards are lost etc.