Majority of car audio systems have anti-theft security code protection feature. Every time battery of the vehicle is disconnected or audio unit 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.
Sasa, if you lost your Car Stereo Radio / SatNav security codes you can calculate it yourself with these softwares. Follow attached how-to-use manuals attached! Most Car Stereo Radio / SatNav codes are calculated from unit serial numbers OR even chasis number of that vehicle.