A Honda radio security code is an anti-theft PIN—typically a
5-digit security code for standard audio units or a
4-digit PIN for navigation systems—that locks the infotainment head unit whenever electrical power is completely cut off. Disconnecting or replacing the vehicle battery resets the audio unit memory but does not erase the security program; instead, the loss of voltage triggers an automatic anti-theft lockout that requires re-entering the numeric security code to reactivate the sound system.
