By having a dealer do a VMI on the car (VMI=Vehicle Master Inquiry), the VMI should list the code. If you have a freindly dealer they should do this for you gratis.
In the case of "the wrecked car" you would need the VIN of the donor vehicle.
In the case of not having access to the donor vehicle VIN, they would need to contact the warranty dept at the radio manufacturer, you might be able to do some of this online yourself.
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