I never heard of it being bound to the chassis number.
The code is programmed into the Radios memory.
You can record the chassis number in the radio using this access code so
that if its stolen the recorded chassis number is displayed.
This is probably where the idea of it being bound to the chassis originated.
those nice people at form have a big database of every car that has ever
rolled off the production lines.
in the database is info about the car, paint colour, interior trim, trim
level, lock codes etc.
also on the data base is the original radio unlock code, thats the only way
the code is "bound" to the chassis.
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