Yes, Toyota VINs starting with "J" are built in Japan...
Typing in "vehicle id number decoders" in a search engine yielded this resource:
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Mike CHi All:
> I wonder anyone knows what is the meaning of the first letter of the VIN
>number. Is the VIN number started with J means the vehicle is made in Japan?
>I was told with different meaning in the dealership so I need some expert to
>tell me the truth.
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>Thanks
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Mike C