How to can I change the screen language in Japanese cars?

I would like to make money buy going to a car dealership that sell Japanese manufactured cars and changing the built-in Tomtoms language. It would be easy but it's all in Japanese! I don't want to be too specific with the car manufacturer but I'll just day for example, Honda. I know that different models have different Tomtoms so I'll just day the Honda Fit and the builders of the Tomtom is something like 'Eclipse'. Can someone please help?

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