Even among Lexus models, there are different generation navigation systems, so the map DVD updates are not always interchangeable. Same for Toyota. (For example, the navigation system in 2001-2003 Toyota Prius is different than 2004-2005 Toyota Prius (Nav Gen. 4), which is different from 2006-2009 Toyota Prius (Nav. Gen. 5), and yet again different than the upcoming 2010 Toyota Prius (Nav. Gen. 6?)... oh, and the navigation on the Toyota Prius has always been touchscreen...)
But yes, the navigation system (company) is the same between the Toyota and Lexus models.
If the same generation navigation system, then yes it will be the same as found in other Toyota/Lexus models with the same generation navigation system.
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