US Toyota-Lexus navigation system generations:In different model year cars, different head unit models had been built in. The navi units' generations are not equivalent with the cars' generations!
There may be overlap between vehicles manufactured in previous years' late part, and the next years' early parts (for exapmple 2006 October, and 2007 February) The years indicated are the years of manufacture, and NOT the year of purchase. For the indentification of the vehicle's year of manufacture, the map discs' ID codes could be useful:
Other sources:
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