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Originally Posted by TKCamry
The software is made by Denon(a Japanese corp) and the version is 5.1.
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Actually the company is Denso and YOUR version can be obtained in the setup information on the navigation display. It may take a few screen presses but it is displayed there. Most TCH were delivered with version 5.1 and that means 2005 version 1. This much I have determined. I believe the Lexus has the same version.