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2003 Nav Update

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I just picked up a gen 3 Nav DVD to upgrade my 2003 GS300 original navigation. First, where is the nav ECU? I have read that it is on the trunk and also behind a panel in the dash. Also, when I do find it, do I just remove the old DVD and insert the new one and it does the rest? Just want to make sure I get all the steps right. -Thanks for any help!-

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