Answers: Wow, these things must be going around. I asked that totally same question yesterday, and I also own a 2003 Limited 4Runner. You can get them from the trader, but you can also buy them on eBay, like this one:
http://cgi.ebay.com/ebaymotors/toyota-le...
Two things:
1. Make sure you gain the "Generation 3" disk. The 2003 nav unit is call a Generation 3.
2. If behind the nav eyeshade you have two disc slots, the lower one is for the DVD. If you hold one slot and a cassette tape, next you load the DVD fund in the reverse cargo nouns on the passenger side. You'll see a little hatch that say "DVD Navigation/GPS" or something like that.
More Auto Questions and Answers...
This article contents is post by this website user, AutoQnA.com doesn't promise its accuracy.