I have a '04 GX 470 and am looking to purchase a DVD on e-Bay to upgrade the current navigation system (ver 03.1). Before I do, I wanted to look into how to install the upgrade to my system but am having difficulty locating the information. Can someone please help me out ? Thanks.

 

here

page 13

 

Its very easy takes about 5-7 minutes. I did it on mine. I have 2004 too. Just put the DVD under passenger seat into the drive. And follow basic instructions.