I found this override on this site, and it worked for me on my 04 GX. The only thing is you have to do it each time you restart the truck, but it can be done at anytime.
Start the truck
Hit I agree
Press Menu
Hit DVD at the top
Press the lower left side of the screen (nothing will be there)
Press the upper left side of the screen (again nothing will be there)
Press the lower left again
Press the upper left again
Press the lower left one more time
Press the lower right
If done correctly a new screen should pop up
Press and hold override for about 5 seconds until it beeps
Hit the back button and you should be good to go.
I havent touched any of the other buttons in the override screen for fear of breaking something. So give it a try!
Navigation Override
in 03 - 09 Lexus GX470
Posted
LadyLexs' solution worked well for me. :