I can't see spending $380 for lexus to update the nav. I might be able to find the disc someplace but am kind of skeptical of ordering things from eBay or other re-sellers. I have heard there are a ton of bad discs that are sold.
My friend game me the image and I re-burned it in DVD-ROM mode. It seems to read now in the ecu!
At this point I just want to know how to reset the navigation... and start all over
I will post what I find out... But any help is appriciated.
I can't say this will be true for your LS 430, but for my 2004, I tried pulling ECU fuses and that didn't work. When I pulled the battery negative cable off for a few minutes, then restored it, the nav system re-loaded. Apparently, there is another power line going to the ecu (to maintain the memory) that doesn't go through the indicated ECU fuses in mine. Maybe yours?
I was worried I'd loose a bunch of memorized settings throughout the car, but only lost the previous destinations list. Not bad.
Hope this helps.