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A previous post from ScottRoy: 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.