Kudo's to you guys for having such a great messageboard! I just bought a well used '90 LS400 that is in decent shape. The door locks, interior lights, and stereo didn't turn on for some reason. Checked all the fuses and then did a search on this board. Another fellow had it be a blown "dome" fuse up in the engine compartment. That fuse 'looked' fine in my case, but evidently it wasn't. Replaced it, and everything is working (except for a few burned out interior light bulbs). You guys just saved me a trip to the repair shop.
Thanks again!