Remove the negative battery cable for 30 seconds.
Or you can remove the fuse in the under-the-hood fuse panel marked "EFI" for 10 seconds. This works on most all Lexus models from 90-95.
I think you are speaking of the fuse holders. There is one under the hood for several functions, the bigger high amp features, alternator, and so on. Then there is one in the driver compartment, left...