Where is the fuse box located to a 1991 Toyota Previa?

There is a little button or latch in the center of the cover underneath the rim. One needs to just feel under the edge and it is obvious when touching it. The cover also covers the two speakers if there is a multi-speaker stereo so it is easy to identify that way. As the first author said just lift up and back (the rear of the van) and it will come off directly.

If this is the same as a Tarago in Australia (and I think it is) then it is in the centre of the dash. To access it you need to lift the cover - there is a small lug above the heater controls - press this lug and the cover lifts up and there are the fuses.