You are not wrong, but I think it only applies to OBD2.
There is a harness that runs along the glove box lower support frame. It was starting to wear through the bundle when I inspected this area on my 97 LX450.
There is also a small wire harness that runs along the right (Maybe left. Not enough coffee yet) front frame rail that is secured with plastic clips. When the clips break off, the harness can come in contact with the front drive shaft. As you can imagine, this will cause woe and strife as it wears through.
Another area of concern is the fuel pump wiring that runs under the c-pillar on the drivers side.
Instead of going through a bucket of fuses, you can use a multi meter that has a continuity beep tone. One lead in the load side of the EFI relay socket, the other lead to ground. If you start poking around and doing some percussive diagnostics, you'll hear the beep tone when it shorts.
@musthave Please note that the diagram I gave you in the other thread was from a 1991 fuse block. The later models rotated the EFI fuse socket 90 degrees CCW. The pinouts are identical as are the wire colors.