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I'm really hoping someone has the wiring diagrams for early FD's, the ones I can find are for later VIN numbers, the manuals have the starting VIN numbers in the first couple of pages, my 94 model starts 117000 and the wiring is different to the later ones. The windows, horns and fluid level beep (ECU2) all quit. First check was fuses, but the Windows 30A is NOT in the footwell fuse box as all the manuals I can find say, I think its in the engine bay box - NO fuses are blown, so I have a broken feed somewhere I reckon. Tracing the feed wire out by hand is going to be very painful, probably take dash out (ughhhhh), pic of her for interest, she's a 20B :-) This is an old pic, when I was experimenting with home made charge coolers.
That said the beeper is in the CPU#2 and it's possible the CPU is the culprit, they have been proven to be flaky.
I would also pull the front driver's wheel and look up in the wheel arch for rubbing. Actually, since you are RHD, maybe do both wheels. The tires can rub through the fender liner, rub into the wiring harness, break wires, and weird electrical issues happen.
This sounds like the Joint Box. Windows are pretty much on their own from everything else - door and dash harnesses (only going in the joint Box to draw power from a fuse), horn is mostly in the air bag harness, and fluid level is emission to engine to joint box and CPU2.
