They may test fine, biut replace the, anyway with new ones and clean the
contacts of the fuse holder very well with an ink eraser.

If that doesn't fix it then get a volt meter and trace back to see
why you're not getting any electrons to the fusebox.

As you've noticed the fuses do control diagonal windows.

Same thing happened to me, and it was a not "blown" fuse, but one in
which the aluminum had shrunk from heating of corroded elements causing
the fuse element to heat up causing it to shrink to the point that it
can't carry enough amperage to run the motor any more. They can look
fine and be bad!

Also, when you say that you checked the "main" fuses, if you mean the
fues box under the dash . . . the window fuses aren't there. At least
they weren't there in my car. I found my window fuses in one of the
little rectangular black boxes on the firewall of the engine
compartment. They were near the passenger side of the firewall, and
they were all red fuses in the little black boxes. Check in there and
just replace them all. At this point no original fuse in your car is
really good. They are all too old to be reliable.

All the best - H

I was an English motorcycle guy (think Lucus electrics) before I
started playing with MBs. One of the coolest tools i made was a fuse
tester. I took a 5 amp breaker (about $5 at Napa) and attached two
clips. I could put it across a fuse holder and it would complete the
curcuit without taking out the wirering if there was a dead short. I
actaully made it for finding dead shorts since the breaker would blow,
i would disconnect parts of the circuit until it stopped blowing.
However, for any electrical gemlins, the first thing i do is toss this
across a fuse holder and see if a fuse is bad. If everything works as
it should, then the fuse is bad. Something I do on my MBs, is if one
fuse corrodes, then I change them all out. I have a jar of spares int
he trunk. Quite handy.