It's a momentary switch. But it should light up.
It *may* be that the little LED is burned out in the switch body, so check
that the defroster is actually working before tearing into the switch. Turn
the switch on for a bit, then fog up the window with some breath and see if
it clears up first around the wires.
If nothing works, then it's the switch itself.
Thanks. I'll check that out.
I was looking at the wiring diagrams and it looks like the ICU has nothing
to do with the rear wiper/washer. I hadn't tried either in a while so it may
be an occasional problem with the switch or the relay. The ICU does affect
the intermittent function of the front wipers, and the new capacitor
definitely fixed that.
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