My '04 Avalanche did this, and it turned out to be the door/mirror connector
that became loose. It was on warranty, but the dealer told me it would have
been a cheap fix. Won't be a fuse...both would be dead.
Had the same problem myself on my '03 Silverado - still under warranty,
the dealer replaced the entire mirror - recently happened again and am
awaiting the mirror to come in for them to replace it. Power mirror and
LED turn signal work fine, just no defrosting - bla.
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