The fuses and relays connected to this circuit should be tested with a volt/ohm meter, not visually. If those two components are both good, and current is passing through them, you have to trace up the wiring to the actual component. I think the rear defogger can be tested easily with a volt meter but the side mirrors might require some disassmbly to test whether current is getting to them.
If both these items are on the same circuit, one would suspect relays, fuses and wiring rather than the item itself.
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