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2009 chevy
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There is no power to the fuse to the rear defogger under the rear driver side passenger seat.
I don't have the drawings with me, but that might be a bad relay.

Normally, the switch in the dash operates a relay that switches the circuit to the defrost element.

Check your fuse panel covers (or owner's manual) for the relay location. compare the other relays, one might be a match, swap in the 2nd relay to test the circuit
 
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