My rear defrost does not work on 2008 Chevrolet Impala

The switch light comes on, the fuse is good, I have voltage at the terminal on the right of the rear window and the left side is grounded,and I even read voltage across the defrost wires in the glass and at the ground terminal. ?????

Asked by for the 2008 Chevrolet Impala
Unhook wires and read resistance across the grid. I dont know the value but has to be enough to generate heat! Can't be 0 nor infinite and still work.