Rear Defrost Not Working

#1
Hi. I just purchased a used 97 corolla. I notice that the rear defrost doesn't seem to work. The contact clips on the back window seem fine and the element seem intact. The button doesn't light up (should it?) and there is nothing on the dash to indicate it is on/off.
It does have a newer stereo installed...

I also changed the fuse already I think. In the fuse panel it was a 7.5 and the fuse key indicated "fog" so I figured that must be the right one.
 
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