Fuse #8 (10Amp) powers the Rr window defrost relay and Rr window defrost timer.
If it isn't blown, then the defrost relay may be a problem. It is located at the top of the fuse panel (top left one, I think).
You can try swapping it with the lower RH relay, which is the accessory relay, to see if it will work then.
On the rear window defrost switch, is there a light the comes on when it is turned on? If so, does it light?
If not, then I would suspect the fuse. If it does, then the fuse is probably good and the problem would either be the relay or the connection to the rear defrost panel on the window.
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