You could have the switch checked out or replace it. Your fuse box location is either on the driver's side underneath the dash or behind the battery under the hood. Take the cover off and look, there should be a legend for all the circuits of the car and what they control. If the switch is fine, and the fuse is fine, then it could be at the window where it makes contact, they can break and cause it not to work.
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Rear Defroster not working!! 
