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Could be a bunch of different reasons:
1. The "relay" is out.
2. The breaker/fuse is out
3. There is a tear in the grid on the windshield or the grid went bad in general.
4. The switch is not working.
5. Etc etc etc
I had a problem with this in my car (a Chevy) and the dealer was charging $120 for diagnostics on it. You can do you own little diagnostic work to help narrow it down.
Push the defogger switch in and listen for a little click from the relay. It's easier to hear the click if you take the panel off where the relay and fuses are located. If you hear a click then that should mean that the switch and relay are good. Next you might want to check out the breaker. Refer to your owners manual and there should be some diagrams for which fuses are which and what you're looking at in general when you open up the fuse box. You can try replacing the relay ($10 at AutoZone) or some other fuse which may be related to it for very little money.
You can also test the connection to the grid with a voltmeter and see if any current is running there. Having a little knowledge of electronics can really help save you a lot of money in this situation because you can use your voltmeter and try and pinpoint the problem yourself. Good luck!
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