Beatle juice is right. I forgot about the diode, it's probably the first thing you should check. However, on your car you cannot see it by just opening the fuse box. You have to take of the fuse cover 6 philip screws so you can access the rear of the fuse box (put the hood in upright position, it's much easier). You'll see a small gray plug next to all of the silver relays. That's your diode. Snap it open and check if it's burned. You can get it at the dealrship for a few bucks.