Well typically HUs just don't blow when running at normal. Yea you can do what JustPostChild recommended and check out the fuse, which i doubt. But yea you got 2 fuse boxes. Check the one under the driver side dash and the one in the engine bay. If the fuses are good, you might have to pull the HU out and check all connections. I'd be looking at the yellow wire. But for some reason I don't think it's the wiring either. I'd hate it if it was the faceplate that blew a short. check it out and post