I have a 2005 F-150 the electrical buttons on the panel for the ac, rear defrost etc are not working. However, when the truck is off, the lights on the panel stay illuminated. I turn the key on and there is a buzzing sound from the fuse panel. I removed the cover and found that one of the large grey plugs was making the noise. I removed the plug and the noise stopped. But the lights on the panel stay illuminated. Can you help me?