I have replaced all of my interior switches to a blue, 3.7 volt, 5mm led and all work fine except for the defrost button. I have been thru two of those lights because for some reason they keep blowing. The soldering was kept to a minimum, so I am sure that its not being bridged, but every time its blown it was after clicking the switch a few times. If anyone out there can help I would really appreciate it. Also, Hope I?m not pushing it but, I was wondering what the empty button next to the defrost was intended for. Thanks again in advance.