Hi all, a strange one perhaps. But I have recently noticed that I have an intermittent high pitched electrical noise (I don't know how best to describe it) which sounds like it comes from the passenger side of the car. It is a high, same pitch noise which lasts for a couple of seconds or so at a time and timing varies, but generally seems to do it a couple of times a minute. It's a faint sound, only notice it with the music off. Any ideas?