Ok, i know what you are trying to say, but vitz is a widely used car in sri lanka and i don't think that its rare to see a stereo installed after market. Most recondition cars have stereos which replace the originals by sales agents or users (most originals are just Japanese frequency radios). So if that noise is due to that, there may be lot more other vitz users with similar problem. If nobody experience similar thing, then can this noise is due to that or some other reason?????