I see you use the word "demand" in your post, that is a good way of building a good relationship with your dealer. A pleasant attitude often works wonders when you want help or an explanation. As it happens there was a heavy shower I drove through this morning, both my wipers and lights came on a couple of minutes apart. Excellent as far as I am concerned as there was heavy spray and I would have put the lights on anyway. None of my previous cars would have done this, so the Jazz lights are a bit more sensitive, good news in my opinion, see and be seen. I really can't understand why lights coming on is a big problem.