Towbar beeping! Has anyone experienced an audible beep from their towbar when indicating? It's only recently started to happen with the caravan is attached. It's a Mrk3 2015 model.When indicating left there is no beep (and both the car and the caravan indicators work fine), but when indicating right there's a 'beep, beep, beep....' sound and the caravan right indicator does not work. The car indicator still works.From what I've read briefly in other forums, I understand I shouldn't be getting a beep at all if the correct electronic system specific to the Santa Fe was fitted with the towbar?