Hi I have a 2000 Mercedes A140 Classic and I've noticed that on my dash there is an outline of a man in a seat and a seatbelt which has never ever lit up. Just wondering, why has this never lit up before and what is it? I can only presume it's a warning light for someone not wearing a seatbelt. Is the reason that it never lights up because it's not meant to, that my version is only a classic or there is a problem in the system? I've looked in the user manual and there's nothing about that light. Thanks.