In the 1990 Nissan Skyline GTS-T that I have, about 80% of the time when my speedometer reads over 110km/h, this weird ding dong.....ding dong.....ding dong sounds starts ringing. Is this common to all skyline gts-t's? or is there something wrong with my car. Also every once in awhile, when i'm on the highway about 20% of the time, the HICAS light comes on in my dash. what does that mean? I know it's the all-wheel steering thing, but why does the light come on?