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It is Nissan's 4-wheel steering system. Its where the rear wheel detects a hard corning situation at high speeds and turns the opposite direction of the front wheel kinda like this:
left turn:
normal: _----/
hicas: \----/
It is a system to allow you to get more stability and control in corners. It was only available on 91-93 model hatchbacks. It was in it's earlier form then and is not as refined as Nissan's newer hicas systems on the Skyline. Many people feel it makes the car unpredictable around drifts, and high speed corners. It is defeatable. Can't remember how. I believe there are some tie rods you canm connect to the control arms or something. It's been a while since I looked into it.
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