Problems with ABC Active body control

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MY ABC light has been coming on for a couple months. Recently it started to come on every time I drove it. Last week, while the car was stopped at a red light, the red colored abc light came on and a dinging noise started. So I pushed the button that raises and lowers the car, the front drivers side lowered and the passenger rear side rose. Do you know what could be wrong? Also my husband noticed a container that is to the abc, that seems to have a type of oil in it, with a dip stick, that has 2 different notches in it, one half way and one approximately 3/4's of the way. It is half full and the fluid is dark green in color. Is that the way it should be? Which mark should it be up to? What type of fluid is supposed to be in there?