When I had ABS light problems in our '90 744 TI, the tech worked under the hood, under the left side of the dash, and in the left side of the trunk - he left the covers off unless I needed more trouble shooting.
In my case, the ABS light was off about 90 percent of the time, but if I hit a bump just right it came on. It always was off upon the next start-up.
We never did find the problem - even after he installed the ABS unit from his own car!
Neither I, nor the next owner worried about the light as the brakes performed properly when the light was on.
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