Problem solved! I spent a while checking all the sensors, and wiring. I found that the RF wheel speed sensor was not receiving 12V power on the brown wire, which it needs, and thus determined the replacement controller was bad. BBA Reman sent a replacement, and all is well. If anyone needs instructions on how to test the wheel speed sensors, here you go. it's not hard. The S80 uses the newer magneto-resistive type sensors.
http://www.asashop.org/autoinc/aug2001/mech.htm
Thanks for all your suggestions.
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