ASC light...NO ABS light.

Yes I've searched, not a whole lot of info regarding the ASC light staying on but the ABS light remains off. I just bought a 98 528 and during the few test drives the light wasn't on, but go figure the following day when I start her up the light stays on. This was a private party purchase, so no dealer to yell at. I'm on my own on this, but this isn't my first bimmer nor will it be my last.

As stated, the ABS light isn't on and the speedo works fine, so from my reading that tells me that more than likely my wheel speed sensors are working. Does that leave just the ASC control module? Any suggestions as to where to start?
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