1999 Ford Windstar ABS HCU

Hi guys,
My 99 Windstar is throwing the C1095 code. The light clears when I shut off the vehicle but as soon as I approach 15 mph, it lights again and disables my ABS (I can hear the ABS engage briefly just before the light comes on). I had a bad wheel speed sensor also which I changed and now all are working in sync but the vehicle continues to throw C1095. I checked pins 8 & 24 and both seem to be good grounds b/c they light my test light when going from pin 9 to either of them. They do give strange readings tho'. Scale always changes to M Ohms? Pin 9 definitely has 12 V (I haven't checked 25 yet with the ignition on). When I attempt a self-test with my buddies scanner, I can hear the ABS motor engaging over and over for about 30 seconds but then it aborts the test and says "unable to complete self-test, check cable connections". When the vehicle is on the hoist it will never throw the code despite accelerating well past 20 mph. Where do I go from here? I am still hoping I don't have to change the whole HCU.