ABS Brakes

I have a 1999 Silverado. I applied brakes on and icy road the other day and the ABS pump that is on the frame rail stayed running. I pulled the fuse out and it stopped. What would cause this and is there a fix or do I need to replace it. I am thinking it may be froze due to the cold weather. I will try and heat it up this weekend but if any one has any ideas what or how to fix it let me know.

Thanks
Labatt

The ABS module is bad. Do not go to the dealer as this is a $1000 job. Go to modulemaster.com. Gavin will have it back to you in a day if you want. It cost me about $175 shipped to the door and the problem has been fixed.