I have a 99 Ford contour. Today I was driving it on the ice and snow and the ABS did not work. I also had a mechanic at the Ford garage tell me that the system is not functioning

. The light is not on. They were going to charge 79.00 to diagnose it. I decided to look at the fuses myself but noticed in the book that only a garage should look at that particular fuse. Does anyone have any idea why or what may be the problem. Thanks