2005 Dodge Caravan ABS Light

Brakes problem
2005 Dodge Caravan Engine Size unknown Wheel Drive Type unknown Automatic 45,000 miles

The ABS light came on in our van about a few months ago and hasnt gone away. We haven't had any issues with the brakes. But I would like to get the problem taken care of. I called the dealership to see how much it would cost to fix and they want $100.00 just to see what the problem is. Well, we don't have 100.00 to toss out there, unless its to fix the problem. Anyway, I was wondering if there is anything we can do to fix it, instead of taking it in somewhere. My husband would really like to fix it himself if he can.