ABS light came on today, code 10

[NikFu S.]

Searching helpe me find out how to get the code, but beyond that I have no idea whta's going on.
Here is the desription of a code 10:

Faulty valve relay or broken or shorted harness circuit
Faulty valve relay or broken or shorted harness, or interrupted ABS (causing brakes to function as a conventional brake system)
Unidentified fault that is not equivalent to trouble codes 1 - 16

Is there any way I could narrow it down?

No trouble last night when I parked.
This morning I turn it on, ABS light all day. Brakes are functioning normally.
This may be unrelated, but it was really warm today, some places are covered in pure ice, and my AWD seems to be intermittently kicking in stronger than the past few days.

Either way if it snows again I may be in trouble despite the fact I almost never use the ABS.
I did test it though, so it was functioning perfectly a few days ago. Brought me from 30 to 0 in like 10 feet in snow.

I don't know what a valve relay is, I don't know what the harness circuit is, and the other stuff is just really vague.

Ideas?

The SVX gods must not want me to get rims this spring, with all the stuff that keeps happening to my baby.