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Looks like a wire loom to me.
About yous ABS Light. I was told by a mechanic I have used that an ABS light came on and go get the code read to see which wheel it is, that I had bad wheel bearing hubs and I lost the rollers for the bearing and ABS light stayed on because the ring on the wheel bearing housing had broke. Had to replace the wheel bearing assembly and clear the code and no more problems for now. Hope this helps Bruce 2003 Expy EB 4X4
My advance trac light is blinking as well, I have an appointment to get the abs re calibrated since that's the only way to stop it. From what I understand, it has to be a dealership to do the recalibration.