sensor?

I have a 01 gti vr6 i was driving it the other day and the abs suddenly came on. i looked under the car and i found a (sensor maybe) unpluged the wires are put together with the horn i mean they travel to the same location on the driver side. do you know what this is and if so where does it plug into?
P L E A S E H E L P:banghead:

The only things over there are the horns, ac control module, and exterior temp sensor. IF the abs light came on you need the codes read or cant really help. Might need a brake light switch there is a new recall for it (n4) your car may apply to it. Call the dealer and have them check