Hi Hadley3119,
the ABS unit has 2 parts, one is the mechanical pump, the other is the electronics board attached to it. The relay is part of that. The ABS unit is located under the car. Look behind the frame rail by the driver's door, close to the fuel filter and the transmission brace. Here is what I did 3 years ago with my failing ABS unit: I sent it to modulemaster.com, and am happy with the repair. They have a 5 year written warranty. GM ABS units have undersized electronic parts, and they got replaced with better ones, including the ABS relay. All that for under $200 in 2007.
Take care, Eggert
