I assume you are refering to the circuit which requires you to depress the brake pedal to start the car? I'm not real clear.
Anyway, the relay for that is in the lower left side of the underdash. Pull the cover and it's right there above the fuse box. This relay is also part of your OE anti theft system so if you remove the relay then your OE starter kill won't work either. Nonetheless you can simply join the two heavy wires in the relay and voila no more brake pedal crap.
Either that or you can cut the brake pedal feed to the relay and run it to ignition power. That will bypass the brake switch as well.