Brake Switch
WARNING: This page is about a different car, the 2003 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
When brake switch is pressed, PCM receives an input that the brakes are being applied. After receiving this input, the PCM will control idle speed using the Idle Air Control (IAC) motor. This input is also used to disable vent and vacuum solenoid for speed control servo.