DTC P1572: Automatic Speed Control Device (ASCD) Brake Switch: Description
WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state the brake pedal by this input of 2 kinds (ON/OFF signal).