ASCD Brake Switch: Description
WARNING: This page is about a different car, the 2009 Nissan Murano. 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 of the brake pedal by this input of two kinds (ON/OFF signal).
Refer to "SYSTEM DIAGRAM " for the ASCD function.