ASCD Brake Switch
WARNING: This page is about a different car, the 2011 Infiniti M37. 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 those two types of input (ON/OFF signal).
Refer to "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : SYSTEM DESCRIPTION " for the ASCD function.