Brake Pedal Stroke Sensor

It changes voltage according to brake pedal depressed amount and sends the signal to pre-crash seat belt control unit.

Fig 1: Identifying Brake Pedal Stroke Sensor
Courtesy of NISSAN NORTH AMERICA, INC.
There are 2 signals (brake pedal stroke sensor 1 and 2) sent from the brake pedal stroke sensor. Pre-crash seat belt control unit judges the stroke amount and the speed of the brake pedal according to the voltage of the signal sent by each side.