Acceleration Sensor: Description and Operation

The acceleration sensor detects vehicle vertical acceleration. The sensor has a piezoelectric ceramic disk supported at its center. When the vehicle accelerates, the ceramic disk flexes and the piezoelectric ceramic generates an electrical charge. The electrical circuit converts this electrical charge into voltage proportional to the acceleration, and outputs it to the ECU.

There is an acceleration sensor inside each front height control sensor, and one at the right rear. The deceleration of left rear is inferred from the data of the 3 sensors.