G Sensor
WARNING: This page is about a different car, the 2017 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
The G sensor has a semiconductor acceleration sensor and detects longitudinal G and tilt angle of the vehicle based on gravitational acceleration.
 Courtesy of NISSAN NORTH AMERICA, INC.
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In addition, the G sensor converts a detected tilt angle into an electric signal and transmits it to ECM.