G Sensor (4WD Models Only)

The G sensor senses deceleration during braking to determine whether the vehicle is being driven on a high mu road (asphalt road, etc.) or a low mu road (snow-covered road, etc.). It then sends a signal to the ABS control unit.

Fig 1: Identifying Reed Switch Operation And G Sensor

Courtesy of NISSAN MOTOR CO., U.S.A.

The reed switch turns on when it is affected by a magnetic field. During sudden deceleration (braking on a high mu road), the weight moves and the magnet in the weight moves away from the reed switch. The magnetic field then diminishes and the reed switch turns off.