If the liquid is near the low level sensing point, the sensor may energize creating an alert of the fault condition. During vehicle swaying the alert may come on and then go off repeatedly. A wide hysteresis built into the sensor will prevent this. Once the sensor is activated, it must remain on until washer fluid has been added. The specific gravity can vary depending upon the level of alcohol within the fluid. The specific gravity can alter the level of the position of the float within the liquid giving rise to different turn-on and turn-off points.