The ambient APS gives the ambient pressure data once every second through the CAN Bus to the hydrostatic APS.
The hydrostatic APS calculates the waste level with the received ambient and internal hydrostatic data.
Then the hydrostatic APS continuously transmit the waste level in percentage through the CAN-Bus to the VGMC and the FAP.
In the normal mode the LLS sends the 'Tank Full' signal through the CAN Bus to the VGMC.
If there is a failure of a liquid level sensor, the APS gives the 100 percent- level information to the VGMC. Then the VGMC stops the operation of the related vacuum generator and this waste vacuum subsystem is unserviceable.