The mutli function switch is a possible cause of failure. Do you hear the pump come on at all? When you push the washers with the wipers set to OFF, do they cycle as if to wash the windshield (without the fluid of course)?
OK, if you hear the pump and the wipers cycle, you ruled out the switch. You almost certainly have a disconnected line. Check ALL the unions and junctions from the washer reservoir up to the washer jets. The pump is very simple and if you hear it working, it typically is.