Genuine Daikin 4016495 Sensor Wiring Harness is the pre-made loom that connects the unit's sensors to the control board, carrying their signals through the right plugs and lengths. When it is damaged, a sensor reading can drop out or read intermittently, and the unit can behave unpredictably. A genuine harness connects the way your Daikin expects, with the correct plugs and fit — where a non-genuine part can sit loose or wire wrong.