那个传感器，Hood关上，触点开路。
换言之，只要触点开路，告警灯就不会亮。
The hood sensor is a simple electrical switch. When the hood is closed, the switch is open. When the hood is open, the switch is closed and a warning is illuminated on the dash.
https://www.yourmechanic.com/services/hood-sensor-switch-replacement
