Pulled the whole front bumper off in one move. Help with washer fluid container.

Mach_Crit

Most sensors either read an open circuit or a closed one based on fluid level.

In general, these run a closed circuit using the fluid as a conductor for a low level of power. When the fluid level drops beyond a certain point the current stops flowing as the circuit is now open.

Therefore
closed circuit = full tank = no light
Open circuit = low tank = light on

Try touching the ends of the two cut wires running to the computer and see if your light goes out.

Having said that, I haven't bothered to look at this specific sensor.