2004 Jeep rain sensing wipers continue to run regardless of setting or amount of rain

A couple of thoughts:
Has your windshield just been replaced?
The sensor is up by the rear view mirror, is it plugged in all the way?
Do you have the right size wiper blades on your vehicle? (too short of a blade misses the rain sensor and does not wipe it clean)
How good are your blades? ( as above, to turn off the rain sensor the blade needs to wipe it clean)
The rain sensor works by projecting multiple inferred beams to the inside of the windshield, like a prism, they reflect back to collectors. when there is a water droplet on the outside of the windshield it changes a beams trajectory and it misses the collector thust turning on the wipers.
(yes, this all happens in that little sensor up by the rear view mirror.)
check to make sure the wiper switch is in the right position.
also....I've seen rain sensors not work properly when the hood or doors are open.
hope this helps