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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 multipleinferred 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
My tahoe has a plastic piece just to the left of the metal attaching arm. It is easiest to see on the driver side wiper. There is just enough room to slip a flat blade screw driver into and then pop upwards. After this clip is popped, slowly move the wiper blade to the right as you pull that clip further upward. The blade can now be removed. Of course if you have a different type blade this will not work.
Raise the rear wiper blade to the position as shown in the
illustration where the meshing of the claw disengages with a clicking
sound. NOTE: Be careful not to break the claw.
Pull straight the rear wiper blade to vehicle's left from the wiper arm. NOTE: Do not fold the rear wiper arm with the rear wiper blade removed from it.
REMOVE REAR WIPER RUBBER
Place the rear wiper with the rear end of the rubber protruded from the blade stopper as shown in the illustration. NOTE: Do not pull out the wiper rubber forcibly, as the backing plates will become deformed or the blade claws will become damaged. HINT: The rubber can be easily pulled out by pushing the middle area of the blade.
INSTALL REAR WIPER RUBBER
Install the 2 wiper rubber backing plates to the rear wiper rubber. NOTE: Be careful to observe and keep direction of curvature for correct replacement.
b. Insert the rear wiper rubber from the claw of the middle of the rear wiper blade into the rear end position.
c. After passing the rear wiper rubber through the rear end side claw,
protrude it from the rear end stopper and pass it through the front tip
remove wiper arms at the shaft, right at the cowl. each will have a nut on them but it is covered by a piece of plastic that will snap up for access. take nuts off and remove wiper assembly. turn key on turn wipers on make sure shafts turn when on, then turn off the shafts to stop in park position. then reinstall wiper assemblies in their park position .