Hi, Yes I can confirm that the tilt sensor, on my 2014 car, is located under the passenger seat. Just pull out the storage box and seat fully forward will reveal it. The sensor slides off nice and easy and then remove the connector, a small screwdriver helped to release the connector. As Richy says above, mine was getting to be a pain and I had to press the sensor deactivation button in the roof to stop it going off. Now with the tilt sensor removed I don't have to remember to press the button when I leave the car and the car is useable. I looked into to getting a new one but at £295 I decided against it!
Antara 2014 2.4 petrol, now with cruise control