If any of you were wondering how the 'Passenger seat belt' alarm is triggered only when there is a person in that seat, there is a pressure sensor located under the seat that is used for this purpose. Reason I came across this was because I saw a note on the manual warning not to keep any articles in the rear floor that may roll under the seat as it "may interfere with the under the seat sensor". I got excited for a second thinking it was a sensor used for advanced climate control in the RDX...