I got a fresh factory loaner when my AP2 (Dec 2016) Model S was getting my headlight replaced (failed DRL). In this loaner (HW2.5), it warned me when my rear seat passengers didn't buckle (and showed how many were unbuckled). My car doesn't do that. I could have the backseat filled with unbuckled teens and it will not alert me. It will alert me to the front seats. Should my car do that but has something disconnected or is that a feature Tesla added after I got my car? In other words, do I need to go back to the service center and get this looked at or am I SOL? (I really want this feature and am willing to pay to change out my seats if need be to get it since safety is pretty much the major reason we got a Tesla).