I've noticed a few times that my passenger air bag indicator hasn't been turning on when someone is in the passenger seat, usually my girlfriend ironically. I usually gotta pull over if I'm driving, shut the car off and start it again for the system to recognize that there is someone in the seat. I read in the manual that sometimes it won't activate if there is a 'small adult' in the seat. First off, what classifies as a 'small adult?' Secondly, is anyone else having this issue?