Airbag not sensing passenger?? 2007
 

At times and very random,the airbaglight indicates that the passengerairbag is off even when there is someone sitting in the passenger seat. This is not weight related as I, 130 pounds, should be turning it on. We took it to the dealer today, and they are looking into it; however, the rental car we are using is now doing the same thing. Could there be some sequence of events that is causing this, and is anyone else experiencing this problem? Thanks