Side/window Air Bag problems of the 2006 BMW 525

The contact owns a 2006 BMW 525i. The contact stated that the passenger side air bag and seat belt light continuously illuminated. The vehicle was taken to the dealer, where the technician diagnosed that the battery needed to be replaced. The vehicle was repaired, but the failure persisted. The manufacturer was not made aware of the failure. The failure mileage was 108,000.

Had heard from freinds about NHTSA recall 13v564000 regarding the passenger side air bag system on 2006 BMW 5 series sedans and others. I never recieved any notifications from BMW in the mail regarding this recall. In June 2014, the passenger side air bag sensor in my car failed as described in the NHTSA recall notice. I went to the BMW dealer to inqurie about the recall and to find out why I did not recieve a notice in the mail. I was told by the service representative that my particular vehicle VIN was not associated with the recall. I asked the service representative exactly why it was not covered at which he replied "I'm not sure, it's just not on the list". I then proceeded to contact BMW of north America to inquire about the recall. The representative for BMW on the phone basically had the same response as the service representative at the dealership, she was uncertain why my vehicle was not covered and why certain vehicles of the same make, model, and year were covered by the recall. The representative at BMW north America suggested that I contact NHTSA regarding the issue. Please help shed some light on why my particular BMW is not covered even though it has the failure as outlined in the recall notice. In addition, what criteria was used to determine which vehicles and parts were recalled.