Don't worry too much about it. It's a common defect in the seatbelt socket (it has a switch in there that's flaky in E36s) that causes your airbag light to stay on. I had my switch repaired and the light reset at the dealership for about $18...free if you're still under warranty. Have it checked and diagnosed by the dealership or an autoshop that specializes in BMWs. They have a Peake Research tool that diagnoses all the warning lights on your dash. It may be a good investment to buy the tool yourself. Good luck!
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