One problem related to air bag light on has been reported for the 2009 BMW 535. The most recently reported issues are listed below.
I got a passenger restraint system malfunction: fault in passenger-restraint system affecting airbag, belt tensioner or belt-force limiter restraint problem. This resulted in a red airbag light and red passenger belt to come on the dash and idrive. The passenger restraint system and belt tensioner is said to be bad . This time with a red airbag light on all the time, and the seat belt unbuckled light on as well.
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