Don’t waste your time andmoney on the airbag module. I had the same problem with my 545i. I was able tofix it by replacing battery positive cable (SBK).
This cable has a module thatreports to airbag system and this cable is known to have issues.
I replaced the cable with theupdated version that was installed on 550i. You will need also to modify thesmall harness connecting to the cable
Don’t waste your time andmoney on the airbag module. I had the same problem with my 545i. I was able tofix it by replacing battery positive cable (SBK).
This cable has a module thatreports to airbag system and this cable is known to have issues.
I replaced the cable with theupdated version that was installed on 550i. You will need also to modify thesmall harness connecting to the cable