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BMW TSB #B520217
2015 BMW M3
TSB Document:
Affected Component: SEATS
- Summary
- ?SERVICE ACTION: CHECK PUMP FOR BACKREST WIDTH ADJUSTMENT . The backrest width adjustment and, the lumbar support adjustment of the front seats (vehicles without option code 7MA: Competition package) are accomplished by a common air pump. There may be a decrease in pressure in the door-side backrest and /or the lumbar support without any user input. The plug connection between the air pump and the door-side backrest width adjustment or the bottom lumbar support may be leaking.
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