?SERVICE ACTION: CHECK PUMP FOR BACKREST WIDTH ADJUSTMENT . The backrest width adjustment and, the lumbar...
BMW technical service bulletin B520217 for 2015-2017 BMW M3 and 2015-2017 BMW M4.
- Bulletin number
- B520217
- 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.
Owners of these vehicles have filed 1 complaints in the seats category.
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