{"nhtsa_id":10146586,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-05","date":"2017-03-01","document_id":"B520217","mfr_campaign":null,"replaces":null,"component":"SEATS","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10146586-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10146586-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10146586","components":[{"id":"seats","name":"Seats","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BMW","model":"M3","year_from":2015,"year_to":2017,"match":"exact","vehicle_ids":["2015_bmw_m3","2016_bmw_m3","2017_bmw_m3"]},{"make":"BMW","model":"M4","year_from":2015,"year_to":2017,"match":"exact","vehicle_ids":["2015_bmw_m4","2016_bmw_m4","2017_bmw_m4"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}