{"nhtsa_id":11022110,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-08-24","date":"2025-08-21","document_id":"B521125","mfr_campaign":null,"replaces":null,"component":"SEATS; ELECTRICAL SYSTEM","mfr_system":null,"summary":"If the seat ventilation is deactivated via the switch or due to parking the vehicle, the fans in the seat cushionor under the seat cushion surface are unpleasantly loud. The fans speed up loudly twice and then turn off. The functionality of the fans is not impaired. This behavior only occurs after the vehicle had been programmed to I level S18A- 25-07-520 and higher; upto, but not including S18A- 25-07-551.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11022110-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11022110-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11022110","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"seats","name":"Seats","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BMW","model":"840I","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_bmw_840i","2021_bmw_840i","2022_bmw_840i","2023_bmw_840i","2024_bmw_840i","2025_bmw_840i"]}],"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":[]}