BMW 4 Series 2013–2024 — technical service bulletin
Bulletin B521723 · NHTSA communication 10247576 · issued Dec 11, 2023
Technical service bulletin
communication type
Seats
component
2013–2024
model years
13
vehicle entries
Official summary
Customer states one of the front seats is inoperative. The seat heater and power supply are inoperative .During the vehicle test, the seat module does not respond. The power supply fuse for the seat module is found to have blown.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.