BMW 640I 2012–2014 — technical service bulletin
Bulletin M520113 · NHTSA communication 10149467 · issued Feb 1, 2013
Technical service bulletin
communication type
Seats
component
2012–2014
model years
8
vehicle entries
Official summary
Front Seat Lumbar Support Not Working. The lumbar support does not function properly or at all for one or both front seats. CAUSE In most cases, the lumbar knob will rotate with limited or no movement of the lumbar support; this is due to a fractured or broken lumbar support.
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.