BMW 428I 2014–2015 — technical service bulletin
Bulletin 611514 · NHTSA communication 10148121 · issued Jul 1, 2014
Technical service bulletin
communication type
Electrical System
component
2014–2015
model years
4
vehicle entries
Official summary
Neck Warmer Not Working. The neck warmer function (NWR) is not working and the LEDs in the NWR control element do not light up. The neck warmer functions properly after switching the ignition off and on again. The control unit is located under the rear seat bottom, as shown in the photo, and is clipped into place.SMFA (Seat Module Drivers) fault code E44C21: "LIN bus: Neck warmer control unit does not function" is stored. Note: For the first time, the neck warmer is available as optional equipment (SA4NH) in the Convertible. The neck warmer reduces cold drafts that a customer feels on his or h
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.