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Service bulletin B520121

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10188945
Published by NHTSA2021-03-15
Manufacturer's numberB520121
Manufacturer's date2021-02-01
NHTSA componentSEATS

NHTSA's summary

SEAT FAILS TO INITIALIZE DUE TO MISSING END STOP: Front seat will not calibrate/initialize.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Seats

Vehicles listed
BMW 228I2020, 2021
BMW 428I2014, 2015, 2016
BMW 430I2017, 2018, 2019, 2020
BMW 435I2014, 2015, 2016
BMW 440I2017, 2018, 2019, 2020
BMW 530E2018, 2019, 2020, 2021
BMW 530I2017, 2018, 2019, 2020, 2021
BMW 540D2018, 2019
BMW 540D2020
BMW 540I2017, 2018, 2019, 2020, 2021
BMW 640I2018, 2019
BMW 640I2020
BMW 740E2017, 2018, 2019
BMW 740I2017, 2018, 2019, 2020, 2021
BMW 740LI2016 to 2017
BMW 745E2020
BMW 750I2018, 2019
BMW 750LI2016 to 2019
BMW 750LI2021
BMW B7 ALPINA2018 to 2021
BMW C 400 X2018
BMW F 850 GS ADVENTURE2021 (the catalog's model; the bulletin names a series or trim of it)
BMW F800 R2017
BMW M235I2020, 2021
BMW M52018, 2019, 2020, 2021
BMW M550I2017
BMW M550I2018, 2019, 2020, 2021
BMW M760I2017, 2018, 2019, 2020, 2021
BMW R NINE T SCRAMBLER2018 (the catalog's model; the bulletin names a series or trim of it)
BMW R1200 RT POLICE2017 (the catalog's model; the bulletin names a series or trim of it)
BMW X52019, 2020, 2021
BMW X62020, 2021
BMW X6 M2020
BMW X72019, 2020, 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20225012022-09-07. Seats And Restraints
22V6700002022-09-07. SEATS
21V1560002021-03-10. SEATS:MID/REAR ASSEMBLY:HEAD RESTRAINT
19V1350002019-02-27. SEATS
20190702019-02-14. Seats And Restraints
19V0960002019-02-13. SEAT BELTS; SEATS

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
B7201252026-02-23. Warranty extension. A situation may occur where the front passenger seat is not occupied; however, a “fasten seat belt” warning and a front passenger seat air bag deactivation message appears. If the situation is currently present, sit in the seat and move the seat to a slightly different position. The POL (Passenger Occupancy Light) light should now function correctly. In some cases, the Air bag Warning Light was illuminated, and the following Advanced Crash Safety Module (ACSM) fault is stored: 930A1C - Front passenger seat occupancy detection transmitting fault (moisture)
B5209202024-12-31. Service bulletin. HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN
B5205242024-09-01. Service bulletin. A rattling noise can be heard emanating from the area of the rear seat backrest of the second row ofseats. The noise does not occur when the rear seat backrest is folded down.
B5210192024-04-01. Service bulletin. The seat leather upholstery detaches from the front of the thigh support (aka knee bolster) of either front seat.
B5217232024-02-01. Service bulletin. 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 isfound to have blown.
B5223192023-12-06. Service bulletin. Two areas of the third-row seat backrest that may cause a noise concern have been added.
B5223192023-11-01. Service bulletin. Second seat row blocking access to third seat row, program seat modules. Visible stitching on first row sport seat. Third seat row backrest Bowden cable routing and length change.
B5209202023-11-01. Service bulletin. Various concerns about the third row of seats: 1. Head restraint (aka headrest), on one or both sides, cannot be folded down. 2. Third-row seating, on one or both sides, cannot be folded down.
B5209202023-09-25. Service bulletin. ?Various concerns about the third row of seats.
B5201212023-09-25. Service bulletin. ?The front seat will not calibrate/initialize, and the stored faults cannot be deleted.