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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 id10200234
Published by NHTSA2021-08-09
Manufacturer's numberB520121
Manufacturer's date2021-06-01
NHTSA componentSEATS; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY

NHTSA's summary

Front seat will not calibrate/initialize, and the stored faults cannot be deleted

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

Equipment and accessories, 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
20V5140002020-08-27. EQUIPMENT:OTHER:LABELS; TIRES
19V1350002019-02-27. SEATS
20190702019-02-14. Seats And Restraints
19V0960002019-02-13. SEAT BELTS; SEATS
18V9180002018-12-19. EQUIPMENT:OTHER:LABELS
18V6520002018-09-20. EQUIPMENT:ELECTRICAL
17V4810002017-07-28. EQUIPMENT

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.
B6127232024-04-01. Service bulletin. The original Conditioned Based Service (CBS) Key data point closed with 23-07 soft ware, all CBS systems are now collectively under analysis.
B5115202024-04-01. Service bulletin. Deactivated: Currently investigating other components that maybe playing a factors besides what is mentioned in the SIB. Topic is under investigation.
B6607202024-03-02. Service bulletin. The functionality of the left rear SRR sensor could be reduced which would display the Driving Assistance Check Control Message.
B6608202024-03-02. Service bulletin. The functionality of the right rear SRR sensor could be reduced which would display the "Driving Assistance"- Check Control Message.
B6105242024-02-01. Service bulletin. The Central Information Display goes black intermittently due to resets of the Head Unit (HU-H3). FaultB7F8F9 â“ âHU-H: Resetâ will be stored in the HU-H3.
B5413192024-02-01. Service bulletin. The roller sunshade (aka sun protection or sunblind) of the front panoramic sunroof is bunching up during operation or may hang down and appear loose.