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Service bulletin B520720

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 id10182616
Published by NHTSA2020-11-16
Manufacturer's numberB520720
Manufacturer's date2020-10-01
NHTSA componentSEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER

NHTSA's summary

SEAT HEATING NOT ACTIVATED WHEN ENGINE IS STARTED USING REMOTE STARTING SYSTEM: When preheating/precooling the vehicle via the remote starting system (Remote Engine Start), the seat heating on the driver's side is not activated.

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 330E2021
BMW 330I2019, 2020, 2021
BMW 840I2020, 2021
BMW M235I2020, 2021
BMW M340I2020, 2021
BMW M82020, 2021
BMW M8 GRAN COUPE2020
BMW M850I2019
BMW M850I2020, 2021
BMW M850XI2019
BMW X52019, 2020, 2021
BMW X62020, 2021
BMW X6 M2020
BMW X72019, 2020, 2021
BMW Z42019, 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
23V2110002023-03-29. SEATS
20225012022-09-07. Seats And Restraints
22V6700002022-09-07. SEATS
20214482021-07-21. Seats And Restraints
21V1560002021-03-10. SEATS:MID/REAR ASSEMBLY:HEAD RESTRAINT
20201162020-03-19. Seats And Restraints
19V6000002019-08-14. SEATS
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
B5211252025-08-24. Service bulletin. If the seat ventilation is deactivated via the switch or due to parking the vehicle, the fans in the seat cushionor under the seat cushion surface are unpleasantly loud. The fans speed up loudly twice and then turn off. The functionality of the fans is not impaired. This behavior only occurs after the vehicle had been programmed to I level S18A- 25-07-520 and higher; upto, but not including S18A- 25-07-551.
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.