# 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.

- Type: Service bulletin
- NHTSA id: 10182616
- Published by NHTSA: 2020\-11\-16
- Manufacturer's number: B520720
- Manufacturer's date: 2020\-10\-01
- NHTSA component: SEATS: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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182616-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182616-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Seats

## Vehicles listed

- 2020 to 2021 BMW 228I
- 2021 BMW 330E
- 2019 to 2021 BMW 330I
- 2020 to 2021 BMW 840I
- 2020 to 2021 BMW M235I
- 2020 to 2021 BMW M340I
- 2020 to 2021 BMW M8
- 2020 BMW M8 GRAN COUPE
- 2019 BMW M850I
- 2020 to 2021 BMW M850I
- 2019 BMW M850XI
- 2019 to 2021 BMW X5
- 2020 to 2021 BMW X6
- 2020 BMW X6 M
- 2019 to 2021 BMW X7
- 2019 to 2021 BMW Z4

## Recalls for the same vehicles and component

- [23V211000](/recalls/nhtsa/23V211000.md), 2023-03-29: SEATS
- [2022501](/recalls/tc/2022501.md), 2022-09-07: Seats And Restraints
- [22V670000](/recalls/nhtsa/22V670000.md), 2022-09-07: SEATS
- [2021448](/recalls/tc/2021448.md), 2021-07-21: Seats And Restraints
- [21V156000](/recalls/nhtsa/21V156000.md), 2021-03-10: SEATS:MID/REAR ASSEMBLY:HEAD RESTRAINT
- [2020116](/recalls/tc/2020116.md), 2020-03-19: Seats And Restraints
- [19V600000](/recalls/nhtsa/19V600000.md), 2019-08-14: SEATS
- [19V135000](/recalls/nhtsa/19V135000.md), 2019-02-27: SEATS
- [2019070](/recalls/tc/2019070.md), 2019-02-14: Seats And Restraints
- [19V096000](/recalls/nhtsa/19V096000.md), 2019-02-13: SEAT BELTS; SEATS

## Other bulletins for the same vehicles and component

- [B521125](/bulletins/11022110.md), 2025-08-24, Service bulletin: SEATS; ELECTRICAL SYSTEM. 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.
- [B520920](/bulletins/11012089.md), 2024-12-31, Service bulletin: SEATS. HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN
- [B520524](/bulletins/11006735.md), 2024-09-01, Service bulletin: SEATS. 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.
- [B521019](/bulletins/10252279.md), 2024-04-01, Service bulletin: SEATS. The seat leather upholstery detaches from the front of the thigh support \(aka knee bolster\) of either front seat.
- [B521723](/bulletins/10249023.md), 2024-02-01, Service bulletin: ELECTRICAL SYSTEM; SEATS. 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.
- [B522319](/bulletins/10246302.md), 2023-12-06, Service bulletin: SEATS. Two areas of the third\-row seat backrest that may cause a noise concern have been added.
- [B522319](/bulletins/10244258.md), 2023-11-01, Service bulletin: SEATS. 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.
- [B520920](/bulletins/10244257.md), 2023-11-01, Service bulletin: SEATS. 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.
- [B520920](/bulletins/10242695.md), 2023-09-25, Service bulletin: SEATS. ?Various concerns about the third row of seats.
- [B520121](/bulletins/10242694.md), 2023-09-25, Service bulletin: SEATS. ?The front seat will not calibrate/initialize, and the stored faults cannot be deleted.

JSON: [/v1/bulletins/10182616](/v1/bulletins/10182616)

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