# Service bulletin B520423

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: 10235187
- Published by NHTSA: 2023\-05\-01
- Manufacturer's number: B520423
- Manufacturer's date: 2023\-03\-01
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

The seat module control unit controls the seat functions. A software error can lead to the loss of the initialization function.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10235187-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10235187-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2023 BMW 740I
- 2023 BMW 760I
- 2023 BMW I7
- 2022 to 2023 BMW X1

## Recalls for the same vehicles and component

- [25V395000](/recalls/nhtsa/25V395000.md), 2025-07-23: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION MOTOR:CONTROLLER:SOFTWARE
- [25V470000](/recalls/nhtsa/25V470000.md), 2025-07-16: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [2023561](/recalls/tc/2023561.md), 2023-10-18: Electrical
- [23V700000](/recalls/nhtsa/23V700000.md), 2023-10-18: ELECTRICAL SYSTEM:ADAS:DRIVER MONITORING:CAMERA/SENSOR
- [23V479000](/recalls/nhtsa/23V479000.md), 2023-07-12: ELECTRICAL SYSTEM
- [23V449000](/recalls/nhtsa/23V449000.md), 2023-06-28: ELECTRICAL SYSTEM:PROPULSION SYSTEM:HYBRID MANAGEMENT
- [22V944000](/recalls/nhtsa/22V944000.md), 2022-12-20: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY THERMAL:MANAGEMENT:SOFTWARE
- [22V860000](/recalls/nhtsa/22V860000.md), 2022-11-21: ELECTRICAL SYSTEM

## Other bulletins for the same vehicles and component

- [B611226](/bulletins/11037844.md), 2026-10-02, Service campaign: ELECTRICAL SYSTEM. The BCP controls several vehicle functions, including the windscreen wipers and air conditioning actuators. Low current flow may cause excessive current in parts of the BCP circuit board and damage the unit. If a fault occurs, the wipers or air flap controls may operate incorrectly or fail. A wiper failure is indicated by a yellow warning light and the “Windscreen wiper fault” Check Control message.
- [B120326](/bulletins/11030061.md), 2026-03-13, Emissions: ELECTRICAL SYSTEM. BMW AG is conducting Voluntary Emissions Recall \(effective March 11, 2026\) on certain Model Year 2023 \-2026 BMW vehicles that were produced between January 14, 2022, and September 16, 2025.
- [B640925](/bulletins/11026956.md), 2026-01-05, Service campaign: ELECTRICAL SYSTEM. A faulty electric auxiliary heater may have been installed in the certain vehicles. This could result in thefailure of the electric auxiliary heater, utilized for the vehicle interior.
- [B840625](/bulletins/11024211.md), 2025-10-09, Service bulletin: ELECTRICAL SYSTEM. In some situations, an emergency call may be triggered in the vehicle without either the customer pressing the SOS Call button, or an airbag deployment event. In some cases, the customer may not even be inside the vehicle.
- [B640925](/bulletins/11022362.md), 2025-09-03, Service campaign: ELECTRICAL SYSTEM. A faulty electric auxiliary heater may have been installed in the certain vehicles. This could result in thefailure of the electric auxiliary heater, utilized for the vehicle interior.
- [B651825](/bulletins/11021819.md), 2025-08-13, Service bulletin: ELECTRICAL SYSTEM. When the alarm system is activated and doors are locked, within a short period the doors will unlock, and a “double beep” acoustic confirmation is heard from vehicle.
- [B612024](/bulletins/11021111.md), 2025-07-31, Service bulletin: ELECTRICAL SYSTEM. In the event of a voltage drop, comfort functions of the BMW interaction bar may fail and not respond.
- [B613323](/bulletins/11020915.md), 2025-07-28, Service campaign: ELECTRICAL SYSTEM. The Combined Charging Unit \(CCU\) may not have been built to specifications.
- [B340425](/bulletins/11019563.md), 2025-06-17, Emissions: ELECTRICAL SYSTEM. As a result of a data input error, certain fault memories are permanently stored. The permanent storage offault memories does not comply with the legal specifications of the authority \(California Air Resources Board– CARB\). The fault has no effect on the use of the vehicle by the customer.
- [B120425](/bulletins/11019554.md), 2025-06-17, Emissions: ELECTRICAL SYSTEM. EMISSIONS RECALL 25E\-A02: PROGRAM CONTROL UNITS

JSON: [/v1/bulletins/10235187](/v1/bulletins/10235187)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20B520423&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10235187&vehicle=Service%20bulletin%20B520423)