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Service bulletin B520518

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 id10145335
Published by NHTSA2018-10-09
Manufacturer's numberB520518
Manufacturer's date2018-07-01
NHTSA componentSEATS; ELECTRICAL SYSTEM

NHTSA's summary

SEAT MEMORY SWITCH SPORADICALLY NOT FUNCTIONING: Selecting one of the saved seat positions (via the memory seat position switch on the door panel), fails to work.

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

Electrical system, Seats

Vehicles listed
BMW 530E2018
BMW 530I2017, 2018
BMW 540D2018
BMW 540I2017, 2018
BMW 640I2018
BMW 740LE2017 to 2018
BMW 740LI2016 to 2018
BMW 750LI2016 to 2018
BMW M52018
BMW M550I2018
BMW M760LI2017 to 2018
BMW X32018

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

Recalls for the same vehicles and component
26V4410002026-07-08. ELECTRICAL SYSTEM:STARTER ASSEMBLY:RELAY
20V1520002020-03-18. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
20193732019-07-31. Seats And Restraints
19V5630002019-07-31. SEATS
18V3230002018-05-16. ELECTRICAL SYSTEM:SOFTWARE; FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
20180482018-01-24. Seats And Restraints
17V7190002017-11-15. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

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)
B7201252025-11-03. 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)
B7201252025-04-18. Warranty extension. The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive Interior Sensor (CIS) Mat for defects in materials and/or workmanship that causes a false seat occupancy alert to occur has been extended to 10 years / 120,000 miles as determined from the vehicle's original in-service / first delivery date.
B7203252025-04-18. Warranty extension. The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive Interior Sensor (CIS) Mat for defects in materials and/or workmanship that causes a false seat occupancy alert to occur has been extended to 10 years / 120,000 miles as determined from the vehicle's original in-service / first delivery date.
B7204172025-04-18. Warranty extension. The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive Interior Sensor (CIS) Mat for defects in materials and/or workmanship that causes a false seat occupancy alert to occur has been extended to 10 years / 120,000 miles as determined from the vehicle's original inservice / first delivery date.
B0116242025-01-23. Warranty extension. The Telematics Control Units (TCU) Internal Emergency (Backup) Battery for defects in materials and/or workmanship has been extended to 6 years without mileage limitation, as determined from the vehicles original first in-service / delivery date. This coverage is subject to the same vehicle eligibility requirements, limitations, and exclusions that apply to the BMW New Vehicle Limited Warranty.
B0118242025-01-02. Warranty extension. The Telematics Control Units (TCU) Internal Emergency (Backup) Battery for defects in materials and/or workmanship has been extended to 6 years without mileage limitation, as determined from the vehicles original first in-service / delivery date.
0110242024-12-31. Warranty extension. The High-Voltage (HV) Battery Assembly Cell Modules Temperature Sensors (Internal NTC repair kit-specific) limited warranty for defects in materials or workmanship has been extended to 15 years / 150,000 miles as determined from the original in-service/first delivery date.
B6404222024-03-02. Service bulletin. An interference noise (groaning noise) can be heard from within the heating and air-conditioning unit in thecenter of the instrument panel. The groaning noise always occurs when either a ventilation flap, air stratification flap or the recirculated airflap moves to a different position. Due to the complex design of the heating and air-conditioning unit, the kinematics causing it (top or bottom,left or right) may not be able to be precisely located. Depending on the vehicle model, the number of servomotors (and the associated kinematics unit) varies.Various models use either 2 or 3 servomotors.
B5108192024-02-01. Service bulletin. The basic conditions for initializing the power windows are not met.