What is SIB 52 19 23 about?

SIB 52 19 23 is a BMW Service Information Bulletin that addresses problems with the second row 60%/40% split seat flex cable assembly in 2022-2025 BMW X7 vehicles. The issue can prevent the seat from moving forwards or backwards.

Why is my BMW X7 second row seat stuck?

Your BMW X7's second row seat may be stuck because the flex cable assembly has come out of the seat rail mechanism, often due to a foreign object jamming the seat movement. This is a known issue covered by BMW SIB 52 19 23.

Can I fix the BMW X7 seat rail flex cable issue myself?

While the bulletin provides repair procedures for technicians, it involves specific diagnostic steps, part replacements, and careful reassembly. It is recommended to have an authorized BMW service center perform the repair to ensure it is done correctly and safely.

Are there any specific parts needed for this repair?

Yes, depending on the diagnosis, parts such as flex shaft kits (e.g., 52 20 5 A9C 054, 52 20 5 A9C 055), SLV Motor Carrier trays (e.g., 52 20 7497460), mounting kit clips, and seat mounting screws may be required. A BMW service center can identify the exact parts for your vehicle.

BMW X7 Second Row Seat Flex Cable Repair SIB 52 19 23

BMW has released Service Information Bulletin (SIB) 52 19 23, Revision 2, dated March 27, 2025, which supersedes the previous bulletin dated December 2024. This bulletin addresses a common problem affecting the second row seats in certain BMW X7 models, specifically those equipped with a 60%/40% split seat configuration.

Symptoms

Owners of affected 2022-2025 BMW X7 vehicles may notice that the second row 60%/40% split seat is unable to move forwards or backwards. This occurs when the flex cable assembly detaches from the seat rail mechanism, effectively stopping the forwards and backwards travel of the seat.

Cause

The primary cause of this issue is often a foreign object mechanically jamming the seat movement. This obstruction can lead to the flex cable popping loose from its connection points within the seat rail mechanism.

Diagnosis and Trigger Conditions

Technicians will assess the extent of the damage to determine the appropriate repair. The bulletin outlines three main scenarios:

Situation 1: Broken Plastic SLV Motor Carrier Tray If the plastic SLV Motor Carrier tray is broken, it will need to be replaced. These trays are available as part of flex shaft kits.
Situation 2: Damaged Flex Cable If the flex cable itself is damaged, particularly at its end, it should not be reused. Only the damaged flex cable assembly needs replacement, not the entire seat rail assembly.
Situation 3: Loose Flex Cable If the flex cable has simply popped loose from the U-shaped flex shaft hooks without damage to the cable end, the U-shaped hooks on the plastic carrier should be inspected. If these hooks are damaged, the SLV Motor Carrier tray must be replaced. If the hooks are intact, the flex cable can be reinstalled, and a new locking clip should be used.

Important Warnings

BMW advises that a new locking clip for the flex cable will become available in July 2025. Until then, technicians are instructed to reuse the existing locking clip if it is still functional. Additionally, if a flex cable end has been damaged, it must not be reused; replacement is necessary to ensure proper seat function.

Repair Procedure Summary

The repair process involves several steps, starting with identifying the extent of the damage. While the repair can often be performed with the seat still in the vehicle, removing the seat or its coverings may be necessary for better access and visibility. BMW provides video resources, such as "BV52 06 24 Flex Cable Pops Out" and "BV52 07 24 Flex Cable Install," to guide technicians through the process.

The general procedure includes:

Inspection: Locate the problem area of the flex cable drive(s) and identify if a foreign object is present.
Removal of Obstruction: Carefully remove any foreign object that may be jamming the seat mechanism.
Damage Assessment: Determine if the SLV Motor Carrier tray is broken, if the flex cable is damaged, or if it has simply popped loose.
Component Replacement/Reinstallation: Based on the diagnosis, replace the necessary components (flex cable, motor carrier tray) or re-seat the flex cable. This may involve removing the motor for forward/backward adjustment (SLV) if replacing the short flex cable.
Alignment: Ensure proper alignment of the seat rails before final reassembly.
Testing: After the repair, the seat operation must be tested multiple times, moving it fully forwards and backwards to confirm correct installation and engagement of the flex cables in the rail gearboxes.

This Service Information Bulletin (SIB) 52 19 23 also notes that if the seat is removed from the vehicle, the seat mounting bolts must be replaced and torqued according to Service Bulletin B52 23 19.

Required Parts

Depending on the specific repair needed for your BMW X7 seat rail flex cable issue, various parts kits may be required. Technicians will use the vehicle's VIN to determine the exact part numbers. Some common parts include:

52 20 5 A9C 054: Kit flexible shafts (40% seat passenger rear)
52 20 5 A9C 055: Kit flexible shafts (60% seat driver's rear)
52 20 7497460: Drive, Longitudinal seat adjustment (60%) includes SLV Motor Carrier tray
52 20 7497461: Drive, Longitudinal seat adjustment (40%) includes SLV Motor Carrier tray
52 20 5B69BD1: Mounting kit clips
07 14 7424979: (Seat mounting) Hexagon screw with flange

Owner Action

If your 2022-2025 BMW X7 second row seat is not moving properly, it is recommended to schedule an appointment with an authorized BMW service center. They can diagnose the specific cause of the BMW X7 seat rail flex cable issue and perform the necessary repairs as outlined in SIB 52 19 23. Please note that damage caused by outside influences or foreign objects may not be covered under BMW's limited warranties.

Source: NHTSA ID: 11016438