2021-2024 BMW X7 3rd Row Seat Cannot Fold Down TSB

BMW has released Service Information Bulletin (SIB) 52 09 20, Revision 9, to address a concern affecting 2021-2024 BMW X7 Sports Activity Vehicles (G07 models). This bulletin, which supersedes SI B52 09 20 dated November 2023, provides updated procedures for situations where the 3rd row seat head restraint and/or backrest cannot be folded down. This issue can manifest as a BMW X7 seat fault, specifically impacting the functionality of the rear seating.

Symptoms

Owners may notice that the 3rd row seat head restraint and/or backrest in their BMW X7 cannot be folded down. This condition is often accompanied by noise, indicating a mechanical problem within the seat assembly.

Cause

The primary cause identified for this BMW X7 seat fault is the movement of the 3SR backrest bolt bushing. This movement can lead to the seat components becoming stiff or jammed, preventing them from folding correctly.

Important Warnings

BMW notes that it is not always necessary to replace the head restraint leather cover when performing this repair. Technicians should assess the condition of the cover carefully to avoid unnecessary part replacements.

Repair Procedure Summary

The repair outlined in SIB 52 09 20 involves several steps, including the application of penetrating oil and potential replacement of the LNV motor. The bulletin emphasizes a mobile-friendly repair process and includes new video links and attachments to guide technicians.

Headrest Disassembly and Installation

If the headrest requires removal, the procedure involves:

1. Pulling the headrest strap towards the back of the seat to allow the headrest to fall into a horizontal position.
2. Opening the plastic retainer of the headrest using a flat screwdriver or plastic trim tool, taking care not to damage the headrest.
3. Locating and pressing down on the metal clips inside the headrest foam.
4. Simultaneously pushing the headrest forward to remove it from its rods. This process should be repeated for both sides.

For reassembly, technicians should push the two plastic retainers together, place the headrest into the rods, and firmly push down to secure the metal clips. A final pull from the bottom of the headrest confirms complete installation.

LNV Motor Replacement

For issues requiring the replacement of the LNV (Linear Actuator Valve) motor, referenced by REP 6731635, the steps are as follows:

1. Disconnect the brown electrical connector from the LNV Seat backrest folding motor.
2. Remove the three T-20 screws securing the motor.
3. Firmly grasp the LNV motor and gently rock it up and down to pull it out of the frame. The backrest may also need to be moved slightly to disengage the gear teeth.
4. Inspect the gear tooth assembly for any damage.
5. Ensure the new motor is a correct match and is not damaged before installation.
6. Install the new LNV motor into the seat frame assembly after folding the seat backrest flat.
7. Install the three T-20 mounting screws and torque them to 6 Nm.
8. Reconnect the brown electrical connector.
9. Finally, check the functionality of the seat to ensure the BMW X7 seat fault is resolved.

The bulletin also mentions that distance traveled measurement has been added for the 3SR EKHV actuator and that the Parts and Claim information sections have been updated.

Required Tools or Parts

Technicians will require penetrating oil for application to the Seat backrest bolt and bushing. For LNV motor replacement, T-20 screws are specified for mounting. Specific part numbers for the LNV motor or other components are not listed in the provided document, but the repair instruction REP 6731635 guides the process.

Owner Action

If your 2021-2024 BMW X7 is experiencing a 3rd row seat head restraint or backrest that cannot be folded down, it is recommended to contact your authorized BMW dealership. They can diagnose the issue based on Service Information Bulletin SIB 52 09 20 and perform the necessary repairs.

---

Source: NHTSA ID 11012089