B520920
Service Bulletin Details
Public Details for: B520920
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. 3. Noise from third-row seat backrest when t
- 2023 -
Models from 2023
2023 BMW X7 |
11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN SIB 52 09 20 2023-11-22 HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN This Service Information Bulletin (Revision 8) replaces SI B52 09 20 dated November 2023. What’s New: Two areas of the third-row seat backrest that may cause a noise concern have been added Parts, and Claim Information sections updated Model codes added for new models (TIS filtering) ☐ THIS REPAIR IS MOBILE FRIENDLY MODEL E-Series G07 Model Description X7 Sports Activity Vehicle SITUATION 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. 3. Noise from third-row seat backrest when the vehicle goes over bumps. CAUSE 1. Head restraint (aka headrest), on one or both sides, cannot be folded down: - Head restraint mechanism is faulty. - Bowden cable is not routed correctly, or not mounted. - Bowden cable mechanism (when cable is under tension it is too short) - Electric motor not fully pulling on common housing that moves the 3 Bowden cables. - Seat initialization required. 2. Third-row seating, on one or both sides, cannot be folded down: - Drivetrain for backrest release (actuator) is faulty or internally damaged. - Drivetrain for backrest tilt adjustment is faulty. - Bowden cable not correctly mounted. - Seat initialization required. 3. Noise from third-row seat backrest when the vehicle goes over bumps. - Bowden cable contacts metal seat backrest - Headrest mount moves (weld penetration) CORRECTION Depending on the problem found, one or more of the following corrections will be required: 1. Perform seat initialization. 2. Replace the head restraint mechanism. 3. Replace the Bowden cable. 4. Re-route the Bowden cable. 5. Replace the drivetrain for backrest release (actuator). Copyright ©2023 BMW of North America, Inc. about:blank 1/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN 6. Replace the drivetrain for backrest tilt adjustment. 7. Route the electrical wiring for the seat cable motor behind the Bowden cables. 8. Replace the seat frame assembly. PROCEDURE These networked seats are described in detail in Service Bulletin B52 23 19. In that service bulletin all relevant seat bulletins are listed. Program the vehicle with ISTA to the most recent I-level. NOTE: 1. Software improvements were released August 2019 which changed certain seat operations on early production vehicles. For a detailed list of the changes see Service Bulletin B52 21 19. 2. All G05 / G07 produced up to August 1, 2019, can be updated to 7/2019 software as per Service Action Service Bulletin B65 19 19. After programming perform seat initialization. The seat initialization procedure can be found in ISTA by choosing SERVICE FUNCTIONS BODY SEATS SEAT ADJUSTMENT STANDARDIZATION Then select the correct ABL test plan for the relevant seat(s). You may have to initialize all 4 seat modules. NOTE: The third-row seat is controlled by the second-row seat module. Then proceed as follows: 1. Head restraint cannot be folded down: NOTE: Raising the headrest back into the upright position must be done by pushing up on it by hand. Can the head restraint be manually unlocked using the release loop beneath the headrest (see picture) and thus folded down? Copyright ©2023 BMW of North America, Inc. about:blank 2/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN YES = Head restraint mechanism is faulty. Determine root cause of Bowden cable not moving (see steps below). If the cable is moving fully but the headrest is not folding, then replace the folding module of the head restraint (#2 in picture). See REP 52 30 118 Remove and install/replace folding module of left or right head restraint NOTE: The head restraint cannot be removed without destroying the covering material. A new cover (leather) will be required to perform this repair. NO = Check if the Bowden cable is correctly mounted and properly routed. If the Bowden cable is mounted properly and cable correctly routed and the electric motor moving the common housing pulls all 3 Bowden cables equally but the headrest Bowden cable does not travel far enough, replace the Bowden cable for the headrest (shown in yellow in picture). See REP 52 30 253 Replace Bowden cable for left or right head restraint (Bowden cable unlocking device for head restraint). Cable routing UP TO February 2023 shown. NOTE: A Bowden cable routing change was made in the third seat row backrest. This change was implemented starting in February 2023 production. Replacement parts are all the new shortened design cable and require a new routing to install in vehicles produced prior to February 2023. See Service Bulletin B52 14 23 Cable routing FROM February 2023 shown. Copyright ©2023 BMW of North America, Inc. about:blank 3/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN 2. Third-row seating cannot be folded down: Check if the latch (the fastener on the left or right side) of the third row of seats is open or closed? (this is the hook/pin shown in green in picture) As a quick check for this, proceed as follows: Fold the rear seat backrest of the third row of seats including the head restraint into seating position. This must be done using the button(s) via motorized controls and cannot be moved manually by hand or this will cause damage to the motor for backrest movement. If the head restraint stays in the seat position, the latch is closed. If the head restraint falls into the folded position again, the latch is open. YES (Latch is open) = Replace drivetrain of backrest tilt adjustment. See REP 67 31 635 Remove and install/replace drivetrain for backrest tilt adjustment of third-row seating (left or right) (according to vehicle diagnosis) NOTE: If the seat was moved manually with excessive force, it may cause damage to the internal gear of this actuator. The motor may spin but the seat backrest may not move. In this case replacement of the drivetrain for backrest tilt adjustment is needed and the seat frame would not need replacement. There may be noise from the motor Copyright ©2023 BMW of North America, Inc. about:blank 4/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN if it is internally damaged. To check the gear mechanism, the motor can be removed for inspection. NO (Latch is closed) = Check if the drivetrain for backrest release adjustment is broken? NOTE: The 3 Bowden cables are housed in a common housing that moves along a worm gear assembly. When the electric motor activates, it spins the worm gear to pull up on the housing so that all 3 cables move simultaneously. One of the cables controls the head restraint folding. Once pulled, the headrest will release and pivot downwards. Raising the headrest back into the upright position must be done by pushing up on it by hand. (The other two cables control the latch release at the seat pivot to enable the seat to fold.) For more details see either video: B52 01 19 - G05/G07 Seat Troubleshooting 6 Passenger B52 02 19 - G05/G07 Seat Troubleshooting 7 Passenger Is the drivetrain for the backrest release (actuator) broken? YES = Replace only the drivetrain for backrest release (actuator). See REP 67 31 645 Remove and install/replace drivetrain for backrest release of third-row seating (left or right) (according to vehicle diagnosis) NO = Replace BOTH the Bowden cable(s) and drivetrain for backrest release (actuator). See appropriate repair instruction: REP 52 30 256 Replace Bowden cable for left or right rear seat backrest (Bowden cable for outer backrest release) REP 52 30 255 Replace Bowden cable for left or right rear seat backrest (Bowden cable for inner backrest release) REP 67 31 645 Remove and install/replace drivetrain for backrest release of third-row Copyright ©2023 BMW of North America, Inc. about:blank 5/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN seating (left or right) (according to vehicle diagnosis) 3. Noise from third-row seat backrest when vehicle goes over bumps: The wire harness going to the electric motor for the Bowden cables is supposed to be routed underneath the Bowden cables to keep the cables from vibrating against the back metal panel. If necessary, unplug electrical connector, route harness between Bowden cable and metal seat backrest assembly. Reconnect electrical connector. The metal bracket that holds the headrest assembly is welded to the seat backrest assembly. If any of the welds did not penetrate well this bracket may make noise. Replace seat frame assembly if necessary. Then re-evaluate the vehicle. If parts are replaced as an assembly, all original parts must be assembled to go back for parts return and failure analysis. PARTS INFORMATION To determine the part number that applies to the specific vehicle being repaired, enter the VIN/chassis number into either ETK or AIR. This will consider the specific equipment and/or options that are fitted to the vehicle. Copyright ©2023 BMW of North America, Inc. about:blank 6/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN This is an overview list of parts that may be required to make these repairs. You will only need one or more of these parts to repair the vehicle. Part Number 52 30 7 485 444 52 20 9 473 697 52 20 9 473 695 52 20 9 473 696 52 30 5 A1E 228 52 30 5 A1E 229 52 30 7 941 595 52 30 7 941 592 52 30 9 496 669 Description Bowden Cable Release (unlocking) Actuator folding backrest Drive backrest folding left Drive backrest folding right Bowden cable actuator inboard Bowden cable actuator outboard Headrest leather rear (schwarz) Headrest leather rear (Beige) Folding module head restraint Quantity 2 1 1 1 1 1 2 2 1 CLAIM INFORMATION This Service Information Bulletin provides technical, diagnostic and/or repair-related information. Damage and/or issues caused by outside influences are not covered under the BMW limited warranties. Eligible and Covered Work/Repairs When used to repair a verified defect in materials or workmanship, the applicable repair procedure information that is provided in this bulletin is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks. To submit a claim, please following the established and applicable warranty policy and procedures (Labor/Part/Sublet – bulk materials/qualifying third-party repairs) that apply to the repair being performed. Refer to AIR for the claim-related line item’s Repair Code. For the corresponding repair that was performed, obtain the corresponding labor operation codes and their flat rate unit (FRU) allowance(s), including the diagnosis* that applies. Only one Main labor operation code can be claimed per repair visit. BMW Group’s AIR Application Resource for Flat Rate Labor Operation Codes To obtain the corresponding flat rate unit (FRU) allowance information from the BMW Group AIR application resource, start by entering the Chassis Number (the last seven (7) characters of the VIN, select the applicable Model if two or more vehicle choices show), or enter the full VIN (17 characters), click on the “Search” button. Next, click on the “Flat Rate Units” button and enter the flat rate labor operation code in the field to the right, click “Search” to display the Flat Rate Unit Group detail choices. (*) Based on which one applies to your center, please refer to SI B01 01 20 or B01 07 20 for the applicable procedure for documenting, claiming, and explaining, on the RO and in the claim comments, your diagnosis work time (WT), job/repair work time (WT), and the vehicle repairs your center performed, unless otherwise required by State law. FEEDBACK REGARDING THIS BULLETIN Technical Feedback Warranty Feedback Parts Feedback about:blank To submit feedback for the technical topic of this bulletin: Submit your feedback in the rating box at the top of this bulletin To submit feedback for the CLAIMS section of this bulletin: Submit an IDS ticket to the Warranty Department, or use the chat available in the Warranty Documentation Portal To submit feedback for the PARTS section of this bulletin: Submit an IDS ticket Copyright to the Parts©2023 Department BMW of North America, Inc. 7/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN Supporting Materials Videos 52 01 19 52 02 19 Copyright ©2023 BMW of North America, Inc. about:blank 8/9 11/23/23, 6:38 AM 52 09 20_HEAD RESTRAINT AND/OR BACKREST OF 3RD ROW SEATS CANNOT BE FOLDED DOWN Copyright ©2023 BMW of North America, Inc. about:blank 9/9