BMW bulletin B520325
What it saysThe driver’s seat heater doesn’t work after the installation of a replacement seat harness part number (P/N)52 10 7 414 701. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Feb 28, 2025, received Mar 3, 2025, about the electrical system. It names 3 model years (2025). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThe driver’s seat heater doesn’t work after the installation of a replacement seat harness part number (P/N)52 10 7 414 701.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B520325 | Service bulletin | Feb 28, 2025 | 11014658 | PDF, 153 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 52 10 7 414 701 | — | — |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 52 99 000 | Work time to fabricate/install two jumper wires or remove the applicable wires from… | 3 FRU |
Read by machine from the document NHTSA serves (3 pages), read Sep 30, 2026. A part number is shown only where it matches BMW’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 19 complaints with NHTSA since 2015. 6 of them name Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The car has the fast wireless charging tray. I've attached a picture. The case for my phone has a small metal piece on the case. Its a regular case from Amazon. The wireless charger works fine, but it's also heating the metal phone cases to the point where it starts a small fire. Its a huge fire risk if you're not careful.
2025 BMW 3 Series · Electrical System · filed with NHTSA Mar 25, 2025 · ODI 11650648
This is the third Check Engine, Drive train malfunction, Power Supply error messages popped up. Dealership replaced the battery at the first visit, replaced the starter at the second visit. Error messages appeared one week after the second visit to the dealership
2025 BMW 4 Series · Electrical System · filed with NHTSA May 20, 2026 · ODI 11739171
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group69 other manufacturer communications filed against these BMW models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the BMW list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B630526 | Service bulletin | Sep 8, 2026 | After programming the vehicle via ISTA/RSUto I-level …26-03-5xx, customer may reportsome of the interior ambient lighting strips(arrows) may… |
| B652026 | Service bulletin | Jul 23, 2026 | The Central Information Display (CID) side of the Multifunction Display (MFD) may flicker intermittently. Theflickering manifests itself in… |
| B651926 | Service bulletin | Jul 15, 2026 | Activation of the BMW Intelligent Personal Assistant voice is not possible via the Multifunction Steering Wheel (MFL) button and/or via the… |
| B840226 | Service campaign | Jul 10, 2026 | Once the Telematics Module (TCB2) enters sleep mode, a BMW Data Services trigger for Remote Services… |
| B651826 | Service bulletin | Jun 23, 2026 | If BMW Intelligent Personal Assistant is active in the vehicle, once the customer exits the vehicle and a newkey cycle starts, the Intellige… |
| B651726 | Service bulletin | Jun 17, 2026 | After a factory reset of the head unit, the navigation voice input cannot be activated or deactivated. |
| B651226 | Service bulletin | Jun 13, 2026 | After updating the vehicle to I-level …25-07-5XX, the spoken language of the navigation instructions changes from the set language for the v… |
| B610126 | Service bulletin | Jun 11, 2026 | SITUATION During vehicle start-up the Secure Element (SE) of the BCP may fail causing communication errors. TheCheck Control message “Drive… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for BMW, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is BMW B520325 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the B520325 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every BMW warranty extension on file lists the ones BMW has filed.
Which vehicles does B520325 cover?
The manufacturer filed it against 3 model years: 2025 BMW 2 Series, 2025 BMW 3 Series, 2025 BMW 4 Series. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.