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Citroen C4 BSM: Converting BSM L04-00 to L11-00 - Is it Possible for 2.0 177KM Xenon 2007 Model?

halski78 24399 16
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Can a Citroën C4 BSM L04-00 be replaced with an L11-00 module on a 2007 2.0 177 hp xenon model?

Yes—forum users report that replacing a Siemens BSM L04 with an L11 works, and after the swap the car operated normally [#17753690] [#20063405] Another user also reported a successful jump from Citroën/Peugeot BSM L06/L04 to L11 with everything working as it should [#18110975] [#20063405] One reply notes that the L04/L05/L06 family is closely related [#16986819] However, there is also a warning that if the module variant is wrong, the wipers may run nonstop [#16985014], so the replacement should match the vehicle’s configuration.
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  • #1 16985001
    halski78
    Level 6  
    Posts: 7
    Is it possible to convert BSM L04-00 to L11-00? L04 is mega expensive and L11 you can buy a stimulant with normal money, both look identical. My c4 is 2.0 177KM with xenons 2007. I read on the internet that the number can not be lower than the current one, but can someone experienced confirm it?
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  • #2 16985014
    adam7009

    Level 41  
    Posts: 5609
    Help: 656
    Rate: 1625
    it cannot be different, the wipers will run nonstop
    Company Account:
    AUTO-ELELEKTRONIK AB
    Linowiec, Lisewo, 86-230 | Tel.: 697XXXXXX (Show)
  • #4 16985541
    adam7009

    Level 41  
    Posts: 5609
    Help: 656
    Rate: 1625
    look what the topic is about, certainly not BSI
    Company Account:
    AUTO-ELELEKTRONIK AB
    Linowiec, Lisewo, 86-230 | Tel.: 697XXXXXX (Show)
  • #5 16986819
    damdam

    Level 34  
    Posts: 2299
    Help: 274
    Rate: 943
    L04 - L05 - L06 go behind each other - I checked.
    Company Account:
    ACME Damian Michalski
    Boczna 3a, Żory, 44-240 | Tel.: +48XXXXXXXXX (Show)
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  • #6 17753690
    magister1234
    Level 1  
    Posts: 1
    I just replaced the L04 with the L11. Standard airflow was not working. There are instructions on how to bypass the fuse, etc. on the forums. In the short term, good because you can drive, but you have to remember to turn off the air supply. I discharged the battery twice in these ways and decided I risk replacing the BSM L04 with L11 bought on the Allegro for about PLN 140. It looked identical, and so did Siemens. After a week of use, I am very happy, I did not notice any irregularities. In fact, it turned out that the airflow was not the only problem with the broken BSM. There were mistakes, he seemed to smoke more. In my example, I recommend that everything works as it should.
  • #7 18110975
    dejaq
    Level 11  
    Posts: 7
    Rate: 6
    For posterity and hesitating. I just skipped a Citroen C5 L06 Siemens on a Delphi L11 (from Peugeot 206) and everything works as it should.
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  • #8 18113532
    Anonymous
    Level 1  
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  • #9 18113957
    CAR pass
    Level 20  
    Posts: 657
    Help: 41
    Rate: 238
    How do you get the mass off the plate?
  • #10 18114049
    Anonymous
    Level 1  
  • #11 18114206
    dejaq
    Level 11  
    Posts: 7
    Rate: 6
    Yaa. I think I prefer to give PLN 50 than play such druciarstwo. What if the fault somehow happens elsewhere? Yes, I saw, it is enough to cut the plastic housing from the PCB with a saw blade and solder between the PCBs with a hot wire because desoldering them is too much work. And then hot glue and guitars.
  • #12 18114335
    Anonymous
    Level 1  
  • #13 18114378
    dejaq
    Level 11  
    Posts: 7
    Rate: 6
    The topic is about the model L. which you can find on the Allegro from PLN 40. Of course, we're talking about Delphi production. That is why I am writing about it. If I were to give PLN 400 for Siemens, I would prefer to cut this hole and solder it. But why overpay or wire when you can successfully replace a module for several dozen zlotys.
  • #14 20063405
    k.st
    Level 1  
    Posts: 1
    Rate: 2
    dejaq wrote:
    For posterity and hesitating. I just skipped a Citroen C5 L06 Siemens on a Delphi L11 (with Peugeot 206) and everything works as it should.

    In Peugeot 307 1.6 HDI (2005) I replaced L04 Siemens with L11 Delphi (PLN 100) and it works. Thank you for this dejaq post. Citroen C4 BSM: Converting BSM L04-00 to L11-00 - Is it Possible for 2.0 177KM Xenon 2007 Model?
  • #15 20245786
    tipres3
    Level 1  
    Posts: 1
    Rate: 2
    Hello - I have a question for this last photo (I got the same problem with BSM), because this L06 has a different number of fuses than the L11. Everything works fine?
  • #16 20278054
    misztik19
    Level 1  
    Posts: 1
    Rate: 1
    Citroen C4 05r. Fucking module L06. No airflow. I have an elbow made but this is not a solution. New modules, the price is about PLN 1,500, I have already processed stimulants, moreover, the prices are also around 7 hundred - mine was for 2 years.

    Are there any replacements? Regeneration?
    Advise
  • #17 21544723
    blyoghurt
    Level 2  
    Posts: 2
    Rate: 1
    I know the topic is old, but as the years go by more and more controllers are falling down.
    Citroën C5 2005 petrol, full option including voice control (no sunroof).
    Original Siemens L04, replaced with Siemens L06 and a few months ago replaced with Delphi L11. Everything works without any problems.
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Topic summary

✨ The discussion addresses the feasibility of converting a Citroën C4 BSM module from Siemens L04-00 to Delphi L11-00 in a 2.0 177KM Xenon 2007 model. It is generally confirmed that direct replacement without modification can cause issues such as continuous wiper operation and airflow malfunctions. However, several users report successful conversions by flashing the CPU and EEPROM or bypassing certain fuses, with the L11 module functioning properly after these adjustments. The L04, L05, and L06 Siemens modules are closely related, while the Delphi L11 is a more affordable alternative available on platforms like Allegro. Some recommend repairing the original BSM by addressing relay contact faults instead of replacement. Others share experiences of substituting L06 Siemens modules with Delphi L11 from different models (e.g., Peugeot 206, Citroën C5) with no functional problems. The consensus suggests that while the L11 can replace the L04 with some technical intervention, careful consideration of fuse configurations and module programming is necessary to avoid electrical faults and ensure proper operation of vehicle systems such as airflow and wipers.
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FAQ

TL;DR: Case data: 1 C5 owner reports L04→L06→L11 with 100% functionality; “Everything works without any problems.” [Elektroda, blyoghurt, post #21544723]

Why it matters: This FAQ helps Citroën/Peugeot owners decide safe, low-cost BSM swaps and fixes without guesswork.

Quick Facts

Can I replace a BSM L04-00 with an L11-00 on a 2007 Citroën C4 2.0 (xenon)?

Multiple owners report L04→L11 swaps working in PSA cars. One detailed report notes stable operation after the swap and improved behavior. If your harness and fuse layout match, it is a viable path. Verify connectors, fuse ratings, and outputs before installing. [Elektroda, magister1234, post #17753690]

Will a Siemens L04 work if I replace it with a Delphi L11?

Yes—documented successes include Siemens L04 replaced by Delphi L11, with normal operation afterward. Cross-brand BSM units can function if the variant matches the vehicle’s equipment. Inspect labeling and transfer fuses as needed. [Elektroda, k.st, post #20063405]

What symptoms point to a bad BSM on C4/C5/307?

Common signs include cabin blower not working or staying powered and odd electrical faults. One owner’s temporary blower bypass discharged the battery twice. Drivers also reported higher fuel use and stored errors before replacement. [Elektroda, magister1234, post #17753690]

Are L04, L05, and L06 interchangeable?

Yes—users verified L04→L05→L06 go one after another. Treat them as sequentially compatible within that family, provided your equipment set matches. Always check physical layout and rated fuses beforehand. [Elektroda, damdam, post #16986819]

Is it cheaper to replace or to repair the BSM?

One view claims 99% of failures are a single relay contact, suggesting a low-cost repair. Others prefer swapping inexpensive Delphi L units to avoid invasive board work. Choose based on your tools and time. [Elektroda, Anonymous, post #18113532]

What’s the risk if I fit the wrong BSM variant?

Edge case: a mismatched unit can trigger nonstop wipers. That warning came from an installer who stressed variant matching. Confirm the exact L-code and options before you plug in. [Elektroda, adam7009, post #16985014]

How do I swap a BSM safely (3 steps)?

  1. Match labels: L-code, maker (Siemens/Delphi), and equipment (e.g., xenon).
  2. Move fuses/relays to the same positions; inspect connectors for heat damage.
  3. Fit the module, start the car, and test blower, lights, and wipers. “Everything works without any problems.” [Elektroda, blyoghurt, post #21544723]

L06 has a different number of fuses than L11—does that matter?

A user reported Siemens L04 → Delphi L11 working fine, despite physical differences. Function depends on internal mapping and correct fuse placement. Transfer required fuses and verify each powered circuit after installation. [Elektroda, k.st, post #20063405]

Why does my blower mod (bypass) drain the battery?

Bypasses can feed the blower continuously if not switched, causing parasitic drain. One driver noted two full battery discharges before replacing the BSM, which resolved the issue. Use a proper BSM or switched supply. [Elektroda, magister1234, post #17753690]

Any real-world success stories with multi-swap setups?

Yes. A C5 owner ran original Siemens L04, then L06, then Delphi L11 over months without issues. Quote: “Everything works without any problems.” This supports cross-version reliability when correctly matched. [Elektroda, blyoghurt, post #21544723]

Can I reflash or clone a BSM to convert versions?

One poster says it’s possible by flashing CPU and EEPROM using specialist tools (e.g., Smok) and has done it several times. This is advanced work and best left to experienced electronics techs. [Elektroda, bsv2001, post #16985402]

Is BSM the same as BSI?

No. BSM (engine bay fuse/relay box) differs from BSI (cabin body controller). A response in-thread noted the discussion was about BSM, not BSI—don’t confuse procedures between them. [Elektroda, adam7009, post #16985541]

What is CAN bus in this context?

CAN bus is the vehicle network linking modules like BSI and BSM to share commands and status. Swapping a compatible BSM preserves CAN communication paths when the L-code and features match. [Elektroda, blyoghurt, post #21544723]

What if I just need a temporary fix to drive?

Forum posts describe a blower bypass to keep you mobile, but it demands manual shutoff and risks battery drain. One user used it short term, then replaced the BSM to restore normal behavior. [Elektroda, magister1234, post #17753690]

Are cheap L-series BSMs actually available?

Yes. Members reported Delphi L units available from about PLN 40 and suggested avoiding overpaying when a swap fits your equipment. Inspect used parts carefully for heat or water damage. [Elektroda, dejaq, post #18114378]
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