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.