BMW M4 Climate Control Panel Flashing and Malfunctioning

Hey there! I had a pretty similar issue with my 2013 BMW M3 last summer. I have some experience working on cars, but nothing too advanced. My climate control system was acting up just like yours, flickering display, no AC, and weak heat. Took it to my trusted workshop and turned out it was just a faulty wiring connection to the climate control module. They found some corroded pins in one of the main connector plugs. The fix wasn't too complex, they cleaned the connections and replaced the damaged cable harness. Cost me around 95 Euro and everything's been working perfectly since then. Could you share if you've noticed any other electrical issues or if the problem started suddenly? Also, which error code is showing up? This info would help narrow down if you're dealing with the same problem I had. BTW, the new M4s have a slightly different climate control setup than my M3, but they're pretty similar in terms of wiring layout.

Thanks for sharing your experience! My M4 has about 66109 KM on the clock and just had its service last month. The issue started quite suddenly, no warning signs before. Just one morning, the panel started acting weird. No other electrical issues that I can spot. The error code I'm getting is E39-11, but honestly, I'm not super tech-savvy with these diagnostic codes. Your experience with the wiring seems promising, at least it's not as scary as I thought it might be. Did your mechanic mention if this is a common issue with BMW climate systems? I'm hoping it's just something simple like what you had and not a complete module failure.

Hey again! Glad you came back with more details. Yep, that E39-11 code is exactly what I saw on my M4 too. When my issue started, I was around 70,000 KM, so pretty close to where you're at now. Since we've got the same symptoms and error code, I'm even more convinced you're dealing with the same wiring issue I had. And to answer your question, yeah, my mechanic actually told me it's a fairly common problem in these models. The connectors can get corroded over time, especially if you're dealing with temperature changes and humidity. Just a heads up though, while my fix was relatively straightforward, make sure your mechanic checks the entire wiring harness connected to the climate control module. Mine initially just cleaned the connections, but we had to go back because they missed a partially damaged wire further down the line. That's what was causing the intermittent flashing. Since you mentioned having a recent service, maybe bring that up with your mechanic too. Sometimes these issues can start right after a service if something got knocked loose during other work. Let me know how it goes, curious to see if it's the same fix as mine!

Thanks so much for all this detailed info! You've actually made me feel a lot better about the whole situation. Really helpful to know it's a common issue and probably just those pesky wiring connections. I'll definitely mention your experience when I take it in, especially about checking the entire harness and not just the obvious connections. Funny you mention the timing with the service, now that I think about it, the flashing started about a week after my service appointment. That can't be a coincidence! I've already booked an appointment with my mechanic for tomorrow morning. I'll make sure they do a thorough check of all the wiring and connections, and hopefully, it'll be a quick fix like yours was. Thanks again for taking the time to help out. It's always nerve-wracking when these things happen, but knowing someone else has dealt with the same thing successfully makes it way less stressful!