BMW M4 Door Sensors & Central Locking System Problems

Hey there! I had a very similar issue with my 2013 BMW M3. I have some experience working on cars, mainly basic maintenance and troubleshooting. Had the exact same symptoms, unusual door warnings and central locking going crazy. Took it to my regular workshop, and it turned out to be a faulty wiring connection in the door harness. They found a damaged cable that wasn't making proper contact. The repair involved replacing the connection and testing all door functions. Cost me 95 Euro, and it's been working perfectly since then. Before we dig deeper into your M4's issue, could you tell me if you're getting any specific error codes, and whether this happens with all doors or just one specific door? Also, when did you first notice the problem?

Thanks for sharing your M3 experience! My issue started about 2 weeks ago, and I'm getting these problems mainly with the driver's door, though sometimes the passenger door also acts up. No specific error codes showing up, just those general "door open" warnings on the dash even when everything's closed. I'm due for a service anyway (currently at 194,198 KM), so I might have them check the door harness while they're at it. Did your mechanic mention how common this issue is? Just wondering if it's a known weak point or just unusual wear and tear.

Hey again! Thanks for the additional details about your M4's issues. Yeah, those door harness problems can be tricky, my M3 was showing similar symptoms just like yours, mainly on the driver's side too. When I had mine fixed, my mechanic actually mentioned it's fairly common in these models, especially as they age. He said he sees quite a few BMWs from that generation with similar wiring issues, particularly in the driver's door since it gets the most use. Makes sense when you think about it, all that opening and closing eventually takes its toll on the wiring. Since you're already planning a service visit, that's definitely the way to go. In my case, the repair was pretty straightforward once they identified the exact spot where the wiring was damaged. Just make sure they do a thorough check of all the connections, when my mechanic was fixing mine, he found some early signs of wear in the passenger door harness too, so we preventively fixed that as well. One tip though, while you're waiting for the service appointment, try to be gentle with the doors. I learned this the hard way, slamming them can sometimes make the connection issues worse. Keep us posted on what they find!

Thanks so much for all the detailed info! It's really helpful to know this is actually a common issue with these models. I'll definitely mention your experience to my mechanic when I take it in next week. Good tip about being careful with the doors too, I've been babying them since the problems started, just to be safe. Makes total sense about the driver's door getting the most wear and tear. Come to think of it, I've probably opened and closed that door thousands of times over the years without ever thinking about the wiring inside! I'll have them check both doors thoroughly while they're at it. Rather fix everything now than have to go back for the passenger side later. Really appreciate you taking the time to share your experience. I feel much better knowing this is likely just a wiring issue and not something more serious. Will definitely update once I get it sorted!