BMW X4's Multimedia System Goes Dark, MOST Bus Issue?

Hey there! I had a similar issue with my 2015 BMW X3 30i last year. The MOST bus failure is pretty serious since it's the main communication network for all multimedia components. In my case, it was traced to a faulty amplifier control unit that was corrupting the fiber optic signal loop. At the garage, they had to run a complete diagnostic sweep of all MOST components. The amplifier needed replacement, and they had to reprogram the head unit to restore proper communication between all modules. The whole process took about two days because they needed to validate the entire system after the repair. It's not something you want to mess with at an independent shop unless they're BMW certified and have the right diagnostic tools. While expensive, this isn't something you can postpone since it'll affect your entire entertainment and navigation system. I'd suggest trying a different BMW dealer if you're not happy with your current one. These MOST bus issues usually need proper dealer-level diagnostics to fix properly. Best of luck with the repair.

Hey, thanks for sharing your experience! That's super helpful since I'm facing the exact same symptoms. I've been worried about taking it to the dealer, but hearing that they properly diagnosed and fixed your issue gives me some hope. Would you mind sharing how much you ended up paying for the whole repair? Also, has everything been working fine since then, or have you noticed any other quirks with the system?

Hey again! Happy to update you! Yeah, after getting it fixed at the dealer, everything has been running perfectly smooth, no more audio issues, navigation works like a charm, and all systems are talking to each other properly. It's such a relief not having those annoying system failures anymore. The total bill came to 1000 € for fixing the defective control unit in the MOST bus. I know it's not cheap, but considering how crucial this system is for pretty much everything entertainment-related in these cars, it was worth every cent. Haven't had a single problem since the repair, which was about 8 months ago now. Trust me, once it's fixed properly, you'll forget you ever had the problem. Just make sure they do a thorough test of all systems after the repair. The techs spent quite a bit of time making sure everything was communicating correctly before handing the car back to me. Let me know how it goes with yours! Always happy to share more details if you need them.

Thanks for all the info! Just wanted to update you on what happened with my X4. Finally got it fixed last week, and you were spot on about everything. Took it to a different dealer and had a much better experience. The tech found a faulty fiber optic cable in the MOST bus system that was causing all the trouble. Repair took about a day and a half, and cost me around 800 €, which wasn't as bad as I was expecting after hearing some horror stories. They did a complete system check before giving me back the car, and everything's working perfectly now. The audio's crystal clear, navigation's back up, and all those annoying error messages are gone. Such a relief to have everything working properly again! Really appreciate you sharing your experience, it helped me know what to expect and pushed me to get it sorted properly rather than trying to find a cheaper fix somewhere else. Thanks again for all your help!