BMW iX Alarm System Goes Silent, Siren Failure Alert

I had a similar issue with my 2019 BMW i3s. The alarm system suddenly went silent one day, no chirp, no response. After dealing with this for about a week, I took it to a certified shop. Turned out it was a loose connection in the siren module wiring harness. There was slight corrosion on one of the connectors that disrupted the communication between the siren and the main system. The technician had to remove the rear bumper cover to access and clean the connections, then secure them properly. It wasn't a major repair, but accessing the components was pretty labor-intensive. The alarm system is integrated with several other security features, so it's not something you want to leave unfixed. Since this repair, I haven't had any issues with the alarm system. If you're having similar symptoms, I'd recommend getting it checked at a certified BMW service center, they'll have the right diagnostic tools to pinpoint the exact problem. Hope this helps with your decision.

Really appreciate you sharing your experience! That sounds exactly like what I'm dealing with. I've been worried about taking it to a shop without knowing what to expect. Would you mind sharing what the total repair cost was? Also curious if you've run into any other electrical gremlins since getting it fixed?

Hey there! Glad I could help! Just wanted to follow up, after seeing your questions about costs and reliability. I got the issue fixed last month, and the total bill came to 95 € for repairing the faulty cable connection in the siren module. Pretty straightforward fix, honestly. The Siren communication fault is completely resolved now, the alarm chirps perfectly when locking/unlocking, just like it should. And to answer your other question, nope, haven't had a single electrical issue since the repair. Everything's been running smooth as silk. My i3s is back to its normal self, which is a relief. The repair shop did a thorough job, and it shows. Looking back, I was probably overthinking it, but these electrical gremlins can make you nervous, right? Trust me, getting it fixed properly is worth every penny. It's not just about the beep when you lock the car, it's about having all your security systems working properly. Let me know how it goes with yours!

Thanks so much for all the details! I finally got my car checked today. You were spot on, it was indeed a wiring issue. The mechanic I found was actually great, really knew his stuff. The repair cost was a bit higher than yours, around 150€, but they also did a full system check while they were at it. Funny thing is, I was stressing about this for weeks, but the actual fix only took about an hour. The mechanic showed me the corroded connector, it was such a tiny thing causing such a big headache! The alarm's working perfectly now, chirping away like it should. You really helped me make the decision to get it fixed rather than putting it off. I'm just glad I didn't go back to my old mechanic, this new guy really knew his BMWs. Thanks again for sharing your experience, it made the whole process much less stressful!