BMW Alarm System Total Failure, Repair Help Needed

I had a similar issue with my 2017 BMW 3 Series last month. The alarm system completely failed, no optical confirmation when locking, dead interior sensors, the works. Turned out the alarm control module had corroded due to moisture getting in, which also damaged some wiring connections. The repair required replacing the control unit and rewiring some connections. Not a quick fix, took the garage two days to sort it out completely. Not exactly a serious mechanical issue, but definitely not something you want to leave unfixed as it compromises your car's security. If you're getting error codes, it's likely the same problem, these systems tend to fail in similar ways across the BMW lineup. Make sure whoever works on it has experience with BMW security systems specifically. They'll need proper diagnostic equipment to recode the new module to your car's computer. Hope this helps point you in the right direction.

Hey, thanks for sharing your experience, sounds exactly like what I'm dealing with! Really helpful to know about the control module being the culprit. Can I ask how much you ended up paying for the whole repair? Also, has everything been working smoothly since they fixed it, or have you noticed any other quirks with the system?

Yeah, happy to give you an update! After getting it fixed, the alarm system has been working perfectly, no more issues at all. The optical locking signals (the flashing indicators when you lock/unlock) are working great now, and all the sensors are back to normal. I got pretty lucky with the cost actually, only paid 45€ for the repair. My issue was simpler than I first thought, just needed some recoding of the alarm system. Much better than having to replace the whole control module like I initially worried about! It's been about a month since the fix, and honestly, it's like the problem never existed. The mechanic did a proper job programming everything back to factory settings. Just make sure whoever looks at yours knows their way around BMW's security systems, that's really the key to getting it sorted properly the first time. Let me know how you get on with yours, always interested to hear if others have the same experience!

Just got back from the mechanic and wanted to update you! You were spot on about finding someone who knows BMWs. I found a specialist who diagnosed it right away, turned out my problem was a bit more complex than yours. The control module was completely fried and needed replacing, plus they had to fix some water damage to the wiring. Definitely more expensive than your repair, set me back about 500 for parts and labor. But honestly, worth every penny. The system's working perfectly now, all sensors responding, alarm activating properly, and those annoying error codes are gone. The mechanic was great too, really took the time to explain everything and even showed me what went wrong with the old module. Much better experience than my last garage visit! Thanks again for your help, really gave me the confidence to get this sorted properly instead of putting it off.