walternacht1
Additional Battery Alarm System Defective
Summary of the thread
The conversation revolves around a "Additional battery alarm system defective" error in a 2014 Mini Cabrio, with the alarm system being non-functional. The suspected cause is a degrading auxiliary battery that may not hold enough charge. A suggestion is made to conduct a battery check, preferably at a workshop, to confirm the issue before replacing parts. A follow-up confirms that the auxiliary battery was indeed the problem, and replacing it resolved the alarm system issue.
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4 comment(s)
walternacht1 (community.author)
That's interesting about your Clubman. When you say 'similar', did you also get an error message about the alarm system, or was it just random alarms? Also, did a system diagnosis point directly to the auxiliary battery, or did you find that out some other way?
felix_schmid98
Yeah, I got some weird electrical warnings too before it finally went belly up. A system diagnosis confirmed it was the auxiliary battery. Honestly, I'd avoid messing with it yourself if you're not comfortable. Just take your Cabrio to a workshop and let them do a battery check; it’ll save you a headache in the long run.
walternacht1 (community.author)
Alright, just wanted to give you a quick update. Took the Cabrio to get a system diagnosis at a workshop. Turns out the auxiliary battery was indeed the culprit, just like you suggested. They ran a battery check, confirmed it was failing, and replaced it. Alarm system's back in action. Total bill came to around 330€. Thanks again for the advice; really appreciate it!
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MINI
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CABRIO
felix_schmid98
Strange issue you're having there. I had something similar with my Mini Clubman – the alarm would out of nowhere go off. Have you checked the auxiliary battery? A weak auxiliary battery can cause all sorts of electrical issues. I suggest running a battery check, maybe at a workshop if you don't have the equipment. It's worth investigating before you start tearing apart the alarm system itself.