Auris auxiliary battery alarm issue

Is the main car battery in good condition? Have you tested its voltage? It's unusual for an auxiliary battery issue to completely disable the entire alarm system. Are you sure it's the auxiliary battery?

The main battery seems fine. But the error code points to the auxiliary battery circuit. Do these systems often fail like this, even with a good main battery?

While the main battery matters, an old auxiliary battery can cause these issues, especially with that error code. Modern alarm systems are complex, so shouldn't you get a professional diagnosis?

I appreciate the insight. A professional assessment makes sense. I took it to a workshop and replacing the defective battery alarm system including installation cost 330€ and solved the problem.