detlefdunkel96
Mercedes B Klasse anti theft alarm issues
Summary of the thread
A Mercedes B Klasse 2020 diesel owner experienced issues with the anti-theft alarm, which was malfunctioning and showing errors related to the alarm control. A possible cause suggested was a weak battery, which can lead to electrical problems, though the car started fine. Another user shared a similar experience where the alarm system was incorrectly coded to activate optical locking, causing false alarms. The solution involved recoding the system at a workshop, which resolved the issue.
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4 comment(s)
detlefdunkel96 (community.author)
Interesting, I haven't checked the battery specifically. The car starts fine, so I assumed it was okay. Was your car showing any other symptoms besides the alarm malfunction? Also, was it a car alarm false alarm or just a non functional one?
marc_schwarz87
The car started fine for me too. The only symptom I had was the car alarm false alarm going off randomly and an error message. The workshop said the alarm system was coded to activate optical locking, which caused the issue. They fixed it pretty quickly. I would suggest you visit the workshop
detlefdunkel96 (community.author)
Thanks for the advice. I took it to a workshop, and you were spot on. The anti-theft system was indeed coded to activate optical locking, which caused the malfunction. Recoding it fixed the problem. The repair cost was 45€. Appreciate the help!
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MERCEDES
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BKLASSE
marc_schwarz87
I had something similar with my B Klasse. It turned out to be a weird battery issue that was messing with the alarm system. Have you checked the battery recently? Sometimes a weak battery can cause all sorts of strange electrical problems. It's like when your phone is low on battery and starts acting up.