dennisroth10
Mercedes E Klasse alarm malfunction
Summary of the thread
A 2009 Mercedes E Klasse owner reported a malfunctioning anti-theft alarm system, with an error stored and the alarm not functioning. The issue was suspected to be related to the alarm's coding to use the indicators for locking. After consulting a workshop, it was determined that the problem was indeed with the alarm's settings related to optical locking. The system was adjusted, resolving the issue.
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4 comment(s)
dennisroth10 (community.author)
Thanks for the quick reply. The battery seems fine when tested. I don't see any water. Could a bad alarm sensor cause this? Or is there a common thing that breaks that I should know about?
richardloewe80
A bad sensor is possible, but not as likely. With the error and the alarm not working, it needs a closer look. Could the optical locking coding be the problem? Maybe, but not likely by itself. Take it to a workshop to get it scanned with a good tool. They can find the exact error code and figure it out from there.
dennisroth10 (community.author)
Thanks for the advice. I took it to a workshop, and the error was about the alarm's settings, like you thought, with the optical locking. They tweaked the system, and it cost 45€. It's working now. Thanks again.
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MERCEDES
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EKLASSE
richardloewe80
That's a strange one. Have you checked the car battery lately? A weak battery can mess with the electrics, including the alarm. Also, any signs of water getting in near the alarm sensor?