G Klasse Anti Theft Alarm Problem

My 2006 Mercedes G Klasse gasoline has an anti-theft alarm system issue. The error memory shows an alarm system malfunction, but the alarm itself is completely inactive. It has 280258 km on the clock. I've checked the usual suspects, but I'm stumped. Has anyone else experienced this? I suspect it may be coded to activate optical locking which might be related to the problem.

4 comment(s)

I had a similar problem with my G Klasse a while back. Check your battery, even if it seems fine. A drop in voltage can cause the alarm control to act erratically. Also, did you experience any power failure recently?

Thanks for the reply. The battery seems fine, but I'll double-check the voltage to be sure. When you say power failure, do you mean like a complete loss of power, or just fluctuations?

I meant a complete loss of power, even for a very short time. In my case, the car alarm issues started after that. If the battery is ok, you might just need to visit a workshop to get the alarm system recoded or the error memory cleared. It's worth a shot before replacing any components.

Thanks for the advice. I checked the battery again, and you were right, the voltage was low. Replaced the battery and had the error memory cleared at the workshop for 45€. Turns out the anti-theft system was indeed coded for optical locking (indicators), which contributed to the problem. Appreciate your help!

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