2003 C240 Alarm System Battery
I was told that the issue I have with the alarm going off randomly could be from a weak secondary battery. I'm told that there is a high voltage battery that is located some where in the vehicle, but I can't locate it. Does anyone know where it is?
I had a few that the key was actually causing the alarm to go of intermitantly. Found it by accident. I pulled the key apart to inspect the batteries and when I put the key together the alarm would go off immediatly. I noticed that if I locked the car and left the key in range the alarm would eventually go off. If I locked the car and took the key out of range it never went off. Replaced the key and never had a problem since. Not saying this is your cause but something weird that can cause that.
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ontheball247
Mercedes C Class
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Jul 4, 2021 10:03 AM




