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#1
01-18-2006, 12:42 PM
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2000 C230 battery jump started
First time posting. Car had the lights left on last night, went out to it this morning, and was buzzing from the left front. Opened the door with the key, light swx was on, so opened the trunk and put a charger on the battery. Buzzing from left front now got very loud, and did not stop. Cycled the locks, started and drove the car, buzzing did not stop. Pulled some sort of speaker buzzer from under left headlamps, even with the electrical connector pulled, some sort of capacitor kept this thing buzzing. Sent my girl to work in the car, only other symptom is radio is dead. Did NOT hook charger up incorrectly. What is this buzzer and its role in the car? What should I expect if I reconnect this device? Any insight is appreciated.
Thank you, Garth 
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#2
01-18-2006, 01:49 PM
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That should be your alarm siren. It is self powered. They will go off if the battery is dead. The only way to reset it is to plug it in to the car for a min.
of 10 minutes to recharge it. Then you need to cycle the keyless entry to shut it off. The siren has a discrete CAN bus going to the alarm control module. They have to talk to each other to turn it off, but if it is dead, it can't communicate. Your radio may need to be re-coded with the security code that came with the car. Regards, DR.D
__________________
Dr.Diesel - Shop Foreman Master Guild Mercedes-Benz Technician. Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand? 
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#3
01-18-2006, 06:49 PM
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Thank you for the insight. As the siren has thoroughly discharged by now, when I reconnect it, is the alarm going to sound for the ten minutes; or am I just waiting until a sufficient charge has entered the siren for it to communicate with control unit properly? Real question is, am I going to have to listen to that NOISE some more? Radio is recoded and working normally, thank you.
Garth
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#4
01-18-2006, 10:42 PM
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It may go off for the whole time, it may never turn off. Those things are like
Hand Grenades. We pack towels and fender covers around them while they are mis-behaving. If you can't get it to turn off after 30 minutes of charging, it may need to be replaced. Here in the shop, we had fully charged ones go off for 6 hours!!! The only thing that stops them is a sledgehammer. They go off under water too. (we tried that first!  )DR.D
__________________
Dr.Diesel - Shop Foreman Master Guild Mercedes-Benz Technician. Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?
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