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  #1  
Old 02-02-2008, 03:45 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
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Theft deterrent radio

I reinstalled the radio in my 560SL today after having it out for about a month. The radio is a Becker 754 and is supposed to have a theft deterrent feature whereby the radio becomes disabled if it is removed and must go to the dealer to be reset. I was all prepared to install the radio and not have it work because of the theft deterrent system. But lo and behold when I hooked it all up, it worked fine. Why I wonder?

When I removed the radio, the car battery was disconnected. It was connected when I installed the radio. I wonder if by the car's battery being disconnected, this disabled the theft deterrent system? If that's the case, that's good info to know, because I'll need to remove the radio again this spring and if disconnecting the car battery when removing the radio allows the radio to work upon re-installation, that will save me a trip to the dealer.

Anyone know for sure?
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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 219,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 19,000 miles
'14 Smart electric cabriolet 13,500 miles
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  #2  
Old 02-02-2008, 04:36 PM
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The early radios that had to go to the dealer to be reset, only went to code if they were removed when the alarm was set OR if the internal battery was dead and the radio was disconnected from power. This last case is the most common problem.
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Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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  #3  
Old 02-02-2008, 07:20 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
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Steve - my alarm was not set, but my internal battery certainly was dead. That's the reason I took it out, to try to replace it. Turns out I didn't have the right soldering iron to do the job, so for the time being I just reinstalled it, not expecting it to work without a trip to the dealer.
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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 219,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 19,000 miles
'14 Smart electric cabriolet 13,500 miles
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  #4  
Old 02-02-2008, 07:45 PM
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Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Actually, I think the latest versions of that theft deterent system didn't rely on the battery. They were only sent to code if taken out while the alarm was set.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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  #5  
Old 02-05-2008, 09:10 AM
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Join Date: Jan 2003
Location: Florida
Posts: 1,084
good site for becker info click on the other models for info on those
http://web.mac.com/dakota/Becker/754.html
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