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#1
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1986 W126 Security System Operation - Radio “Trigger” Circuit
Hello all,
A quick question about the function of the security system on a 1986 560SEL as it pertains to the factory Becker 754 installation and the 5-pin security connector that is also spliced into that spring-clip “trigger” - Namely does the security system activate when ground is broken or does it activate when ground is established upon radio removal? For example - when installing an aftermarket HU should one ground the security wire or, instead, make damn sure one doesn't? I am certain that at some earlier point in my car's life when the security system for the radio was unplugged that the 5-pin security wire WAS grounded meaning that that is either 1) good practice or 2) that my security system has some deeper issues – i.e. not recognizing radio removal. Right now I have it grounded w/o the alarm going off. Thanks in advance!
__________________
"Show me a hero and I'll write you a tragedy." - F. Scott Fitzgerald
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#2
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As I understand it that connection can be left disconnected. It is grounded when the alarm is armed, and if the radio's power is removed while that connection is grounded the radio disabled itself.
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#3
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Thanks a millon.
The logic of the what and the how of the security system as it relates to the factory radio is something that has eluded me for some time now. That 5-pins are seemingly required for a simple on/off, yes/no function doesn't help to make it terribly clear as to what is going on... Cheers!
__________________
"Show me a hero and I'll write you a tragedy." - F. Scott Fitzgerald
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#4
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Just one of those wires goes to the alarm - I think brown?
And yes it should be connected to the metal case [ground] of the new radio if you want that protected by the alarm - activates with loss of the ground connection. You can test this by rolling down a window, locking the car, then reaching in through the window to disconnect (unground) that wire. The alarm arms when the doors are locked. |
#5
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Hmmm...
Now you have me almost convinced that my security system is well and truely buggered - I had been driving around un-radioded and un-grounded for two weeks and not a peep out of it...
__________________
"Show me a hero and I'll write you a tragedy." - F. Scott Fitzgerald
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#6
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Quote:
With the radio wire disconnected, lock the car door with the key, then reach in and open the car door using the handle. The alarm should sound. |
#7
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Good to know...
Quote:
Seriously though, VERY MANY thanks for clearing that one up. Cheers!
__________________
"Show me a hero and I'll write you a tragedy." - F. Scott Fitzgerald
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