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SL/SLC-Class (R107) 1971-1989 : 250SL, 280SL, 450 SL, 380 SLC, 450 SL, 380 SL, 560 SL

Anti-Theft Alarm System gone haywire!


Old 08-03-2003, 08:13 PM
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1988 560 SL, 1994 E320 Cabriolet
Angry Anti-Theft Alarm System gone haywire!

All of a sudden after unlocking and opening the drivers door, the anti-theft alarm kicked in and would not turn off. It would cycle then shut off, but if I opened a door, trunk or hood, it came back on. I pulled the two fuses in the Auxilary Fuse Holder (F14) but the relay kept clicking and the horn kept honking ( the headlamps did stop flashing). I disconnected the security horn but still the relay was clicking behind the glove box.

Any ideas? A new Anti-Theft alarm module cost $300. plus and I'm not interested in that much of a cure without knowing if this is what is wrong.

David Saidel
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Old 08-05-2003, 06:34 PM
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Mines totally freaking out too. I'll unlock the door and open it and the alarm goes off. I have to lock the door and then unlock it again for it to stop. Super embarrassing.
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Old 12-23-2007, 05:42 PM
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1988 Mercedes 560SL
Anti-Theft gone haywire

I've had the same problem with my 88 560sl. I've had the car for almost 4 years now, and the "haywire" problem started happening to me 1 month ago. I had to disable my alarm, and it was a 2-step process. There is probably a better way, but when my alarm started going off all by itself at 6 am one morning when I unlocked the door and opened the trunk, I couldn't turn it off. Closing the door, locking and unlocking didn't help this time. I had to cut one of the wires to the horn to get it to stop. There are two wires that go to the top terminal of the horn. One will be thicker than the other one. Cut the THICK one. This will allow your horn to still work, but the alarm will no longer sound. You will need to remove the 2 fuses from the 1"x2" black box that sits right in front of the horn. The cover just pulls right off.
I hated to disable my alarm, but I couldn't keep waking up my neighbors. It would go off while I was driving also.....very embarrasing!
If anyone knows a better way, please let me know.
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Old 12-24-2007, 10:07 AM
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99 E320 wagon, 87 560sl.
Door handle

on the drivers side has a collar that activates the alarm and 9 out of 10 you might need to replaced that handle. I think it's about 200.00 and you must buy it from the dealer so that they can get the right one to match your key. 2 fingers.
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Old 03-19-2013, 03:03 PM
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security system

i have a 2001 mercedes clk380 i had to put a new battery in it now the secrity system wnt let me turn on the car what do i need to do? how do i turn it off?
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