[W126 Coupe] Alarm surprise this morning- lights and horns a'blazin

[Jonathan]

Rick,

Your module is under the passenger side floor mat.  Pull them both out 
and you'll see a large plastic panel in the front of the foot well.  A 
10mm w/ an small extension will remove the plastic nut securing it.  In 
side you will see a large (3 X 6 or so) module w/ Becker written on it.  
Unplug that unit and your alarm will be disabled.  I find these modules 
fail w/ age and do exactly as you describe.  Best bet would be to find 
good used or just leave it disabled...these cars require Far to much 
effort to make them in the least bit attractive to car thieves.

Jonathan

Rick Granlund wrote:

> Hi-

>     My '89 560SEC's alarm went off this morning when I opened the 

> door.  It had not been locked. I tried locking and  unlocking from the 

> driver's door - no luck, the alarm still sounds.  I tried locking & 

> unlocking from the passenger door side - same thing - no luck.  I 

> suspect the switch that controls/sends a signal to the alarm module 

> (likely in the driver's door) is loose or not being tripped to the 

> alarm off position.  Either way, I am stuck with an inoperative car.

>     My question"  Anyone have the diagrams for the alarm system.  

> Where it gets it's power (fuse number and location) and where the 

> alarm module is.  I understand the alarm module must send a 'no alarm' 

> signal before the car will be allowed to start (fuel pump power??). If 

> there is a fuse I can pull or something, to stop the alarm and allow 

> me to drive to the dealer or pull the door panel to check it out, that 

> would help.

> any help would be appreciated. (how to pull the driver door panes, the 

> alarm switch in the door, power source etc.)

> Many thanks in advance

> Rick

> 89 560SEC

> 88 300CE

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1996 S600 Euro "Scharnhorst"
1991 560 SEC Full Euro ECE (for sale)
1991 560 SEC 226Hp/271ft/lbs (TT conversion IP)
1988 300 TE
1989 560 SEC AMG (Mech.lifter/radical cam conv.)
1986 560 SEL 6.0L 32V AMG
1980 280 SE Euro
2006 Z4 3.0Si M-Spec