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#1
10-06-2003, 05:30 PM
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1988 W124 Factory Alarm Activation
How is the W124 Factory Alarm (1988 300TE) activated/on ?
My research has shown that I need to present the "black-box" with a "Ground" on a particular wire. If I have to present a "ground", is it a continuous ground, or just a ground "pulse"? Thanks, :-) neil 1988 360TE AMG 1993 500E 
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#2
10-06-2003, 09:24 PM
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The control unit is activated if there is a ground signal from any of the 4 doors (door jamb switches), trunk (trunk lamp switch), hood (seperate switch for anti-theft alarm), and possibly it may be activated by the ignition switch if the alarm is activate, and possibly by the brake pedal switch. There may also be a way the alarm knows the radio has been removed. No glass breakage sensor or anti-tow sensor on one that old, at least on the US versions.
Gilly
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#6
10-06-2003, 10:43 PM
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Neil, I believe it's an impulse because the switch mechanism centers before you can pull out the key. Also, I have a bad driver side alarm switch and I use the same key motion to set and unset the alarm - I unlock the driver's door, open the door, twist the key to lock quickly so the alarm doesn't blare. Also confirmed by the W126 wiring diagram.
Sixto 95 S420 91 300SE 87 300SDL 83 300SD
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#8
10-07-2003, 12:37 AM
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I checked the W124 CD manual and couldn't find the anti-theft system in the wiring diagram for the 86-92 series. I checked the W126 CD manual and saw that a YL/BU wire sends a momentary (as long as the key is turned) ground to pin 6 of connector 2. A GN/YL wire sends a momentary ground to pin 7 of connector 2.
If you want to hear from someone who really knows for sure just say so and I'll pipe down  I take it project 500TE hasn't begun? Sixto 95 S420 91 300SE 87 300SDL 83 300SD
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