1990 eclipse, dei 504d

Greetings,

I just picked up a DEI Double-Stage Shock sensor to try on my 1990 Eclipse with OE security.  According to the manufacturer description, the First-Stage is a warning trigger (Green wire), and the Second-Stage is the full alarm trigger (Blue wire).  From the supplied harness, it's evident the two outputs are open collector and can be tied together so the main alarm fires even for a warning.

Since my Security controller doesn't support a warning, the obvious install involves Green and Blue tied together (ie harness loop end at the sensor), however, two questions:

1) If I wanted to create a warning signal, what is typical vehicle behavior when delivering a warning?

2) Is the actual output from both Blue and Green wires just a brief negative going pulse (like the 506T Glass-Break sensor)?

Thanks for any insights!

Typical vehicle behaviour? The alarm sends out brief chirps in succession to "warn away"

Yes the wires pulse momentarily, normally it's up to the brain of the system to interpret the trigger and act accordingly!

Thanks very much!  As an afterthought, I'm guessing the sensitivity control applies equally to both Warning and Alarm functions?

some shock sensors will have a dial for warning and full impact.

some will only have 1

Well, from inspection, the DEI 504D only has a single potentiometer.  I had expected inclusion of paper documentation, but no -- at least the wire functions are imprinted on the sensor case.  Can't complain about the price, so maybe the minimal documentation has its advantages :)!

Thanks -- the one adjustment probably applies to both modes.

Wow!  I was about to ask if the case orientation mattered, but it never occurred to me rigid mounting itself doesn't work!  That would have had me guessing for awhile -- thanks :)!

I just finished installing and testing the DEI-504D:

FWIW -- I ended up taping it against the side of a center dash metal support member and I'm not having a problem with it detecting exterior vehicle shocks.  The sensitivity is set to max and the Green wire is tied off for now.  It's triggering fine via the Blue wire from various places around the car (takes a pretty good thwack, but not too bad).  All I can guess is perhaps the one that requires a soft mounting is pre-"D"?

I plan on devising a "Chirp" equivalent warning for the Green wire to trigger -- should be a fun project :).

Just completed the install by using the Green Stage I wire to control a reed relay to activate the vehicle horn relay.  Turns out the sensor pulse width is perfect for a horn warning -- good job DEI :)!  All connections are now soldered and I'm finding the sensitivity to be excellent at the max setting.  If I decide it's too sensitive, I'll ease it back a little.  (I'm definitely not having a lack of sensitivity issue with the sensor pressed fairly tightly against a mid-dash steel support member.)