Tapping into OEM horn for alarm

[economatic]

Originally Posted by CTScott

Tap the black wire on the white connector in the picture (yours will probably only have the black wire {no blue and brown}), and like Tamango said, it needs to be grounded to make the horn blow.

That was a very helpful picture--my employer's internet censors blocked it so I had no idea it was there until viewing the message at home. Thanks again for the detailed info.

Originally Posted by Liu997

Does the module give a constant -12v so the alarm wouldent sound like a normal one, more like crap

The alarm I have can use both the horn and the siren. The horn is a negative trigger so it just gives a blast when grounded (what I was looking for in this thread) whereas the siren is a +12v. If I understand your question correctly you are asking about the tones of the siren, which is in the circuitry of the siren.