horn chirp with remote door lock

I installed a Autostart AS-1455 on my 2005 Ford F150, works great, starts and stops vehicle and locks and unlocks doors.

One little problem, when I lock the doors, I do not know if they locked since the horn does not chirp. I tried connecting a wire to the dark blue (-) wire to the lock wire from the remote (brown (-)), it works, but it sounds too long. I only want a chirp. Is there a way that I could connect the wires in this fashion, adding something between the remote signal wire (brown (-)) and the horn wire (blue (-)) to minimize the duration of the signal in order to get just a chirp?

Thank you for help, love this forum, helps me a lot.

This is exactly what you need.  You can change the value of the capacitor to shorten or lengthen the pulse.   The diagram is good for about 1/2 second pulse.  A 470 Mic capacitor should yield 1/4 second.  330 Mic Capacitor may be more of what you are looking for.  If you need positive output for your horn, simply connect 30 to a constant 12 volt source.

Yes. A adjustable/programmable-pulse, ouput circuit would perform the action you require.

Oops. I answered late.

Thanks for the response, but since my remote start wire already gives a 7/10 of a second pulse negative output, can't I just simply add the capacitor between that wire and the horn negative wire?

I am trying to find the most simple way to connect this. With the factory remote entry, the horn used to chirp only if I pressed many times on lock button. If I pressed only once, it did not chirp.

Thank you