saturn sky redline

Hello

I'm looking for a wire in my Sky which becomes (-) when the factory alarm is triggered on and stays Negative for some second after the immobilisation or during the immobilisation. Can someone help me with this please?

Check the alarm siren wire, though it may be pos so you will have to flip the polarity.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Howie, he has a factory alarm, I do not think he has a siren,  What exactly are you trying to do?

Audiovox does not show any info for an outboard alarm module.  All security related wiring is at the BCM (located under the carpet in passenger footwell)  or at the ECM (located under the hood). It being intergrated in the BCM may make your idea a bit more complicated.

I have indeed a factory alarm.

I tried first the lock wire of the doorlock actuator/motor (like I have done in the past for many many other european cars) but it looks like that at GM these wires have different signals/polarity.

I also tried to find a positive (+) signal (to reverse by a relais) which should be nutral when the alarm is not activated bit I couldn't finf this either.

My Window closure unit/module is from Serpi Star / GT(Italian) which requires a negative pulse for 10 seconds or constant after immobilisation.

You need a constant armed output, not what you described in your first post, that's what confused me at least. All window closers work that way, anyway there are two answers;
a) Use a 12v latching relay fired off lock motor wires, obtained from Mouser or Radio spares.
b) Something to hold a relay on for about 10secs., Mr. I knows the answer here.
Just a point are you sure you've tested your factory alarm and haven't found a GWA (ground whilst armed) wire?

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Magnetic switch mounted to the door lock mechanism.  Switch mounted to the car and magnet mounted to the lock mechanism.

sorry if my first explannation was not clear. Actually what I'm really lloking for but couldn't descipe well is what you raise as question

You wrote: Just a point are you sure you've tested your factory alarm and haven't found a GWA (ground whilst armed) wire?

So, I'm looking for a GWA but I don't know where I should look for this wire in this car (I couldn't find the location of the factory alarm module). This is the reason why I initially raised my question.

Is this magnetic switch operated after each doors closure or only when the doors are locked? Do you know the wiring location of this Switch?

Can I find the wires also in BCM

I don't think there will be a GWA wire on a factory alarm. A possibility might be a latching relay to get the GWA whenever the doors are locked. You could also get a timed relay from DEI that activates the same way to give you the 10 seconds you need...

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Mike M2
Tech Manager
CS Dealer Services

You have to buy said switch and wire it up. 

thanks a lot guys for your tips. I will sort this out in coming next 2 weeks when my remote start is delivered from USA. Of course I will keep you updated!

BTW; can you explain me what a said switch is and where I can buy it? (a link?)