viper 3000 in 1999 nissan

And neither will the Viper without a pair of 529t's. You are in so far over your head.

yea man, you want the alarm to close the windows when you arm the alarm then you are talking about a bunch more work, each window needs to be interfaced manually through a single device per every two windows. its not just a wire you hook up to to close the windows, its one of the more advanced features you can hook up to an alarm that a lot of seasoned installers dont care to play with if they dont have to. definitely not part of any standard installation.

Yeah, thats what i thought cuz this feature isnt described somewhere in the viper install guide. Whats this 529t's thingy? Viper in combination with this thinger id be able to auto close the windows when i lock the car?

Surprisingly enough it's a window closer thingy.

yes the 529 is a window closer thingy made by the same company that makes viper, DEI. in theory it doesnt sound that hard, you just have to tap onto the existing window motor wires and find somewhere to give power to the module. each 529 will work two windows. in practice however these can be a real pain to install because a lot of times you have to run the wires directly into the door to the master switch or find the wires for each motor somewhere else in the car, and this is also complicated again because theres not much information on your car so everything will have to be found and tested by you.

I've done it all on the slightly smaller European version but the wiring was identical. For a pro it's easy, just use your multimeter/test light. You need to run to the hatch to pick up trunk trigger and you will need a hood pin-switch. I mounted the 529t x 2 in the driver's door, no sweat. Locks are a one wire ground and break system (type F). This is the problem, our OP is an absolute beginner with no idea how to proceed or from his language any competency to do so. How do you explain to him how to pick up the indicators (non-US so not lights) or how to wire the relay for the locking system. Also there's a pre-existing alarm on the car, again according to the OP with "very sharp sensors". What's the point. This is either going to run to the record post or be the ultimate take it to a pro.

I could give him a blow-by-blow how to but we're not paid to teach, we just advise.

id still try to give someone the benefit of the doubt until it becomes clear that its hopeless. id also still recommend taking the car to a professional.