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Hey how do I increase the sensitivity (making my alarm more sensitive) of my viper 671xv.

 
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i think there is a clear little unit that is pluged into the alarms brain. you should see a part where you can use a philips screw driver to tighten or loosen. i think that will increase.

 
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I found that piece. However, I tried making it more sensitive and it did not seem to work.

 
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try going to a local audio or car alarm place. they should be able to help you. most of the time they won't even charge you to do something so small, but try and go back to the place you got it installed and let them know that they installed it.

 
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be careful about making it more sensitive, you probably want to show to all your friends it chirps as you touch it which is great in an empty parking lot. Park downtown and prepare for every bus and truck to set off that alarm.

A good alarm will, sound immidiatly upon window breaking, will sound completly when somone trys to open the doors, and gives warn away for gentle taps.

 
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I understand Adam, thanks. Yea, the problem is that my alarm doesnt even give a warning chirp when I shake the car.

 
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itll do that naturally. it senses sudden movements, not gentle ones. so shaking the car should be pretty fine. give teh car a good tap with your open hand (somewhere that wont dent easily) and the alarm should go off.

if it doesnt, turn the adjusting screw the other way