Alarm goes off when i close the trunk
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=79792
Printed Date: July 14, 2025 at 2:22 PM
Topic: Alarm goes off when i close the trunk
Posted By: f550maranello2
Subject: Alarm goes off when i close the trunk
Date Posted: June 30, 2006 at 12:04 PM
I have the viper 791 for like a year now.. today i noticed that if the car is armed and (longer than 30 seconds) and i open the trunk then close it the alarm goes off... im trying to figure out the problem... any ideas... i have a 97 nissan maxima
by the way the trunk is set to channel 2 or the aux button
Replies:
Posted By: captainzab
Date Posted: June 30, 2006 at 12:21 PM
Im 100% sure its the shock sensor, close it real softly and it wont set it off
Posted By: swamprat323
Date Posted: June 30, 2006 at 1:32 PM
to see if it is the shock sensor look at LED and see what it tell ya
Posted By: auex
Date Posted: July 01, 2006 at 6:53 PM
I don't see the problem. The alarm is working, you did say it was turned on.
You are opening the vehicle when the alarm is armed and then you are surprised when the alarm goes off. You should have your trunk protected, the trunk trigger tagged, and you should disarm your alarm to get into the vehicle regardless. Trunk pop should only shunt the -instant trigger, not the shock sensor, and that is only for a certain amount of time.
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Posted By: deezee
Date Posted: July 02, 2006 at 11:19 PM
why are you in your trunk while your car is armed to begin with
Posted By: f550maranello2
Date Posted: July 02, 2006 at 11:41 PM
fellas... if for example if i leave the car to go to the store then i come back and want to put someting in the trunk i shouldnt have to first unarm the car..... as soon as i close the trunk the alarm goes off.... i believe that the viper system is smart enoght to know to disengage the alarm if the trunk is open or closed during the car being armed especialy if its being done by the remote....
Posted By: killer sonata
Date Posted: July 02, 2006 at 11:49 PM
Wow. I have never heard of such a way of "thinking" I dont think you understand the point of an alarm, f550. If the vehicle is armed, that means that any tampering with the vehicle should set off the alarm. Thats the point of having the alarm isnt it? This includes opening any doors. You absolutely should and must unarm the car before opening the trunk. Its just common sense.
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"People with mullets live 40% longer" - Ricky Bobby
Posted By: swamprat323
Date Posted: July 03, 2006 at 9:22 AM
mine is that way but i ahve the python 1600xp the car can be armaed but i can pop the trunk and it wont set off the alarm, then afteri close the trunk the trunk becomes aramed again, but everythign eles is armed. for as long as i can remeber all DEI are this way, im not sure if the shock sensor is still on or not i dont slamed the trunk close, i will go out and see what happens.
to fix your problem dont slam the trunk close, to enter the car you have to disarm form remote.
Posted By: killer sonata
Date Posted: July 03, 2006 at 10:46 AM
well to fix your problem and to answer your question. The only 2 ways of "fixing" your problem that i see would be to unarm the car before opening the trunk or removing your shock sensor.
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"People with mullets live 40% longer" - Ricky Bobby
Posted By: spookiestylez
Date Posted: July 03, 2006 at 11:20 AM
dont slam the trunk  ------------- RTFM
Posted By: Chris Luongo
Date Posted: July 04, 2006 at 4:44 PM
Hey guys, f550maranello2 is right-----a quality aftermarket car alarm should work seamlessly and smartly, just like factory ones do...........this is an example of why so many people hate car alarms.
f550maranello2,
You're perfectly in the right to want your system to work as well as it should, but I do have to say, these other guys are right.
To prevent the problem, here are the things you can do.
--Remember to have the whole car unlocked whenever you are going into the trunk.
--Close the trunk gently.
--Lower the sensitivity of the shock sensor.
--Disconnect the shock sensor altogether.
--Here would be the best way, if you have the know-how, or the money to pay a pro to do this:
Take the pinswitch wire from the car's trunk, have it activate a relay, and use the relay to interrupt the shock sensor, so it can't work when the trunk is open.
Posted By: killer sonata
Date Posted: July 04, 2006 at 5:55 PM
Chris Luongo wrote:
Take the pinswitch wire from the car's trunk, have it activate a relay, and use the relay to interrupt the shock sensor, so it can't work when the trunk is open.
If this is the best way, could you explain to me what would happen in this situation..... Lets say I am a theif and I pry open his trunk. This would trigger the relay to bypass the shock sensor and not set the alarm off as Im stealing everything out of his trunk. Is that correct? If so, how is this relay the best method? ------------- "People with mullets live 40% longer" - Ricky Bobby
Posted By: killer sonata
Date Posted: July 04, 2006 at 5:56 PM
Chris Luongo wrote:
Take the pinswitch wire from the car's trunk, have it activate a relay, and use the relay to interrupt the shock sensor, so it can't work when the trunk is open.
If this is the best way, could you explain to me what would happen in this situation..... Lets say I am a theif and I pry open his trunk. This would trigger the relay to bypass the shock sensor and not set the alarm off as Im stealing everything out of his trunk. Is that correct? If so, how is this relay the best method? ------------- "People with mullets live 40% longer" - Ricky Bobby
Posted By: captainzab
Date Posted: July 04, 2006 at 6:30 PM
killer sonata wrote:
Chris Luongo wrote:
Take the pinswitch wire from the car's trunk, have it activate a relay, and use the relay to interrupt the shock sensor, so it can't work when the trunk is open.
If this is the best way, could you explain to me what would happen in this situation.....
Lets say I am a theif and I pry open his trunk. This would trigger the relay to bypass the shock sensor and not set the alarm off as Im stealing everything out of his trunk. Is that correct? If so, how is this relay the best method?
First, opening the trunk will set off zone 1 (which is trunk sensor)
That has nothing to do with shock sensor (zone 2)
Understand? 
Besides, shock sensor wouldn't set the alarm off if some pry open the trunk.
Or are you thinking that using Chris' method disarms the alarm, because it doesnt, just zone 2
Posted By: killer sonata
Date Posted: July 04, 2006 at 6:47 PM
From what all has been said so far, when he opens the trunk the alarm does not go off, only when he shuts it. So this means that the alarm is not hooked up the the trunk. so if a relay bypasses the shock sensor, when a thief rips open the trunk and shakes the car stealing stuff, the alarm will not go off. Am I right or am I missing something?
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"People with mullets live 40% longer" - Ricky Bobby
Posted By: captainzab
Date Posted: July 04, 2006 at 9:46 PM
killer sonata,
im pretty sure topic starter meant he is remote opening his trunk. This causes zone 1 to be temporarily by-passed. Understand?
But if a thief pries open the trunk, zone 1 wont be by-pass so the alarm will go off. This has nothing to do with shock sensor, the trunk sensor will cause the alarm to sound.
Yes you are correct in thinking that when the trunk is open, the shock sensor wont sound if he uses Chris' method of by-passing the shock sensor. But common sense tells me that noone will steal stuff out of a trunk and shake the car triggering the shock sensor anyways. (unless he falls in and shake the car? dont know why you would need shock sensor when trunk is open)
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