330.3x false trunk alarms
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=135670
Printed Date: May 16, 2025 at 8:52 AM
Topic: 330.3x false trunk alarms
Posted By: beech2000
Subject: 330.3x false trunk alarms
Date Posted: December 31, 2013 at 12:42 AM
Three times now received false alarms (trunk)on my 330.3x.
The tail gait has a magnetic switch instead of a pin switch wired into the main connector. the system was working perfect for a year now. Any ideas on what could be going on?
Replies:
Posted By: beech2000
Date Posted: December 31, 2013 at 7:51 PM
Hmm,
Week forum
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Kevin
Posted By: i am an idiot
Date Posted: January 01, 2014 at 10:16 AM
It was not a Week, it was less than a day between your 2 posts.
The tolerance of most magnetic switches are very narrow. Have you checked to see if one of the components have moved? What are the chances that water may have penetrated the switch housing?
Posted By: KPierson
Date Posted: January 01, 2014 at 8:52 PM
Yes, if it were a week forum you would have to wait 6 more days before making that determination.
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Kevin Pierson
Posted By: beech2000
Date Posted: January 02, 2014 at 8:01 AM
In deed, a week is 7 days. Glad that's settled.
1) Neither component has moved. (Black RTV in place of two sided sticky tape so very firmly mounted and sealed)
2) Yes water could have entered the mag switch casing but no resistance is seen on Fluke DVM with gate closed. .03ohms to ground when opened.
3) About 11.8 VDC seen on the blue wire at main connector when closed
It hasn't given off a false alarm for about a week now. nuk nuk nuk
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Kevin
Posted By: KPierson
Date Posted: January 02, 2014 at 8:13 AM
When have the false alarms occurred? Has the weather been unusually cold during any of the false alarms?
Once it falses when you rearm the alarm does the trunk zone reset or does it stay tripped for an extended period of time?
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Kevin Pierson
Posted By: beech2000
Date Posted: January 03, 2014 at 7:50 AM
[QUOTE=KPierson] When have the false alarms occurred? Has the weather been unusually cold during any of the false alarms?
Once it falses when you rearm the alarm does the trunk zone reset or does it stay tripped for an extended period of time?[/QUOTE
Yes that's exactly what the system did. How did you know? System stayed tripped for an extended period. OAT was warm and the all at once a front moved through dropping the temperature significantly with tons of rain. The false warning reported on the remote key well into the next day and then went off two more times the next night. It hasn't done it again since then. What gives?
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Kevin
Posted By: i am an idiot
Date Posted: January 03, 2014 at 9:57 AM
If water would have penetrated the housing, it will take a day or two for it to evaporate. If it had rained the previously, that could be something to think about.
Posted By: oldspark
Date Posted: January 03, 2014 at 10:35 AM
It could be many things depending on the magnetics and switch details (reed switch or Hall etc).
- condensation (across terminals or internals)
- interference/noise (GSM, transmitted, vehicle switching, battery fluctuations (aging battery?))
- magnetic variation (temperature etc) especially if borderline proximity.
Posted By: KPierson
Date Posted: January 03, 2014 at 1:27 PM
The cold causes metal to move - it is very possible that when it got cold quickly the magnets were pulled just far enough that they tripped. Also, you mentions rain, it is possible condensation got inside the switch.
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Kevin Pierson
Posted By: beech2000
Date Posted: January 03, 2014 at 1:40 PM
Proximity is .200" and perfectly aligned. Thinking about now I think moisture is the only explanation. Moisture sure causes havoc on aircraft components which is my field. (Fuel quantity capacitance probes and conditioning units, pressure transducers, Proximity sensors, Avionics etc..)
What is your thoughts on using a pin switch for my tail gait instead?
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Kevin
Posted By: KPierson
Date Posted: January 03, 2014 at 6:19 PM
Do you have access to the prox switch datasheet? I have seen some that are supposed to be installed offset from each other a bit and I have also seen a wide range of mins and maxes for distance.
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Kevin Pierson
Posted By: beech2000
Date Posted: January 03, 2014 at 6:26 PM
No I don't. It was a generic mag switch I purchased off e-bay. I use to purchase in the day locally from Radio Shack but they no longer sell magnetic switches for alarm applications. Should I try shimming one of the components closer?
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Kevin
Posted By: beech2000
Date Posted: January 03, 2014 at 6:37 PM
KPierson wrote:
Do you have access to the prox switch datasheet? I have seen some that are supposed to be installed offset from each other a bit and I have also seen a wide range of mins and maxes for distance.
I can purchase and easily change with replacement. Suggestions and where I can purchase if it does it again? ------------- Kevin
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