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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.working after noon till just after midnight.
Rather than altering the system it would be better to find out why its happening so it can just be fixed. Drive the vehicle then park and lock it up. An hour later go out and push and pull on all openings side, front, and rear. See if you can make the alarm go off. This will tell us if there is a concern possibly with that ajar sensor. Can you let me know those results.
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We need to keep trying to make the alarm go off manually to figure out why it is going off on its own. Do the same test as before but this time push on the vehicle to make it rock back and forth. If you still can not get the alarm to go off then you will need a dealer equivalent scan tool to see which part of the alarm system is triggering a potential theft event.
Hello again Chris here,
Since your not bale to even make it go off. I am leaning more towards this being a faulty module that controls the alarm.
Sorry I do not know how to disable this feature. I will opt out and let another try.