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Are you using the key in the outside door lock while the alarm is going off? Also disconnect both battery cables and hold them together for a minute. Then reconnect the battery, this should reset the alarm.
Make sure all the doors are fully closed too.
Make sure tail gate is closed all the way. Unlock and lock all doors by hand, you could have a sticking lock actuator.
Is there a key in the exterior of the pass front door? try that too if there is.
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