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Good morning, this happens if the door is ajar, if the door ajar switch is not showing closed when the door is closed it will cause this. I would get some WD-40 and heavily spray the door switch. If you open the door look where the door closes it will push on a button that tells the vehicle the door is now closed. Get it heavily soaked in WD-40 and open and shut the door many times to work it in. If this does not do the trick than one of them may need to be replaced. The problem is without a handheld scanner it will be very hard to tell if it is closed. Let me know if you have any questions, thanks.