If the fob button is broken this can be the cause of the security system confusion. If the button is not stuck down my next step would be to replace the drivers door latch because the micro switch inside the latch goes bad causing the system to think the door is open all the time does the interior lights come on when the malfunction is happening?
Test the switches int he doors by following this guide
and check out the diagrams below for the security system so you can see how the system works.
If everything checks out all trails lead to the BCM which when you replace it it will need to be programmed in.
Check out the diagrams (Below)
Let us know what happens and please upload pictures or videos of the problem.
Images (Click to enlarge)
Friday, March 2nd, 2018 AT 11:08 AM