Door lock staying locked so door cant clamp on to the striker

The interior switch has 3 positions. First position is " light stays on" center position is"off". Third position is "auto on and off"

Ok first is the message center saying that all doors are open if you have this feature , or is it just that the light is staying on and you don't know which door is doing it, I will go with the later if you have door pins that control the lights/door ajar one is broken/ or the actual door lock striker that's bolted to the frame is loose at the lock to check push in on the door/s if they move inwards even a little bit the ground for the interior light is open and this turns on the light/alarm and will stay on until this is fixed //if all doors are good and strikers are tight and adjusted properly holding the door/s in then there are 1 wire connectors on each door latch lock assembly that either corrosion has stopped the electrical contact or it fell off the tab from looseness or the wire has completely broken off/this also applies to the door pins that I mentioned earlier if it applies no year, make, model of vehicle given inquestion? If you check all mentioned here and they are all connected clean and tight the interior light part of your light switch broke inside and the lights staying on // if it was a relay they control accessories inside and the locks would be cycling as well as the power windows /// for door pins unbolt it and pull out each connector and close the door the light will go out when you have the right one and leave it that way till you can get a new one or a junkyard replacement

The latch striker post needs to be adjusted. check for broken plastic roller on the post.

The central locking will not work when a door is open. find the door which is ajar and fix the door switch. Could be a stuck switch (either open or shut) May just need a whack with a soft faced hammer on the door frame. Don't hit it too hard you could dent the panels.

It can be issue with faulty sensor or a wiring issue.Troubleshooting is required.
Click the help link shown below:---
Door Ajar Light and Dome Light Remains ON? http://whoisbyme.blogspot.in/2012/06/2003-mercury-sable-door-ajar-light-and.html
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Door ajar light stays on? http://technoanswers.blogspot.com/2012/01/door-ajar-light-stays-on.html

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Thanks.

need to gain access to the BCM to see which door the module is seeing open. the locks won't lock with key in ignition and a door is "open"

Here's something that might help you. Look at the door theres a little hook that grabs the striker on car, hold the door handle "open" and move the hook to the open position try to close the door. That should solve your problem. Hope that helps you.

there is a switch in each door that senses the door is open, it is called the door ajar/courtesy light switch (imagine that), they stick and have this problem, replace it.

U have a defective door ajar switch.

there should be a switch mounted( or more than one) in the door jamb that tells the car when the car door is open...i will probably look like a little plastic plunger...might be broken off or bad internally