If the door ajar alarm will not quit when all doors are closed how do you fix it?

When you open the door, you should see the sensor, looks like marker cap sticking out either from the door or from the car body, check all around, and press it, do this to all doors and truck, if you have a station wagon. If the door ajar still doesn't stop, than you need to remove this and replace it, or you can super glue it and forget about it.