hi guy's i have a 2004 pontiac montana extended van and in my message center it says door open and all the doors are shut ? all the lights shuts down when i close the light and it still says tthe same message of a left door open ?

 

probably a bad switch on the door jamb, or hinge post, dont remember where they are located. find it and replace it. they are fairly cheap, and are easy to replace should take 30 minutes for the novice..