2005 pontiac montana drivers door wont lock with remote but will lock from inside switch or with key on outside...it WILL unlock with remote as well as all other doors...

The dead battery is most likely why the vehicle isn't unlocking. No power to the motors that work the door release. Does the key turn at all in the key slot? Most people only use the remote for locking so the mechanical part of the key slot gums up and stops working with lack of use. Try spraying inside the key slot with a releasing oil like WD40, leave it to soak in and try turning the key again. you might need to do this a few times.
Does the trunk have a key slot? Try that as well then you can simply climb over into the front of the van.

CHECK RECALLS GM HAS A LOAD OF PROBLEMS

The alternator is not connected to the door locks so is a separate issue. Your issue is likely because you left the windows open in the rain and water gets into the door lock buttons (switches) and this is the faulty area. Replace the door lock buttons themselves from a junk yard. the drivers side buttons will effect the passenger side one so only replace the drivers side, they usually just pop out easily, pry up gently from one end or the other.

if you talking about door latch wont let door close.try to reset all door locks.first if you cant get door close.work unlock button with remote or door switch.then hold open door handle while you flat screw driver pull up latch in door latch should stay up so door will close.once get door close.try resetting all door locks by sitting inside vechicle with all doors close.remove key from ignition.open drivers door.wait 24 seconds.turn ignition switch on and back to lock position 3 times.press and release drivers door courtesy light 3 times.ensure doors lock and unlock.if not wait 40 seconds and repeat procedure.if this procedure fails. you have problem in the door latch and lock mechanism inside the door itself.

How do you know the replacement switches were good? These actuators work in a series...One could be defective, causing the others (including drivers door) to not work...Also try cleaning all contact points with PB Blaster, and wipe dry...Hope this helps.

This is the key security system. Somehow youv'e set it off. Used the wrong key tried to open the door with the alarm on. Opened the door or trunk from the inside after locking it from the outside. If your the real owner of the car it'll be no problem to get it fixed. If you have the correct key lock the doors from the outside with the key and lock it twice ( the doors ( all of them ) should lock). Leave the car alone for a minute, maybe 5. Then unlock the door twice, all the doors should unlock the second time. Enter the car and start it with the key. If you with a remote door lock fob that can work too. If this fails then try a different door or even the trunk. Sometimes the driver doorlock switch wears out or gets ice in it and unlocking a different door or useing the remote can get you going again.

any shop with a scanner will disable them for you

your door lock actuators are bad.there electronic and are right costly

u r on ur child lock u deactivat ur child lock .

For the sliding doors you need to clean the contacts, there are 6 or 8 on both sides, just wipe them clean as they are probably covered in oil/grease/grime.