Pontiac montana locks and unlocks randomly

most gm cars engage the door locks when the vehicle is in gear and is up to 12 miles per hour. Not aware of an ease way to prevent the locks from engaging when moving. Really can be annoying but not such a bad thing these days with car jacking and other crimes to have the doors lock.

If you cannot manually unlock the door, use a rubber hammer and firmly rap the door at the striker/lock area while manually sliding the lock/unlock switch to unlock,it may take a few tries but should unlock.DO NOT lock the door again until you have lubed the lock assembly and are happy with it's operation.If it's an electric lock fail to unlock/lock,with the door open use steel wool on the door post electrical door contact pads once in a while.

Horn goes off when ? Vehicle just sitting , going down the road ? Same with locks ? If when going down the road , could have a bad door ajar switch ! Is there a light of a picture of a car with door open lit on the instrument cluster ? Door Locks Go Crazy 1

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.

Your door lock actuator is no good any more and needs to be replaced.

any shop with a scanner will disable them for you

Dave, it would appear that at one point one of the manual locks were forced either to unlock or lock and has now repositioned the nuetral point at a different location on the locking rod, hence, sending false readings to the control unit to either unlock or lock, I would try this, close all doors and manually lock them see which lock lever look unlike the rest in that position, this will be the culprit and have to be reset on the rod behind the door trim panel. This advice is as best as I can give without manually seeing the car. Drive safely

IMPORTANT: Before entering programming mode, have in possession all of the transmitters you will be using on the vehicle. Once you program the transmitter, all previous codes will be erased from the memory. The other transmitters will not be functional until you program the transmitters again.
1. Close all vehicle doors.
2. Insert the key into the ignition.
3. Hold down the power UNLOCK button on the driver’s door panel-continue to hold down until instructed to release.
4. Perform steps 5 through 8 in fairly rapid succession.
5. Turn the ignition switch to the ON position (as far as you can go without starting the engine).
6. Turn the ignition switch to the OFF position.
7. Turn the ignition switch to the ON position.
8. Turn the ignition switch to the OFF position.
9. Release the power unlock button on the door panel. The vehicle will lock and unlock the doors automatically.
10. Hold down the LOCK and UNLOCK buttons on the transmitter simultaneously until the door locks and unlocks. This step may take up to 30 seconds.
11. Repeat the previous step for each additional transmitter (including any existing transmitters).

sounds like your bcm is internally malfunctioning

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