have a 2001 gmc jimmy and while driving down hiway i heard all my door locks pop up.when i went to lock them again nothing worked.Tryed using the key fob as well as the drivers door master powwer lock but got no response from either.checked 3 amp fuse under the hood.it was fine but changed it anyways.still nothing.Poer mirrors still work but only way to lock doors is to manually push down each one individually which means i cant lock my hatch.something is also drawing power when the vehicle is shut of because when i leave it overnight the battery gets run down..also,after locking the doors if i walk up to drivers door and pull up on the handle on the outside i can hear the drivers door lock pop back up unlocking the door without putting the key in door lock or anything.Does anyone have any ideas on what this could be?thanks for any help