I have a 2005 Chevy Uplander LS. I replaced the lock switch on the drivers door already figuring it was not relaying to the other locks properly. worked for awhile and now its back to its old self. I can use the fob and it will always unlock the drivers side door, but intermittently it will not unlock any other doors uncluding the lift gate. and there is no key option for the lift gate. so i have to manually unlock the other 3 doors, but the lift gate there is nothing i can do to unlock that, if i put the vehicle in drive then drive a bit, it does the auto locks, then when i park it will unlock ALL doors. The switch i replaced in drivers side door, if i press unlock it does not unlock the other doors either. you can hear it sending the signal to the doors but doesnt actually unlock the other doors. Is this a PCM issue? or something else?