I can unlock/lock driver side doors with the switch on both the drivers side and the passenger side but neither door on the passenger side will unlock/lock at all with any switch. I have to manually unlock them. What could be the problem or reason why this is happening?

 

It could be several things. The switch sends a signal to the body control module and then the BCM sends the signal to unlock the door.

You would probably get faster (and better) answers if you posted this question in the 6th gen forum.