1997 Suburban Door Locks- Help!

[surfbeetle]

My wife's 1997 suburban is having problems with the electric locks unlocking. If you use any of the unlock buttons in the car, front doors or in the cargo area, the doors will all lock. If you use the unlock function, only the driver's door will unlock. The same also happens when using the keyfob remote. When trying to unlock, the manual door switches wiggle a bit but don't unlock, yet the drivers will unlock. I am assuming that the driver's door is on a different circuit because the keyfob remote has a driver's door unlock only button as well as the entire car unlock button. So I am thinking that there must be something wrong with the circuit for the rest of the doors. I just don't know the first place to start troubleshooting.
Thanks

[w6bauer]

Check the rivets on the locking mechanisms in the doors, on my 96 they had rusted out on 2 of the doors and the doors would lock and the manual levers would only wiggle when trying to unlock.