I've searched the forums and I've searched Google but haven't really found anything rock solid or how to test these door lock systems. I've got a 2007 uplander and it will randomly lock and unlock the doors while driving, the window wouldnt go up or down as well. I fixed my window problem and found a couple broken wires in the door harness in the door jam. Unfortunately it didn't fix my door locks. I've pulled the harness back a ways and haven't found any more breaks. The drivers side door will lock the door but will not unlock them. The passenger side door will not lock or unlock. I can command the doors to unlock/lock with a scanner. If I watch data display and try and unlock the doors it will not switch.