windows and locks quit working

There is a tan/white wire that comes from the driver's door and goes to all the other doors. It is a data wire that commands each door module to work the locks and windows. It could be broken and the most likely place is in the rubber boot between the driver's door and the body of the car. There could be other wires broken too that may cause this problem.sparky

You could try resetting the DDM by disconnecting the battery for about 10-15 minutes.

I would try disconnecting the battery for a little while too. That car doesn't have conventional, heavy wires going from one door to another. Inside each door is a "door module," more or less a computer. When the driver (from his switch on the driver's door) tries to roll down a passenger window (or lock/unlock a door), it goes like this: --A short wire goes from the driver's window (or doorlock) button, to the driver's door module. --The driver's door module communicates (via the tan/white wire sparkie mentioned) with the other door modules in the car. --Through that data wire, the DDM (driver's door module) commands the other door to roll its window down, lock its door, etcetera. --It's not fully clear why GM built the car this way, but it's probably either to save money, weight, or both. While it's possible for a door module to fail, I would doubt that all three passenger door modules failed at the same time. I would check ALL fuses in the car, both underhood and under the back seat. Probably, either the passenger door modules aren't getting power, or maybe there's a break in the data line somewhere.