We also know that at least our source for power and source for ground is good since we have proper drivers side window and lock operation. I found the black 10/12 gage wire and a yellow 18 gage wire broken in two within the driver side black boot covering the harness into the car body. The DDM and PDM control and integrate many functions and features of the vehicle through both hard wired outputs and messages over the PCI data bus. My 2004Jeep Grand Cherokee driver door locks and all windows stopped working. The PDM also receives inputs through an integral Radio Frequency (RF) Remote Keyless Entry (RKE) receiver. The DDM and PDM each utilize integrated circuitry and information carried on the Programmable Communications Interface (PCI) data bus network along with many hard wired inputs to monitor many sensor and switch inputs throughout the vehicle. Looking through the service information I also come across this- I underlined the important tidbit of information. Both the DDM ( Drivers door Module) and PDM ( Passenger Door Module) share a common power and ground feed as well. It is a peer to peer network meaning that any module on the network has the ability to communicate on it's own. It is very much like GM's Class 2 data buss. All ZJ/WJ/WK Non-modified/stock questions go here - window switch - wiring diagram or info - doing some custom wiring in my zj. The system utilizes door modules in each door that communicate through a data buss called PCI ( Programmable Controller Interface) buss.
