CAN-bus is the type of data line modules use to communicate. Messages are sent between different modules on a pair of wires instead of all modules being hard wired to sensors. In other words, for example, the speed sensor info is used by many modules, IPC for speedo, ECM for fuel and ignition, TCM for shift points, or in your case the PSCM for steering feel. Having a single module pickup the data from a sensor it can then send that info on to other modules that need it over the data line. The problem you may run into as I briefly mentioned in my first post is that when vehicles are built, the modules are calibrated to send and receive data to and from other modules, so they are always looking for each other on the data line. Using just the ECM, PSCM, and BCM in your case may not be sufficient to make the system work as designed if another module needs to contribute something to the data stream. I'm not trying to scare you I'm just trying to give you the best info as I know it.
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