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Oh and to further clarify, by CAN Bus and sending signals and so forth, means that the switches send SIGNALS to do what you want things to do, not like you are sending battery voltage around the car like in the old days. To simplify and make it a bit easier to understand, say you press the switch to lower the drivers window. The lower control unit (switch pack), sends out data saying "UH, OK everybody, I need the drivers window lowered". The drivers DCM (door control module), say's "Uh yeah, ok, that's my job, I'll get right on it", the DCM then is the module that provides the power and ground to lower the window. They can send a lot of data on just 2 wires, all over the car, and the heavy wires that actually do the job are much shorter, in this case form the dcm (inside the drivers door) direct to the motor, which is only about a foot away, instead of all the heavy wires from the switch to the console to the door.
Gilly
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