RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Body Control Module: Description and Operation
Body Control System
SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION
The Body System on the 2002 DR Ram Truck consists of a combination of modules that communicate over the PCI bus (Programmable Communication
Interface multiplex system). Through the PCI bus, information about the operation of vehicle components and circuits is relayed quickly to the
appropriate module(s). All modules receive all the information transmitted on the bus even though a module may not require all information to perform
its function. It will only respond to messages "addressed" to it through binary coding process. This method of data transmission significantly reduces the
complexity of the wiring in the vehicle and the size of wiring harnesses. All of the information about the functioning of all the systems is organized,
controlled, and communicated by the PCI bus.
