Grand Caravan FWD V6-3.3L VIN 3 Flex Fuel (2002)
Body Control Module: Description and Operation
System Description
SYSTEM DESCRIPTION
The body system on the 2003 RS and RG 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 modules. 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.
