RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN C (2002)
Body Control Module: Description and Operation
Body Control System
SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION
The body system on the 2002 Ram Truck consists of several modules that communicate over the CCD bus (Chrysler Collision Detection multiplex
system). There are three additional modules, two types of Powertrain Control Modules (PCM) and the Controller Anti-Lock Brake (CAB) that are not
part of the body system, but do utilize the CCD bus for communication. The CAB also utilizes the bus for diagnostics. The PCM sends and receives
messages on the CCD bus, however diagnostics are performed through the Serial Communication Interface or SCI, the same as last year. All of the
information about the functioning of all the systems is organized, controlled, and communicated by the CCD bus.
Through the CCD 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 the information to perform it's function. It will only respond
to messages "addressed" to it through a binary coding process. This method of data transmission significantly reduces the complexity of the wiring in the
vehicle and the size of wiring harnesses.
