Body Control System

SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION
The body system on the Viper Coupe and Roadster consists of four modules. The Airbag Control Module (ACM), the Electronic Entry Module (EEM), and the Powertrain Control Module (PCM) which communicate over the Chrysler Collision Detection multiplex system (CCD Bus), and the Controller Antilock Brake (CAB) which communicates over the Programmable Communication Interface multiplex system (PCI Bus).

PCI Bus Communication
The Controller Antilock Brake (CAB) uses the PCI Bus solely for DRBIII(R) communication and other DRBIII(R) related functions. For diagnosis pertaining to a no response from CAB, refer to Communication under Diagnostic Information and Procedures in this manual. For all other CAB related electrical diagnosis, refer to the Chassis Diagnostic Procedures manual.

CCD Bus Communication
Binary coded messages containing instructions and information about the operation of various vehicle components and circuits is quickly organized, controlled, and transmitted to each of the modules connected to the CCD Bus. The binary coding process ensures that each of the modules respond only to the messages that are addressed to it. This method of data transmission significantly reduces the complexity and the size of the wiring harnesses installed in the vehicle. Additionally, the ACM and the EEM use the CCD Bus for DRBIII(R) communication and other DRBIII(R) related functions.