C5: OBD2 Basteleien

[Thomas V]

Aus dem eSi:

The following modules communicate on the class 2 serial data circuit:

Body Control Module (BCM)
Electronic Brake Control Module (EBCM)
Electronic Suspension Control (ESC)
HVAC with CJ2
Sensing and Diagnostic Module (SDM)
Instrument Panel Cluster (IPC)
Driver Door Module (DDM)
Passenger Door Module (PDM)
Seat Control Module (SCM) with AAB
Powertrain Control Module (PCM)
Radio
Remote Control Door Lock Receiver (RCDLR)


Some electrical system components are directly connected to and controlled by their system control module. Others systems accomplish the control functions by sharing data information with other system control modules on the serial data circuit to execute various vehicle functions. All system data information from sensors, switches, etc. can be monitored by any system module that is connected to the serial data circuit. Communications between each system control module is accomplished by sending a digitally coded message consisting of specific information. Communicating data information with other system control modules on the same serial data circuit, either input information or specific program information, provides more accurate and reliable computer system control functions.

All system control modules on the same serial data circuit use a communication process similar to a telephone system, where enormous amounts of information can be exchanged on a single data wire. The serial data circuit is used to communicate information between each system control module. Each system control module is assigned a specific recognition code, called a source ID. This code is used to identify which module is communicating on the serial data circuit. When a message is sent out on the serial data circuit , the recognition code will identify which particular module sent the message. These messages contain specific information, or commands, a system control module requires to function properly.