Communication System Overview

SELF DIAGNOSTIC ELECTRICAL NETWORK
Aboard this vehicle are electronic components which can be controlled by the service technicians to provide valuable self - diagnostic information. These components are part of an electrical network, designed to control various engine and body subsystems. A description of each of these subsystems will be found in the appropriate sections. However, this section will provide a description of the overall electronic network and the on - car diagnostic capabilities which have been designed to aid the service technician in system repair.

INSTRUMENT PANEL CLUSTER
At the heart of the computer system is the Instrument Panel Cluster (IPC). It has an internal microprocessor which is the center for communication with all the other components in the system. System sensors and switches are monitored by the IPC or one of the other major components that complete the computer system. These components are:

1. Powertrain Control Module (PCM)

2. Air Conditioning Programmer (ACP) - HVAC

3. Diagnostic Energy Reserve Module (DERM) - Supplemental Inflatable Restraint System

4. Electronic Brake Control Module (EBCM)

5. Road Sensing Suspension Module (RSS)

DATA LINE
A combination of inputs from these major components and the other sensors and switches communicate with the IPC, either as individual inputs, or on the common communications link, called the data line (CKT 800). The various inputs to the IPC combine with program instructions within the system memory to provide accurate control over the many subsystems involved.