Information Bus: Description and Operation

The provision for communicating with the control module is the Data Link Connector (DLC). The connector is usually located under the instrument panel. The DLC is used to connect to a scan tool. Some common uses of the scan tool are listed below:
^ Identifying stored diagnostic trouble codes (DTCs).
^ Clearing DTCs
^ Performing output control tests.
^ Reading serial data.

The Data Link Connector (DLC) contains the following components:
^ The UART serial data line circuit which allows a scan tool to communicate with the following modules for diagnostic and testing purposes:
^ The Electronic Brake Control Module (EBCM) (if equipped with JL9 or JM4)
^ The SDM
^ The Class 2 serial data line circuit which allows a scan tool to communicate with the PCM for diagnostic and testing purposes