Circuit Operation

There are two data lines that can be accessed with a scan tool. The Serial Data Line (UART) (800 CKT) allows the scan tool (when connected), Powertrain Control Module (PCM), Instrument Cluster (I/P), Diagnostic Energy Reserve Module (DERM), and the Electronic Brake Control Module (EBCM) to communicate via serial data. The Serial Data Line (Class 2) (1807 CKT) allows a scan tool to directly access the Powertrain Control Module to read emissions related information. A scan tool can gain access to both data lines through the Data Link Connector (DLC). System operations can then be monitored or controlled for diagnostic purposes.