Circuit Operation

There are three data lines that can be accessed with a Scan Tool: the UART Serial Data Line (circuit 800), CLASS 2 Serial Data Line (circuit 1807), and the Theft Deterrent Serial Data Line (circuit 728). Circuit 800, UART Serial Data Line, is the Powertrain Control Module (PCM) data line. It allows the PCM, Inflatable Restraint Diagnostic Energy Reserve Module, Electronic Brake Control Module (EBCM) (if equipped), and Heater-A/C Control (if equipped) to communicate by transmitting data through CKT 800. Circuit 1807, Class 2 Serial Data Line, is to the PCM. It allows the PCM to communicate by transmitting data through CKT 1807. Circuit 728, Theft Deterrent Serial Data Line, allows the Scan Tool to test the functions of the Theft Deterrent Module. System operations can then be monitored for diagnostic purposes through the Scan Tool for each Serial Data Line.