Communication System Diagnostics

Before proceeding to the network index charts to diagnose a network Diagnostic Trouble Code (DTC):
^ Review equipment level of vehicle.
^ Make note of module and systems with which the vehicle is not equipped.

Before performing to a pinpoint test:
^ Make sure DTC being diagnosed is referencing a module or system with which the vehicle is equipped.
^ The New Generation Star (NGS) tester may produce a network DTC for no communication if the vehicle is not equipped with the suspect module or system.
^ The New Generation Star (NGS) tester will interpret a not equipped module as a communication failure.
^ If a DTC is retrieved for a not equipped module or system, disregard this DTC.
^ If a not equipped DTC is the only DTC retrieved the communication system, self test is considered passed.