Diagnostic Starting Point - Lighting Systems

Begin system diagnosis with A Diagnostic System
Check - Lighting Systems. The Diagnostic System
Check will provide the following information:
^ The identification of the control module(s) which command the system.
^ The ability of the control module(s) to communicate through the serial data circuit.
^ The identification of any stored Diagnostic Trouble Codes (DTCs) and their status.
The use of the Diagnostic System Check will identify he correct procedure for diagnosing the system and where the procedure is located.