GM Service Manual Online
For 1990-2009 cars only

Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information:

    • The identification of the control modules which command the system
    • The ability of the control modules to communicate through the serial data circuit
    • The identification of any stored DTCs and the codes status

The use of the Vehicle Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.