GM Service Manual Online
For 1990-2009 cars only

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

    • The identification of the control module which commands the system
    • The ability of the control module to communicate through the serial data circuit
    • The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of Diagnostic System Check - Remote Keyless Entry will identify the correct procedure for diagnosing the system and where the procedure is located.