GM Service Manual Online
For 1990-2009 cars only

Connecting the scan tool to the data link connector (DLC) allows the scan tool to communicate with the following control modules:

    • The powertrain control module
    • The vehicle control module
    • The inflatable restraint sensing and diagnostic module
    • The transfer case shift control module
    • The electronic brake control module
    • The body control module
    • The instrument cluster

Monitor system operations for diagnostic purposes by connecting the scan tool to the DLC.