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:

    â€¢ The powertrain control module
    â€¢ The vehicle control module
    â€¢ The supplemental inflatable restraint sensing and diagnostic module (SDM)
    â€¢ The transfer case shift control module
    â€¢ The electronic brake control module
    â€¢ The body control module
    â€¢ The electronic climate control module
    â€¢ The memory seat module
    â€¢ The instrument cluster

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