GM Service Manual Online
For 1990-2009 cars only

The diagnostic scan tool becomes part of the vehicle's electronic system when plugged into the Data Link Connector (DLC). The scan tool can perform the following functions:

    • Display the MAGNASTEER® data
    • Display and clear any MAGNASTEER® diagnostic trouble codes
    • Control the MAGNASTEER® components
    • Perform extensive MAGNASTEER® diagnosis
    • Provide diagnostic testing for intermittent MAGNASTEER® conditions

Each test mode has specific diagnostic capabilities which depend upon various keystrokes. The keys on the scan tool completes the following functions:

    • Select operating modes.
    • Perform functions within an operating mode.
    • Enter Diagnostic Trouble Code (DTC) or model year designations.

For more scan tool diagnostics, refer to the scan tool owners manual.