Diagnostics

OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System. If a diagnostics check is needed between e-mails, push OnStar Additional Information , and an Advisor can run a check.

    See also:

    Underbody Maintenance
    Chemicals used for ice and snow removal and dust control can collect on the underbody. If these are not removed, corrosion and rust can develop on the underbody parts such as fuel lines, frame, fl ...

    Tire Rotation
    Tires should be rotated every 12 000 km (7,500 mi). See Scheduled Maintenance . Tires are rotated to achieve a uniform wear for all tires. The first rotation is the most important. Any time unusua ...

    Setting the Tone (Bass/Midrange/Treble)
    BASS/MID/TREB (Bass, Midrange, or Treble): The radio may display some or all tones, such as BASS, MID, and TREB. To adjust the tone settings, press the knob until the tone control tabs displa ...