OnStar

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Different Size Tires and Wheels
If wheels or tires are installed that are a different size than the original equipment wheels and tires, vehicle performance, including its braking, ride and handling characteristics, stability, and r ...

Radio(s)
: Press to turn the system on and off. Turn to increase or decrease the volume. RADIO/BAND or SRCE: Press to choose between FM, AM, or XM™, if equipped. TUNE/MENU: Turn to select radio stations. ...

Programming without a Recognized Transmitter (Keyless Access Vehicles Only)
If there are no currently recognized transmitters available, follow this procedure to program up to five transmitters. This feature is not available in Canada. This procedure will take appro ...