See also:

Setting the Clock (Radio with CD and Touchscreen)
The clock is in the center stack display. To set the time: 1. Press the CONFIG button to enter the menu options or press . Turn the TUNE/MENU knob to scroll through the available setup features. ...

At Least Once a Month
Tire Inflation Check Visually inspect your vehicle’s tires and make sure they are inflated to the correct pressures. Do not forget to check the spare tire. Tire Wear Inspection Tire rotation ...

OnStar Personal Identification Number (PIN)
A PIN is needed to access some of the OnStar services, like Remote Door Unlock and Stolen Vehicle Assistance. You will be prompted to change the PIN the first time when speaking with an Advi ...