See also:

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 v ...

XM Weather
Press the Weather screen button to display the Current or Extended Forecast Weather. The Extended Forecast Weather screen displays five days of the forecasted weather at the vehicle’s current posit ...

Uniform Tire Quality Grading
Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width. For example: ...