See also:

XM Categories
XM channels are organized in categories. Removing or Adding Categories Channels in a category that have been removed can still be accessed by using the SEEK or SEEK buttons, or the TUNE knob. ...

EPB Apply
The EPB can be applied any time the vehicle is stopped. The EPB is applied by momentarily lifting up on the EPB switch. Once fully applied, the BRAKE light will be on, and the DIC message PA ...

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 ...