See also:

How OnStar Service Works
: This blue button connects you to a specially trained OnStar advisor to verify your account information and to answer questions. : Push this red emergency button to get priority help fro ...

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 ...

Playing from an iPhone®
This feature supports the following iPhone model: • iPhone (3G – 3GS) To use the iPhone, follow the same instructions as stated earlier for using an iPod. ...