See also:

Theft-Deterrent Systems
Vehicle theft is big business, especially in some cities. Although your vehicle has a number of theft-deterrent features, we know that nothing we put on it can make it impossible to steal. ...

Alarm Warning
Press the customization button until ALARM WARNING: BOTH appears in the display. To select your preference for alarm warning, press the select button while ALARM WARNING: BOTH is displayed on the ...

Add-on Electrical Equipment
The OnStar system is integrated into the electrical architecture of the vehicle. Do not add any electrical equipment. See Add-On Electrical Equipment. Added electrical equipment may interfer ...