2002 Buick Century Owner's Manual - Page 124

OnStar System Limitations Complete limitations can be found on the Subscriber Services Agreement. In order to provide you with excellent service, calls with the OnStar Center may be monitored or recorded. OnStar Service is: Global positioning locating capabilities will not be available if satellite signals are obstructed. OnStar will not function if the vehicle's battery is discharged or disconnected. It may also be inoperative if the vehicle is in an accident and the OnStar or vehicle electrical system components are damaged. OnStar is the communication link between you and existing governmental emergency and roadside service providers. OnStar will receive your call and use reasonable effort to contact an appropriate provider. OnStar cannot promise that the providers will respond in a timely manner or at all. D available in the 48 contiguous United States, Alaska, Hawaii and Canada; D available when the vehicle is within the operating range of a cellular provider; D subject to limitations caused by atmospheric conditions, such as severe weather or topographical conditions, such as mountainous terrain; D subject to cellular carrier equipment limitations. 2-60