Buick 2001 Century - Manual (Page 126)

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OnStar System Limitations
Complete limitations can be found on the Subscriber
Services Agreement.
OnStar Service is:
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.
Global positioning capabilities used to deliver
OnStar Service 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.
Safety and security services are provided by existing
governmental emergency service providers. OnStar
will use reasonable efforts to contact the appropriate
emergency service provider and request assistance but
cannot promise that they will respond to the call in a
timely manner or at all.