See also:

Satellite Radio
Vehicles with an XM™ satellite radio tuner and a valid XM satellite radio subscription can receive XM programming. XM Satellite Radio Service XM is a satellite radio service based in the 4 ...

Your Responsibility
Increase the volume of the radio if the OnStar Advisor cannot be heard. If the light next to the OnStar buttons is red, the system may not be functioning properly. Push and request a vehicle diagnos ...

Customer Assistance Offices (U.S. and Canada)
Buick encourages customers to call the toll-free number for assistance. However, if a customer wishes to write or e-mail Buick, the letter should be addressed to: United States Buick Customer ...