The multi-band antenna is on the roof of the vehicle. The antenna is used for AM-FM radio, OnStar, the SiriusXM satellite radio service system, and GPS (Global Positioning System), if the vehicle has these features. Keep the antenna clear of obstructions for clear reception.
If the vehicle has a sunroof, and it is open, reception can also be affected.
OnStar Additional Information
In-Vehicle Audio Messages
Audio messages may play important
information at the following times:
Prior to vehicle purchase.
Press to set up an account.
With the OnStar Basic Plan,
every 60 days.
After change in ownership and
at 90 days.
Transferring Service
Pres ...