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 diagnostic check. If the light appears clear (no light appears), your OnStar subscription has expired and all services have been deactivated.
Push to confirm that the OnStar equipment is active.
See also:
Radio(s)
: Press to turn the system on and
off. Turn to increase or decrease the volume.
RADIO/BAND or SRCE: Press to choose between FM, AM, or XM™, if equipped.
TUNE/MENU: Turn to select radio stations. ...
Transferring a Call
Audio can be transferred between
the Bluetooth system and the cell
phone.
The cell phone must be paired and
connected with the Bluetooth
system before a call can be
transferred. The connect ...
Engine Cooling When Trailer Towing
The cooling system may temporarily overheat during severe operating
conditions. See Engine Overheating . ...