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:
Once a Month
• Tire inflation check. See Inflation - Tire Pressure.
• Tire wear inspection. See Tire Inspection and
Rotation. ...
Additives
To provide cleaner air, all gasolines in the
United States are now required to contain additives
that will help prevent engine and fuel system
deposits from forming, allowing your emission
control ...
Horn
Press near or on the horn symbols on your
steering wheel pad to sound the horn. ...