2010 Hummer H3T Owner's Manual - Page 25

In Brief The vehicle must have a working electrical system, including adequate battery power, for the OnStar equipment to operate. There are other problems OnStar cannot control that may prevent OnStar from providing OnStar service at any particular time or place. Some examples are damage to important parts of the vehicle in a crash, hills, tall buildings, tunnels, weather or wireless phone network congestion. 1-21 Additional OnStar Controls 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. Press Q and request a vehicle diagnostic. If the light appears clear (no light is appearing), your OnStar subscription has expired and all services have been deactivated. Press Q to confirm that the OnStar equipment is active. The vehicle may have a button, located on the driver side of the instrument panel near the headlamp controls, that can be used to interact with OnStar. Use this button to dial numbers into voicemail systems or to dial phone number extensions. See the OnStar Owner's Guide for more information.