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:
Sensors
The solar sensor, located on top of the instrument panel near the windshield,
monitors the solar heat.
The climate control system uses the sensor information to adjust the temperature,
fan speed, ...
General Information
For service and parts needs, visit your dealer. You will receive genuine GM parts
and GM-trained and supported service people.
Genuine GM parts have one of these marks:
...
Rear Compartment Fuse Block
The rear compartment fuse block, if equipped, is located on the left side of
the trunk behind a cover.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
...