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:
Operating UHP Using Voice
Control
The voice control of the UHP
system enables you to operate
several functions of the mobile
phone using your voice. The UHP
system uses voice commands to
control the system and dial phone
n ...
Infotainment System Overview
The infotainment system in the vehicle is a touch screen system. It is controlled
by touching the screen buttons, the TUNE/MENU knob, preset buttons, and other buttons
on the faceplate.
The TUNE/ ...
Adjusting the Treble, Midrange,
and Bass
1. Press the TONE button.
2. Select Treble, Midrange,
or Bass.
3. Select the value.
Press the BACK button to go
back to the Tone Settings menu. ...