2004 Hummer H2 Owner's Manual - Page 197

Radio with Cassette and CD AUTO VOL (Automatic Volume): With automatic volume, your audio system will adjust automatically to make up for road and wind noise as you drive by increasing the volume as vehicle speed increases. Set the volume at the desired level. Press this button to select LOW, MEDIUM, or HIGH. AVOL will appear on the display. Each higher setting will provide more volume compensation as vehicle speed increases. To turn automatic volume off, press this button until AVOL OFF appears on the display. DISPL (Display): Press this knob to switch the display between the radio station frequency and the time. Time display is available with the ignition turned off. For RDS, press the DISPL knob to change what appears on the display while using RDS. The display options are station name, RDS station frequency, PTY, and the name of the program (if available). To change the default on the display, press the DISPL knob until you see the display you want, then hold the knob for two seconds. The radio will produce one beep and the selected display will now be the default. Playing the Radio PWR (Power): Press this knob to turn the system on and off. VOL (Volume): Turn this knob to increase or to decrease volume. 3-63