2004 Hummer H2 Owner's Manual - Page 209

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. RCL (Recall): Press this knob to switch the display between the radio station frequency and the time. Press this knob with the ignition off to display the time. To change the default on the display, press the RCL knob until you see the display you want, then hold the knob until the display flashes. The selected display will now be the default. sSEEK t: Press the right or the left arrow to go to the next or to the previous station and stay there. The radio will seek only to stations that are in the selected band and only to those with a strong signal. sSCAN t: Press and hold either SCAN arrow for two seconds until SC appears on the display and you hear a beep. The radio will go to a station, play for a few seconds, then go on to the next station. Press either SCAN arrow again to stop scanning. To scan preset stations, press and hold either SCAN arrow for more than four seconds. PRESET SCAN will appear on the display and you will hear a double beep. The radio will go to a preset station stored on your pushbuttons, play for a few seconds, then go on to the next preset station. Press either SCAN arrow again to stop scanning presets. The radio will scan only to stations that are in the selected band and only to those with a strong signal. Finding a Station BAND: Press this button to switch between FM1, FM2, or AM. The display will show your selection. TUNE: Turn this knob to select radio stations. 3-75