2002 GMC Yukon Owner's Manual - Page 199

AM-FM Stereo with Compact Disc Player and Automatic Tone Control (If Equipped) SCV (Speed-Compensated Volume): With SCV, your audio system adjusts automatically to make up for road and wind noise as you drive. Set the volume at the desired level. Turn the control ring behind the upper knob clockwise to adjust the SCV. Each notch on the control ring allows for more volume compensation at faster vehicle speeds. Then, as you drive, SCV automatically increases the volume, as necessary, to overcome noise at any speed. The volume level should always sound the same to you as you drive. If you don't want to use SCV, turn the control all the way down. RECALL: Pressing this button will display the station being played or it will display the clock. Clock display is available with the ignition turned off. Playing the Radio PWR (Power): Press this knob to turn the system on and off. VOL (Volume): Turn this knob clockwise to increase volume. Turn it counterclockwise to decrease volume. The knob is capable of rotating continuously. Finding a Station AM FM: Press this button to switch between AM, FM1 and FM2. The display will show your selection. TUNE: Press this knob lightly so it extends. Turn it to choose radio stations. Push the knob back into its stored position when you're not using it. 3-19