1998 GMC Jimmy Owner's Manual - Page 179

To unlock a secured radio, see "Unlocking the Theft-Deterrent Feature After a Power Loss" earlier in this section. To help avoid hearing loss or damage: 0 Adjust the volume control to the lowestsetting. Increase volume slowly until you hear comfortably and clearly. Understanding Radio Reception AM The range for most AM stations is greater than for FM, especially at night. The longerrange, however, can cause stations to interfere with each other. AM can pick up noise from things like stormsand power lines. Try reducing the treble to reducethis noise if you ever get it. NOTICE: Before youadd any sound equipmentto your vehicle like a tape player, CB radio, mobile telephone or two-way radio be sure you can add what you want. If you can, it's very important to do it properly. Added sound equipment may interfere with the operation of your vehicle's engine, Delco Electronicsradio or other systems, and even damage them. Your vehicle's systems may interfere with the operation of sound equipment that has been added improperly. So, before adding sound equipment, check with your dealer and be sure to check Federal rules covering mobileradio andtelephone units. -- -0 FM Stereo FM stereo will give you the best sound, but FM signals will reach only about 10 to 40 miles (16 to 65 km). Tall buildings or hills can interfere with FM signals, causing the sound to come and go. Tips About Your Audio System Hearing damage from loud noise is almost undetectable until it is too late. Your hearing can adapt to higher volumes of sound. Sound that seems normal can be loud and harmful to your hearing. Take precautions by adjusting the volume control on your radio to a safe sound level before your hearing adapts to it. 3-28