1997 GMC Jimmy Owner's Manual - Page 163

To help avoid hearing loss or damage: Ad-just the volume control to the lowest setting. I NOTICE: ~ Before you add any sound equipment to 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 1 it properly. Added sound equipment may interfere ' with the operation of your vehicle's engine, Delco radio 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 andbe sure to check Federal rules covering mobile radio and telephone units. -- --