1994 GMC Suburban Owner's Manual - Page 151

NOTICE: Before youadd any sound equipment to your vehicle - like a tape player, CBradio, mobile telephoneor 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 radio or other operation of your vehicle's engine, Delco@ systems, and even damage them. And, your vehicle's systems may interfere with the operation of sound equipment that has been added improperly. So, before adding sound equipment, check withyour dealer and be sure tocheck Federal rules covering mobile radio and telephone units. How to Operate Your AM ETR Radio To Play the Radio Press the PWR-VOL-TONE knob to switch the radio on and off. This knob does two other things: It controls the volume. Rotate the VOL knob clockwise to increases the volume. 0 The knob behind the PWR-VOL knob is the TONE knob. Rotate this knob clockwise formore treble and counterclockwise formore bass. 3-13