2004 Dodge Caravan Owner's Manual - Page 161

UNDERSTANDING YOUR INSTRUMENT PANEL 161 AM Reception AM sound is based on wave amplitude, so AM reception can be disrupted by such things as lightning, power lines and neon signs. FM Reception Because FM transmission is based on frequency variations, interference that consists of amplitude variations can be filtered out, leaving the reception relatively clear, which is the major feature of FM radio. NOTE: On vehicles so equipped the radio, steering wheel radio controls and 6 disc CD/DVD changer if equipped, will remain active for up to 45 seconds after the ignition switch has been turned off. Opening a vehicle front door will cancel this feature. SALES CODE RAZ-AM/ FM STEREO RADIO WITH CASSETTE TAPE PLAYER, CD PLAYER AND CD CHANGER CONTROLS - IF EQUIPPED 4 Operating Instructions - Radio NOTE: Power to operate the radio is controlled by the ignition switch. It must be in the ON or ACC position to operate the radio.