How to install an Auxiliary Audio input so you can play your IPOD, DVD(audio only), MP3 player or XFM(satellite radio). Basically anything with a headphone jack. ( With NAV or Without NAV 1998-2002 RX-300) This step by step installation (with pictures) will allow you to control the audio using the Lexus factory radio. So yes, you Can adjust the volume, left/right, front/back, Bass/Mid/Treble, and keep all the factory features it already had. I got tired of using the FM transmitter and the cassette connection because of the hiss so I had to find a better solution. After spending $80.00 on the electrical drawings for the RX-300 , I found the cheapest, easiest and most efficient way to do it. So you only have to pay a fraction of the cost and you get the pictures and step by step procedures. Its Easy! What is really cool is you DON'T have to remove the radio, or the center console or the CD changer! After following this procedure you will soon be hearing your MP3 through the great stereo system that Lexus put in our cars.! (The document is in the form of a word document and is about 3.3meg unzipped)