i just got a 97 exploerer xlt as my new dd, and it came with a sony 10 disc cd changer that is mounted in the center console. when i put cds in, it i can hear the motor move to the first cd, but i dont know how to get it to play them lol. if i hit the CD button on the radio it tells me "NO DJ". any one know how to get this thing to play a cd for me?