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I believe this is a wiring incompatibility problem. The reason I say this is because when the mp3 player is out the jack which contains switches engages the front L&R and the Rear L&R, when the plug is inserted into the jack the jack switches should remove the audio input to the amplifier and replace it with the audio from the mp3 player. The switches should then send sound to the front L&R and the Rear L&R but the only change should be that the mp3 player is switched in instead of the audio from the raido unit. what is happening is that the jack switches are only switching in the front L&R speakers. This just might be a function of the unit. check the owners manual.
here is a site that has the manual: