I think this procedure is in the radio manual, but I often change this setting so I can help out...
On the radio unit, there is a button that looks like a music note. Press it (4 times I think) until it displays "FAD v 0 ^" - those are up and down arrows: up=front, down=rear. Use the seek button on the handle control... left seek=rear fade, right seek=front fade.
Do so until you get the balance you want. You can hit the music note again until it displays the station/cd track, or it will reset itself if you push no button for something like 8 seconds.
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