Read this thread.

http://www.xoutpost.com/bsws-mobile-e...dsp-audio.html
If you follow this you will need a cable from Tom G that connects the 6 pin at the cd changer to the open 10 pin in the tuner below the spare tire beside the battery. ( 25 bucks )

This method works but depending on the quality and placement of the HI-LOW converter you use , you might get some engine noise.