The least expensive way is to get a Peripheral PXDX
http://www.abt.com/product/18137/Peripheral-PXDX.html then get a charge cable with mini plug then get a mini plug to RCA adapter to plug into the PXDX.
I use the PXDX with a JL Audio CL-SES to rout audio from my nav, iPhone, CB, Sirius and video system into the aux input. The will not work for peeps with in-dash CD changers.
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2006 CRD
http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.