MP3 player help... I know i know....
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CHEAP, HARD(ER) TO REVERSE: You could use cut the left, right, and ground wires (3 wires) from the cd changer a couple inches before it enters the harness, and use butt splices to connect a very long RCA/phono jack to the cut wires still connected to the harness. (Combine the L and R grounds to make 3 wires.) Then snake the RCA/phono jack to where you want it in the car. Cheap, but trickier to reverse back to stock. The audio signal wires are shielded, with tiny core wires, making butt-splices tenuous. You'd probably want to break out the soldering gun to reverse this one.
CHEAP, EASY TO REVERSE: I used 2 PIE AA3-HAR's and 1 Blaupunkt RCA Aux Input Adapter. I needed two 2 PIE's, because the PIE's do not come with the blue cd changer harness on the head unit side. The Blaupunkt RCA Aux Input Adapter has the blue harness that clips directly onto the other two (green/yellow) on the PIE, but only has 3 wires (left,right,ground) -- no pass-through wires for the head unit to keep communicating with the cd changer. The head unit needs to communicate with the cd changer in order for it to enter and stay in the cd changer mode. So I got a second PIE to salvage it for wires -- or you can find another source for wires and Mini-ISO male/female terminators. I used a couple tiny paper clips to disengage the terminators from the harnesses of the second PIE, which left me with enough wires with terminators to simply plug the male ends into the inner most holes of the red harness of the PIE and the corresponding holes on the blue harness of the Blaupunkt RCA Aux Input Adapter. Then, it's just plug and play -- the red end of the PIE/Aux adapter clips to the stock head unit harness and the multi-color end goes into the head unit. That's it for setup. This is what I did, but I was to do it again, I'd probably just cut the wires instead of all this adapter/harness juggling. Then again, I learned a lot on the way.
PIE: http://enfigcarstereo.com/shopsite_sc/store/html/PIE_AA3_HAR.html
AUX: http://cgi.ebay.com/Blaupunkt-RCA-Aux-Input-Adapter-iPod-XM-XBox360-MP3_W0QQitemZ190225048532QQihZ009QQcategoryZ1498QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem
For both above approaches, put a blank CD or <insert crappy band here> cd in your cd changer (so the head unit has something to "play"). Plug the Aux end of your new adapter into your Sansa, turn on the Sansa, (wait a couple min for the Sansa to boot -- they take so long!!!), put the Sansa on max volume, and switch the head unit to CD.
MUCH EASIER: Get an Ice-link, GROM, or other pre-made solution. The benefit is that most do not need the CD Changer still installed, so will let you sell your CD Changer to offset the cost of the adapter. Some used to be outrageously priced for what you wanted it to do, but a couple are now (more) reasonably priced and you can find some used for fantastic prices.




