Just ordered a setup online for $80. Plugs into the back of the 6 cd changer and allows all iPod functions to be accessible through the stock head unit. Evidently (not) all the iPod functions show up on the display on the stock unit and the stock unit controls will all work the iPod. (Oh well, see review below) I have an iPod classic which requires output through the 30 pin connector. Choice of black or white cable. I went to Best Buy and they had a similar setup for $150. So I figured about 1/2 price from a reputable co. was a good deal.
gromaudio.com for specs then purchase it through thier eBay store. There's another link here someplace I posted with a link to a video demo of the install. I'll report back once I try it out.
edit:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?t=33735
07/28 update:
I bought the GROM unit ($90 w/cable). It allows the Ipod to play through the stereo nicely but does not control any iPod functions like they say it does. I have to do everything from the iPod itself. None of the radio buttons do anything. On the pro side, all I did was pop out the radio, make one plug in connection to the back of the unit and pop it back into the dash. Ran the wire through the hole in my glove box, plugged it in to the unit and the other end of the cable into my iPod and I was done. Took more time to get the screws out of the factory radio then to install the unit.
They say I can return it since it doesn't do what was advertised but I'm gonna keep it since I don't think most other units will do too much more. So the buttons on the stereo don't control the iPod. It's not that big a deal as I usually just start a playlist and let it play through. I have the iPod in my cupholder on a Belkin mount (under $20) so it's right where I can see the face of it if I need to do anything.
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