I was thinking about doing something like this for the longest time but until I found this thread I didn't realize how easy it would be. I managed to get this working with the Audiolink Ipod adapter on my Mazda6.
The pinout was slightly different but a 5V TTL-USB worked great. Had to mess with the Girder settings for awhile before I got something to work consistently. I haven't quite gotten it 100% perfect since I can't hit my steering wheel controls in rapidly or leave them held down to scroll quickly but it's good enough for now.
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