** Do It Yourself **
Hi everyone. I see this thread has been going for nearly 4 years. Hot topic! Maybe it's old stuff for some of you, but I just bought my first Mazda, a used 06 M3, so I'm new to this forum. I needed (OK, "wanted") to add an mp3 player, and found this forum by chance. Great info, thanks to all who contributed.
A couple people in this thread have asked about Do-It-Yourself aux connection. If all you need is the aux audio input, and no iPod control, and if you can solder, then you can activate the aux input almost for free, you just need a couple easy-to-get parts. I have an old Creative Zen mp3 player (still works great), that I have successfully connected to my head unit through the CD-Changer port.
Note: this was done on a 2006 M3, with the standard (non-Bose) head unit. I have not tried this on any other model.
You'll need some wire, some shielded audio cable with a 3.5mm male jack to connect to your mp3 player headphone jack, and a connector to fit the CD-Changer port on the back of the head unit, and that's all! For the connector, a standard 0.1" spacing 2x8 female header will fit, like this:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=A26458-ND or any equivalent part. Obviously the shape of this connector doesn't match the Mazda head unit, but the electrical connections match and it fits snuggly enough so it won't vibrate off. If you have a dead CD Changer then you can salvage the proper connector from that.
Refer to the diagram posted in this thread by "TheMan" way back in 10-01-2006, on the first page.
1) Solder a short piece of wire from pin 2M to 2A. This makes the head unit think there's a CD changer connected, and enables the "MEDIA" button.
2) Solder your headphone cable right channel, to pin 2C.
3) Solder your headphone cable left channel, to pin 2E.
4) Solder your headphone cable shield, to pins 2D and 2F together.
The "MEDIA" button on the head unit will activate the aux port, and the car's LCD display will show "AUX".
Note that pin 2O (2-oh) on the connector provides a switched 12V signal, but this cannot power an mp3 player directly. This pin is intended to control an electronic power switch in the CD-Changer. If you need switched power for your player, you can tap off the head unit main harness.
My Creative Zen runs on 5V, so I put a 5V voltage regulator on the back of the head unit (just fastened it on the outside of the chassis) and ran a cord out along side the headphone cable to the mp3 player. I got the switched 12V from the main harness as described above, to power the 5V regulator, and so the Zen will power itself down when the car's ignition is turned off. There is no hum or buzz, audio quality is excellent.