Aux IN Music CD Interface Adapter Audio Jack Cable Lead Compatible with Samsung Galaxy, HTC ONE, Huawei, Sony Xperia Lumia, LG Phone, MP3 Player to Mazda 6, 3, 5, 2, MX5, RX8, M6, M3, Besturn B70

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AUX is probably 80% of CD volume, annoying when driving with the top down, as you really do need it up loud, and I've got DSP (10 speakers). The final result is a lot more elegant, however, with the unit able to switch over to auxiliary input at the touch of a button. The big problem was decoupling the panel module from the power source, because it inputted a tremendous amount of noise to the amp. Connect the left and right channels of the AUX cable to IN2_L and IN2_R using factory 1uF SMD capacitors (C153 and C154).

You can splice in to the wires going into those pins either by cutting in and soldering, or use non-solder tap connectors. I'd have a fiddle with the cable maybe, I know when I made my own, it was very fussy with the connection to the pins. This way, you can pump in the latest tunes from your smartphone without a fuss, while still maintaining an all-original look on the dash.That said, the Bluetooth FM transmitters I’ve tried (like this one) are usually adequate enough that I can enjoy the music still. Couple that with different coupons that you can collect, and you'll be getting a really good deal on adapter.

Bluetooth audio really wasn’t a thing yet at that point) but I could use my MP3 player direct via headphone jack output. I have the service manual and schematics on the unit, just need a little help finding and adjusting the MUX?

This is on top of the job of wiring in the auxiliary input into the tape, CD, or other audio input subsystem.