Yo G6 owners! Great site, great info!
Just wanted to add a few details of my aux input adventure in my '07 GT convertible. The car has the 6 CD radio and XM that goes to preview when I select it from the band button (actually XM1 & XM2). I have no intention of using Sirius or XM so using Pandora, or something similar on my EVO will fit my needs.
The work that
torridpsu did applies to any headphone output device so I decided to go that route. I didn't actually want to hack the original harness so I bought a PGHGM3 harness from
sonicelectonix.com for about $16 w/ shipping. Then a trip over to R'Shack, I picked up a 2 pack 1/8" panel jack for $3 (#274-249) and some heat shrink tubing for $6 (#278-1627).
The harness came in and I looked at what I needed to strip out of it. Essentially unwrap the whole thing and pull the wiring apart so you can follow them. The 12 pin plug & jack are all you need. I removed the 3 pins from the XM radio side of the harness and cut the other 3 wires at the adapter box end of the harness. All that is left is the unused brown wires and the 3 wires that go back to the radio side of the 12 pin jack.
(Unused parts on the left, good stuff on the right)
Next, to figure out which wire goes to which pin I did some searching and testing and found that on the PGHGM3 harness (from this vendor) the grey wire is the right channel, the white wire is the left channel, and the black w/white stripe is the ground. On the panel jack the tip is the left channel, the ring is the right channel and the sheild is the ground. As a note the factory color codes are green w/white for right, brown w/white for left, and the tan is the ground.
(Left - PGHGM3, right - Factory XM)
(Panel jack)
For reference I have these photos of the backside of the radio with and without the 12 pin connector.
Solder the wires to the jack (protect your console with a towel or something!) and use some shrink tubing to insulate the solder joints. Test your connections to the radio.
I mounted the jack in top panel of the console pocket. That way I can run the headphone cable out of there to my player or, if unplugged, it is unseen. I finished by taping the entire adapter harness.
I found the volume level is a bit low from the EVO to the radio. To adjust for this I run the EVO 1 click down from maximum and I set the EQ in the radio like a pre-amp, adjust the treb, mid, & bass up by 5 clicks each then adjust the sound preference from there. This gets the volume level close to the FM and CD.
Just wanted to give back, with help from this site I am enjoying my aux, enjoy yours!
-Jon
:beer: