I have a new 09 GS and can confirm that there is no AUX port wiring at the back of the radio. There is a 12 pin connector block but only 1 black lead is attached to pin 12 (Audio Ground).
However, I have managed to connect my Garmin Nuvi SatNav to the AUX Port and it works perfectly.
I used 3 x JST Male connectors – These connectors are commonly used in the Radio Controlled world for battery connection. The connectors have 2 sockets that fit the AUX pins perfectly – Search on Ebay for JST Male they’re about £1 each (COLOUR RED). I also used a stereo cable with a 3.5mm plug.
You need to remove the original 12 Pin connector block and cut the Black lead, this lead will be connected with a JST Plug.
JST Plug 1.
Remove the RED lead and join the BLACK lead to the Black lead cut from the 12 Pin connector block above. This plug will push onto pins 11 (no connection) and 12 (Audio Ground)
Cut the Stereo lead to an appropriate length and strip the wire - there will be 2 small leads for the left and right channels and the shielding wire for the AUX Screen
JST Plug 2.
Join the RED lead to one of the small Stereo leads and the BLACK lead to the other small Stereo lead. This plug will push onto pins 7 (Right AUX input) and 8 (Left AUX input)
JST Plug 3.
Remove the RED lead and join the BLACK lead to the Stereo lead shielding wire. This plug will push onto pins 6 (Aux Screen) and 5 (no connection)
Look carefully in the socket on the back of the head unit, pins 1,6,7 and 12 are identified.
I got your PM - But apparently, I can't send a PM to you until I have posted here a minimum of 5 times!
I have a Garmin Nuvi 765T SatNav and it does have a built-in speaker - However, in addition to navigation it also has an MP3 Player with SD Slot and Bluetooth for Phone connection. The MP3 player is CD quality an obviously sounds superior through the car stereo rather than the little Garmin speaker.
The MP3 music automatically mutes when navigation is announced or a phone call comes in. All of the sound is through the car stereo.
The 765T also has an FM Transmitter - The idea being the you set the output to say 88.1 and tune the car radio into 88.1 - The idea is brilliant but the quality is not great, but connection to the AUX Port is perfect.
It was a bit daunting pulling the dash apart on a new car - but, in my opinion, it's well worth the effort.
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