wooohooo!! I am finished with my OEM nav completely (except for one connector that is not really needed, and the VSE sub)
Installed the aux input from a Toyota Sienna today. Part number 86190-AE010 ($28)
Here is what the Sienna part looks like, you have to take it completely apart. I then removed the grey connector on it so I had bare pins to solder wires to. (this picture is from siennaclub.org)
Then I ordered the pins from mouser.com for the end that hooks up to the headunit (I am missing the connector for the pins,so I just put heat shrink on them and inserted them into the corresponding pins)
The most difficult part was putting the aux port in the dash knockout, I am a perfectionist so it had to look good
I ended up taking a small drill bit from behind through the small circle thing, lol. Then I took a bigger bit and drilled from the front, this took out that circular post on the back.
The circuit board was too large to fit in properly so I CAREFULLY used a roto-zip with the sanding bit to make it narrower. I then had to slowly enlarge the hole to match the port, it's an odd size so I didn't have a drill bit that matched. Then I used epoxy to glue the circuit board in place, let that dry, then filled everything in with hot glue. Then it was just a matter of plugging it in
Here are the wiring diagrams/parts I used: (Thanks seany @ siennaclub.org for posting the first diagram for me!!) Comparing the 1st and 2nd pictures below: From AUX pin 2 connects to 2 on nav, pin 1 connects to 3, pin 3 connects to 5, pin 4 connects to 6. It's hard to explain but the pins on the AUX unit are numbered weird, if needed I can go back and get exactly how they are connected and post.
