Factor Radio has 3 jacks, Adapter only has 2 (*Solved AUX Jack, Thanks CTScott)

[MJZ]

So I purchased a new head unit today (Pioneer DEH-X6700BT)
I've got the Metra dash kit
I Purchased the Scosche TA02B connector kit as recommended in the sticky
I pull the factory head unit out today and there are 3 connections, not 2 (the head actually has 4 inputs)

My big question/concern is... what is the 3rd connection for?

http://i.imgur.com/o22ckdcl.jpg

[CTScott]

The third connector is for the AUX jack.

[MJZ]

Jesus... what like 6 wires for 1 aux jack?
Crazy, But thank you for the reply... I was like WTF is this all about.

[dj92]

If I remember correctly, steering remote wires use this connector, too.
Or was it the mic prewiring?

[CTScott]

If I remember correctly, steering remote wires use this connector, too.
Or was it the mic prewiring?

Both steering wheel and mic do, but not on a US market 08.

[jack black]

a follow up question. I'm going to do the same HU. i assume there is no way to wire the stock AUX plug? i know there will be one in the HU's face, but it would be nice to have 2.