I have the new 2008 WRX STI and found that the BLuetooth mic did not come with the car. SO I had the Dealer order the part. After 5 weeks it came in and I laughed once I saw it. $198 for a 3 wire connection with mic that mounts on stearing column. I looked at the instructions and pin outs. It connects up to the back of the radio to 3 pins and that is it.
So I returned and said no thanks. I went out and bought a $10.00 computer mic from Wal-Mart and $1.99 9 Pin Computer Female adapter from Radio Shack that you put together. I just needed it for the small female pin outs. Since the back of the radio has the Male Pins.
The connector on the back is the black one almost in the middle/center right..
next to the little white one. 5 Male Pins are in it.
The Mic has two wires (Positive & Negative) You need to splice a second Negative Ground off the Mics Original Ground. To make Two Ground and One Positive Mic Wire.
Look at the Subaru Bluetooth Connector picture and instruction pics above.
Looking at the back of the radio at the connector the pins go from left to right.
1 2 3 4 5
G OO G P
G = Ground O = Open P = Positive
I used the gold Pins from the Radio Shack connector on the ends of the Mic wires so that way they would slide over the Pins in the connector on the back of the radio since I did not have the actual connector to plug into the radio. I would rather make a cheap $12.00 connection then pay $198 for the actual Subaru Part.
Once you make these connections then the Bluetooth Phone options will show up on the radio.
I have setup my bluetooth phone and use it all the time now. I ran the Mic wire down the Driver side from the visor in the Window Column for the airbag. Just pop out the AIRBAG TAG and remove bolt. The cover comes right off.